Simulation of Multipacting with Space Charge Effect
American Journal of Physics and Applications
Volume 5, Issue 6, November 2017, Pages: 99-105
Received: Aug. 11, 2017; Accepted: Sep. 25, 2017; Published: Nov. 6, 2017
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Author
Gennady Romanov, Fermi National Accelerator Laboratory, Batavia, Illinois, USA
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Abstract
The electron multiplication on surfaces exposed to an oscillating electromagnetic field causes the phenomenon of multipacting, which can degrade significantly the performance of vacuum RF devices, especially accelerating cavities. It is a serious obstacle to be avoided for normal operation of particle accelerator and their RF components. Many types of room temperature and superconducting accelerating cavities are designed and produced at Fermilab for different projects. The extensive simulations of multipacting in the cavities with updated material properties and comparison of the simulation results with experimental data are routinely performed during electromagnetic design of the cavities. The new advanced computing capabilities made it possible to take the space charge effect into account in the multipacting simulations. The basic new features of multipacting process that appear due to the space charge effect are shown for the classic case of the parallel plates and discussed. As the first practical application of the multipacting simulations with space charge effect the study of multipacting in the low-beta and high-beta 650 MHz elliptical superconducting cavities is also presented.
Keywords
Multipacting, Accelerator, Cavity, Secondary Emission, Space Charge
To cite this article
Gennady Romanov, Simulation of Multipacting with Space Charge Effect, American Journal of Physics and Applications. Vol. 5, No. 6, 2017, pp. 99-105. doi: 10.11648/j.ajpa.20170506.15
Copyright
Copyright © 2017 Authors retain the copyright of this article.
This article is an open access article distributed under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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