Single shot cathode transverse momentum imaging in high brightness photoinjectors
| Autor: | Osip Lishilin, Mikhail Krasilnikov, Guan Shu, David Melkumyan, Fernando Sannibale, Igor Isaev, F. Stephan, Peng-Wei Huang, Raffael Niemczyk, Grygorii Vashchenko, Ye Chen, Xiangkun Li, Hamed Shaker, Shankar Lal, Matthias Gross, Christian Koschitzki, A. Oppelt, Houjun Qian, Chuanxiang Tang, Weishi Wan, Daniele Filippetto |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Accelerator Physics (physics.acc-ph)
Nuclear and High Energy Physics Physics and Astronomy (miscellaneous) Physics::Instrumentation and Detectors FOS: Physical sciences Solenoid Electron 01 natural sciences Photocathode law.invention Optics law 0103 physical sciences lcsh:Nuclear and particle physics. Atomic energy. Radioactivity Thermal emittance ddc:530 010306 general physics physics.acc-ph Physics 010308 nuclear & particles physics business.industry Surfaces and Interfaces Photoelectric effect Laser Nuclear & Particles Physics Cathode Transverse plane Physical Sciences lcsh:QC770-798 Physics::Accelerator Physics Physics - Accelerator Physics business |
| Zdroj: | Physical Review Accelerators and Beams, vol 23, iss 4 Physical review accelerators and beams 23(4), 043401 (2020). doi:10.1103/PhysRevAccelBeams.23.043401 Physical Review Accelerators and Beams, Vol 23, Iss 4, p 043401 (2020) |
| Popis: | Physical review accelerators and beams 23(4), 043401 (2020). doi:10.1103/PhysRevAccelBeams.23.043401 In state of the art photoinjector electron sources, thermal emittance from photoemission dominates the final injector emittance. Therefore, low thermal emittance cathode developments and diagnostics are very important. Conventional thermal emittance measurements for the high gradient gun are time-consuming and thus thermal emittance is not measured as frequently as quantum efficiency during the lifetime of photocathodes, although both are important properties for the photoinjector optimizations. In this paper, a single shot measurement of photoemission transverse momentum, i.e., thermal emittance per rms laser spot size, is proposed for photocathode rf guns. By tuning the gun solenoid focusing, the electrons’ transverse momenta at the cathode are imaged to a downstream screen, which enables a single shot measurement of both the rms value and the detailed spectra of the photoelectrons’ transverse momenta. Both simulations and proof of principle experiments are reported. Published by American Physical Society, College Park, MD |
| Databáze: | OpenAIRE |
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