New aspects of longitudinal instabilities in electron storage rings

被引：5

作者：

Blednykh, A. ^{[1
]}

Bacha, B. ^{[1
]}

Bassi, G. ^{[1
]}

Cheng, W. ^{[1
]}

Chubar, O. ^{[1
]}

Derbenev, A. ^{[1
]}

Lindberg, R. ^{[2
]}

Rakitin, M. ^{[1
]}

Smaluk, V. ^{[1
]}

Zhernenkov, M. ^{[1
]}

Chen-Wiegart, Yu-chen Karen ^{[1
,3
]}

Wiegart, L. ^{[1
]}

机构：

[1] Brookhaven Natl Lab, Upton, NY 11973 USA

[2] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA

[3] SUNY Stony Brook, Dept Mat Sci & Chem Engn, Stony Brook, NY 11794 USA

来源：

SCIENTIFIC REPORTS | 2018年 / 8卷

关键词：

D O I：

10.1038/s41598-018-30306-y

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

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.

引用

页数：8

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