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Title: AC orbit bump method of local impedance measurement

Abstract

A fast and precise technique of local impedance measurement has been developed and tested at NSLS-II. This technique is based on in-phase sine-wave (AC) excitation of four fast correctors adjacent to the vacuum chamber section, impedance of which is measured. The beam position is measured using synchronous detection. Use of the narrow-band sine-wave signal allows us to improve significantly the accuracy of the orbit bump method. Beam excitation by fast correctors results in elimination of the systematic error caused by hysteresis effect. The systematic error caused by orbit drift is also eliminated because the measured signal is not affected by the orbit motion outside the excitation frequency range. In this article, the measurement technique is described and the result of proof-of-principle experiment carried out at NSLS-II is presented.

Authors:
 [1];  [1];  [1];  [1];  [1]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1413911
Report Number(s):
BNL-114332-2017-JA
Journal ID: ISSN 0168-9002; TRN: US1800471
Grant/Contract Number:  
SC0012704
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment
Additional Journal Information:
Journal Volume: 871; Journal Issue: C; Journal ID: ISSN 0168-9002
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; cyclic accelerators; storage rings; NSLS-II; beam dynamics; National Synchrotron Light Source II

Citation Formats

Smaluk, Victor, Yang, Xi, Blednykh, Alexei, Tian, Yuke, and Ha, Kiman. AC orbit bump method of local impedance measurement. United States: N. p., 2017. Web. doi:10.1016/j.nima.2017.07.067.
Smaluk, Victor, Yang, Xi, Blednykh, Alexei, Tian, Yuke, & Ha, Kiman. AC orbit bump method of local impedance measurement. United States. doi:10.1016/j.nima.2017.07.067.
Smaluk, Victor, Yang, Xi, Blednykh, Alexei, Tian, Yuke, and Ha, Kiman. Fri . "AC orbit bump method of local impedance measurement". United States. doi:10.1016/j.nima.2017.07.067. https://www.osti.gov/servlets/purl/1413911.
@article{osti_1413911,
title = {AC orbit bump method of local impedance measurement},
author = {Smaluk, Victor and Yang, Xi and Blednykh, Alexei and Tian, Yuke and Ha, Kiman},
abstractNote = {A fast and precise technique of local impedance measurement has been developed and tested at NSLS-II. This technique is based on in-phase sine-wave (AC) excitation of four fast correctors adjacent to the vacuum chamber section, impedance of which is measured. The beam position is measured using synchronous detection. Use of the narrow-band sine-wave signal allows us to improve significantly the accuracy of the orbit bump method. Beam excitation by fast correctors results in elimination of the systematic error caused by hysteresis effect. The systematic error caused by orbit drift is also eliminated because the measured signal is not affected by the orbit motion outside the excitation frequency range. In this article, the measurement technique is described and the result of proof-of-principle experiment carried out at NSLS-II is presented.},
doi = {10.1016/j.nima.2017.07.067},
journal = {Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment},
number = C,
volume = 871,
place = {United States},
year = {Fri Aug 04 00:00:00 EDT 2017},
month = {Fri Aug 04 00:00:00 EDT 2017}
}

Journal Article:
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