design and development of a trochoidal mass separator at the berkeley gas-filled separator

Design and Development of a Trochoidal Mass Separator at the Berkeley Gas-filled

Separator

J.M. Gates, K.E. Gregorich, G.K. Pang,N.E. Esker and H. Nitsche

Lawrence Berkeley National Laboratory

11th International Conference on Nucleus-Nucleus CollisionsMay 29, 2012 San Antonio, TX

Outline

• Region of Interest• Berkeley Gas-filled Separator• Trochoidal Mass Separator

118

117

11628811588 ms

28711532 ms115

11428211361 ms

2841130.48 s

2831130.10 s

2781132 ms113

2771120.7 ms112

2781114 ms

2801113.59 s

2791110.17 s

27411115 ms

2721113 ms111

269110130 ms110 270110

3 ms27111012 ms

273110170 ms

2761090.72 s

27510910 ms

2741092.91 s

2661092 ms109 268109

25 ms2701093 ms

26910814 s

2681080.37 s

26710868 ms

2661084 ms

2651082 ms

26310823 ms

262108260 ms108 270108

23 s

2621070.10 s

26110712 ms

26010732 ms107 266107

1 s2651070.94 s

2641070.11 s

26710717 s

27010761 s

2721079.79 s

106 2591060.48 s

2611060.23 s

2631060.9 s

26510621 s

26410637 ms

26210621 ms

2601063.6 ms

2591050.5 s

2581054.4 s105 260105

1.5 s2611051.8 s

26210534 s

26310527 s

26710573.4 h

26810515.9 h

26610522 m

26710477 m

25810412 ms

2571044.0 s104 259104

3.0 s26010421 ms

2611042 s, 78

s

2851140.12 s

28111297 ms

2771105.7 ms

2731080.25 s

269106130 s

265104105 s

2771083 ms

103 25610328 s

2551023.1 m

25410110 m

25510127 m

25610178 m

2571015.52 h

2531003 d

256100158 m

25910258 m

260103180 s

2591036.3 s

2581021.2 ms

2571030.65 s

2581033.9 s

2561022.91 s

25710225 s102

101

100 2541003.2 h

25510020 h

257100100 d

25810151.5 d

26110339 m

262103216 m

2601020.11 s

25910196 m

258100370 ms

2591001.5 s

26010131.8 d

29011614 ms

2711084 s

2631048 s

2941181 ms

29311653 ms

29211618 ms

29111618 ms

2871140.45 s

2891142.70 s

2881140.80 s

2861140.12 s

2821120.8 ms

2841120.10 s

2831123.83 s

28511233.5 s

2751080.19 s

271106114 s

2811109.6 s

2791100.20 s

2661060.32 s

26710684 s

29311714 ms

2891150.22 s

2851135.5 s

28111126 s

29411778 ms

29011516 ms

28611320 s

2821110.51 s

2781097.7 s

2741070.9 m

27010523 h

2621040.19 s

Berkeley Gas-filled Separator (BGS)

M W A C

F ocal P lan eD etector

P u n ch th rou ghD etector

R u th er fordD etectors

Q u adru poleM agn et

G radien t-F ield

M agn et

F lat-F ieldD ipoleM agn et

Target

E V RT rajectory

B eamT rajectoryB eam G as-F il led

C h am ber


Positive:• High efficiency• Large suppression of beam and unwanted reaction products

M W A C

F ocal P lan eD etector

P u n ch th rou ghD etector

R u th er fordD etectors

Q u adru poleM agn et

G radien t-F ield

M agn et

F lat-F ieldD ipoleM agn et

Target

E V RT rajectory

B eamT rajectoryB eam G as-F il led

C h am ber


Negatives:• Large focal plane image• Poor mass resolution• High gamma background at focal plane

118

117

11628811588 ms

28711532 ms115

11428211361 ms

2841130.48 s

2831130.10 s

2781132 ms113

2771120.7 ms112

2781114 ms

2801113.59 s

2791110.17 s

27411115 ms

2721113 ms111

269110130 ms110 270110

3 ms27111012 ms

273110170 ms

2761090.72 s

27510910 ms

2741092.91 s

2661092 ms109 268109

25 ms2701093 ms

26910814 s

2681080.37 s

26710868 ms

2661084 ms

2651082 ms

26310823 ms

262108260 ms108 270108

23 s

2621070.10 s

26110712 ms

26010732 ms107 266107

1 s2651070.94 s

2641070.11 s

26710717 s

27010761 s

2721079.79 s

106 2591060.48 s

2611060.23 s

2631060.9 s

26510621 s

26410637 ms

26210621 ms

2601063.6 ms

2591050.5 s

2581054.4 s105 260105

1.5 s2611051.8 s

26210534 s

26310527 s

26710573.4 h

26810515.9 h

26610522 m

26710477 m

25810412 ms

2571044.0 s104 259104

3.0 s26010421 ms

2611042 s, 78

s

2851140.12 s

28111297 ms

2771105.7 ms

2731080.25 s

269106130 s

265104105 s

2771083 ms

103 25610328 s

2551023.1 m

25410110 m

25510127 m

25610178 m

2571015.52 h

2531003 d

256100158 m

25910258 m

260103180 s

2591036.3 s

2581021.2 ms

2571030.65 s

2581033.9 s

2561022.91 s

25710225 s102

101

100 2541003.2 h

25510020 h

257100100 d

25810151.5 d

26110339 m

262103216 m

2601020.11 s

25910196 m

258100370 ms

2591001.5 s

26010131.8 d

29011614 ms

2711084 s

2631048 s

2941181 ms

29311653 ms

29211618 ms

29111618 ms

2871140.45 s

2891142.70 s

2881140.80 s

2861140.12 s

2821120.8 ms

2841120.10 s

2831123.83 s

28511233.5 s

2751080.19 s

271106114 s

2811109.6 s

2791100.20 s

2661060.32 s

26710684 s

29311714 ms

2891150.22 s

2851135.5 s

28111126 s

29411778 ms

29011516 ms

28611320 s

2821110.51 s

2781097.7 s

2741070.9 m

27010523 h

2621040.19 s

Scheme

What we want to do:• Collect recoils at focal plane of BGS• Separate by mass• Transport low-background region

Space Available

6 ft

Cave 2 Beamline

BGS

Concrete Walls

Support Beams

ANLBuilt

Berk.Built

Scheme

BGS Window GasCatcher

RFQTrap 1

RFQTrap 2

Extr.Accel.

MassAnal.

Det.Box

What we want to do:• Collect recoils at focal plane of BGS• Separate by mass• Transport low-background region

> 2 μm metal foil with support grid

Window


RFQTrap 1

RFQTrap 2

Extr.Accel.

MassAnal.

Det.Box

He (0.1 -1 bar)He ~ 100 mbar

RF + DC

SHE ion retains +1 or +2 chargeCylindrical and conical sectionPitch > 0.5 mm, f ~ 1 MHzSHE ions swept out by gas flow

Gas Catcher


RFQTrap 1

RFQTrap 2

Extr.Accel.

MassAnal.

Det.Box

Match acceptance for mass analyzer

RFQ Trap


RFQTrap 1

RFQTrap 2

Extr.Accel.

MassAnal.

Det.Box

Mass Analyzer: Requirements

• Fit at least 6 masses on C3

• Ability to determine implantation time• High dispersion • M/DM of >500 • High efficiency• Low extraction voltage from RFQ• Fit within existing space


RFQTrap 1

RFQTrap 2

Extr.Accel.

MassAnal.

Det.Box

Mass Analyzer: The Idea

Typical mass separators• Wien filter• TOF• 90-180° Magnet

Trochoid Separator - FIONA


RFQTrap 1

RFQTrap 2

Extr.Accel.

MassAnal.

Det.Box



RFQTrap 1

RFQTrap 2

Extr.Accel.

MassAnal.

Det.Box



RFQTrap 1

RFQTrap 2

Extr.Accel.

MassAnal.

Det.Box

Ratio of Ewien/Etroc

FIONA: Simulations

Det.Box

A=300301302303304


RFQTrap 1

RFQTrap 2

Extr.Accel.

MassAnal.

Einzel Lens

Magnet 1.5 T x

Electrode: 50 x 20 cm, 500 V/cm

+V

-V

A = 300-304Vacc = 4 kVQ = 2+

What it looks like on the FPD


RFQTrap 1

RFQTrap 2

Extr.Accel.

MassAnal.

Det.Box

A=300301302303304

FIONA: Simulations

Det.Box

A=300301302303304


RFQTrap 1

RFQTrap 2

Extr.Accel.

MassAnal.

Einzel Lens

Magnet 1.5 T x


+V

-V

A = 300-305Vacc = 4000 kVQ = 2+

How to get time information


RFQTrap 1

RFQTrap 2

Extr.Accel.

MassAnal.

Det.Box

A=300301302303304

Facility Layout

6 ft

Cave 2 Beamline

BGS

Concrete Walls

Support Beams

Mass Analyzer: Requirements

• Fit at least 6 masses on C3

• Ability to determine implantation time• High dispersion • M/DM of >500 • High efficiency• Low extraction voltage from RFQ• Fit within existing space


RFQTrap 1

RFQTrap 2

Extr.Accel.

MassAnal.

Det.Box

Status and Future

• Currently building little-FIONA–0.55 T magnet–Xe ion source–MCP detector

FIONA: Simulations


RFQTrap 1

RFQTrap 2

Extr.Accel.

MassAnal.

Det.Box

Einzel Lens


+V

-V

Magnet 0.5 T x

A=130131132133134A = 130-134

Vacc = 1 kVQ = 1+

What it looks like on the FPD


RFQTrap 1

RFQTrap 2

Extr.Accel.

MassAnal.

Det.Box

coun

ts p

er m

m

0

200

400

600

800

1,000

1,200

1,400

Position (mm)500 600 700

130131132133134

Status and Future

• Currently building little-FIONA–Xe ion source–0.55 T magnet–MCP detector

• All parts have been ordered/designed• Testing and construction will begin in June

Thank For Your Attention

design and development of a trochoidal mass separator at the berkeley gas-filled separator

Documents

separator bgs berkeley

separator bgsnegatives

separator bgspositive

s26010421 ms2611042

s27510910 ms2741092

d26110339 m262103216

h25510020 h257100100

s25710225 s1021011002541003