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EPAC 1998

Name: EPAC 1998

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Date: 1998-01-01

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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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3 papers from the conference:

title: Is the X-ray FEL the 4th generation light source?
format: conference proceeding
conference: EPAC 1998
year: 1998
1 author: C. Pellegrini
abstract: Recent theoretical and experimental work has led to important advances in the physics of Self-Amplified Spontaneous Emission free-electron-lasers (SASE-FELs), and in the production of high brightness, high energy electron beams. This work has made possible the design and construction of X-ray FELs at a few to 0.1 nm. The X-ray FEL has the characteristics required for a ''4th Generation Light Source'': diffraction limited radiation, subpicosecond pulse length, peak and average brightness largely exceeding that of 3rd generation sources. We review the status of SASE-FELs, and of the X-ray FEL projects.
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title: Laminar flow in non-relativistic intense proton beams
format: conference proceeding
conference: EPAC 1998
year: 1998
2 authors: L. Serafini | J.B. Rosenzweig
abstract: An approach to the envelope description of laminar non-relativistic particle beams is presented, which describes a new kind of equilibrium flow for strongly space charge dominated proton beams subject to acceleration in RF Linacs. The analysis is based on the extension of the invariant envelope concept, recently introduced in the field of RF photo-injectors[1], to nonrelativistic particle beams whose envelope is dominated by coherent plasma oscillations instead of incoherent betatron motion associated to thermal rms emittance. An exact analytical solution of the rms envelope equation is presented, describing both the laminar regime and the transition to the thermal regime: the impact of this new beam equilibrium on the design of high intensity Linacs is discussed.
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title: A High Voltage Extractor with Photocathodes
format: conference proceeding
conference: EPAC 1998
year: 1999
7 authors: G. Travish | D. Giove | P. Michelato | C. Pagani | P. Pierini | L. Serafini | D. Sertore
abstract: We describe a system designed for photocathode testing and beam dynamics studies which is based on a high voltage extractor and a sub–ps drive laser. The system’s distinctive characteristics are the ability to run in the short bunch regime — where the dynamics are not governed by the Child–Langmuir law — and the anticipated availability of both transverse and longitudinal beam diagnostics to determine the full beam distribution. The system consists of a pseudo parallel plate 100 kV DC gun with a removable cathode and a cathode–anode gap of 8 mm, yielding a cathode field of up to 10 MV/m. The drive laser is a Nd:Glass system capable of producing over 200 ?J at 264 nm with a pulse length adjustable from approximately 250 fs to over 1 ps. The goals of the system, described in this paper, are to support ongoing photocathode studies, including measuring high current density extraction from prepared cathodes and investigating the effect of surface variation of the quantum efficiency. Additional studies foreseen include parameterizing the effect of surface variations on the transverse emittance, and exploring beam dynamics such as the short bunch blow out regime which has recently been proposed as a way to produce uniform ellipsoidal charge density distributions[1].
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