Next Generation Robust Polarization Photocathodes for EIC
- Cornell Univ., Ithaca, NY (United States); Cornell University
- Cornell Univ., Ithaca, NY (United States)
Cornell group developed and characterized robust photocathodes dedicated to generation of spin-polarized electrons by employing a thin protective activation layer of a robust material in place of the conventional cesiation, which is extremely prone to the damage by ions and chemical poisoning. Various thicknesses of Cs2Te and of other materials on III-V semiconductors were studied to understand their effect on the cathode longevity and the polarization state. These photocathodes, as well as new alternative materials, will be eventually tested with high beam current for their operational (lifetime) performance in the Cornell HV DC guns, including a brand- new photoemission high voltage gun that features a cryogenically cooled photocathode holder. The research conducted opens a new and robust way to reach the negative electron affinity for a large class of photocathodes specifically designed to maximize their accelerator performance. It particular, it benefits the future EIC by improving the lifetime available from spin-polarized electron photoemission sources.
- Research Organization:
- Cornell Univ., Ithaca, NY (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Nuclear Physics (NP)
- DOE Contract Number:
- SC0016203
- OSTI ID:
- 1496836
- Report Number(s):
- DOE-CORNELL--0016203
- Country of Publication:
- United States
- Language:
- English
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