Photocathode research at SLAC

Mulhollan, G. A.; Clendenin, J. E.; Garwin, E.L.; Kirby, R. E.; Maruyama, T.; Prepost, R.; Tang, Huan

doi:10.1063/1.54992

“…Ni-plating the Kovar prior to brazing helped. 6 Eventually an ANSYS 5.1 study of the temperature response was used to determine the optimum length of the Mo cup to keep the temperature of the brazed joint below 250 °C [2]. A new Mo-length of 31 cm was chosen.…”

Section: Improvementsmentioning

confidence: 99%

“…The all solidstate Nd:YLF-pumped Ti:sapphire short-pulse laser is used for filling PEP-II and for other experiments not requiring polarized electrons. The flash lamp-pumped longpulse Ti:sapphire laser 1 has been recently improved for a fixed-target experiment 2 that requires a high-charge polarized beam. The characteristics of the PES are listed in Table 1.…”

Section: Introductionmentioning

confidence: 99%

The SLAC Polarized Electron Source

Clendenin¹,

Brachmann²,

Galetto³

et al. 2003

AIP Conference Proceedings

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The SLAC PES, developed in the early 1990s for the SLC, has been in continuous use since 1992, during which time it has undergone numerous upgrades. The upgrades include improved cathodes with their matching laser systems, modified activation techniques and better diagnostics. The source itself and its performance with these upgrades will be described with special attention given to recent high-intensity long-pulse operation for the E-158 fixed-target parity-violating experiment. (PESP 2002), September 4-6, 2002 Abstract. The SLAC PES, developed in the early 1990s for the SLC, has been in continuous use since 1992, during which time it has undergone numerous upgrades. The upgrades include improved cathodes with their matching laser systems, modified activation techniques and better diagnostics. The source itself and its performance with these upgrades will be described with special attention given to recent high-intensity long-pulse operation for the E-158 fixedtarget parity-violating experiment. Presented at the Workshop on Polarized Electron Sources and Polarimeters

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“…In preparation for a new set of tests at the CTF, a clever crystal mounting schemeÐshown in Fig. 4Ðhas been developed at SLAC (24). A slurry cutter is used to cut a Òtop hatÓ cross section from the original ~1-mm thick GaAs wafer with a precision of a few micrometers.…”

Section: Review Of Randd Progressmentioning

confidence: 99%

Polarized RF guns

Clendenin¹

1999

AIP Conference Proceedings

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RF guns employing photocathodes are now well established as viable electron sources for accelerator applications. For high-energy accelerators, the desirable properties of such sources include the relative ease of pulse formation (using the source laser system to establish the pulse shape and number) and a low transverse beam emittance, eliminating the need for rf chopping and bunching systems and reducing the demands on emittance-reducing damping rings. However, most high-energy accelerators now require polarized electrons. Polarized electron beams can in principle be generated by substituting a III-V semiconductor, such as GaAs, for the traditional photocathode in a conventional rf gun structure. In the past, the principal criterion for selection of photocathodes for rf guns has been the ability to maintain a reasonable quantum yield from the cathode over a relatively long operating period. It is well known that GaAs is significantly more sensitive to the vacuum environment than any of the cathode types that have been used to date. However, advances in our understanding of how to operate GaAs cathodes in hostile environments combined with similar advances in our ability to prepare gun structures that will significantly reduce dark current and rf breakdown lend credibility to the prospect of successfully operating an rf gun with an activated GaAs cathode. The status of research related to polarized rf guns is reviewed and the outline of a future polarized rf source combining the best of what is known today is presented. Invited presentation at the 8 th Workshop on

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“…The all solidstate Nd:YLF-pumped Ti:sapphire short-pulse laser is used for filling PEP-II and for other experiments not requiring polarized electrons. The flash lamp-pumped longpulse Ti:sapphire laser 1 has been recently improved for a fixed-target experiment 2 that requires a high-charge polarized beam. The characteristics of the PES are listed in Table 1.…”

Section: Introductionmentioning

confidence: 99%

The SLAC polarized electron source

Clendenin¹,

Alley²,

Frisch³

et al. 1998

AIP Conference Proceedings

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The SLAC PES, developed in the early 1990s for the SLC, has been in continuous use since 1992, during which time it has undergone numerous upgrades. The upgrades include improved cathodes with their matching laser systems, modified activation techniques and better diagnostics. The source itself and its performance with these upgrades will be described with special attention given to recent high-intensity long-pulse operation for the E-158 fixed-target parity-violating experiment. (PESP 2002), September 4-6, 2002 Abstract. The SLAC PES, developed in the early 1990s for the SLC, has been in continuous use since 1992, during which time it has undergone numerous upgrades. The upgrades include improved cathodes with their matching laser systems, modified activation techniques and better diagnostics. The source itself and its performance with these upgrades will be described with special attention given to recent high-intensity long-pulse operation for the E-158 fixedtarget parity-violating experiment. Presented at the Workshop on Polarized Electron Sources and Polarimeters

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Photocathode research at SLAC

Abstract: GaAs based photocathode research at SLAC will be described. Recent eorts have focused on both immediate applications and fundamental photocathode properties. This includes revisiting some old measurements with stateof-the-art instrumentation.

Cited by 3 publications

References 2 publications

The SLAC Polarized Electron Source

The SLAC Polarized Electron Source

Polarized RF guns

The SLAC polarized electron source

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