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Jochen Teichert Forschungszentrum Dresden-Rossendorf Institut für Strahlenphysik

The SRF Photoinjector at ELBE a Test Bench for Future Studies and Developments. Jochen Teichert Forschungszentrum Dresden-Rossendorf Institut für Strahlenphysik Strahlungsquelle ELBE PF 510119, 01314 Dresden J.Teichert@fzd.de. ESGARD OMIA meeting, 11.09.07. Background.

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Jochen Teichert Forschungszentrum Dresden-Rossendorf Institut für Strahlenphysik

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  1. The SRF Photoinjector at ELBE a Test Bench for Future Studies and Developments Jochen Teichert Forschungszentrum Dresden-Rossendorf Institut für Strahlenphysik Strahlungsquelle ELBE PF 510119, 01314 Dresden J.Teichert@fzd.de ESGARD OMIA meeting, 11.09.07

  2. Background Development of a SCRF Photoinjectorhigh brightness & high average current Supported by EU within CARE/PHIN and the German BMBF with DESY, BESSY, MBI

  3. Background Installation at ELBE and Commissioning in Summer 2007 He supply tube cryostat vessel emittance compensation solenoid Laser input port beam dump

  4. Background First operating prototype SRF Photoinjector at an accelerator facility SRF Photoinjector test bench

  5. Proposed SRF-AS Activities

  6. JRA1 – SC Cavities R2 Improved SCRF gun cavity • strong field emission at comparably • low gradients • problem: surface probably polluted due to uncleaned choke filter – • insufficient HPR results High brightness requires high acceleration gradient εn = 1 µm @ 1 nC needs 50 MV/m peak field • New SRRF gun cavity • Optimization of cavity • shape with respect to • BCP and HPR • Simplification • tuner, HOM coupler • Improvement • LF detuning, He-pressure • - Large grain Nb

  7. JRA2 – Accelerator and Beam Studies R3 Emittance compensation studies • Instead of the Solenoid • Around the cavity at • NC RF photoinjectors: • Solenoid downstream • RF focusing by • backtracked or/and • shaped cathode • TE mode in cavity • All methods have to be • experimentally proofed Slice emittance measurement with correlated Energy spread and spectrometer at ELBE T. Kamps, BESSY Berlin

  8. JRA2 – Accelerator and Beam Studies R4 SCRF gun for polarized electrons RF photo injectors produces e-beams with the highest brightness but They cannot produces polarized electrons (bad vacuum in the NC Cu-cavtiy) up to now only DC-photoinjectors can use GaAs cathodes alternative for the ILS electron source The SCRF gun is like a cryo-pump • Improvement of the cathode transfer and preparation system • Preparation of GaAs photocathodes • Test of the GaAs photocathodes in the SCRF gun Advantages - green light instead of UV: simplification of lasers for CW, ERL injectors - polarized e- source with lowest emittance for community - benefit for inverse Compton-scattering experiments at FZD

  9. JRA2 – Accelerator and Beam Studies Yb:YAG Oscillator Yb:YAG Pre ampl. pump diode SESAM Multi-passYb:YAG Amplifier Yb:YAG Power Supply 3 m Diodes 7 m Injector Power Supply Linac Power Supply Focusing quadupoles SRF gun Solenoid SRF linac Collimating chicane Photoinjector laser 1.5 m LHe Dewar LHe Refrigerator R5 SCRF gun measurements • The Rossendorf is the first operating prototype of a SCRF gun • High brightness – high average current injectors are needed elsewhere: • Injectors for ERL light source – higher current • Injector for BESSY FEL • Compact Compton-back-scattering x-ray source • Test bench for investigation of critical components W. Graves, MIT

  10. Collaboration

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