Setup for Cooled GaAs Cathodes With Increased Charge Lifetime

Eggert, Tobias; Enders, J.; Espig, Martin; Fritzsche, Yuliya; Kurichiyanil, Neeraj; Wagner, Markus R.

doi:10.18429/jacow-ipac2018-thpmk100

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Photocathode Preparation System1

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2019

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“…Not discussed in this manuscript, is a chamber being set up with an inverted-insulator high-voltage DC electrode in which activated cathodes will be placed for long-term tests and dedicated experiments [21,22]. The system will also be augmented by a sixth UHV chamber in which cooling a high-voltage electrode near the photocathode is foreseen to minimize the residual-gas pressure for an extended lifetime [23].…”

Section: Photocathode Preparation Systemmentioning

confidence: 99%

A test system for optimizing quantum efficiency and dark lifetime of GaAs photocathodes

et al. 2019

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Gallium-arsenide-based photocathodes are used for a variety of applications, including electron-beam production for particle accelerators. An ultra-high vacuum teststand has been developed for cleaning and preparation of photocathodes. First studies using the apparatus were carried out investigating quantum efficiency and vacuum (dark) lifetimes of GaAs photcathodes that were prepared using different procedures involving Cs, Li, and O 2 . While the two-stage activation procedure with Cs and O 2 yielded the highest quantum efficiency of up to (25.9 ± 1.3) % at wavelength 405 nm, the vacuum lifetime of cathodes activated with Cs, Li, and O 2 using a two-stage process exceeded those obtained in single-stage process by more than a factor of three.

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Section: Photocathode Preparation Systemmentioning

confidence: 99%