IBIC2015 - List of Authors (Leng, Y.B.)

Paper	Title	Page
MOPB030	Time Measurement Method Based on CPLD for Beam Loss Position Monitor	98
	Y. Yang, Y.B. Leng, Y.B. Yan SSRF, Shanghai, People's Republic of China
	Beam loss position is of great concern at SSRF. Time measurement is one of the key technologies for beam loss position monitor. This paper introduces a time measurement method based on Complex Programmable Logic Device (CPLD). Simulation has been done to verify the performance of this method.
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TUPB035	Bunch-by-Bunch Study of the Transient State of Injection at the SSRF	396
	Z.C. Chen, Y.B. Leng SSRF, Shanghai, People's Republic of China
	Funding: National Natural Science Foundation of China (No. 11305253) High current and stable beams are preferred to a light source, so the suppression of the oscillations due to the frequent injections during top-off operations get the attention at the Shanghai Synchrotron Radiation Facility (SSRF). To evaluate the possibility of further optimizations, a bunch-by-bunch position monitor is used to study the behavior of the injected bunch. The injected part is isolated from the stored one by decomposing the position matrix of all the bunches in the storage ring. Frequency feature, motion lifetime and other characteristic parameters of the injection mode have been compared with those of the stored mode.
	Poster TUPB035 [0.567 MB]
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TUPB036	Progress of Cavity Beam Position Monitor at SXFEL	399
	L.W. Lai, Z.C. Chen, Y.B. Leng, Y.B. Yan, L.Y. Yu, R.X. Yuan, W.M. Zhou SSRF, Shanghai, People's Republic of China
	Shanghai Soft X-ray FEL Test Facility (SXFEL) has started the infrastructure construction in 2015. All beam diagnostic systems are under processing and measurement, including C-band Low-Q cavity BPMs. This paper presents the progress of the cavity BPM system, including design and the measurements on a lab platform. Measurements shown that the cavity BPM frequency is 4.7GHz±8MHz, and the complete test platform verify that the cavity BPM system, which including signal processing electronics can work as expected. * Work supported by National Natural Science Foundation (No. 11305253, 11375255)
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TUPB037	Interferometer Data Analyzing Using the PCA Method at SSRF	402
	Y.B. Leng, H.J. Chen, J. Chen, Z.C. Chen, Y.B. Yan SSRF, Shanghai, People's Republic of China
	An SR interferometer, which was used to monitor the transverse beam size in the SSRF ring, had been implemented and put into operation since 2009. The direct projection and curve fitting was adopted for raw image data processing. Any CCD alignment error could introduce some beam size measurement error in this case. Using primary component analyzing (PCA) method to process raw image data, the horizontal and vertical distribution information can be decoupled and the misalignment information of CCD can be derived. Beam experiment results will be discussed in this paper.
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Paper

Title

Page

Time Measurement Method Based on CPLD for Beam Loss Position Monitor

98

Y. Yang, Y.B. Leng, Y.B. Yan
SSRF, Shanghai, People's Republic of China

Beam loss position is of great concern at SSRF. Time measurement is one of the key technologies for beam loss position monitor. This paper introduces a time measurement method based on Complex Programmable Logic Device (CPLD). Simulation has been done to verify the performance of this method.

Export •

reference for this paper to ※ BibTeX, ※ LaTeX, ※ Text, ※ RIS/RefMan, ※ EndNote (xml)

TUPB035

Bunch-by-Bunch Study of the Transient State of Injection at the SSRF

396

Z.C. Chen, Y.B. Leng
SSRF, Shanghai, People's Republic of China

Funding: National Natural Science Foundation of China (No. 11305253)
High current and stable beams are preferred to a light source, so the suppression of the oscillations due to the frequent injections during top-off operations get the attention at the Shanghai Synchrotron Radiation Facility (SSRF). To evaluate the possibility of further optimizations, a bunch-by-bunch position monitor is used to study the behavior of the injected bunch. The injected part is isolated from the stored one by decomposing the position matrix of all the bunches in the storage ring. Frequency feature, motion lifetime and other characteristic parameters of the injection mode have been compared with those of the stored mode.

Poster TUPB035 [0.567 MB]

Export •

reference for this paper to ※ BibTeX, ※ LaTeX, ※ Text, ※ RIS/RefMan, ※ EndNote (xml)

TUPB036

Progress of Cavity Beam Position Monitor at SXFEL

399

L.W. Lai, Z.C. Chen, Y.B. Leng, Y.B. Yan, L.Y. Yu, R.X. Yuan, W.M. Zhou
SSRF, Shanghai, People's Republic of China

Shanghai Soft X-ray FEL Test Facility (SXFEL) has started the infrastructure construction in 2015. All beam diagnostic systems are under processing and measurement, including C-band Low-Q cavity BPMs. This paper presents the progress of the cavity BPM system, including design and the measurements on a lab platform. Measurements shown that the cavity BPM frequency is 4.7GHz±8MHz, and the complete test platform verify that the cavity BPM system, which including signal processing electronics can work as expected.
* Work supported by National Natural Science Foundation (No. 11305253, 11375255)

Export •

reference for this paper to ※ BibTeX, ※ LaTeX, ※ Text, ※ RIS/RefMan, ※ EndNote (xml)

TUPB037

Interferometer Data Analyzing Using the PCA Method at SSRF

402

Y.B. Leng, H.J. Chen, J. Chen, Z.C. Chen, Y.B. Yan
SSRF, Shanghai, People's Republic of China

An SR interferometer, which was used to monitor the transverse beam size in the SSRF ring, had been implemented and put into operation since 2009. The direct projection and curve fitting was adopted for raw image data processing. Any CCD alignment error could introduce some beam size measurement error in this case. Using primary component analyzing (PCA) method to process raw image data, the horizontal and vertical distribution information can be decoupled and the misalignment information of CCD can be derived. Beam experiment results will be discussed in this paper.

Export •

reference for this paper to ※ BibTeX, ※ LaTeX, ※ Text, ※ RIS/RefMan, ※ EndNote (xml)