A High Polarization and High Quantum Efficiency Photocathode Using a GaAs-AlGaAs Superlattice

Journal Article · Sun Jan 15 00:00:00 EST 1995 · Japanese Journal of Applied Physics

DOI:https://doi.org/10.1143/JJAP.34.355· OSTI ID:1450460

Kurihara, Yoshimasa; Omori, Tsunehiko; Takeuchi, Yasunori; Yoshioka, Masakazu; Nakanishi, Tsutomu; Okumi, Syooji; Tawada, Mmasabumi; Togawa, Kazuaki; Tsubata, Mitsuru; Baba, Toshio; Mizuta, Masashi; Alley, Raymond K.; Aoyagi, Hideki; Clendenin, James E.; Frisch, Josef C.; Mulhollan, Gregory A.; Sáez, Pablo J.; Schultz, David C.; Tang, Huan; Witte, Klaus H.

A charge of 2.3 x 10(11) electrons in 2.5 ns at a laser wavelength of 757 nm with a corresponding quantum efficiency (QE) of 2.0% measured at 752 nm was extracted from a -120 kV biased, 20 mm diameter, GaAs-AlGaAs superlattice photocathode. The maximum electron polarization measured with material from the same wafer, but in a different system, was 71% at 757 nm for a QE of 1.0% measured at 752 nm. The quantity and temporal distribution of the extracted charge is consistent with a space charge limitation, rather than a cathode charge limit. The performance of this type of cathode makes it a possible candidate for future linear colliders.

• Research Organization: SLAC National Accelerator Lab., Menlo Park, CA (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: AC02-76SF00515
• OSTI ID: 1450460
• Report Number(s): SLAC-PUB-6530; JJAP
• Journal Information: Japanese Journal of Applied Physics, Vol. 34, Issue Part 1, No. 1; ISSN 0021-4922
• Country of Publication: United States
• Language: English