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Single shot cathode transverse momentum imaging in high brightness photoinjectors
- Source :
- 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)
- Publication Year :
- 2020
-
Abstract
- Physical review accelerators and beams 23(4), 043401 (2020). doi:10.1103/PhysRevAccelBeams.23.043401<br />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.<br />Published by American Physical Society, College Park, MD
- Subjects :
- 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
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Journal :
- 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)
- Accession number :
- edsair.doi.dedup.....3b035fd03705f42cedacd4d9b3a3af6d