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FEL 1996 18th

Name: FEL 1996 18th

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Date: 1996-01-01

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Created at: Fri Jul 27 23:53:36 -0700 2007

Updated at: Fri Jul 27 23:53:36 -0700 2007

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3 papers from the conference:

title: TDA3D: Updates and improvements to the widely used three-dimensional free electron laser simulation
format: conference proceeding
conference: FEL 1996 18th
year: 1997
7 authors: B. Faatz | W. Fawley | P. Pierini | Sven Reiche | G. Travish | D. Whittum | J. Wurtele
abstract: TDA3D is a widely distributed and often used Free Electron Laser (FEL) simulation code. While a number of versions of TDA exist, this paper describes the official version which is well tested and supported. We describe the capabilities of the code emphasizing recent improvements and revisions. TDA3D is a steady-state (time-independent) amplifier code. The code self-consistently solves, after averaging over a wiggler period, the paraxial wave equation for the radiation field and the Lorentz equations of motion for the electrons. The paraxial wave equation includes diffraction and optical guiding. The calculation of the electron beam motion takes into account longitudinal bunching and transverse betatron oscillations, so that emittance, energy spread, and external focusing can be properly modeled. Recent additions to the simulation include the ability to model natural wiggler focusing in one or both planes, alternating gradient quadrupoles or sextupoles, and ion channels. The initial loading of the electron distribution can be controlled to allow for matching into focusing channels, improved quiet starts (non-correlated phase-space distributions), and arbitrary energy spread.
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title: The UCLA high gain infrared free electron laser
format: conference proceeding
conference: FEL 1996 18th
year: 1997
5 authors: M. Hogan | C. Pellegrini | J.B. Rosenzweig | G. Travish | A. A. Varfolomeev
abstract: A high gain SASE FEL amplifier designed to operate in the infrared (near 10 mu m) is being commissioned in the particle beam physics laboratory at UCLA. The high brightness beam needed to drive the FEL is provided by an RF photocathode gun employing solenoidal emittance compensation. A novel linac (a plane wave transformer) accelerates the beam to a final energy [left angle bracket]or=15 MeV. This beam is to be sent through a 60 cm long undulator with a period of 1.5 cm and an undulator parameter K approximately=1. Near future experiments will focus on FEL physics relevant to proposed short wavelength devices. Investigations of start-up from noise (SASE), effects of beam parameters on gain as well as noise fluctuations are of particular interest. Here we present an overview of the hardware including relevant diagnostics, measured beam parameters, FEL simulation results and the status of proposed experiments. (9 References).
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title: Space-charge oscillations in a self-modulated electron beam in multi-undulator free-electron lasers
format: conference proceeding
conference: FEL 1996 18th
year: 1997
5 authors: J.B. Rosenzweig | C. Pellegrini | L. Serafini | C. Ternieden | G. Travish
abstract: We examine here the oscillation of electron-beam density perturbations (longitudinal plasma oscillations) produced at the exit of a high-gain free-electron laser (FEL) by the action of the FEL instability. These oscillations, which are analyzed in the case of both a free-space drift and a dispersive section, can degrade the bunching of the beam in the drift between undulator sections in multi-stage FELs. The impact of these oscillations on the gain of an FEL in an undulator following such a drift, as well as the case of an optical klystron is studied. (9 References).
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