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Abstract The US Dep

Beams (FRIB)heavy ion supall ions up toMeV/u and beapproximatelyreduce the voachieve the finchallenging pr(approximatelyin the small considered is atest chamber tof different carbon, graphelectron beam stripper will studies are a neffect of radiatutilized heavy this issue. Werequirements a

An overview[1] in this confis due to the hFRIB will aapproximatelyto 40 kW. Takthe power depW. To reduce the angular scsmall spot sizeand the beam stripper is jusstripper beingstripper and a [2]. This papeexclusively.

The major cstresses and rato the carbonelectronic lossthese energiesat which the (8.1 MeV/u) aMeV/u). It can ____________________________* This material is Energy Office of SC0000661 #marti@nscl.msu.

A

FRIB, M

partment of En) at Michigan

perconducting o uranium witeam power up

y 16.5 MeV/u oltage needed nal energy. Throblem due toy 0.7 kW) in th

beam spot. a carbon foil sto study the thstripping me

hene, diamondto deposit powsee in operatinecessary condtion damage mions (Pb) from

e present in thand the status o

INTRODw of the FRIBference. The c

high energy losaccelerate. At 16.5 MeV/u,

king the examposited on the sthe emittance

cattering, it is e at the strippe

divergence adst one of the studied. A liplasma stripp

er describes th

concerns in theadiation damagn is shown ins is calculated,. The two curvexperiment deand the energyn be seen that t

________________

based upon work Science under Coo

edu

A CARBO

F. Marti#, Michigan St

nergy Facility fn State Univerlinac capable th energies hito 400 kW. A

we plan to strin the rest o

he design of tho the high pohe stripper medOne of the

stripper. We hahermal-mechandia candidate

d). This chambwers similar to ion. The therdition but not

must also be stum the K500 cychis paper a suof the studies.

DUCTION B accelerator challenge of thess of the very ht the strippinthe beam poweple of a solid cstripper is of thgrowth at the necessary to

er (the scatterindd in quadratualternative so

iquid lithium per are also behe R&D on the

ese conditions ge. The linear n Figure 1 w, being the doves correspondescribed later wy at the FRIBthere is a very

supported by the Doperative Agreeme

N FOIL S

S. Hitchcocktate Universi

for Rare Isotoprsity includes of accelerating

igher than 200At an energy orip the beam toof the linac tohe stripper is ower depositeddia by the beam

options beingave developed nical propertiees (amorphouber utilizes anwhat the FRIB

rmo-mechanicasufficient. Th

udied. We havclotron to studyummary of th

can be found ine FRIB strippeheavy ions thang energy oer will be closcarbon stripperhe order of 700stripper due tooperate with

ng from the foiure). The solidolutions to thstripper, a ga

eing considerede solid strippe

are the thermaenergy transfe

where only thominant term ad to the energywas performed

B stripper (16.5y large variation

Department of ent DE-

STRIPPER

k, O. K. Kesity, East Lan

e a g 0

of o o a d

m g a

es us n B al e e y

he

n er at of e r, 0 o a il d e

as d

er

al er he at y d 5 n

with atomuranium.

Figure 1:atomic nufor two dfor the exFRIB eneused in th

STRWith t

mechanicheating thby an elec

F

The mawas to otemperatucalculatedfor the car

R FOR FR

ster, J. C. Olinsing, MI 48

mic number, wi

: Electronic eumber in carb

different energixperiment at thergy at the strihe experiment.

RIPPER FOthe purpose al issues we

he stripper foilctron gun borro

Figure 2: Insid

ain objective oobtain confide

ure distributiod and we couldrbon foils.

RIB *

iva 824, U.S.A.

ith values reac

energy loss ason. The data hies. 8.1 MeV/uhe K500, and ipper. The arro

OIL TEST Cof studying

built a test chs with an electowed from GSI

e of the foil tes

of the experimence that the

on in the fod then predict

ching 25 keV/n

s a function ohas been calcuu is the energy

16.5 MeV/u ow indicates th

CHAMBERthe thermal

hamber that atron beam proI.

st chamber.

ment in the chae estimates ooil were corthe sublimatio

nm for

of the ulated y used is the

he ion

R l and allows duced

amber of the rrectly on rate

Proceedings of Linear Accelerator Conference LINAC2010, Tsukuba, Japan TUP105

03 Technology

3H Other Technology 659

tlmbuttZMac

aB

kv

w

e

S

dt

Faod

owhatcecmm

The electronthen interceptelocated behinmounted. A rotbetween the utilization of temperature intemperature is ZnSe viewporMIKRON M9and 3000 C icamera operatspectrum. The a Fibre Optic B&W TV cam

The FOS wknown tempeviewport and sensitivity. Thewere performespectrum betwemissivity that

Stationary BUsing a non

distribution in the transient he

Figure 3: Nagreement betwof the temperadependence du

Figure 3 sho

of the temperawith the measheating. Thereand low range the whole rangcalculations aemissivity wascamera. This match the measurement.

n beam is focued by the foils d the target tating vacuum different test

several diagnfra-red (IR) c

900 C) is locart. The other

9200 IR camerin four differetes in the shosize of this viSpectrometer

mera. was calibrated erature. This fibre transmise temperature ed by fitting

ween 400 andt is independen

Beam Test n-rotating beam

transverse spaeating process.

Non-rotating bween the calcuatures in the truring the heatin

ows good agreeature distributiosurement as a e are two curve

because the Mge of interest iand the measus set at 0.32 fovalue of the camera meas

used by an einto be tested. Awheel where feed-trough rofoils. Two p

gnostic instrumamera (FLIR Eated in one of t

larger port ira that operateent overlappinorter wavelengiewport allows(FOS) from S

with a calibrprocedure co

ssion as well determinationa black body

d 800 nm (thnt of the wavele

m we studied tace and the tim.

beam test, sulation and theransverse spacng of the foil.

ement betweenon as a functio

function of ties in the graph

MIKRON camein a single meaurements agreor the calculatemissivity is surements wi

nzel lens and iA Faraday cup i

the foils arotates the wheeorts allow thments. A lowE45, maximumthe ports with s used with

es between 900ng ranges. Thigth area of th sharing it withtellarNet and

ration lamp oorrects for thas the detectos with the FOSy curve to thhis assumes anength).

the temperaturme evolution o

showing goode measurementce and the tim

n the simulationon of radius andime during th

hs labelled highera cannot spanasurement. Th

ee but the foitions and in thalso needed toith the FOS

is is re el e

w m a a 0 is

he h a

of he or S e n

re of

d ts e

n d e h n e il e o S

RotatingThe ein

independethe electrmotion ofa stationaquadraturthe exit “g

Figure 4showing tshow thewaves in q

This confplan was foil to bstripper. Astripper in

Figure 5:MIKRONthe right temperatuon the hea

The temcalculate tsublimatio

The radK1200 CoThe beamK1200 anSeveral fostripper ca

After tumoved to at intensiintensity with a ctemperatuthe difficu

g Beam Testnzel lens thirdent electrodes. rodes to steerf the beam, to ary beam by are. Figure 4 shoground” electro

: Electrode cthe deflecting

e beam path oquadrature are

figuration is imto build a rot

better distributAlso RIKEN n some tests [3

The picture onN IR camera fo

graph showure showing thated circle.

mperature meathe thermal behon effects in FR

RADIATdiation damageoupled Cyclotrm from the Knd stripped at aoils from diffearrousel and teuning the beamthe stripping l

ities of 20, 5available. The

chopper operaure of the foilsult environmen

d electrode hasThis configurthe beam an

simulate a rotaapplying two sows the electroode.

configuration electrodes (lef

on the foil wapplied.

mportant becautating disk inste the heat ais using a ro].

n the right showor a beam rotat

ws the time dhe heating and

asurements conhaviour of the RIB.

TION DAMe effects were sron Facility (C

K500 is injectea radius of apperent origin wested with an 8m at low intenocation and the50 and 100%e average intenating at 2 kH is shown in Fnt where the st

s been split ination allows b

nd produce a rating disk in frsinusoidal wavode configurati

of the einzelft). On the rig

when two sinu

use the initial tead of a stati

and damage otating disk as

ws the output ting at 86 Hz, dependence ocooling for a

nfirmed that wfoils and predi

MAGE studied in the KCF) at NSCL/Med radially intproximately 0.ere mounted o.1 MeV/u beamnsity the foilse beam was str

% of the maxnsity was contHz. The calcuFigure 6. Notictripper is locat

n four iasing rotary ont of ves in ion of

l lens ght we soidal

FRIB ionary of the s their

of the while

of the point

we can ict the

K500-MSU. to the 33 m.

on the m. were ripped

ximum trolled ulated

ce that ted (in

TUP105 Proceedings of Linear Accelerator Conference LINAC2010, Tsukuba, Japan

660

03 Technology

3H Other Technology

vvir

Fdp

l

t

iod

Fff

vacuum, in a voltage acceleinstalling any rely on the calc

Figure 6: Calduring the Pbpower the temshould not be asimilar to declong time to ac

As shown into remove the p

The figure oions extracted of ions injectedifferent foils a

Figure 7: Percfunction of thefoils of differe

5 T magnetierating RF ediagnostics to culated temper

lculated tempeb experiment mperature is bean issue. The reasing the cuchieve equilibr

n the figure thpossibility of dof merit we cofrom the cycl

ed and hitting are shown in F

cent of ions exe dose of Pb iont origin.

ic field and inelectrode) prev

monitor the foratures.

erature of thein the K1200

elow 1100 K, effect of chopp

urrent to 20% rium.

he temperature damage by subonsidered was lotron divided

the foil. The Figure 7.

xtracted from tons hitting the

nside the highvents us fromoil, so we mus

e stripper foil0. Even at ful

so sublimationping at 2 kHz ibecause of th

is low enoughblimation.

the number oby the numberesults for th

the K1200 as stripper foil fo

h m st

ls ll n is e

h

of er e

a or

The grafoils fromthe accelethe cyclot

Most oand measthey becoeffect sephenomen[4].

The foMicroscopMSU.

Figure 8:(left) showexposed t

The “iocertain vatarget matarrow in operatingvalue for

The radPb beam iwhat has fast decaystripper vWe are c[2].

[1] R. C.Rare paper

[2] F. MFRIB

[3] H. HstrippInstru613 (

[4] A. Beand D

aph shows no m different origeration of intentron.

of the foil had surements withome thinner in eems consistenon described

ils were inspepe (SEM) at th

SEM photogwing a small o the Pb beam

on hammeringalue of the electerial and abovFigure 1 indi

. We did not ficarbon.

CONdiation damagein the K1200 cbeen describe

y of the foil very unlikely tconsequently lo

REF York et al, “SIsotope Beam

r at this conferearti et al., “De

B” TUP106 at tasebe et al., “Dper foils for uments and M(2010) 453. enyagoub and Defects in Sol

significant diffgins. The very nse very heavy

grown in the h an alpha sou

the region hitent with the

by Klaumunze

ected with an he Advance M

graphs of the pinhole for illon the right.

” effect seemsctronic dE/dx

ve a certain flueicates where tind any referen

NCLUSIONe observed in thcyclotron showed as “ion hamperformance

to satisfy the ooking at othe

FERENCESStatus and Planms at Michigan

ence evelopment of this conferenceDevelopment uranium ion

Methods in Ph

S. Klaumunzelids, 1993, vol

fference betweefast decrease mions not practi

transverse direurce confirmedt by the beam

“ion hammeer and collabo

Scanning EleMicroscopy Cen

unused carbonlustration and

s to appear abthat depends oence. The horizthe experimennce to this thre

N he foils expose

wed effects simmmering”. Themakes this tyFRIB requiremer options for

S ns for the Facilin State Univers

stripper optione. of long-life c

n beams”, Nuhysics Resear

er, Radiation El. 126, pp. 105

en the makes ical in

ection d that . This ering”

orators

ectron ntre at

n foil a foil

bove a on the zontal

nt was eshold

ed to a milar to

e very ype of ments. FRIB

ity for sity “,

ns for

arbon uclear rch A

Effects 5-110.

Proceedings of Linear Accelerator Conference LINAC2010, Tsukuba, Japan TUP105

03 Technology

3H Other Technology 661