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AAC 2000 9th

Name: AAC 2000 9th

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Date: 2000-01-01

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Created at: Fri Jul 27 23:53:35 -0700 2007

Updated at: Fri Jul 27 23:53:35 -0700 2007

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5 papers from the conference:

title: Commissioning and measurements of the Neptune photo-injector
format: conference proceeding
conference: AAC 2000 9th
year: 2001
6 authors: S. Anderson | Loh, M. | P. Musumeci | J.B. Rosenzweig | Suk, H. | M.C. Thompson
abstract: The photo-injector for the Neptune Advanced Accelerator Laboratory is introduced. Its component parts, including the radio frequency gun, photo-cathode drive laser system, booster linac, RF system, chicane compressor, beam diagnostics, and control system are described. The injector is designed to produce high brightness, short pulse electron beams. Measurements of the photo-injector beams including quantum efficiency, emittance, pulse length, and pulse compression are presented. (21 References).
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title: RF photoinjector development for a short-pulse, hard X-ray Thomson scattering source
format: conference proceeding
conference: AAC 2000 9th
year: 2001
6 authors: G.P. Le Sage | S. G. Anderson | T. E. Cowan | J. K. Crane | T. Ditmire | J.B. Rosenzweig
abstract: An important motivation in the development of the next generation X-ray light sources is to achieve picosecond and sub-ps pulses of hard X-rays for dynamic studies of a variety of physical, chemical anti biological processes. Present hard X-ray sources are either pulse-width or intensity limited, which allows ps-scale temporal resolution only for signal averaging of highly repetitive processes. A much faster and brighter hard X-ray source is being developed at LLNL, based on Thomson scattering of fs-laser pulses by a relativistic electron beam, which will enable X-ray characterization of the transient structure of a sample in a single shot. Experimental and diagnostic techniques relevant to the development of next generation sources including the Linac Coherent Light Source can be tested with the Thomson scattering hard X-ray source. This source will combine an RF photoinjector with a 100 MeV S-band linac. The photoinjector and linac also provide an ideal test-bed for examining space-charge induced emittance growth effects. A program of beam dynamics and diagnostic experiments are planned in parallel with Thomson source development. Our experimental progress and future plans will be discussed.
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title: IFEL experiment at the Neptune Lab
format: conference proceeding
conference: AAC 2000 9th
year: 2001
2 authors: P. Musumeci | C. Pellegrini
abstract: We present a two stage Inverse Free Electron Laser accelerator proposed for construction at the UCLA Neptune Lab. Proof-of-principle experiments on the IFEL scheme have been carried out successfully. This experiment is intended to achieve a 100 MeV energy gain, staging two IFEL modules. It will use a 16 MeV electron beam, a 1 TW CO/sub 2/ laser and two different tapered helical undulators. The problem of refocusing both laser and electron beam is analyzed in detail. A preliminary beam-line layout and numerical simulation are presented. (11 References).
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title: Trapping of background plasma electrons in a beam-driven plasma wake field using a downward density transition
format: conference proceeding
conference: AAC 2000 9th
year: 2001
4 authors: Suk, H. | N. Barov | J.B. Rosenzweig | E. Esarey
abstract: Trapping of background plasma electrons by a beam-driven plasma wake field is studied as a new self-injection method. In this scheme, a short electron beam pulse is sent through an underdense plasma with a downward density transition and some background plasma electrons are trapped by the strong wake field due to the sudden increase of the wake wave wavelength at the density transition. Two-dimensional PIC (Particle-In-Cell) simulations show that a significant amount of plasma electrons are trapped and accelerated to a higher energy than the driving beam energy. Furthermore, the trapped-beam quality is fairly good. In this paper, the 2-D simulation results, dynamics of the trapped beam and the driving beam, and the proposed experiment for the UCLA Neptune Laboratory are described. (15 References).
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title: Production and synchronization of electron beams from RF photoinjector/compressor systems for ultra-fast applications
format: conference proceeding
conference: AAC 2000 9th
year: 2001
2 authors: M.C. Thompson | J.B. Rosenzweig
abstract: The RF photoinjector, when coupled with a magnetic pulse compression system, is now an ubiquitous tool for production of sub-picosecond electron beam pulses which are to be used in advanced accelerator and light source experiments. As the time-scale for both pulse lengths and synchronization to external systems approaches the femtosecond level, a clear understanding of the longitudinal dynamics of the electron injector is required. This paper presents an analysis of the longitudinal beam dynamics of electron bunches in the photoinjector/compressor system from birth at the photocathode, through their initial violent acceleration in the RF gun, and subsequent phase space manipulation in the post-acceleration linac and magnetic chicane. The phenomena of phase focusing due to RF forces, and defocusing due to longitudinal space-charge, are discussed, as is the process of magnetic pulse compression. The issues relevant to synchronization of electron pulses with external lasers are examined, using the examples of beat-wave acceleration and Compton light sources, and solutions involving appropriate compressor configurations are proposed. Diagnosis of the relevant physical effects in such schemes is discussed.
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