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10MW Klystron

SuperKEKB injector upgrade for high charge and low emittance electron beam. M. Yoshida, N. Iida, Y. Ogawa, T. Osawa , Z. Lei T. Natsui , M. Sato, H. Sugimoto, X. Zhou High Energy Accelerator Organization (KEK). Ir 5 Ce Photocathode. High charge & low emittance RF-Gun :.

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10MW Klystron

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  1. SuperKEKB injector upgrade for high charge and low emittance electron beam. M. Yoshida, N. Iida, Y. Ogawa, T. Osawa, Z. Lei T. Natsui, M. Sato, H. Sugimoto, X. ZhouHigh Energy Accelerator Organization (KEK) Ir5Ce Photocathode High charge & low emittance RF-Gun : • 3-2 RF-Gun (from Sep 2011) : • PF/PF-AR Injection during SuperKEKB construction phase • 5nC test stand for SuperKEKB Present beam statue Cathode rod • A-1 RF-Gun (will install until Sep 2012) • Cavity : Higher electric focusing field => Quasi traveling wave • Cathode • Ir5Ce at room temperature => QE :10-4 • LaB6 or Ir5Ce with heater => QE :10-3 • Laser : Higher power & stable laser => Yb based chirped pulse amplification Cavity : Disk and Washer Quasi traveling wave side couple RF gun (100 MV/m, 6mm-mrad, 13.5 MeV) Laser : Nd doped solid state laser DAW-type RF gun (90 MV/m, 5 mm-mrad, 3.2 MeV) - Nd:YVO4 + SESAM passive modelock oscillator BNL-type RF gun (120 MV/m, 11.0 mm-mrad, 5.5 MeV) Cathode : LaB6 => Ir5Ce BNL (3.8 mm) Beam Size DAW (1.7 mm) - Nd:YAG 5-stage amplifier QTW (0.2 mm) Injection beam line on the angle Linac beam line • High charge & low emittance RF-Gun • Cavity with electric focusing field • Disk and Washer => 3-2 • Quasi Traveling Wave => A-1 • Long life cathode QE : 10-4 • LaB6, Ir5Ce at room temperature • High power laser > mJ @ 266nm • Nd doped solid state laser • Yb doped fiber & solid state laser • Beam transport • Alignment • Emittance preservation • Beam diagnostics Longer bunch can reduce space charge effect inside RF-Gun and also CSR at J-ARC. High charge low emittance is required for SuperKEKB. RF-Gun 5-10nC 1.1GeV@DR B A J-ARC A-1 PF C-1 3-2 RF-Gun 40 nC BCS RF-Gun Target @1-4 3.5 GeV 10nC x 2 ECS 1 2 4 Beam diagnostic station C 3 5 ECS for LER 4.0 GeV 4nC x 2 ey < 6 mm mrad C-band • Due to mis-alignment: • Dispersion • Short range wakefield for HER 7.0 GeV 5nC x 2 ey < 20 mm mrad Pulse Q-magnet & pulse steering Emittance preservation : Present projected emittance measurement Simulation of projected emittance Projected emittance dilution due to transverse wakefield Wire scanner should install more. Existing wire scanner A σz=2 mm σa=0.3mm B σz=0.75mm σa=0.3mm Beam tracking simulation : Intialemittance : 6 mm mrad Mis-alignment : s = 0.3mm Transverse Wakefield Measurement => Initial offsetusing X-band RF-Deflector PF Injection DC-Gun J-ARC 1st order 5 3 4 C 1 2 2nd order Initial offset RF-Deflector z σz=2 mm σa=0.1mm σz=0.75mm σa=0.1mm y x Project emittance using weak lens t Emittance measurement at 5-sector A Consideration of bunch compression using J-ARC RF-Deflectordeveloped by SLAC PF Injector B Weak lens 5 3 4 1 2 C Emittance (mm mrad) Input Power : 10MW Deflecting Voltage : 22 MV Initial offset scan to compensate transverse wakefield 1.5m RF-Deflector Beam diagnostic station In third switch yard 窓 Beam tracking simulation 10MWKlystron

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