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Beam experiments in the extreme space-charge limit on the University of Maryland Electron Ring

Phys. Plasmas 11, 2907 (2004); doi:10.1063/1.1668288

Published 23 April 2004

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S. Bernal, H. Li, T. Godlove, I. Haber, R. A. Kishek, B. Quinn, M. Reiser, M. Walter, Y. Zou, and P. G. O'Shea
Institute for Research in Electronics and Applied Physics, University of Maryland, College Park, Maryland 20742
The University of Maryland Electron Ring (UMER), designed for transport studies of space-charge dominated beams in a strong focusing lattice, is nearing completion. UMER models, for example, the recirculator accelerator envisioned as a possible driver for heavy-ion inertial fusion. The UMER lattice will consist of 36 alternating-focusing (FODO) periods over an 11.5 m circumference. The main diagnostics are phosphor screens and capacitive beam position monitors placed at the center of each 20° bending section. In addition, pepper-pot and slit-wire emittance meters are in operation. We present experimental results for three cases of strong space-charge dominated transport (7.2, 24, and 85 mA, at 10 keV) and contrast them with one case in the emittance-dominated regime (0.6 mA at 10 keV). With focusing given by sigma0 = 76°, the zero-current betatron phase advance per period, the range of currents corresponds to a space-charge tune depression of 0.2 to 0.8. This range is unprecedented for a circular machine. The beam physics over three transport distances is considered: at or near the source, over the length of the matching section (about 1 m), and single turn (10 m). Issues associated with beam characterization, scaling of various parameters, alignment, and envelope matching are discussed. ©2004 American Institute of Physics.
History: Received 30 October 2003; accepted 16 January 2004; published 23 April 2004
Permalink: http://link.aip.org/link/?PHPAEN/11/2907/1
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KEYWORDS and PACS

Keywords
PACS
  • 52.40.Mj
    Particle beam interactions in plasmas
  • 29.27.Eg
    Beam handling; beam transport in accelerators
  • 52.25.Fi
    Plasma transport properties
  • 52.70.Kz
    Optical (ultraviolet, visible, infrared) plasma diagnostic measurements
  • 29.20.Fj
    Betatrons
  • 52.80.-s
    Electric discharges
  • YEAR: 2004

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ISSN:
1070-664X (print)   1089-7674 (online)
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REFERENCES (31)
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