IBIC2021 - List of Authors (Cao, S.S.)

Paper	Title	Page
MOPP09	Research on the Optimal Amplitude Extraction Algorithm for Cavity BPM	48
	J. Chen, Y.B. Leng, T. Wu, Y.M. Zhou SSRF, Shanghai, People’s Republic of China S.S. Cao, B. Gao SARI-CAS, Pudong, Shanghai, People’s Republic of China
	The wake field of different modes of cavity BPM carries different bunch information, the amplitude and phase of the signals of different modes can be extracted through the signal processing method to obtain the characteristic parameters of the source bunch. In the application of bunch charge and position measurement, the accurate amplitude extraction method for cavity BPM signal is the primary issue to be considered when designing the data acquisition and processing system. In this paper, through theoretical analysis and numerical simulation, it is proved that the optimal algorithm of amplitude extraction for CBPM exists, and the dependence between the data processing window size and the decay time of the cavity BPM under the optimal design is given. In addition, the relationship between the optimized amplitude extraction uncertainty and the noise-to-signal ratio, sampling rate of data acquisition and processing system, and the decay time of the cavity BPM is also proposed, which can also provide clear guidance for the design and optimization of the CBPM system.
	Poster MOPP09 [0.538 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2021-MOPP09
About •	paper received ※ 08 September 2021 paper accepted ※ 17 September 2021 issue date ※ 04 October 2021
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MOPP12	Development of an X-Band CBPM Prototype for SHINE	56
	S.S. Cao SARI-CAS, Pudong, Shanghai, People’s Republic of China R. Jiang, Y.B. Leng, R.X. Yuan SSRF, Shanghai, People’s Republic of China
	SHINE is a newly proposed high-repetition-rate X-ray FEL facility and will be used to generate brilliant X-rays between 0.4 and 0.25 keV. To guarantee the high performance of FEL light pulses, it put a strict requirement on the monitoring of electron bunch trajectory. The position resolution of each bunch at the undulator section is required to be better than 200 nm at a bunch charge of 100 pC. The cavity beam position monitor (CBPM) is widely used in FEL facilities for its unique high resolution and high sensitivity. The output signals of an ideal pillbox cavity are proportional to the resonant frequency. Compared with the C-band cavity, the X-band cavity is expected to have a higher signal-to-noise ratio which is especially helpful at low bunch charge. Therefore, an X-band CBPM prototype is developed for SHINE. This paper will focus on the difficulties encountered during the design and production process and the solutions.
	Poster MOPP12 [1.221 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2021-MOPP12
About •	paper received ※ 08 September 2021 paper accepted ※ 17 September 2021 issue date ※ 10 October 2021
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPP13	Bunch Arrival Time Measurement System Test for SHINE	396
	Y.M. Zhou, J. Chen, Y.B. Leng SSRF, Shanghai, People’s Republic of China S.S. Cao SARI-CAS, Pudong, Shanghai, People’s Republic of China
	To achieve high-precision synchronization between electron bunches and seeded lasers, a femto-second resolution bunch arrival time measurement system (BAM) is required at SHINE (Shanghai High repetition rate XFEL aNd Extreme light facility). The bunch signal from a GHz-bandwidth cavity monitor is mixed with a reference signal from the device synchronization clock in the RF front-end. Then, the generated IF signal is collected by the digital acquisition system. In the pre-research stage, four sets of cavity monitors with different frequencies and load quality factors and three sets of analog front-ends with different schemes were performed, but now only one monitor with the attenuation time constant of 200 ns was installed for beam experiment testing. The system can measure the bunch charge, bunch arrival time, and bunch flight time. The first results will be presented in this paper.
	Poster WEPP13 [1.776 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2021-WEPP13
About •	paper received ※ 08 September 2021 paper accepted ※ 01 October 2021 issue date ※ 13 October 2021
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

Research on the Optimal Amplitude Extraction Algorithm for Cavity BPM

48

J. Chen, Y.B. Leng, T. Wu, Y.M. Zhou
SSRF, Shanghai, People’s Republic of China
S.S. Cao, B. Gao
SARI-CAS, Pudong, Shanghai, People’s Republic of China

The wake field of different modes of cavity BPM carries different bunch information, the amplitude and phase of the signals of different modes can be extracted through the signal processing method to obtain the characteristic parameters of the source bunch. In the application of bunch charge and position measurement, the accurate amplitude extraction method for cavity BPM signal is the primary issue to be considered when designing the data acquisition and processing system. In this paper, through theoretical analysis and numerical simulation, it is proved that the optimal algorithm of amplitude extraction for CBPM exists, and the dependence between the data processing window size and the decay time of the cavity BPM under the optimal design is given. In addition, the relationship between the optimized amplitude extraction uncertainty and the noise-to-signal ratio, sampling rate of data acquisition and processing system, and the decay time of the cavity BPM is also proposed, which can also provide clear guidance for the design and optimization of the CBPM system.

Poster MOPP09 [0.538 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2021-MOPP09

About •

paper received ※ 08 September 2021 paper accepted ※ 17 September 2021 issue date ※ 04 October 2021

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPP12

Development of an X-Band CBPM Prototype for SHINE

56

S.S. Cao
SARI-CAS, Pudong, Shanghai, People’s Republic of China
R. Jiang, Y.B. Leng, R.X. Yuan
SSRF, Shanghai, People’s Republic of China

SHINE is a newly proposed high-repetition-rate X-ray FEL facility and will be used to generate brilliant X-rays between 0.4 and 0.25 keV. To guarantee the high performance of FEL light pulses, it put a strict requirement on the monitoring of electron bunch trajectory. The position resolution of each bunch at the undulator section is required to be better than 200 nm at a bunch charge of 100 pC. The cavity beam position monitor (CBPM) is widely used in FEL facilities for its unique high resolution and high sensitivity. The output signals of an ideal pillbox cavity are proportional to the resonant frequency. Compared with the C-band cavity, the X-band cavity is expected to have a higher signal-to-noise ratio which is especially helpful at low bunch charge. Therefore, an X-band CBPM prototype is developed for SHINE. This paper will focus on the difficulties encountered during the design and production process and the solutions.

Poster MOPP12 [1.221 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2021-MOPP12

About •

paper received ※ 08 September 2021 paper accepted ※ 17 September 2021 issue date ※ 10 October 2021

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPP13

Bunch Arrival Time Measurement System Test for SHINE

396

Y.M. Zhou, J. Chen, Y.B. Leng
SSRF, Shanghai, People’s Republic of China
S.S. Cao
SARI-CAS, Pudong, Shanghai, People’s Republic of China

To achieve high-precision synchronization between electron bunches and seeded lasers, a femto-second resolution bunch arrival time measurement system (BAM) is required at SHINE (Shanghai High repetition rate XFEL aNd Extreme light facility). The bunch signal from a GHz-bandwidth cavity monitor is mixed with a reference signal from the device synchronization clock in the RF front-end. Then, the generated IF signal is collected by the digital acquisition system. In the pre-research stage, four sets of cavity monitors with different frequencies and load quality factors and three sets of analog front-ends with different schemes were performed, but now only one monitor with the attenuation time constant of 200 ns was installed for beam experiment testing. The system can measure the bunch charge, bunch arrival time, and bunch flight time. The first results will be presented in this paper.

Poster WEPP13 [1.776 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2021-WEPP13

About •

paper received ※ 08 September 2021 paper accepted ※ 01 October 2021 issue date ※ 13 October 2021

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)