3 papers

title:	Development of an X-Band PWT Photoinjector
format:	conference procceeding
conference:	2001 Particle Accelerator Conference
year:	2001
5 authors:	Newsham, D. | Luo, Y. | Zeng, J. | Yu, D. | J. B. Rosenzweig
abstract:	Development of an X-band Plane-Wave-Transformer (PWT), integrated photoinjector continues. Modifications of the end-cell design in this two-section device allow for simultaneous frequency and phase tuning of the accelerating field, thus preventing deceleration at the drift region that separates the two sections. The Los Alamos version of PARMELA is used to determine the expected performance parameters from the final design.
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title:	The development of S-band plane wave transformer photoinjector
format:	conference procceeding
conference:	1999 Particle Accelerator Conference
year:	1999
11 authors:	X. Ding | C. Pellegrini | J. B. Rosenzweig | S. Telfer | A. Tremaine | Vernon, W. | Yu, D. | Newsham, D. | Zeng, J. | Lee, T. | Chen, J.
abstract:	An integrated S-band RF photoinjector based on the plane wave transformer (PWT) is being built in the Particle Beam Physics Laboratory at UCLA in collaboration with DULY Research. This novel structure integrates a photocathode directly into a PWT linac making the structure simple and compact. Due to the strong coupling between each adjacent cell, this structure is relatively easy to fabricate and operate. This photoinjector can provide high brightness beams at energies of 15 to 20 MeV, with emittance less than 1 mm-mrad at charge of 1 nC. These short-pulse beams can be used in various applications: space charge dominated beam physics studies, plasma lenses, plasma accelerators, free-electron laser microbunching techniques, and SASEFEL physics studies. It will also provide commercial opportunities in chemistry, biology and medicine. The present status of the PWT photoinjector including fabrication and cold test to characterise the structure is described. RF system and photocathode drive laser system are also discussed.
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title:	A permanent-magnet focused X-band photoinjector
format:	conference procceeding
conference:	1999 Particle Accelerator Conference
year:	1999
8 authors:	Yu, D. | Newsham, D. | Wilson, P. | Zeng, J. | J. B. Rosenzweig | X. Ding | F. Hartemann | Landahl, E.
abstract:	A Plane-Wave-Transformer (PWT), integrated photoinjector operating at an X-band frequency (8.547GHz) is being developed by DULY Research Inc. in a DOE SBIR project, in collaboration with UCLA and UCD/ILSA. Upward frequency scaling from an S-band PWT photoinjector would result in a compact photoinjector with unprecedented brightness. Challenging technological innovations are required at X-band. In particular, water cooling capacity, mechanical support strength, and materials properties do not scale linearly with frequency. Instead of using large solenoids, we have successfully designed the required focusing for an X-band PWT using a compact, permanent magnet system. Also described in this paper is a system design of the X-band photoinjector, including the RF system and the cooling/support of the PWT structure.
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