| Paper |
Title |
Page |
| TUPWC01 |
The Application of Direct RF Sampling System on Cavity BPM Signal Processing |
278 |
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- L.W. Lai, F.Z. Chen, Y.B. Leng, T. Wu, L.Y. Yu, R.X. Yuan
SSRF, Shanghai, People's Republic of China
- S.S. Cao, J. Chen, J. Chen, Y.B. Leng, T.J. Shen, L.Y. Yu, R.X. Yuan
SINAP, Shanghai, People's Republic of China
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Cavity BPM signal processing system normally consists of two modules, first one is RF conditioning module to down convert the BPM signal to IF, second one is IF signal digitizer and digital signal processing module. The conditioning module complicates the system and introduce noise. A direct RF sampling system has been constructed to process the cavity BPM signal, which structure is more concise and performance is more stable compared to the conventional system. The platform and test results will be introduced in this paper.
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| DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IBIC2017-TUPWC01
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| WEPCF01 |
Beam Charge Measurement Using the Method of Double-Cavity Mixing |
411 |
| |
- 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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| TUPCC18 |
Beam Arrival Time Measurement at SXFEL |
193 |
| |
- S.S. Cao, J. Chen, Y.B. Leng
SINAP, Shanghai, People's Republic of China
- R.X. Yuan
SSRF, Shanghai, People's Republic of China
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Shanghai Soft X-ray Free Electron Laser (SXFEL) is a fourth-generation light source which could provide coherent X-rays for various scientific researches. One of the key issues of its operation is the measurement of bunch arrival time which is important for the synchronization of a bunch and seeded laser. The measurement utilized a newly designed beam arrival time monitor (BAM) which contains two cavities at a different frequency. Thus a new way, dual-cavities mixing method, is applied in this experiment to evaluate the beam arrival time resolution. In this paper, we presented the scheme and different measured resolution of various measurement methods and evaluated the stability of the new monitor.
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| DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IBIC2017-TUPCC18
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