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Electron cloud dynamics in the Cornell Electron Storage Ring Test Accelerator wiggler

Celata, C. M. (2011) Electron cloud dynamics in the Cornell Electron Storage Ring Test Accelerator wiggler. Physical review special topics. Accelerators and beams, 14 (4). Art. No. 041003. ISSN 1098-4402.

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The interference of stray electrons (also called “electron clouds”) with accelerator beams is important in modern intense-beam accelerators, especially those with beams of positive charge. In magnetic wigglers, used, for instance, for transverse emittance damping, the intense synchrotron radiation produced by the beam can generate an electron cloud of relatively high density. In this paper the complicated dynamics of electron clouds in wigglers is examined using the example of a wiggler in the Cornell Electron Storage Ring Test Accelerator experiment at the Cornell Electron Storage Ring. Three-dimensional particle-in-cell simulations with the WARP-POSINST computer code show different density and dynamics for the electron cloud at locations near the maxima of the vertical wiggler field when compared to locations near the minima. Dynamics in these regions, the electron cloud distribution vs longitudinal position, and the beam coherent tune shift caused by the wiggler electron cloud will be discussed.

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Additional Information:© 2011 American Physical Society. Published by American Physical Society under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Received 6 July 2010; published 7 April 2011. The author would like to acknowledge insightful suggestions from Gregory Penn of Lawrence Berkeley National Laboratory concerning the movement of electrons near the field null. Gerald Dugan (Cornell University) was extremely helpful in explaining the tune shift calculation method which best models the CESR-TA "pinged-beam" measurement. The author would like to thank Mark Palmer and the members of the CESR-TA group at Cornell and the electron cloud group in the Center for Beam Physics at LBNL for feedback and suggestions during the course of this work and for their fine collaborative spirit. Finally, this paper would not have been possible without coding and support from David Grote and Jean Luc Vay, developers of the WARP code, who gave generously of their time and skill. This work was supported by the National Science Foundation under Contract No. PHY-0734867 and the Office of Science, U.S. Department of Energy, under Contract No. DE-FC02- 08ER41538.
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Department of Energy (DOE) Office of ScienceDE-FC02-08ER41538
Issue or Number:4
Classification Code:PACS: 29.27.-a, 41.75.Ht
Record Number:CaltechAUTHORS:20110502-090333090
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:23512
Deposited By: Tony Diaz
Deposited On:11 May 2011 17:13
Last Modified:03 Oct 2019 02:47

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