Commissioning results of the BNL/SLAC/UCLA symmetrized 1.6-cell S-band emittance-compensated photoinjector

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

doi:10.1117/12.274370

15 May 1997 Commissioning results of the BNL/SLAC/UCLA symmetrized 1.6-cell S-band emittance-compensated photoinjector

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

Author Affiliations +

Proceedings Volume 2988, Free-Electron Laser Challenges; (1997) https://doi.org/10.1117/12.274370
Event: Photonics West '97, 1997, San Jose, CA, United States

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.

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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, and V. Yakimenko "Commissioning results of the BNL/SLAC/UCLA symmetrized 1.6-cell S-band emittance-compensated photoinjector", Proc. SPIE 2988, Free-Electron Laser Challenges, (15 May 1997); https://doi.org/10.1117/12.274370

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