4 papers

title:	Emittance Studies of the BNL/SLAC/UCLA 1.6 Cell Photocathode RF Gun
format:	conference procceeding
conference:	1997 Particle Accelerator Conference
year:	1998
11 authors:	D. T. Palmer | X. J. Wang | R. H. Miller | M. Babzien | I. Ben-Zvi | C. Pellegrini | J. Sheehan | J. Skaritka | H. Winick | M. Woodle | V. Yakimenko
abstract:	The symmetrized 1.6 cell S-band photocathode gun developed by the BNL/SLAC/UCLA collaboration is in operation at the Brookhaven Accelerator Test Facility (ATF). A novel emittance compensation solenoid magnet has also been designed, built and is in operation at the ATF. These two subsystems form an emittance compensated photoinjector used for beam dynamics, advanced acceleration and free electron laser experiments at the ATF. The highest acceleration field achieved on the copper cathode is 150 MV/m, and the guns normal operating field is 130 MV/m. The maximum rf pulse length is 3 mu s. The transverse emittance of the photoelectron beam were measured for various injection parameters. The 1 nC emittance results are presented along with electron bunch length measurements that indicated that at above the 400 pC, space charge bunch lengthening is occurring. The thermal emittance, epsilon_0, of the copper cathode has been measured. (7 References).
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title:	Initial commissioning results of the Next Generation Photoinjector
format:	conference procceeding
conference:	7th Advanced Accelerator Concepts Workshop
year:	1997
11 authors:	D. T. Palmer | X. J. Wang | R. H. Miller | M. Babzien | Ben-Zvi, I. | C. Pellegrini | Sheehan, J. | Skaritka, J. | H. Winick | M. Woodle | V. Yakimenko
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 emittance-compensated photoinjector consists of the symmetrized BNL/SLAC/UCLA 1.6 cell S-band photocathode radio-frequency (RF) 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 130 MV/m. The quantum efficiency of the copper cathode was measured to be 4.5*10/sup -5/. The transverse emittance and bunch length of the photoelectron beam were measured. The optimized RMS normalized emittance for a charge of 300 pC is 0.7 pi mm-mrad. The bunch length dependency of photoelectron beam on the RF gun phase and acceleration fields were experimentally investigated. (11 References).
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title:	Operational status of the Brookhaven National Laboratory Accelerator Test Facility
format:	conference procceeding
conference:	1989 Particle Accelerator Conference
year:	1989
18 authors:	Batchelor, K. | Ben-Zvi, I. | Biglio, I. | Chou, T. S. | R. Fernow | Fischer, J. | J. Gallardo | H. G. Kirk | Kurnit, N. | McDonald, K. T. | Palmer, R. B. | Parsa, Z. | C. Pellegrini | Sheehan, J. | Srinivasan-Rao, T. | Ulc, S. | M. Woodle | van Steenbergen, A.
abstract:	The design and operation of a 50-MeV electron linear accelerator utilizing a low emittance ( gamma epsilon =5 to 10 mm-mrad) radio-frequency gun operating at an output energy of 5 MeV and a charge of 1 nC are described. Design calculations, early radio-frequency measurements, and operational experience with the electron gun utilizing a dummy cathode in place of the proposed photocathode emitter are given. The dynamics of the electron beam coming off the photocathode has been modeled with the programs PARMELA and MASK. General agreement as to the expected characteristics of the electron beam at the RF-gun exit has been obtained using the two programs. It was also verified that, with proper matching of the transverse beam, no increase of the transverse normalized emittance occurs at the linac due to the fundamental RF mode. (5 References).
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title:	The Brookhaven Accelerator Test Facility
format:	conference procceeding
conference:	1988 Linear Accelerator Conference
year:	1989
16 authors:	Batchelor, K. | Chou, T. S. | R. C. Fernow | Fischer, J. | J. Gallardo | H. G. Kirk | Koul, R. | Palmer, R. B. | C. Pellegrini | Sheehan, J. | Srinivasan-Rao, T. | Ulc, S. | M. Woodle | Bigio, I. | Kurnit, N. | McDonald, K. T.
abstract:	The Brookhaven Accelerator Test Facility (ATF) will consist of a 50-100 MeV/c electron linac and a 100 GW CO/sub 2/ laser system. A high brightness RF-gun operating at 2856 MHz is to be used as the injector into the linac. The RF-gun contains a Nd:Yag-laser-driven photocathode capable of producing a stream of six ps electron pulses separated by 12.5 ns. The maximum charge in a micropulse will be one nano-Coulomb. The CO/sub 2/ laser pulse length will be a few picoseconds and will be synchronized with the electron pulse. The design electron beam parameters are given and possible initial experiments are discussed. (9 References).
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