| Title |
Direct Observations of Sub-micropulse Electron-beam Effects from Short-range Wakefields in TESLA-type Superconducting RF Cavities |
| Authors |
- A.H. Lumpkin, D.R. Edstrom, P.S. Prieto, J. Ruan, R.M. Thurman-Keuppresenter
Fermilab, Batavia, Illinois, USA
- J.A. Diaz Cruz, A.L. Edelen, B.T. Jacobson, F. Zhou
SLAC, Menlo Park, California, USA
|
| Abstract |
The preservation of the low emittance of electron beams during transport in the accelerating structures of large facilities is an ongoing challenge. In the cases of the TESLA-type superconducting rf cavities currently used in the European X-ray Free-electron Laser (FEL) and the under construction Linac Coherent Light Source upgrade (LCLS-II), off-axis beam transport may result in emittance dilution due to transverse long-range and short-range wakefields (SRW)*. To investigate such effects, experiments were performed at the Fermilab Accelerator Science and Technology (FAST) facility with its unique two-cavity configuration after the photocathode rf gun. We used optical transition radiation (OTR) imaging with a UV-visible synchroscan streak camera to display sub-micropulse y-t effects in the 41-MeV beam. The head-tail transverse kicks within the 11-ps-long micropulses were observed at the 100-micron level for steering off-axis in one cavity and several 100 microns for two cavities. Since the SRW kick angles go inversely with energy, these results may inform the commissioning plans of the LCLS-II injector where beam will be injected at ~1 MeV into a cryomodule.
|
| Footnotes & References |
* W.K.H. Panofsky and M. Bander, Rev. Sci. Instr. 39 , 206 (1968). |
| Funding |
Work supported by FRA, LLC under Contract No. DE-AC02-07CH11359 with the U.S. Dept. of Energy, Off. of Sci./HEP. SLAC is supported by the U.S. Dept. of Energy, OS/BES, under contract DE-AC02-76SF00515. |
| Paper |
download TUPP17.PDF [0.916 MB / 5 pages] |
| Poster |
download TUPP17_POSTER.PDF [0.497 MB] |
| Export |
download ※ BibTeX
※ LaTeX
※ Text/Word
※ RIS
※ EndNote |
| Conference |
IBIC2020 |
| Series |
International Beam Instrumentation Conference (9th) |
| Location |
Santos, Brazil |
| Date |
14-18 September 2020 |
| Publisher |
JACoW Publishing, Geneva, Switzerland |
| Editorial Board |
Daniel Tavares (LNLS, Campinas, Brazil); Renan Picoreti (LNLS, Campinas, Brazil); Gustavo Bruno (LNLS, Campinas, Brazil); Sergio Marques (LNLS, Campinas, Brazil); Volker R.W. Schaa (GSI, Darmstadt, Germany) |
| Online ISBN |
978-3-95450-222-6 |
| Online ISSN |
2673-5350 |
| Received |
31 August 2020 |
| Accepted |
31 October 2020 |
| Issue Date |
30 October 2020 |
| DOI |
doi:10.18429/JACoW-IBIC2020-TUPP17 |
| Pages |
56-60 |
| Copyright |
 Published by JACoW Publishing under the terms of the Creative Commons Attribution 3.0 International license. Any further distribution of this work must maintain attribution to the author(s), the published article's title, publisher, and DOI. |
|
