Phys. Rev. ST Accel. Beams 5, 072801 (2002) [7 pages]Compact high-resolution retarding field energy analyzer for space-charge-dominated electron beams |
Y. Zou, Y. Cui, V. Yun, A. Valfells, R. A. Kishek, S. Bernal, I. Haber, M. Reiser, and P. G. O'Shea
Institute for Research in Electronics and Applied Physics, University of Maryland, College Park, Maryland 20742
J. G. Wang
SNS, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
Received 22 April 2002; published 5 July 2002
We have developed a compact high-resolution retarding field energy analyzer for measuring the energy spread of space-charge-dominated electron beams. This energy analyzer has a cylindrical electrode to overcome the defocusing effects due to space-charge forces, beam trajectories, aperture effect, etc. The device provides excellent spatial and temporal information on the beam energy spread. Single-particle simulation shows that this energy analyzer has very good resolution for low-energy electron beams of several kilovolts and with large divergence angles. The energy analyzer has been tested with 2.5 keV, 60 mA electron beams. The measured energy spread is also compared with the theoretical calculations taking into account two main energy spread sources, namely, the Boersch effect and the longitudinal-longitudinal relaxation.
©2002 The American Physical Society
URL: http://link.aps.org/abstract/PRSTAB/v5/e072801
DOI: 10.1103/PhysRevSTAB.5.072801
PACS: 29.30.Dn, 29.27.Fh, 29.17.+w
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