Intrinsic emittance reduction in transmission mode photocathodes
- Cornell Univ., Ithaca, NY (United States). Cornell Lab. for Accelerator-Based Sciences and Education (CLASSE)
High quantum efficiency (QE) and low emittance electron beams provided by multi-alkali photocathodes make them of great interest for next generation high brightness photoinjectors. Spicer’s three-step model well describes the photoemission process; however, some photocathode characteristics such as their thickness have not yet been completely exploited to further improve the brightness of the generated electron beams. Here, we report on the emittance and QE of a multi-alkali photocathode grown onto a glass substrate operated in transmission and reflection modes at different photon energies. We observed a 20% reduction in the intrinsic emittance from the reflection to the transmission mode operation. This observation can be explained by inelastic electron-phonon scattering during electrons’ transit towards the cathode surface. Due to this effect, we predict that thicker photocathode layers will further reduce the intrinsic emittance of electron beams generated by photocathodes operated in transmission mode.
- Research Organization:
- Cornell Univ., Ithaca, NY (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC); National Science Foundation (NSF)
- Grant/Contract Number:
- SC0014338; SC0011643; PHY-1416318
- OSTI ID:
- 1469694
- Alternate ID(s):
- OSTI ID: 1243144
- Journal Information:
- Applied Physics Letters, Vol. 108, Issue 12; ISSN 0003-6951
- Publisher:
- American Institute of Physics (AIP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Rb based alkali antimonide high quantum efficiency photocathodes for bright electron beam sources and photon detection applications
|
journal | February 2017 |
Similar Records
Ultra low emittance electron beams from multi-alkali antimonide photocathode operated with infrared light
Rb based alkali antimonide high quantum efficiency photocathodes for bright electron beam sources and photon detection applications