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Title: New aspects of longitudinal instabilities in electron storage rings

Abstract

Here, novel features of the longitudinal instability of a single electron bunch circulating in a low-emittance electron storage ring are discussed. Measurements and numerical simulations, performed both in time and frequency domain, show a non-monotonic increase of the electron beam energy spread as a function of single bunch current, characterized by the presence of local minima and maxima, where a local minimum of the energy spread is interpreted as a higher-order microwave instability threshold. It is also shown that thresholds related to the same zero-intensity bunch length depend linearly on the accelerating radio frequency voltage. The observed intensity-dependent features of the energy spread, confirmed by measurements with two independent diagnostics methods, i.e. horizontal beam profile measurements by a synchrotron light monitor and photon energy spectrum measurements of undulator radiation, are given a theoretical interpretation by applying a novel eigenvalue analysis based on the linearized Vlasov equation.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [2];  [1];  [1]; ORCiD logo [1];  [3];  [1]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States)
  2. Argonne National Lab. (ANL), Argonne, IL (United States)
  3. Brookhaven National Lab. (BNL), Upton, NY (United States); Stony Brook Univ., Stony Brook, NY (United States)
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1477959
Report Number(s):
[BNL-209191-2018-JAAM]
[Journal ID: ISSN 2045-2322]
Grant/Contract Number:  
[SC0012704]
Resource Type:
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
[ Journal Volume: 8; Journal Issue: 1]; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS

Citation Formats

Blednykh, Alexei, Bacha, B., Bassi, G., Cheng, W., Chubar, O., Derbenev, A., Lindberg, R., Rakitin, M., Smaluk, V., Zhernenkov, M., Chen-Wiegart, Yu-chen Karen, and Wiegart, L. New aspects of longitudinal instabilities in electron storage rings. United States: N. p., 2018. Web. doi:10.1038/s41598-018-30306-y.
Blednykh, Alexei, Bacha, B., Bassi, G., Cheng, W., Chubar, O., Derbenev, A., Lindberg, R., Rakitin, M., Smaluk, V., Zhernenkov, M., Chen-Wiegart, Yu-chen Karen, & Wiegart, L. New aspects of longitudinal instabilities in electron storage rings. United States. doi:10.1038/s41598-018-30306-y.
Blednykh, Alexei, Bacha, B., Bassi, G., Cheng, W., Chubar, O., Derbenev, A., Lindberg, R., Rakitin, M., Smaluk, V., Zhernenkov, M., Chen-Wiegart, Yu-chen Karen, and Wiegart, L. Thu . "New aspects of longitudinal instabilities in electron storage rings". United States. doi:10.1038/s41598-018-30306-y. https://www.osti.gov/servlets/purl/1477959.
@article{osti_1477959,
title = {New aspects of longitudinal instabilities in electron storage rings},
author = {Blednykh, Alexei and Bacha, B. and Bassi, G. and Cheng, W. and Chubar, O. and Derbenev, A. and Lindberg, R. and Rakitin, M. and Smaluk, V. and Zhernenkov, M. and Chen-Wiegart, Yu-chen Karen and Wiegart, L.},
abstractNote = {Here, novel features of the longitudinal instability of a single electron bunch circulating in a low-emittance electron storage ring are discussed. Measurements and numerical simulations, performed both in time and frequency domain, show a non-monotonic increase of the electron beam energy spread as a function of single bunch current, characterized by the presence of local minima and maxima, where a local minimum of the energy spread is interpreted as a higher-order microwave instability threshold. It is also shown that thresholds related to the same zero-intensity bunch length depend linearly on the accelerating radio frequency voltage. The observed intensity-dependent features of the energy spread, confirmed by measurements with two independent diagnostics methods, i.e. horizontal beam profile measurements by a synchrotron light monitor and photon energy spectrum measurements of undulator radiation, are given a theoretical interpretation by applying a novel eigenvalue analysis based on the linearized Vlasov equation.},
doi = {10.1038/s41598-018-30306-y},
journal = {Scientific Reports},
number = [1],
volume = [8],
place = {United States},
year = {2018},
month = {8}
}

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