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P.R. Bolton

First Name: P

Middle Name: R

Last Name: Bolton

Full Name: P.R. Bolton

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2 papers
title: Photoinjector design for the LCLS
format: conference proceeding
conference: FEL 2001 23rd
year: 2002
16 authors: P.R. Bolton | Clendenin, J. E. | Dowell, D. H. | M. Ferrario | A.S. Fisher | Gierman, S. M. | Kirby, R. E. | P. Krejcik | Limborg, C. G. | Mulhollan, G. A. | D. C. Nguyen | D. T. Palmer | J.B. Rosenzweig | Schmerge, J. F. | L. Serafini | X.J. Wang
abstract: The design of the Linac Coherent Light Source assumes that a low-emittance, 1 nC, 10 ps beam will be available for injection into the 15 GeV linac. The proposed RF photocathode injector that will meet this requirement is based on a 1.6-cell S-band RF gun equipped with an emittance-compensating solenoid. The booster accelerator with a gradient of 25 MV/m is positioned at the beam waist coinciding with the first emittance maximum, i.e., the "new working point." The UV pulses required for cathode excitation will be generated by tripling the output of a Ti:sapphire laser system. Details of the design and the supporting simulations are presented. (12 References).

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title: New design study and related experimental program for the LCLS RF photoinjector
format: conference proceeding
conference: EPAC 2000
year: 2000
11 authors: M. Ferrario | P.R. Bolton | Clendenin, J. E. | Dowell, D. H. | Gierman, S. M. | M. E. Hernandez | D. C. Nguyen | D. T. Palmer | J.B. Rosenzweig | Schmerge, J. F. | L. Serafini
abstract: We report the results of a recent beam dynamics study, motivated by the need to redesign the LCLS photoinjector, that lead to the discovery of a new effective working point for a split RF photoinjector. We consider the emittance compensation regime of a space charge beam: by increasing the solenoid strength, the emittance evolution shows a double minimum behavior in the drifting region. If the booster is located where the relative emittance maximum and the envelope waist occur, the second emittance minimum can be shifted to the booster exit and frozen at a very low level (0.3 mm-mrad for a 1 nC flat top bunch), to the extent that the invariant envelope matching conditions are satisfied. Standing Wave Structures or alternatively Traveling Wave Structures embedded in a Long Solenoid are both candidates as booster linac. A careful measurement of the emittance evolution as a function of position in the drifting region is necessary to verify the computation and to determine experimentally the proper position of the booster cavities. The new design study and supporting experimental program under way at the SLAC Gun Test Facility are discussed.

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