information contained herein is not subject to export control ......stable geocentric orbit (em l3,...

58
LAGRANGE LAser GRavitational-wave ANtenna at GEo-lunar L3, L4 , L5 John W. Conklin for the LAGRANGE team Information contained herein is not subject to Export Control or ITAR

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Page 1: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

LAG

RA

NG

ELA

ser

GR

avit

atio

nal-w

ave

AN

tenn

aat

GE

o-lu

nar

L3, L

4 , L

5

John

W. C

onkl

info

r th

e LA

GR

AN

GE

tea

m

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Page 2: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

LAG

RA

NG

E, 2

0 D

ecem

ber

2011

2

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

The

SALK

S C

olla

bora

tion

Sta

nfor

dN

ASA

AR

CL o

ckhe

ed

Mar

tinK

AC

ST o

fSa

udi A

rabi

aS

RI

Inte

rnat

iona

lsc

ienc

epa

yloa

d le

ad

(GR

S / I

MS)

scie

nce

orbi

t, or

b. in

ject

ion,

pr

op. m

od.

tele

scop

e,

spac

ecra

ftsc

ienc

e pa

yloa

d,

tech

dev

elop

men

tμN

thru

ster

s

John

Con

klin

Kar

thik

Bal

akris

hnan

Chi

n Sa

n H

an

BJ

Jaro

uxG

opal

Vasu

deva

nVi

ctor

Agu

ero

Page 3: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

LAG

RA

NG

E, 2

0 D

ecem

ber

2011

3

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Des

ign

Ove

rvie

w•

3 id

entic

al d

rag-

free

spa

cecr

aft &

pay

load

s

•St

able

geo

cent

ric o

rbit

(EM

L3,

L4,

L5)

•67

0,00

0 km

equ

ilate

ral t

riang

le (6

link

s)

•M

inim

um c

ompl

exity

•1

sphe

rical

TM

per

S/C

•1

lase

r & b

ench

per

S/C

•2

tele

scop

es, i

n-fie

ld p

oint

ing

•7

DoF

cont

rol p

er s

pace

craf

t

•Fl

ight

pro

ven

tech

with

hig

h TR

L(H

oney

wel

l gyr

o, D

ISC

OS,

GP-

B, L

ISA

)

•C

ontin

uous

, sim

ulta

neou

s, fa

st c

omm

•Fi

xed

ante

nnas

on

each

S/C

•M

bps

thro

ugh

NA

SA G

N (1

1 m

cla

ss),

~1 h

our d

ata

late

ncy

•C

ritic

al fo

r mis

sion

suc

cess

(GP-

B, L

IGO

)

•5

year

mis

sion

life

time

Page 4: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

LAG

RA

NG

E, 2

0 D

ecem

ber

2011

4

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Prin

cipa

l Cos

t Sa

ving

s R

elat

ive

to L

ISA

1.R

educ

ed S

/C m

ass

from

redu

ced

payl

oad

com

pone

nts

•1

GR

S, 1

Las

er, 1

opt

ics

benc

h, s

mal

ler (

20 c

m) t

eles

cope

s•

2 La

sers

bud

gete

d fo

r red

unda

ncy

(4 in

LIS

A)

•N

o cr

edib

le T

M fa

ilure

mec

hani

sm•

TM s

ensi

ng, c

harg

e co

ntro

l, sp

in-u

p, a

nd d

rag-

free

hav

e re

dund

ancy

•La

unch

mas

s sa

ving

s: ~

150

kg ×

3 sp

acec

raft

2.O

rbit

chan

ge: G

eoce

ntric

, 667

,000

km

arm

leng

th•

Req

uire

s 1

smal

l pro

puls

ion

mod

ule

inst

ead

of 3

•La

unch

mas

s sa

ving

s: ~

2,5

00 k

g

•R

educ

ed o

pera

tions

& c

omm

unic

atio

ns c

ompl

exity

•LA

GR

AN

GE

wet

laun

ch m

ass:

~2,

000

kg (~

5,00

0 kg

for L

ISA

)•

His

toric

tren

ds s

how

cos

t sca

les

with

mas

s

•Sa

ve ~

$150

M in

laun

ch a

lone

Page 5: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

LAG

RA

NG

E St

rain

Sen

siti

vity

•A

rm le

ngth

: 670

,000

km

•M

etro

logy

: 8 p

m/H

z1/2

at 3

mH

z(s

ee A

PPEN

DIX

D)

•A

ccel

erat

ion

nois

e: 3×1

0–15

m/s

ec2

•M

ust b

e ov

er-d

esig

ned

•Se

nsiti

vity

2x

less

than

LISA

bel

ow 2

0 m

Hz

•B

elow

2 m

Hz

gala

ctic

bina

ry c

onfu

sion

set

s lim

it

•LA

GR

AN

GE

mai

ntai

nsm

ost i

mpo

rtan

t sci

ence

obje

ctiv

es o

f LIS

A

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Page 6: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

LAG

RA

NG

E, 2

0 D

ecem

ber

2011

6

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Orb

it S

elec

tion

•C

omm

unic

atio

ns (&

cos

t) dr

ives

dec

isio

n fo

r geo

cent

ric o

rbit

•~

3 st

able

, nea

r-Ea

rth

orbi

ts fo

und

1.H

igh

retr

ogra

de: ~

600,

000

km fr

om E

arth

(Hel

lings

, OM

EGA

199

8)

2.Ea

rth-

moo

n L3

, L4,

L5:

384

,000

km

from

Ear

th (L

AG

RA

NG

E)

3.Ea

rth-

Sun

L2 c

ircul

ar H

alo:

~1.

5 M

kmfr

om E

arth

(mus

t be

chec

ked)

•1.

& 2

. hav

e si

mila

r per

form

ance

(ran

ge ra

te, b

reat

hing

, etc

.)

•EM

L3,

L4,

L5

chos

en b

ecau

se:

•C

lose

st to

Ear

th

•M

inim

um c

ruis

e tim

e

•La

unch

to W

eak

Stab

ility

Bou

ndar

y: 4

mon

ths

with

∆v

= 58

0 m

/sec

•La

unch

to T

rans

-Lun

ar In

ject

ion:

7 m

onth

s w

ith∆

v =

475

m/s

ec

Page 7: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

LAG

RA

NG

E, 2

0 D

ecem

ber

2011

7

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Orb

it P

erfo

rman

ce S

umm

ary

•In

itial

con

ditio

ns m

axim

ize

time

each

S/C

rem

ains

at L

-poi

nt•

Stat

ion

keep

ing

ever

y 6-

12 m

onth

s (L

3)

•St

atio

n ke

epin

g ca

pabi

lity

reco

mm

ende

d fo

r any

orb

it

•3

S/C

sim

ulta

neou

s op

timiz

atio

n m

ay im

prov

e pe

rfor

man

ce•

e.g.

syn

chro

nous

per

iodi

c or

bits

EM L

3,L4

,L5

LISA

Arm

leng

th0.

67 G

m5

Gm

∆ar

m le

ngth

≤5%

1%B

reat

hing

ang

le≤±5

deg

±0.5

deg

Ran

ge ra

te≤

150

m/s

ec10

m/s

ec∆

orbi

t pla

ne5

deg

60 d

eg

(see

AP

PE

ND

IX B

)

Page 8: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

LAG

RA

NG

E, 2

0 D

ecem

ber

2011

8

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Inte

rfer

omet

ric

Mea

sure

men

t Sy

stem

•IM

S fo

llow

s LI

SA s

chem

e w

ith s

ome

diffe

renc

es

•1

W N

d:YA

G(1

064

nm),

split

to fe

ed b

oth

arm

s

•Sp

lit in

terf

erom

etry

: lon

g-ar

m /

shor

t-arm

inte

rfer

omet

ers

•Sh

ort-a

rm (T

M to

opt

ics

benc

h): M

iche

lson

or g

ravi

ty F

abry

-Pér

otca

vity

•Lo

ng-a

rm (o

ptic

s be

nch

to re

mot

e op

tics

benc

h): l

ocal

& re

ceiv

ed la

ser p

hase

di

ffere

nce

(PB

S or

diff

ract

ion

grat

ing)

•La

ser p

re-s

tabi

lizat

ion

by o

ptic

al c

avity

or i

odin

e ce

ll

•Si

ngle

TM

requ

ires

no b

ack-

link→

4 ph

ase

mea

sure

men

ts (6

for L

ISA

)

•15

0 M

Hz

Dop

pler

freq

uenc

y

•R

equi

res

mod

ified

LIS

A p

hase

met

er

•A

ltern

ate:

freq

uenc

y sh

ift lo

w-p

ower

loca

l bea

m w

ith A

OM

(or E

OM

)•

Req

uire

s cl

ock

with

~10

–14

accu

racy

(e.g

. spa

ce q

ualif

ied

H m

aser

)

•6 μr

adpo

int-a

head

ang

le: L

ISA

PA

AM

(TR

L 4)

Page 9: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

LAG

RA

NG

E, 2

0 D

ecem

ber

2011

9

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

LISA

-like

Opt

ical

Ben

ch

Poss

ibly

re

plac

e w

ith

grat

ing

Page 10: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

Inte

rfer

omet

ryw

ith

a D

iffra

ctio

n G

rati

ng•

Dou

ble

side

d di

ffrac

tion

grat

ing

on lo

w C

TE m

ater

ial

•Sm

all,

~ m

m re

lay

regi

on b

etw

een

long

& s

hort

arm

inte

rfer

omet

ers

•C

TE <

dn/

dT

•Fe

wer

com

pone

nts →

smal

ler o

ptic

s be

nch

•Se

nsiti

vity

to g

ratin

g m

otio

n: 1

μcy

cle/

pm (s

imila

r to

LISA

req.

)

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Page 11: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

LAG

RA

NG

E, 2

0 D

ecem

ber

2011

11

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Tele

scop

e D

esig

n•

20 c

m a

pert

ure

•±2

.5 d

eg b

eam

ste

erin

g

•5

pm p

ath-

leng

th s

tabi

lity

•C

ompo

site

met

erin

g st

ruct

ure

•O

ff-ax

is, 2

-sta

ge d

esig

n

•St

age

one

is 6

:1 3

-mirr

orA

nast

igm

at

•Le

ads

to ±

15 d

eg s

teer

ing

mirr

or n

ear e

xit p

upil

•m

Kte

mpe

ratu

re c

ontr

ol

•O

ff-ax

is T

MA

TR

L9

•m

Kte

mp

cont

rol,

low

CTE

com

posi

te, p

m p

ath

leng

th c

ombo

TR

L 4

Stag

e O

ne D

esig

n

Page 12: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

LAG

RA

NG

E, 2

0 D

ecem

ber

2011

12

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Adv

anta

ges

of a

Sph

eric

al G

RS

1.N

o TM

forc

ing

or to

rqui

ng•

Nei

ther

ele

ctro

stat

ic s

uppo

rt n

or c

apac

itive

sen

sing

requ

ired,

redu

cing

di

stur

banc

es &

com

plex

ity

2.La

rge

gap

(35

mm

)•

Dis

turb

ance

s re

duce

d an

d/or

spa

cecr

aft r

equi

rem

ents

rela

xed

3.A

long

flig

ht h

erita

ge•

Hon

eyw

ell g

yros

, Tria

d I (

5×10

–11

m/s

ec2 ),

GP-

B (4

×10–1

1m

/sec

2 H

z1/2 )

4.Sc

alab

ility

•Pe

rfor

man

ce c

an b

e sc

aled

up

or d

own

by a

djus

ting

TM a

nd g

ap s

ize

5.Si

mpl

icity

•N

o cr

oss

coup

ling

of d

egre

es o

f fre

edom

6.Si

mpl

e fli

ght-p

rove

n ca

ging

mec

hani

sm (D

ISC

OS)

Page 13: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

LAG

RA

NG

E, 2

0 D

ecem

ber

2011

13

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Mod

ular

Gra

vita

tion

al R

efer

ence

Sen

sor

Page 14: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

LAG

RA

NG

E, 2

0 D

ecem

ber

2011

14

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

LAG

RA

NG

E Te

st M

ass

•Te

st m

ass:

70%

/30%

Au/

Pt (L

ISA

)•

Alte

rnat

e: B

ergl

ide

(2%

/97.

5%/0

.5%

Be/

Cu/

Co)

•Sp

inni

ng (3

-10

Hz)

ave

rage

all

but

axis

ymm

etric

irreg

ular

ities

•O

ut-o

f-pla

ne m

otio

n →

patc

h le

ngth

cha

nges

1 pm

/Hz1/

2at

1 m

Hz

(see

APP

END

IX E

)

•H

ollo

wed

out

sec

tions

(∆I/I

= 0.

1)sh

iftpo

lhod

eto

0.3

-1 H

z (A

PPEN

DIX

E)

•M

C d

eter

min

ed to

IFO

lim

it by

not

chin

g sp

in +

har

mon

ics

•C

arbi

de c

oate

d (e

.g. S

iC, Z

rC)

•H

ard

(no

stic

king

), re

flect

ive,

con

duct

ive,

allo

ws

UV

char

ge c

ontr

ol,

mea

sure

d pa

tche

s co

nsis

tent

or b

ette

r tha

n go

ld (A

PPEN

DIX

E)

r

0.2 r

20°

0.2

r

I 3

Opt

imal

geo

met

ry

Page 15: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

LAG

RA

NG

E, 2

0 D

ecem

ber

2011

15

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Mic

rone

wto

nTh

rust

ers

•D

rag-

free

& a

ttitu

de v

ia μ

N th

rust

ers

•N

o ex

istin

g th

rust

er m

eets

LIS

A n

oise

,m

ax th

rust

and

life

time

requ

irem

ents

•N

GO

eva

luat

ing

alte

rnat

es to

FEE

Ps

•SR

I mic

ro-fa

bric

ated

ion

thru

ster

attr

activ

e al

tern

ate

to B

usek

CM

NT

or It

alia

n/A

ustr

ian

FEEP

s•

Mic

ro-fa

bric

ated

em

issi

on s

ites

prod

uce

ions

& e

lect

rons

•“D

igita

l pro

puls

ion”

: 100

’s –

1,00

0’s

of in

depe

nden

t em

itter

s / c

m2

•Si

ngle

uni

t can

pro

duce

forc

es +

torq

ues

•H

uge

dyna

mic

rang

e: io

n pr

oduc

tion

phys

ics

unch

ange

d ov

er 1

0–9to

1 N

•U

p to

10,

000

sec

Isp

•Pr

otot

ype:

1 n

Nto

5 μ

N th

rust

er io

n so

urce

test

ed to

40

hr o

f ope

ratio

n

•C

an b

e de

mon

stra

ted

on a

1U

Cub

eSat

Page 16: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

Acc

eler

atio

n N

oise

Bud

get

•70

mm

dia

mA

uPts

pher

e, 3

5 m

m g

ap•

Man

y te

rms ∝

gap–1

, gap

–2

•R

equi

rem

ents

rela

xed

w.r.

t. LI

SA

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Page 17: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

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RA

NG

E, 2

0 D

ecem

ber

2011

17

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Spac

ecra

ft &

Mis

sion

Des

ign

•S/

C b

ased

on

exis

ting

LM S

/C, T

RL

>6•

~3 m

×0.

7 m

, 300

kg,

500

W

•Fi

xed

10 W

ant

enna

bet

wee

n te

lesc

opes

•Th

erm

al d

esig

n: G

RS

10 μ

K a

t 1 m

Hz

•±5

0 K

at e

xter

ior a

t 27.

3 pe

riod

•Th

erm

al lo

ad ra

diat

ed to

p/bo

ttom

•Pa

yloa

d at

cen

ter

•La

unch

mas

s: 2

,070

kg

•4-

7 m

onth

cru

ise

•5

year

life

time

•$9

50M

FY1

2

Page 18: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

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NG

E, 2

0 D

ecem

ber

2011

18

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

1st Te

ch D

emo

on n

ano/

mic

ro S

ats:

UV

LED

Sat

•St

anfo

rd: P

aylo

ad

•16

UV

LED

s(4

diff

eren

t typ

es)

•El

ectr

omet

er

•B

ias

plat

es

•A

ctiv

e ac

cha

rge

cont

rol

•N

ASA

AR

C:

•Sy

stem

s en

gine

erin

g,in

tegr

atio

n &

test

ing

•K

AC

ST:

•S/

C b

us, l

aunc

h, o

ps

•Fl

ight

pay

load

: Mar

. 201

2

•La

unch

: 201

3

Low

cos

t, ~2

yr →

TRL

9

Page 19: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

Engi

neer

ing

Uni

t

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Page 20: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

LAG

RA

NG

E, 2

0 D

ecem

ber

2011

20

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Res

pons

es t

o Q

uest

ions

(1/5

)1.

The

max

imum

one

-way

Dop

pler

is ~

150

MH

z, m

akin

g th

e ro

und

trip

~30

0 M

Hz.

H

ow d

o yo

u pl

an to

han

dle

this

?

Phas

e at

rem

ote

S/C

not

nec

essa

rily

re-

tran

smitt

ed. H

eter

odyn

e on

bot

hS/

C ~

150

MH

z. P

hase

met

erm

od o

r fr

eque

ncy

shift

loca

l las

er.

2.LI

SA re

quire

s a

fairl

y so

phis

ticat

ed

cloc

k no

ise

corr

ectio

n sy

stem

. To

mee

t yo

ur le

ngth

sen

sing

requ

irem

ents

with

th

ese

Dop

pler

freq

uenc

ies,

this

wou

ld

have

to b

e re

scal

ed. D

id y

ou lo

ok in

to

this

?

Yes,

it is

in o

ur b

udge

t. R

esid

ual c

lock

no

ise ∝

Dop

pler

freq

uenc

y.

LAG

RA

NG

E D

oppl

er is

10x

LIS

A.

Red

uced

sho

t noi

se h

elps

a b

it.

LAG

RA

NG

E cl

ock

nois

e =

3 pm

/Hz–

1/2

at 3

mH

z(L

ISA

~ 0

.4 p

m/H

z–1/

2 )

3.H

ave

you

look

ed a

t pat

h le

ngth

sta

bilit

y of

the

tele

scop

e?Ye

s, L

M a

naly

zed

path

leng

th s

tabi

lity

w.r.

t. te

mpe

ratu

re c

hang

e &

ste

erin

g.

4.D

oes

the

tele

scop

e ne

ed a

focu

s m

echa

nism

to c

ompe

nsat

e fo

r de-

wat

erin

g of

the

com

posi

te m

eter

ing

stru

ctur

e?

Yes.

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ber

2011

21

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Res

pons

es t

o Q

uest

ions

(2/5

)

5.Th

e an

gula

r var

iatio

ns a

re +

/-5

deg

betw

een

S/C

. The

tele

scop

e re

duce

s th

e be

am s

ize

by

a fa

ctor

of 6

but

als

o in

crea

ses

the

angu

lar

varia

tions

by

a fa

ctor

of 6

, req

uirin

g +/

-30

deg

of a

ngul

ar a

ctua

tion.

Are

you

pro

posi

ng to

us

e 2

mirr

ors

actu

atin

g by

+/-

15 d

eg to

co

rrec

t for

this

?

Tele

scop

e ra

nge

is ±

2.5

deg,

and

st

eerin

g is

han

dled

by

a si

ngle

m

irror

. (se

e C

hart

11)

6.D

o th

e te

lesc

ope

and

in-fi

eld

guid

ing

syst

em

requ

ire a

n ad

ditio

nal i

nter

fero

met

er to

read

ou

t the

ir le

ngth

cha

nges

?

Met

erin

g st

ruct

ure

tem

pera

ture

co

ntro

lled

to m

Kle

vel,

and

OPD

ca

libra

ted

as a

func

tion

of fi

eld,

al

low

ing

one

to o

pera

te w

ithou

t ac

tivel

y tr

acki

ng O

PD a

t pm

le

vel.

Inte

rnal

mon

itorin

g sy

stem

cou

ld b

e us

ed, b

ut a

t th

e co

st o

f add

ition

al p

ower

, w

eigh

t, co

st, c

ompl

exity

.

Page 22: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

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RA

NG

E, 2

0 D

ecem

ber

2011

22

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Res

pons

es t

o Q

uest

ions

(3/5

)

7.Ty

pica

lly a

mea

sure

men

t tel

esco

pe is

so

mew

hat d

iffer

ent f

rom

an

imag

ing

tele

scop

e. Y

ou'v

e id

entif

ied

a Th

ree

Mirr

or

Ana

stig

mat

with

flig

ht h

erita

ge, b

ut d

o yo

u ha

ve te

sts

to s

how

that

it m

eets

the

optic

al

path

leng

thre

quire

men

ts a

nd a

ll ot

her

perf

orm

ance

and

env

ironm

enta

l req

uire

men

ts

at T

RL

9?

Off-

axis

TM

A is

TR

L 9.

mK

tem

p co

ntro

l, lo

w C

TE c

ompo

site

te

lesc

ope,

pm

pat

h le

ngth

m

onito

ring

have

flig

ht

qual

ifica

tion

test

her

itage

. C

ombi

natio

n of

all

thre

e is

new

an

d is

con

side

red

TRL

4.(s

ee A

PPEN

DIX

A)

8.C

an y

ou c

omm

ent h

ow y

ou e

nvis

ion

that

the

typi

cal m

illira

dian

stee

ring

rang

e of

AO

Ms

and

EOM

s ca

n be

incr

ease

d to

the

requ

ired

leve

ls?

Ref

eren

ce 5

5 st

ates

that

max

imum

de

flect

ion

angl

es o

f 0.1

° are

pos

sibl

e us

ing

375V

in a

n 11

cm lo

ng a

nd 2

mm

wid

e cr

ysta

l.

Not

bas

elin

e de

sign

. C

omm

erci

ally

ava

ilabl

e pr

oduc

ts h

ave

larg

er ra

nge,

but

m

ay s

till n

eed

mag

nific

aito

n.

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2011

23

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Res

pons

es t

o Q

uest

ions

(4/5

)

9.Th

e gr

atin

g re

adou

t will

be

very

sen

sitiv

e to

an

gula

r mot

ion

and

late

ral d

ispl

acem

ent o

f th

e gr

atin

g. S

ee P

RL

95, 0

1390

1 (2

005)

for a

m

easu

rem

ent o

f how

the

inte

rfer

omet

ricsi

gnal

in a

Mic

hels

on in

terf

erom

eter

cha

nges

w

hen

the

grat

ing

is tr

ansl

ated

. Did

you

co

nsid

er th

is in

you

r ana

lysi

s?

Sens

itivi

ty to

spo

t mot

ion

over

gr

atin

g su

rfac

e is

1 μ

cycl

e/pm

, eq

uiva

lent

to L

ISA

opt

ical

be

nch

defo

rmat

ion

requ

irem

ents

. Affe

ct o

f sph

ere’

s m

otio

n w

.r.t.

Littr

owca

vity

mus

t be

ana

lyze

d in

det

ail.

10.

A s

pher

ical

met

allic

pro

of m

ass

has

had

figur

e/C

G is

sues

in th

e pa

st. H

ave

thes

e be

en

reso

lved

?

Path

-leng

th c

hang

es d

ue to

sp

here

form

/MC

~ 1

pm

.Se

e ch

art 1

4, A

PPEN

DIX

E.

11.

Are

the

prop

osed

car

bide

coa

tings

con

sist

ent

with

the

expe

cted

sur

face

and

pat

ch fi

eld

requ

irem

ents

?

Yes,

40%

bet

ter t

han

gold

whe

n cl

ean.

How

ever

, mea

sure

men

ts

show

pat

ches

dom

inat

ed b

y co

ntam

inat

ion.

See

char

t 14,

APP

END

IX E

.

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24

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Res

pons

es t

o Q

uest

ions

(5/5

)12

.Th

e ki

netic

ene

rgy

of th

e pr

oof m

ass

is

take

n ou

t by

boun

cing

the

proo

f mas

s in

side

the

hous

ing

with

initi

ally

mm

/s

velo

citie

s. W

hat t

ests

hav

e be

en d

one

that

sho

w th

at th

is d

oes

not d

ent t

he

surf

aces

cre

atin

g pa

tche

s? T

he

shad

ow s

enso

rs, t

he g

ratin

g, a

nd th

e so

urce

s fo

r the

UV

light

will

hav

e to

be

pro

tect

ed fr

om im

pact

?

Onc

e re

leas

ed S

/C ‘c

atch

es u

p’ to

TM

. B

ounc

es n

eed

not b

e in

elas

tic. m

m/s

ec

boun

ces

sim

ilar t

o ca

refu

l han

dlin

gof

TM

pre

-laun

ch. E

last

ic li

mit

of

sphe

re’s

mat

eria

l is

not e

xcee

ded.

Any

re

sidu

al m

arks

ave

rage

d by

spi

n. P

atch

vo

ltage

s of

100

mV

in e

rror

bud

get,

boun

ding

any

pos

sibl

e pa

tche

s pr

oduc

ed o

n-or

bit.

13.

How

long

will

the

dam

ping

take

?C

aptu

re ti

me

only

func

tion

of re

leas

e ve

loci

ty a

nd m

ax th

rust

.C

aptu

re in

~1,

000

sec,

DIS

CO

S ~1

00 s

ec

14.

Hav

e yo

u lo

oked

at o

ther

con

stel

latio

n co

ncer

ns, l

ike

poin

t-ahe

ad v

aria

tions

? If

so, h

ow w

ill th

ey b

e ad

dres

sed?

Yes,

see

APP

END

IX B

15.

Expl

ain

the

crui

se p

hase

ste

ps in

mor

e de

tail.

See

APP

END

IX C

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25

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rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

APP

END

IX A

: Mis

sion

Con

cept

Det

ails

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NG

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0 D

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ber

2011

26

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

LAG

RA

NG

E / L

ISA

Com

pari

son

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RA

NG

E, 2

0 D

ecem

ber

2011

27

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Tech

nolo

gy R

eadi

ness

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NG

E, 2

0 D

ecem

ber

2011

28

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Spac

ecra

ft &

Pay

load

Mas

s &

Pow

er

Page 29: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

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RA

NG

E, 2

0 D

ecem

ber

2011

29

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

APP

END

IX B

: Sci

ence

Orb

it D

etai

ls

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NG

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2011

30

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rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Scie

nce

Orb

it: 3

65 d

ay s

olut

ion

-4-3

-2-1

01

23

4

x 10

5

-3-2-10123

x 10

5

x (k

m)

Ear

th-M

oon

rota

ting

fram

e ce

nter

ed a

t bar

ycen

ter

y (km)

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NG

E, 2

0 D

ecem

ber

2011

31

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Scie

nce

Orb

it: 3

65 d

ay s

olut

ion

-4

-3

-2

-1

0

1

2

3

4

x 10

5

-3

-2

-1

0

1

2

3

x 10

5

-4-2024

x 10

4

y (k

m)

x (k

m)

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NG

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ecem

ber

2011

32

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Rel

ativ

e A

rm L

engt

h C

hang

es

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NG

E, 2

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ecem

ber

2011

33

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Spac

ecra

ft-t

o-Sp

acec

raft

Ran

ge R

ates

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NG

E, 2

0 D

ecem

ber

2011

34

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Bre

athi

ng A

ngle

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NG

E, 2

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ecem

ber

2011

35

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Poin

t-ah

ead

Ang

le

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36

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rmat

ion

cont

aine

d he

rein

is n

ot s

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ct to

Exp

ort C

ontro

l orI

TAR

Sola

r &

Lun

ar E

clip

ses

•Ec

lipse

s ov

er 3

65 d

ays

•M

axim

um E

arth

ecl

ipse

leng

th: 4

hou

rs

•M

axim

um L

unar

(par

tial)

eclip

se le

ngth

: 3 h

ours

Num

ber o

f Ecl

ipse

sL3

L4L5

Part

ial

Eclip

se2

02

Tota

l Ec

lipse

32

4

Part

ial

Eclip

se2

20

Tota

l Ec

lipse

00

0

Luna

r Ec

lipse

Eart

h Ec

lipse

Page 37: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

LAG

RA

NG

E, 2

0 D

ecem

ber

2011

37

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

APP

END

IX C

: Orb

it In

ject

ion

Det

ails

Page 38: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

Orb

it In

ject

ion

Scen

ario

1: W

eak

Stab

ility

Bou

ndar

yA

.D

ay 0

: Lau

nch →

WSB

(C

3 =

0 km

2 /sec

2 )B

.D

ay 4

1: W

SB →

Luna

r sw

ingb

y(∆

V =

95 m

/s)

C.

Day

81:

Lun

ar s

win

gby→

phas

ing

orbi

t(∆

V =

83 m

/sec

)D

.D

ay 1

00:p

hasi

ng o

rbit →

EM L

5(∆

V =

42 m

/sec

)E.

Day

118

:Ren

dezv

ous

EM L

5(∆

V =

51 m

/sec

)F.

Day

137

:pha

sing

orb

it →

EM L

3(∆

V =

70 m

/sec

)G

.D

ay 1

56:R

ende

zvou

s EM

L3

(∆V

= 67

m/s

ec)

H.

Day

175

:pha

sing

orb

it →

EM L

4(∆

V =

57 m

/sec

)I.

Day

193

:Ren

dezv

ous

EM L

4(∆

V =

0 m

/sec

)•

TO

TA

L Δ

V: 4

75 m

/sec

(incl

udin

g 10

m/s

cour

se c

orre

ctio

ns)

•Ea

ch L

M s

pace

craf

t has

100

m/s

ec

prop

. sys

tem

for i

nser

tion

/ tip

-off

A

BA

ssum

ed

Laun

ch:

1 Ja

n 20

15

C, E

,G

, I

DFH

Req

uire

s 23

0 kg

bip

rop

fuel

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Page 39: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

Orb

it In

ject

ion

Scen

ario

2: T

rans

-Lun

ar In

ject

ion

A

B

C

A.

Day

0: L

aunc

h →

TLI (C

3 =

–1.7

km

2 /sec

2 )B

.D

ay 3

: Lun

ar s

win

gby→

phas

ing

orbi

t(∆

V =

283

m/s

ec)

C.

Day

25:

pha

sing

orb

it →

EM L

5(∆

V =

42 m

/sec

)D

.D

ay 4

0: R

ende

zvou

s EM

L5

(∆V

= 51

m/s

ec)

E.D

ay 5

9: p

hasi

ng o

rbit →

EM L

3(∆

V =

70 m

/sec

)F.

Day

78:

Ren

dezv

ous

EM L

3(∆

V =

67 m

/sec

)G

.D

ay 9

7: p

hasi

ng o

rbit →

EM L

4(∆

V =

57 m

/sec

)H

.D

ay 1

15: R

ende

zvou

s EM

L4

(∆V

= 0

m/s

ec)

•T

OT

AL Δ

V: 5

80 m

/sec

(incl

udin

g 10

m/s

cour

se c

orre

ctio

ns)

•Ea

ch L

M s

pace

craf

t has

100

m/s

ec p

rop.

sy

stem

for i

nser

tion

/ tip

-off

Req

uire

s 29

7 kg

bip

rop

fuel

D

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Page 40: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

LAG

RA

NG

E, 2

0 D

ecem

ber

2011

40

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

APP

END

IX D

: IM

S D

etai

ls

Page 41: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

LAG

RA

NG

E, 2

0 D

ecem

ber

2011

41

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Gra

ting

as

a B

eam

Spl

itte

r

Page 42: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

LAG

RA

NG

E, 2

0 D

ecem

ber

2011

42

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Gra

ting

-Sph

ere

Cav

ity

•M

ode

mat

chin

g an

d st

able

low

fine

sse

cavi

ty d

emon

stra

ted

Page 43: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

LAG

RA

NG

E, 2

0 D

ecem

ber

2011

43

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Phas

emet

er•

JPL

Phas

emet

er, b

ased

on

GPS

tech

(TR

L 5)

•A

ccom

mod

ate

150

MH

z he

tero

dyne

freq

uenc

y if

poss

ible

•A

ltern

ate:

freq

uenc

y sh

ift lo

cal l

aser

pic

k-of

f to

redu

ce h

eter

odyn

e fr

eq.

•A

OM

or E

OM

with

acc

urat

e sy

nthe

size

r

•~1

50 M

Hz

rang

e, μ

cycl

e ac

cura

cy →

requ

ires

H-m

aser

or e

quiv

alen

t clo

ck

•O

ne-w

ay li

ght t

rave

l tim

e: 2

.25

sec

•Po

int-a

head

ang

le: 6

±0.

5 μr

ad(s

ee A

PPEN

DIX

B)

•LI

SA P

oint

-Ahe

ad A

ngle

Mec

hani

sm s

uffic

ient

(TR

L 4)

•Pi

ezo-

actu

ated

flex

piv

ot m

irror

•80

0 μr

adra

nge,

16

nrad

/Hz1

/2an

gula

r jitt

er, 2

pm

/Hz1

/2pi

ston

jitte

r

Poin

t-ah

ead

Ang

le

Page 44: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

LAG

RA

NG

E, 2

0 D

ecem

ber

2011

44

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Met

rolo

gy E

rror

Bud

get

•N

oise

is fl

at a

bove

3 m

Hz

& 1

/f2

belo

w

•Sh

ot n

oise

redu

ced

w.r.

t. LI

SA d

ue to

sho

rter

arm

(20

cm te

l.)

•R

esid

ual c

lock

noi

se ~

10 la

rger

due

to la

rger

Dop

pler

rate

Noi

se s

ourc

eN

oise

at 3

mH

z(p

m/H

z1/2 )

Shot

noi

seO

ptic

al p

ath-

leng

th c

hang

es*

Res

idua

l clo

ck

nois

eR

esid

ual l

aser

ph

ase

nois

e3

Tota

l (R

SS)

4 5 3 8*D

omin

ated

by

tele

scop

e

Page 45: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

LAG

RA

NG

E, 2

0 D

ecem

ber

2011

45

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

APP

END

IX E

: MG

RS

Det

ails

Page 46: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

LAG

RA

NG

E, 2

0 D

ecem

ber

2011

46

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Test

Mas

s G

eom

etry

•TM

hol

low

ed o

ut•∆

I / I

> 0.

1 →

polh

ode

> 0.

3 -1

Hz

for s

pin

= 3

-10

Hz

•D

ensi

ty lo

ss <

20%

•Sy

mm

etric

→IM

S m

odul

atio

nis

sin

usoi

dal

•Ex

tern

al g

eom

etry

requ

irem

ents

•Sp

heric

al to

< 3

0 nm

•G

P-B

, Hon

eyw

ell r

otor

~ 1

0 nm

•M

ass

unba

lanc

e <

300

nm

•G

P-B

roto

r ~ 1

0 nm

r

0.2

r

20°

0.2

r

I 3

Opt

imal

Geo

met

ry

Page 47: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

Bra

ss T

M F

abri

cati

on D

emo

2-pa

rt s

pher

e (C

NC

)3-

part

sph

ere

(lath

e)

Torc

h br

aze

Lap

& p

olis

h

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Page 48: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

LAG

RA

NG

E, 2

0 D

ecem

ber

2011

48

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Path

Len

gth

Cha

nges

due

to

Geo

met

ry•

Lapp

ing

and

polis

hing

min

imiz

es s

lope

of s

urfa

ce•

Am

plitu

de o

f sha

pe h

arm

onic

s ∝

1 / s

patia

l siz

e (l)

•La

ser s

pot a

vera

ges

harm

onic

s <

1 m

m

•Sp

in a

vera

ges

all b

utax

isym

met

richa

rmon

ics

•O

ut-o

f-pla

ne m

otio

n→

patc

h le

ngth

cha

nges

•S/

C ji

tter <

3 μ

rad/

Hz1/

2

→<

1 pm

/Hz1/

2

•O

rbit:

5°/2

7.3

days

→1

pm/H

z1/2

at 1

mH

z

•LI

SA o

rbit:

60°

/1 y

ear

→10

pm

/Hz1/

2at

0.1

mH

z

Mea

sure

d G

P-B

rot

or

LAG

RA

NG

E T

M m

odel

Page 49: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

LAG

RA

NG

E, 2

0 D

ecem

ber

2011

49

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Test

Mas

s C

agin

g &

Rel

ease

•D

ISC

OS

fligh

t pro

ven

mec

hani

sm•

Jack

scr

ew h

olds

TM

aga

inst

hou

sing

•Su

cces

sful

ly d

emon

stra

ted

twic

e on

-or

bit,

2ndtim

e af

ter 6

mon

th c

agin

g

•A

fter r

elea

se, μ

N th

rust

ers

‘cat

ch u

p’w

ith in

ertia

l TM

•C

aptu

re ti

me

only

func

tion

ofre

sidu

al v

eloc

ity &

max

thru

st•

mm

/sec

bou

nces

~ h

andl

ing

on g

roun

d

•D

oes

not r

equi

re in

elas

tic c

ollis

ions

•D

ISC

OS

capt

ure

time:

~10

0 se

c•

On-

orbi

t cap

ture

mat

ched

sim

ulat

ions

•LA

GR

AN

GE:

~10

00 s

ec

DIS

CO

S

Page 50: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

LAG

RA

NG

E, 2

0 D

ecem

ber

2011

50

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Diff

eren

tial

Opt

ical

Sha

dow

Sen

sor

•nm

/Hz1

/2ac

cura

cy o

ver m

Hz-

1Hz,

~m

m d

ynam

ic ra

nge

•D

emon

stra

ted

to 2

nm

/Hz1

/2at

1 H

z, 2

0 nm

/Hz1

/2at

1 m

Hz

•Li

mite

d by

env

ironm

ent,

not t

he s

enso

r

DO

SS s

chem

eD

OSS

pro

toty

pe a

t Sta

nfor

d

Page 51: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

LAG

RA

NG

E, 2

0 D

ecem

ber

2011

51

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Test

Mas

s Sp

in-u

p C

oils

•B

ased

on

fligh

t pro

ven

Hon

eyw

ell G

yros

•6

Hel

mho

ltz-li

ke c

oils

•4

in o

rbit-

plan

e fo

r spi

n-up

(ac)

•2

top/

botto

m fo

r pol

hode

dam

ping

& s

pin

axis

alig

nmen

t (dc

)

•O

pen-

loop

sys

tem

(on/

off)

•Sp

in-u

p to

10

Hz

in fe

w h

ours

Hon

eyw

ell E

SG

LAG

RA

NG

E Sp

in-u

p C

oil

Page 52: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

LAG

RA

NG

E, 2

0 D

ecem

ber

2011

52

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

UV

LED

Cha

rge

Con

trol

•C

harg

e co

ntro

l by

UV

phot

oem

issi

on u

sing

254

nm

line

of a

n rf

mer

cury

sou

rce

succ

essf

ully

dem

onst

rate

d on

GP-

B

•LA

GR

AN

GE:

New

er c

omm

erci

al U

V LE

Ds

(240

-255

nm

)•

Fast

-sw

itcha

ble

(> 1

00 M

Hz)

allo

win

g ac

cha

rge

man

agem

ent t

hrou

gh

sync

hron

izat

ion

with

bia

s el

ectr

ode

•10

mW

→10

μW

at 2

52 n

m

•Pa

ssiv

e ch

arge

man

agem

ent p

ossi

ble

for L

AG

RA

NG

E•

Virt

ual w

ire b

etw

een

TM a

nd S

/C (~

5 pF

capa

cita

nce)

•Sp

ace

qual

ifica

tion

com

plet

e•

Life

time:

>5

year

s

•R

adia

tion

•Sh

ake,

bak

e, s

hock

Page 53: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

Test

Mas

s C

oati

ng•

Car

bide

com

pond

(e.g

. SiC

or Z

rC)

•H

ard,

con

duct

ive,

refle

ctiv

e, p

erm

its U

V ch

arge

con

trol

, mea

sure

d pa

tch

pote

ntia

ls s

imila

r to

gold

(see

APP

END

IX E

)

•C

arbi

des

appe

ar b

ette

r cho

ice

for t

est m

ass

coat

ing

•Pa

tche

s do

min

ated

by

cont

amin

atio

n

•Er

ror b

udge

t: pa

tche

s 10

0 m

V dc

, 100

μV/

Hz–1

/2(1

mH

z/ f

)[G

P-B

, Tre

nto]

Prop

erty

Au

Car

bide

sPa

tch

pote

ntia

ls in

10–

7Pa

afte

r bak

e-ou

t, 3

mm

tip

~ 10

mV

~ 6m

VPa

tch

pote

ntia

ls in

“re

gula

r env

ironm

ent”

(from

GP-

B, L

PF, C

asim

irfo

rce

exp.

, etc

)20

-80

mV

20-8

0 m

V

Har

dnes

sLo

wH

igh

“Stic

ktio

n”Lo

wH

igh

Opt

ical

refle

ctiv

ity (m

easu

red)

Hig

hH

igh

UV

Phot

oem

issi

on (e

lect

rons

/pho

ton

at 2

52 n

m)

3.4×

10–7

Au ×

(1.2

-1.9

)

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Page 54: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

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RA

NG

E, 2

0 D

ecem

ber

2011

54

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Coa

ting

s Te

sted

at

Stan

ford

Nb

MoC

Au

S

iC

TaC

ZrC

TiC

Nb

Page 55: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Kel

vin

Prob

e fo

r M

easu

rem

ents

of P

atch

Eff

ects

Page 56: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

Info

rmat

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estig

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ffect

with

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to S

T-7

and

LISA

N. A

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lClass. Q

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 Grav.23

(7) p

p. 266

5‐26

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06) h

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Page 57: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

Info

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LAG

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58

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