CEBAF Energy Recovery Experiment Alex Bogacz for E0 2-1 0 2 - - PowerPoint PPT Presentation

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Feb 26, 2023 166 likes •348 views

CEBAF Energy Recovery Experiment Alex Bogacz for E0 2-1 0 2 Collaborat ion at J-Lab A. Magerl K. Beard A. Freyberger J. Bengt sson A. Guerra N. Merminga A. Bernhard R. Hicks T. Plawski A. Bogacz A. Hofler Y. Roblin C. But

SLIDE 1

APS April Meet ing, Philadelphia, PA, April 7, 20 0 3

CEBAF Energy Recovery Experiment

Alex Bogacz for E0 2-1 0 2 Collaborat ion at J-Lab

K. Beard
J. Bengt sson
A. Bernhard♦
A. Bogacz♣
C. But ler
Y. Chao
S. Chat t opadhyay
H. Dong
D. Douglas

♠College of W

illiam and Mary, W illiamsburg, VA, Graduat e st udent

♦Friedrich-Alexander Universit y of Erlangen-Nürnberg, Germany ∗Nat ional Inst it ut e of Advanced Indust rial Science and Technology, Tsukuba, Japan ♣co-spokesman

A. Magerl♦
N. Merminga
T. Plawski
Y. Roblin
M. Spat a
C. Tennant ♠
M. Tiefenback
H. Toyokawa∗
A. Freyberger
A. Guerra
R. Hicks
A. Hofler
C. Hovat er
A. Hut t on♣
R. Kazimi
R. Lauze

SLIDE 2

CEBAF Energy Recovery Experiment Alex Bogacz, et al

APS April Meet ing, Philadelphia, PA, April 7, 20 0 3

2 Overview Mot ivat ion, Fut ure accelerat ors based on ERLs (Energy Recovery Linacs) Experiment layout , Beam t ransport , Inst rument at ion Measurement s – charact erist ics of energy recovered beam

♠ Emit t ance, moment um spread ♠ Beam halo ♠ RF cavit y t ransient s

Preliminary result s (energy recovered beam at 56 MeV and 20 MeV) Summary

SLIDE 3

CEBAF Energy Recovery Experiment Alex Bogacz, et al

APS April Meet ing, Philadelphia, PA, April 7, 20 0 3

3 Energy recovery* − process by which t he energy invest ed in accelerat ing

a beam is ret urned t o t he rf cavit ies by decelerat ing t he same beam

W

hy Energy Recover?

♦ Required rf power becomes nearly independent of beam current ♦ Reduces elect ron beam power t o be disposed by rat io of Efin/Einj ♦ Alleviat es shielding, if beam dumped below t he neut ron product ion t hreshold ♦ Promises efficiencies of st orage rings, while maint aining beam qualit y of linacs:

superior emit t ance and energy spread, short bunches (sub-pico sec.) Fut ure Applicat ions:

♦ Free Elect ron Lasers ♦ Synchrot ron Light Sources ♦ Elect ron Cooling Devices ♦ Elect ron Ion Colliders

*Maury Tigner, Nuovo Ciment o 37 (1

96 5)

SLIDE 4

CEBAF Energy Recovery Experiment Alex Bogacz, et al

APS April Meet ing, Philadelphia, PA, April 7, 20 0 3

4 10 100 1000 10000 100 200 300

Average Current [mA] Energy [MeV]

ERL Landscape

Light Sources Elect r on-I on Colliders

eRHI C ELI C ERLSYN ERL 4GLS

1 kW FEL

10 kW FEL BNL Elect ron Cooling ERL P rot ot ype 100 kW FEL CEBAF-ER

High current pat h High energy pat h

10 100 1000 10000 100 200 300

Average Current [mA] Energy [MeV]

ERL Landscape

Light Sources Light Sources Elect r on-I on Colliders Elect r on-I on Colliders

eRHI C ELI C ERLSYN ERL 4GLS

1 kW FEL

10 kW FEL BNL Elect ron Cooling ERL P rot ot ype 100 kW FEL CEBAF-ER

High current pat h High energy pat h

SLIDE 5

CEBAF Energy Recovery Experiment Alex Bogacz, et al

APS April Meet ing, Philadelphia, PA, April 7, 20 0 3

5 Experiment Layout

♦ New hardware − a λ/2 chicane and a beam dump/chicane at t he end of t he Sout h

Linac. The beam is accelerat ed in t he Nort h Linac and Sout h Linac t hen

decelerat ed t hrough t he Nort h Linac and Sout h Linac. 56MeV 56MeV λ/2 phase delay chicane

1L21 2L21

56MeV 556MeV 556MeV 1056MeV 556MeV 1056MeV 56MeV 556MeV acceleration deceleration acceleration deceleration

SLIDE 6

CEBAF Energy Recovery Experiment Alex Bogacz, et al

APS April Meet ing, Philadelphia, PA, April 7, 20 0 3

6 Phase delay chicane and energy recovery ext ract ion line

SLIDE 7

CEBAF Energy Recovery Experiment Alex Bogacz, et al

APS April Meet ing, Philadelphia, PA, April 7, 20 0 3

7 ♦ Nort h L

inac − st andard 1 20° lat t ice for t he accelerat ing beam (56−556 MeV) and mismat ched opt ics for t he decelerat ing beam (1 0 56−556 MeV)

339.796 Mon Apr 07 11:10:17 2003 OptiM - MAIN: - E:\ER_Experiment\ER Optics\400 MeV Design Optics\EneRec\inj_NL.opt 80 5

BETA_X&Y[m] DISP_X&Y[m] BETA_X BETA_Y DISP_X DISP_Y 243.668 Mon Apr 07 10:57:48 2003 OptiM - MAIN: - E:\ER_Experiment\ER Optics\400 MeV Design Optics\EneRec\NL_dec.opt 140 5 BETA_X&Y[m] DISP_X&Y[m] BETA_X BETA_Y DISP_X DISP_Y

SLIDE 8

CEBAF Energy Recovery Experiment Alex Bogacz, et al

APS April Meet ing, Philadelphia, PA, April 7, 20 0 3

8 ♦ Sout h Linac − mismat ched opt ics for t he accelerat ing beam (556−1

0 56 MeV) and st andard 1 20° lat t ice for t he decelerat ing beam (556−56 MeV)

248.379 Mon Apr 07 11:04:17 2003 OptiM - MAIN: - E:\ER_Experiment\ER Optics\400 MeV Design Optics\EneRec\SL_acc.opt 200 5 BETA_X&Y[m] DISP_X&Y[m] BETA_X BETA_Y DISP_X DISP_Y 207.213 Mon Apr 07 11:08:01 2003 OptiM - MAIN: - E:\ER_Experiment\ER Optics\400 MeV Design Optics\EneRec\SL_dec.opt 60 5

BETA_X&Y[m] DISP_X&Y[m] BETA_X BETA_Y DISP_X DISP_Y

SLIDE 9

CEBAF Energy Recovery Experiment Alex Bogacz, et al

APS April Meet ing, Philadelphia, PA, April 7, 20 0 3

9

Arc1

synchrot ron light monit or − accelerat ed/decelerat ed beams at 556 MeV

SLIDE 10

CEBAF Energy Recovery Experiment Alex Bogacz, et al

APS April Meet ing, Philadelphia, PA, April 7, 20 0 3

1

Two beams (~ 1

GeV and ~ 1 0 0 MeV) at t he end of Sout h Linac − SL1 6 beam viewer (Einj = 20 MeV)

SLIDE 11

CEBAF Energy Recovery Experiment Alex Bogacz, et al

APS April Meet ing, Philadelphia, PA, April 7, 20 0 3

1 1

Energy recovered beam at t he dump (Opt ical Transit ion Radiat ion view)

56 MeV beam 20 MeV beam

SLIDE 12

CEBAF Energy Recovery Experiment Alex Bogacz, et al

APS April Meet ing, Philadelphia, PA, April 7, 20 0 3

1 2

♦ Typical wire scan wit h t wo beams − fully accelerat ed and energy recovered beams

500 400 300 200 100 35 30 25 20 15 10 5 56 MeV Beam

Wire scan at 2L22: X, X-Y, Y

1056 MeV Beam mm current

SLIDE 13

CEBAF Energy Recovery Experiment Alex Bogacz, et al

APS April Meet ing, Philadelphia, PA, April 7, 20 0 3

1 3

Beam halo (56 MeV, 1 µA beam) measured wit h a wire scanner and 3 PMTs

SLIDE 14

CEBAF Energy Recovery Experiment Alex Bogacz, et al

APS April Meet ing, Philadelphia, PA, April 7, 20 0 3

1 4

Beam halo (20 MeV, 1 µA beam) measured wit h a wire scanner and 3 PMTs

SLIDE 15

CEBAF Energy Recovery Experiment Alex Bogacz, et al

APS April Meet ing, Philadelphia, PA, April 7, 20 0 3

1 5

rf power measurement − select ed cavit y at t he end of Sout h Linac

0.15 0.10 0.05 0.00

0.05
0.10

Volts (mV)

400 300 200 100

Time (µs)

with ER without ER

Gradient Modulator Drive Signals (SL20 Cavity 8)

Graph Courtesy C. Tennant

SLIDE 16

CEBAF Energy Recovery Experiment Alex Bogacz, et al

APS April Meet ing, Philadelphia, PA, April 7, 20 0 3

1 6

Summary

1 GeV scale demonst rat ion of energy recovery at CEBAF

8 0 µA of CW beam accel. t o 1 0 56 MeV and energy recovered at 56 MeV Demonst rat ion of high final-t o-inject ion energy rat ios − 20 :1 and 50 :1 Measurement s − Charact erist ics of energy recovered beam:

Emit t ance

Inject or and Arcs − wire scans wit h varying quads
Ext ract ion line (energy recov. beam) − wire scans wit h ‘closed bet a bump’

CEBAF Energy Recovery Experiment

Alex Bogacz for E0 2-1 0 2 Collaborat ion at J-Lab

2 Overview Mot ivat ion, Fut ure accelerat ors based on ERLs (Energy Recovery Linacs) Experiment layout , Beam t ransport , Inst rument at ion Measurement s – charact erist ics of energy recovered beam

♠ Emit t ance, moment um spread ♠ Beam halo ♠ RF cavit y t ransient s

Preliminary result s (energy recovered beam at 56 MeV and 20 MeV) Summary

3

Energy recovery* − process by which t he energy invest ed in accelerat ing

a beam is ret urned t o t he rf cavit ies by decelerat ing t he same beam

W

hy Energy Recover?

superior emit t ance and energy spread, short bunches (sub-pico sec.) Fut ure Applicat ions:

♦ Free Elect ron Lasers ♦ Synchrot ron Light Sources ♦ Elect ron Cooling Devices ♦ Elect ron Ion Colliders

*Maury Tigner, Nuovo Ciment o 37 (1

4

10 100 1000 10000 100 200 300

Average Current [mA] Energy [MeV]

ERL Landscape

Light Sources Elect r on-I on Colliders

eRHI C ELI C ERLSYN ERL 4GLS

1 kW FEL

10 kW FEL BNL Elect ron Cooling ERL P rot ot ype 100 kW FEL CEBAF-ER

High current pat h High energy pat h

10 100 1000 10000 100 200 300

Average Current [mA] Energy [MeV]

ERL Landscape

Light Sources Light Sources Elect r on-I on Colliders Elect r on-I on Colliders

eRHI C ELI C ERLSYN ERL 4GLS

1 kW FEL

10 kW FEL BNL Elect ron Cooling ERL P rot ot ype 100 kW FEL CEBAF-ER

High current pat h High energy pat h

5

Experiment Layout

♦ New hardware − a λ/2 chicane and a beam dump/chicane at t he end of t he Sout h

decelerat ed t hrough t he Nort h Linac and Sout h Linac. 56MeV 56MeV λ/2 phase delay chicane

56MeV 556MeV 556MeV 1056MeV 556MeV 1056MeV 56MeV 556MeV acceleration deceleration acceleration deceleration

6 Phase delay chicane and energy recovery ext ract ion line

7

♦ Nort h L

inac − st andard 1 20° lat t ice for t he accelerat ing beam (56−556 MeV) and mismat ched opt ics for t he decelerat ing beam (1 0 56−556 MeV)

8

♦ Sout h Linac − mismat ched opt ics for t he accelerat ing beam (556−1

0 56 MeV) and st andard 1 20° lat t ice for t he decelerat ing beam (556−56 MeV)

9

Arc1

synchrot ron light monit or − accelerat ed/decelerat ed beams at 556 MeV

1

Two beams (~ 1

GeV and ~ 1 0 0 MeV) at t he end of Sout h Linac − SL1 6 beam viewer (Einj = 20 MeV)

1 1

Energy recovered beam at t he dump (Opt ical Transit ion Radiat ion view)

56 MeV beam 20 MeV beam

1 2

♦ Typical wire scan wit h t wo beams − fully accelerat ed and energy recovered beams

1 3

Beam halo (56 MeV, 1 µA beam) measured wit h a wire scanner and 3 PMTs

1 4

Beam halo (20 MeV, 1 µA beam) measured wit h a wire scanner and 3 PMTs

1 5

rf power measurement − select ed cavit y at t he end of Sout h Linac

1 6

Summary

1

GeV scale demonst rat ion of energy recovery at CEBAF

8 0 µA of CW beam accel. t o 1 0 56 MeV and energy recovered at 56 MeV Demonst rat ion of high final-t o-inject ion energy rat ios − 20 :1 and 50 :1 Measurement s − Charact erist ics of energy recovered beam:

Emit t ance

Beam halo (wire scanner and PMTs) − 6 decades of int ensit y covered rf t ransient s at full charge (50 µA pulsed beam)

Dat a analysis in progress… .. Expect at ion for ongoing machine act ivit ies at CEBAF