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WP10.6 Advanced Photocathodes Developement

This project aims to construct an injector for high-quality electron beam with specific applications. It involves the development of Pb/Nb films for the SRF injector and the construction of a unique laser for Pb cathode excitation. The program also includes the deposition, treatment, and structural studies of DAC Pb photocathodes.

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WP10.6 Advanced Photocathodes Developement

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  1. WP10.6 Advanced Photocathodes Developement DESY Jacek Sekutowicz HZB Thorsten Kamps HZDR Jochen Teichert IOE MUT Henryk Fiedorowicz IPJ Robert Nietubyć BNL John Smedley MBI Ingo Will TJNAF Peter Kneisel

  2. Introduction UV laser Motivation To construct an injector for high quality electron beam of parameters dedicated for specific applications. High bunch charge for pulse FEL and high average current for ERL and CW FELs. The part of the proposed programme is an improvement of CARE and Eucard achievements - Pb/Nb films for SRF injector, another part is an expansion to the field of DAC photocathodes and constrution of unique laser for Pb cathode excitation. DAC Pb Hobicat at HZB, May 2011 IPJ, September 2011

  3. Organisation Advanced Photocathodes Developement DAC Pb deposition, treatment and structural studies injector cavity design & engineering laser measurements SR tests injector tests HZDR IOE (MBI) IPJ DESY HZB

  4. Baseline programme and fundamental deliverables Pb New deposition system built and operating, Pb samples layers without laser flattening. Thickness and cleanliness improvement design → construction →samples deposition Prototype M9 IPJ Pb sample layers deposited and flatten with the laser (optimized procedure), Post-deposition microdroplets removal and morphology improvement, filtering elimination Report M12 IPJ, IOE Structural studies of Pb/Nb films. XRD, PES, Report M18 HZB IPJ Measurements of electron beam emitted from a plug sample photocathodes morphology influence on the performance Report M24 HZDR

  5. Baseline programme and fundamental deliverables Pb Injector cavity preparation Improved design in term of electromagnetic field, additional cavity enables more tests Construction → comissioning → baseline Q tests → Pb Q test Report M18 DESY Laser 206 nm, 20 ps, 100 kHz, 1 W, An unique and dedicated laser providing UV pulses of short duration, high energy and high repetition rate is unavoidable to operate high average current an injector furnished with Pb photocathode Fundamental generator → Amplifier + puls shaping → Harmonics converter → assembly → comissioning → installation at Hobicat Prototype M30, IOE (MBI) Pb spot deposited on the e-gun cavity wall, flatted with the laser, QE and emittance measured in cold test Spot flattening → Installation → cleaning → Q measurements → QE measurements → e-beam diagnostics Measurements at HZB Report M36 HZB, DESY, IPJ, IOE

  6. Baseline programme and fundamental deliverables DAC Report M18 HZDR, HZB Design and engineering of cathode insert with diamond amplifier • SR test of DAC cell • Cell will be provided by BNL and tested at BESSY II beamline at HZB Report M30 HZB BNL • Test DAC in DC/SRF gun setup at HZDR and/or HZB • Test will be done at HZDR or HZB Report M36 HZB, HZDR

  7. Costs classification

  8. Costs classification Σ 1396 1083 837 (60%)

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