| Paper |
Title |
Page |
| TUPWC02 |
Three-Dimensional Bunch-by-Bunch Position Measurement at SSRF |
281 |
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- Y.M. Zhou, N. Zhang
SSRF, Shanghai, People's Republic of China
- L.W. Duan, Y.B. Leng
SINAP, Shanghai, People's Republic of China
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Measurement of the bunch-by-bunch particle beam position related to dynamic instability is a useful input to accelerator optimization. And the bunch-by-bunch information has been contained in the BPM signals, including bunch charge, transverse position and longitudinal phase information. This paper reports a 3D beam position monitor system based on a high speed digital oscilloscope, which has been used to capture three-dimensional position information during the injection transient at the Shanghai Synchrotron Radiation Facility. With this information the traces of stored bunch and refilled bunch, and the mismatch of energy, transverse position and longitudinal phase between them can be precisely retrieved. The progress of this work and several particular experimental results will be discussed in this paper. The details of data processing method so-called software re-sampling technique will be discussed as well.
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Poster TUPWC02 [0.924 MB]
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| DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IBIC2017-TUPWC02
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| WEPCF01 |
Beam Charge Measurement Using the Method of Double-Cavity Mixing |
411 |
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- J. Chen, S.S. Cao, L.W. Lai, Y.B. Leng, R.X. Yuan
SINAP, Shanghai, People's Republic of China
- N. Zhang
SSRF, Shanghai, People's Republic of China
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The measurement of beam charge is a fundamental re-quirement to all particle accelerators facility. In this paper, using the TM010 mode of the cavity BPM to measure the beam charge will be introduced. The data processing methods including harmonic analysis, time domain analysis and principle component analysis (PCA) are used and compared in evaluating the resolution of the beam charge. On the basis of this, the results of the evaluation at a ultra-low charge are also given and indicates the superiority of the cavity probe in the measurement of lower beam charge. In addition, the use of double-cavity mixing method to measure the beam charge will be proposed as well.
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| DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IBIC2017-WEPCF01
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| TH2AB2 |
Bunch-by-Bunch Beam Length Measurement Using Two-Frequency System at SSRF |
499 |
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- H.J. Chen, L.W. Duan, B. Gao, L.W. Lai, Y.B. Leng
SINAP, Shanghai, People's Republic of China
- N. Zhang
SSRF, Shanghai, People's Republic of China
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A Two-frequency method has been implemented for bunch length measurement at Shanghai Synchrotron Radiation Facility (SSRF). It is based on the information from two harmonic frequencies of Flourier Transformation of longitudinal charge distribution. We select 500MHz and 3GHz as working frequency and the system consists of power splitters, band-pass filters and a mixer. Raw data are acquired by a digital oscilloscope and analyzed by MATLAB code. The system has been calibrated by Streak Camera in single-bunch experiment environment with bunch charge from 0.23nC to 6.05nC. The paper also shows bunch length synchronous oscillation phenomenon during injection period.
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Slides TH2AB2 [3.638 MB]
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| DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IBIC2017-TH2AB2
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