IPAC2018 - List of Authors (Zheng, Q.)

Paper	Title	Page
THPAK106	400 MHz Frequency/phase Detector and Counter	3481
	X.L. Fu, B. Ji, Z.G. Yin, T.J. Zhang CIAE, Beijing, People's Republic of China G. Dennison UBC & TRIUMF, Vancouver, British Columbia, Canada K. Fong, M.P. Laverty, Q. Zheng TRIUMF, Vancouver, Canada
	To enhance the performance and precision of TRIUMF Low Level RF system, a frequency/phase detector and counter based on FPGA is developed. The frequency/phase detector and counter is designed as a daughter board of the low level RF control system, and is connected to the mother board with mixed signal connectors. It sends the frequency error data to the PC though VXI databus, and provides two analog phase errors outputs. In current design, one single unit supports four channel discriminations of RF frequencies/phases. Preliminary tests show that the reported phase detector has a bandwidth of 400MHz. A unique implementation of frequency discrimination was carefully carried out to ensure the resolution can reach as high as 1Hz. The phase-frequency detector has been successfully applied to the Accelerator Cryo Module (ACM) system and the requirement of the low level RF control system is satisfied. After a long-term running test, the stability and reliability of the phase-frequency detector are verified.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPAK106
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THPAL123	Fabrication and Test of β=0.3 325MHz Balloon Single Spoke Resonator	3934
	Z.Y. Yao, J.J. Keir, D. Kishi, D. Lang, R.E. Laxdal, H.L. Liu, Y. Ma, B. Matheson, B.S. Waraich, Q. Zheng, V. Zvyagintsev TRIUMF, Vancouver, Canada
	A novel balloon variant of the single spoke resonator (SSR) has been designed, fabricated and tested at TRIUMF. The cavity is the β=0.3 325 MHz SSR1 prototype for the Rare Isotope Science Project (RISP) in Korea. The balloon variant is specifically designed to reduce the likelihood of multipacting barriers near the operating point. A systematic multipacting study led to a novel geometry, a spherical cavity with re-entrant irises plus a spoke. The balloon cavity provides competitive RF parameters and a robust mechanical structure. Cold tests demonstrated the principle of the balloon concept. The fabrication experience and the preliminary test results will be reported in this paper.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPAL123
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THPMK096	Tuners Alignment on Two 9-Cell Cavities with Single Amplifier under Self-Excited Loop	4527
	K. Fong, Z.T. Ang, M.P. Laverty, Q. Zheng TRIUMF, Vancouver, Canada
	The TRIUMF eLinac ACM consists of two 9-cell cavities which are driven by a single klystron. The output power from the klystron are split by a variable power divider and send down 2 independently phase adjustable transmission lines to their respective cryomodules. The vector sum of the fields from both cryomodules is used for phase-locked self-excited loop regulation. A semi-automatic procedure to tune the 2 cyromodules to provide the correct amplitudes and phases for self-excitation as well as beam acceleration is described.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPMK096
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Paper

Title

Page

400 MHz Frequency/phase Detector and Counter

3481

X.L. Fu, B. Ji, Z.G. Yin, T.J. Zhang
CIAE, Beijing, People's Republic of China
G. Dennison
UBC & TRIUMF, Vancouver, British Columbia, Canada
K. Fong, M.P. Laverty, Q. Zheng
TRIUMF, Vancouver, Canada

To enhance the performance and precision of TRIUMF Low Level RF system, a frequency/phase detector and counter based on FPGA is developed. The frequency/phase detector and counter is designed as a daughter board of the low level RF control system, and is connected to the mother board with mixed signal connectors. It sends the frequency error data to the PC though VXI databus, and provides two analog phase errors outputs. In current design, one single unit supports four channel discriminations of RF frequencies/phases. Preliminary tests show that the reported phase detector has a bandwidth of 400MHz. A unique implementation of frequency discrimination was carefully carried out to ensure the resolution can reach as high as 1Hz. The phase-frequency detector has been successfully applied to the Accelerator Cryo Module (ACM) system and the requirement of the low level RF control system is satisfied. After a long-term running test, the stability and reliability of the phase-frequency detector are verified.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPAK106

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THPAL123

Fabrication and Test of β=0.3 325MHz Balloon Single Spoke Resonator

3934

Z.Y. Yao, J.J. Keir, D. Kishi, D. Lang, R.E. Laxdal, H.L. Liu, Y. Ma, B. Matheson, B.S. Waraich, Q. Zheng, V. Zvyagintsev
TRIUMF, Vancouver, Canada

A novel balloon variant of the single spoke resonator (SSR) has been designed, fabricated and tested at TRIUMF. The cavity is the β=0.3 325 MHz SSR1 prototype for the Rare Isotope Science Project (RISP) in Korea. The balloon variant is specifically designed to reduce the likelihood of multipacting barriers near the operating point. A systematic multipacting study led to a novel geometry, a spherical cavity with re-entrant irises plus a spoke. The balloon cavity provides competitive RF parameters and a robust mechanical structure. Cold tests demonstrated the principle of the balloon concept. The fabrication experience and the preliminary test results will be reported in this paper.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPAL123

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THPMK096

Tuners Alignment on Two 9-Cell Cavities with Single Amplifier under Self-Excited Loop

4527

K. Fong, Z.T. Ang, M.P. Laverty, Q. Zheng
TRIUMF, Vancouver, Canada

The TRIUMF eLinac ACM consists of two 9-cell cavities which are driven by a single klystron. The output power from the klystron are split by a variable power divider and send down 2 independently phase adjustable transmission lines to their respective cryomodules. The vector sum of the fields from both cryomodules is used for phase-locked self-excited loop regulation. A semi-automatic procedure to tune the 2 cyromodules to provide the correct amplitudes and phases for self-excitation as well as beam acceleration is described.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPMK096

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