DC Injector and Space Charge Simulation Status Colwyn

DC Injector and Space Charge Simulation Status Colwyn Gulliford, Injector Team cg 248@cornell. edu CBETA Technical Review, 30 January 2017 1/1

Injector Status Injector work to date (Dec 2016): • Installed in CBETA experimental hall • All subsystems tested • Initial beam recommissioning cg 248@cornell. edu CBETA Technical Review, 30 January 2017 2/1

Laser 50 MHz System: • 3 ps pulse length • 10 Watts • ~350 fs rms jitter • 10 µm rms pointing stability • Tunable Duty Factor: 5 E-6 – 1 • Longitudinal Shaping cg 248@cornell. edu CBETA Technical Review, 30 January 2017 3/1

Cathodes Cathode Growth Chamber Cathode Characterization cg 248@cornell. edu Cathode Load Lock System Example QE Scan of Offset Cathode for High Current Operation CBETA Technical Review, 30 January 2017 4/1

DC Electron Source Status Work to date: • Moved from Electron Source Development Lab • Installed in final position • Baked • HV Conditioned cg 248@cornell. edu CBETA Technical Review, 30 January 2017 5/1

DC Electron Source Status Work to date: • Moved from Electron Source Development Lab • Installed in final position • Baked • HV Conditioned Completed Sept 2016, Stable Operation at 350 k. V cg 248@cornell. edu CBETA Technical Review, 30 January 2017 6/1

DC Electron Source Status Work to date: • Moved from Electron Source Development Lab • Installed in final position • Baked • HV Conditioned Completed Sept 2016, Stable Operation at 350 k. V cg 248@cornell. edu CBETA Technical Review, 30 January 2017 7/1

Injector Cryomodule (ICM) Status ICM Work: • Installation June 2016 Ø Cool down to 4 K (6/9/2016) Ø System check at 2 K (6/15/2016) • ICM is fully tested and ready for RF power (October 2016) • Currently operating at 2 K (Jan 2017) Ø Active pumping of Insulation Vacuum Vessel Ø Active pumping of beamline UHV Ø Input coupler N 2 purge while ICM is idle (RF off) • Tested with beam up to 1000 k. V/cavity (Dec 2016) cg 248@cornell. edu CBETA Technical Review, 30 January 2017 8/1

Beamline Components Beamline Installed (Summer 2016) Diagnostics Calibration cg 248@cornell. edu Dump Temperature Buncher Processed (10/13/2016) CBETA Technical Review, 30 January 2017 9/1

Beam Running Summary of results Target, min. • Cathode: 1% QE, offset • Gun: 350 k. V • ICM: 1 Me. V / cavity • Laser: 5 W @ 50 MHz • Current: 1 m. A Achieved 3% 350 k. V 1 Me. V - CBETA needs further conditioning 10 W 4 m. A Achieved all necessary goals for this phase, ran out of time for push to UPP current cg 248@cornell. edu CBETA Technical Review, 30 January 2017 10/1

Current Activities Currently Main Linac Cryomodule (MLC) is being prepared to move to it’s final location for the MLC beam test (Wed) cg 248@cornell. edu CBETA Technical Review, 30 January 2017 11/1

Current Activities Currently Main Linac Cryomodule (MLC) is being prepared to move to it’s final location for the MLC beam test (Wed) For the injector: • Disassembly of diagnostic/dump sections • New switchyard and merge beam pipe • Building 4 additional magnets • Installation of (B 1) merger • Installation of (B 2) diagnostic line cg 248@cornell. edu CBETA Technical Review, 30 January 2017 12/1

Current Activities Currently Main Linac Cryomodule (MLC) is being prepared to move to it’s final location for the MLC beam test (Wed) For the injector: • Disassembly of diagnostic/dump sections • New switchyard and merge beam pipe • Building 4 additional magnets • Installation of (B 1) merger • Installation of (B 2) diagnostic line cg 248@cornell. edu CBETA Technical Review, 30 January 2017 13/1

Space Charge Simulations Optimize with (3 D) space charge in GPT to match specified beam sizes and divergence at the end of the first pass of MLC. cg 248@cornell. edu CBETA Technical Review, 30 January 2017 14/1

Space Charge Simulations Parameter Optimization Range 125 p. C Example Solution Gun Voltage 400 k. V Buncher Voltage/Phase (0, 90] k. V / - 90 deg 73 k. V / -90 deg SRF 1 Voltage/Phase (0, 1800] k. V / [-45, 45] deg 870 k. V / -6 deg SRF 2 Voltage/Phase (0, 1800] k. V / [-45, 45] deg 1722 k. V / 3 deg SRF 3 Voltage/Phase (0, 1800] k. V / [-45, 45] deg 1493 k. V / 13 deg SRF 4 Voltage/Phase (0, 1800] k. V / [-45, 45] deg 1052 k. V / -26 deg SRF 5 Voltage/Phase (0, 1800] k. V / [-45, 45] deg 822 k. V / -33 deg Solenoid 1 Current (0, 6] Amps 4 Amps Solenoid 2 Current (0, 6] Amps 2. 5 Amps A 3 Quad Currents [-10, 10] Amps (0. 2, 0. 3, 1. 2, -3. 5) Amps B 1 Quad Currents [-10, 10] Amps (4. 3, -0. 9) Amps MLC Cavity Voltages/Phases 6 MV / (-2, 0, 0, 0) deg 125 p. C cg 248@cornell. edu CBETA Technical Review, 30 January 2017 15/1

Space Charge Simulations Parameter Optimization Range 25 p. C Example Solution Gun Voltage [300, 400] k. V 350 k. V Buncher Voltage/Phase (0, 90] k. V / - 90 deg 49. 5 k. V / -90 deg SRF 1 Voltage/Phase (0, 1800] k. V / [-45, 45] deg 1122 k. V / -9 deg SRF 2 Voltage/Phase (0, 1800] k. V / [-45, 45] deg 1791 k. V / 4 deg SRF 3 Voltage/Phase (0, 1800] k. V / [-45, 45] deg 1576 k. V / 16 deg SRF 4 Voltage/Phase (0, 1800] k. V / [-45, 45] deg 834 k. V / -33 deg SRF 5 Voltage/Phase (0, 1800] k. V / [-45, 45] deg 426 k. V / -15 deg Solenoid 1 Current (0, 6] Amps 3. 7 Amps Solenoid 2 Current (0, 6] Amps 2. 4 Amps A 3 Quad Currents [-10, 10] Amps (0. 1, 0. 4, 1. 5, -3. 6) Amps B 1 Quad Currents [-10, 10] Amps (4. 9, 3. 1, -0. 7) Amps MLC Cavity Voltages/Phases 6 MV / (-2, 0, 0, 0) Deg 6 MV / (-2, 0, 0, 0) deg 25 p. C cg 248@cornell. edu CBETA Technical Review, 30 January 2017 16/1

Summary • Optimized Space Charge simulations performed • Have KPP ready injector settings from simulations • Injector rebuilt/recommissioned • Reached KPP current, energy slightly lower than design • Preparing for MLC beam tests cg 248@cornell. edu CBETA Technical Review, 30 January 2017 17/1