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

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 ler C. Hovat er M. Spat a A. Hut t on ♣ C. Tennant ♠ Y. Chao S. Chat t opadhyay R. Kazimi M. Tiefenback H. Toyokawa ∗ H. Dong R. Lauze 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 APS April Meet ing, Philadelphia, PA, April 7, 20 0 3

CEBAF Energy Recovery Experiment Alex Bogacz, et al 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 2 APS April Meet ing, Philadelphia, PA, April 7, 20 0 3

CEBAF Energy Recovery Experiment Alex Bogacz, et al 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 E fin /E inj ♦ 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) 3 APS April Meet ing, Philadelphia, PA, April 7, 20 0 3

CEBAF Energy Recovery Experiment Alex Bogacz, et al ERL Landscape ERL Landscape eRHI C eRHI C 10000 10000 ERL ERL ELI C ELI C ERLSYN ERLSYN High energy pat h High energy pat h Elect r on-I on Colliders Elect r on-I on Colliders Elect r on-I on Colliders Energy [MeV] Energy [MeV] 1000 1000 4GLS 4GLS CEBAF-ER CEBAF-ER Light Sources Light Sources Light Sources 100 kW FEL 100 kW FEL 10 kW FEL 10 kW FEL 100 100 ERL P ERL P rot ot ype rot ot ype BNL Elect ron Cooling BNL Elect ron Cooling 1 kW FEL 1 kW FEL High current pat h High current pat h 10 10 0 0 100 100 200 200 300 300 Average Current [mA] Average Current [mA] 4 APS April Meet ing, Philadelphia, PA, April 7, 20 0 3

CEBAF Energy Recovery Experiment Alex Bogacz, et al Experiment Layout acceleration 56MeV 56MeV 556MeV 1L21 1056MeV deceleration 556MeV acceleration 556MeV 1056MeV 56MeV 2L21 λ /2 phase delay chicane 56MeV 556MeV deceleration ♦ 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. 5 APS April Meet ing, Philadelphia, PA, April 7, 20 0 3

CEBAF Energy Recovery Experiment Alex Bogacz, et al Phase delay chicane and energy recovery ext ract ion line 6 APS April Meet ing, Philadelphia, PA, April 7, 20 0 3

CEBAF Energy Recovery Experiment Alex Bogacz, et al ♦ Nort h L inac − st andard 1 20 ° lat t ice for t he accelerat ing beam (56 − 556 MeV) 0 56 − 556 MeV) and mismat ched opt ics for t he decelerat ing beam (1 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] -5 0 0 BETA_X BETA_Y DISP_X DISP_Y 339.796 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] 0 0 0 BETA_X BETA_Y DISP_X DISP_Y 243.668 7 APS April Meet ing, Philadelphia, PA, April 7, 20 0 3

CEBAF Energy Recovery Experiment Alex Bogacz, et al ♦ Sout h Linac − mismat ched opt ics for t he accelerat ing beam (556 − 1 0 56 MeV) and 20 ° lat t ice for t he decelerat ing beam (556 − 56 MeV) st andard 1 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] 0 0 0 BETA_X BETA_Y DISP_X DISP_Y 248.379 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] -5 0 0 BETA_X BETA_Y DISP_X DISP_Y 207.213 8 APS April Meet ing, Philadelphia, PA, April 7, 20 0 3

CEBAF Energy Recovery Experiment Alex Bogacz, et al synchrot ron light monit or − accelerat ed/decelerat ed beams at 556 MeV � Arc1 9 APS April Meet ing, Philadelphia, PA, April 7, 20 0 3

CEBAF Energy Recovery Experiment Alex Bogacz, et al 0 0 MeV) at t he end of Sout h Linac − SL1 � Two beams (~ 1 GeV and ~ 1 6 beam viewer (E inj = 20 MeV) 1 0 APS April Meet ing, Philadelphia, PA, April 7, 20 0 3

CEBAF Energy Recovery Experiment Alex Bogacz, et al � Energy recovered beam at t he dump (Opt ical Transit ion Radiat ion view) 56 MeV beam 20 MeV beam 1 1 APS April Meet ing, Philadelphia, PA, April 7, 20 0 3

CEBAF Energy Recovery Experiment Alex Bogacz, et al ♦ Typical wire scan wit h t wo beams − fully accelerat ed and energy recovered beams current Wire scan at 2L22: X, X-Y, Y 1056 MeV Beam 500 400 56 MeV Beam 300 200 100 0 mm 0 5 10 15 20 25 30 35 1 2 APS April Meet ing, Philadelphia, PA, April 7, 20 0 3

CEBAF Energy Recovery Experiment Alex Bogacz, et al µ A beam) measured wit h a wire scanner and 3 PMTs � Beam halo (56 MeV, 1 1 3 APS April Meet ing, Philadelphia, PA, April 7, 20 0 3

CEBAF Energy Recovery Experiment Alex Bogacz, et al µ A beam) measured wit h a wire scanner and 3 PMTs � Beam halo (20 MeV, 1 1 4 APS April Meet ing, Philadelphia, PA, April 7, 20 0 3

CEBAF Energy Recovery Experiment Alex Bogacz, et al � rf power measurement − select ed cavit y at t he end of Sout h Linac Gradient Modulator Drive Signals (SL20 Cavity 8) 0.15 0.10 Volts (mV) 0.05 0.00 -0.05 with ER without ER -0.10 Graph Courtesy C. Tennant 0 100 200 300 400 Time ( µ s) 1 5 APS April Meet ing, Philadelphia, PA, April 7, 20 0 3

CEBAF Energy Recovery Experiment Alex Bogacz, et al Summary 1 GeV scale demonst rat ion of energy recovery at CEBAF 8 0 µ A 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’ Beam halo (wire scanner and PMTs) − 6 decades of int ensit y covered rf t ransient s at full charge (50 µ A pulsed beam) Dat a analysis in progress… .. Expect at ion for ongoing machine act ivit ies at CEBAF 1 6 APS April Meet ing, Philadelphia, PA, April 7, 20 0 3