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Proceedings Paper

Commissioning results of the BNL/SLAC/UCLA symmetrized 1.6-cell S-band emittance-compensated photoinjector
Author(s): Dennis T. Palmer; Xi Jie Wang; Roger H. Miller; Marcus Babzien; Ilan Ben-Zvi; Claudio Pellegrini; Joe Sheehan; John Skaritka; Triveni Srinivasan-Rao; Herman Winick; Martin H. Woodle; V. Yakimenko
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Paper Abstract

The BNL/SLAC/UCLA symmetrized 1.6 cell S-band emittance- compensated photoinjector has been installed at the Brookhaven Accelerator Test Facility (ATF). The commissioning results and performance of the photocathode injector are presented. This photoinjector consists of the symmetrized BNL/SLAC/UCLA 1.6 cell S-band photocathode radio frequency gun and a single solenoidal magnet for transverse emittance compensation. The highest acceleration field achieved on the cathode is 150 MV/m, and the normal operating field is 125 MV/m. The quantum efficiency of the copper cathode was measured to be 4.5 multiplied by 10-5. The measured quantum efficiency of the magnesium cathode is a factor of ten greater than that of copper after using both laser and laser assisted explosive electron emission cleaning. The transverse emittance and bunch length of the photoelectron beam were measured. The optimized rms normalized emittance for a charge of 329 plus or minus 12 pC is 2.0 plus or minus 0.3 pi mm-mrad. The bunch length dependency of photoelectron beam on the rf gun phase and acceleration fields were experimentally investigated. Electric and magnetic field asymmetries studies are presented.

Paper Details

Date Published: 15 May 1997
PDF: 12 pages
Proc. SPIE 2988, Free-Electron Laser Challenges, (15 May 1997); doi: 10.1117/12.274370
Show Author Affiliations
Dennis T. Palmer, Stanford Univ. (United States)
Xi Jie Wang, Brookhaven National Lab. (United States)
Roger H. Miller, Stanford Univ. (United States)
Marcus Babzien, Brookhaven National Lab. (United States)
Ilan Ben-Zvi, Brookhaven National Lab. (United States)
Claudio Pellegrini, Univ. of California/Los Angeles (United States)
Joe Sheehan, Brookhaven National Lab. (United States)
John Skaritka, Brookhaven National Lab. (United States)
Triveni Srinivasan-Rao, Brookhaven National Lab. (United States)
Herman Winick, Stanford Univ. (United States)
Martin H. Woodle, Brookhaven National Lab. (United States)
V. Yakimenko, Brookhaven National Lab. (United States)

Published in SPIE Proceedings Vol. 2988:
Free-Electron Laser Challenges
Patrick G. O'Shea; Harold E. Bennett, Editor(s)

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