IPAC2016 - List of Authors (Li, J.Y.)

Paper	Title	Page
MOPOW054	The 4th Harmonic Cavity for Hefei Light Source-II	837
	C.-F. Wu, S. Dong, G. Huang, D. Jia, K. Jin, C. Li, J.Y. Li, W. Li, J.G. Wang, L. Wang, W. Xu, K. Xuan USTC/NSRL, Hefei, Anhui, People's Republic of China R.A. Bosch UW-Madison/SRC, Madison, Wisconsin, USA G.Y. Kurkin, E. Rotov BINP SB RAS, Novosibirsk, Russia G. Ya Budker Institute of Nuclear Physics, Novosibirsk, Russia
	The 4th harmonic cavity has been firstly used in the storage ring for HLS-II. The paper presents the physics design, developing process and the experimental results for commision. The measurment results show that rf parameters are reasonable. The 4th harmonic cavity efficiently lengthen the bunch and increase the beam life-time. Specially, the beam instablity has been supressed.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPOW054
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WEPOR002	Orbit Stabilization for the HLS-II Storage Ring	2661
	W. Xu, J.Y. Li, K. Xuan, H.Y. Zhang USTC/NSRL, Hefei, Anhui, People's Republic of China
	Hefei Light Source has successfully completed a major upgrade project, which greatly improves the light source performance. As one of the most important criteria, the stability of the beam orbit in the storage ring can greatly influence the overall performance of the light source. In this paper we present our efforts on stabilizing the beam orbit during the commissioning of the HLS-II storage ring. We optimized the performance of the power supplies of the ring corrector magnets. The target beam orbit is obtained by measuring the center of the quadrupole magnets using the beam-based alignment method. We also developed a multi-functional orbit feedback system to keep the beam moving on the golden orbit. With these measures, the beam orbit gets more stable than ten percent of the beam size at the light source points.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPOR002
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WEPOR003	Voltage Control for the 4-Th Harmonic Cavity in Hls Storage Ring	2664
	K. Xuan, C. Li, J.Y. Li, G. Liu, W. Xu USTC/NSRL, Hefei, Anhui, People's Republic of China
	In order to increase the beam lifetime, a 4th harmonic RF cavity was installed in the HLS-II storage ring. The electrical fields in the principle cavity and high harmonic cavity stretch the beam in the longitudinal direction, and increase the beam volume in phase space, leading to a longer Touschek lifetime. Stable electrical voltage in the high harmonic cavity is essential for steady beam stretching and better beam lifetime. To get a stable high voltage in the high harmonic cavity, we develop a method to maintain steady resonance condition in the cavity using a PID scheme. This paper presents the details of this method. The feedback result is also reported.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPOR003
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THPOY028	Operational Status of HLS-II	4155
	J.Y. Li, G. Huang, W. Wei, W. Xu, K. Xuan, Y.L. Yang, Z.R. Zhou USTC/NSRL, Hefei, Anhui, People's Republic of China
	After a major renovation, the Hefei light source (HLS), renamed HLS_II, was brought into operation in the beginning of 2015. The operational result shows that the HLS-II not only provides much brighter synchrotron radiation beam for various users, but also shows much higher reliability than the old light source. This paper first gives an overview of the HLS-II. The overall performance of the light source is then summarized in this paper. Some measured key parameters of the light source, including emittance, orbit stability, beam lifetime and so on, are also presented.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOY028
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Paper

Title

Page

The 4th Harmonic Cavity for Hefei Light Source-II

837

C.-F. Wu, S. Dong, G. Huang, D. Jia, K. Jin, C. Li, J.Y. Li, W. Li, J.G. Wang, L. Wang, W. Xu, K. Xuan
USTC/NSRL, Hefei, Anhui, People's Republic of China
R.A. Bosch
UW-Madison/SRC, Madison, Wisconsin, USA
G.Y. Kurkin, E. Rotov
BINP SB RAS, Novosibirsk, Russia
G. Ya
Budker Institute of Nuclear Physics, Novosibirsk, Russia

The 4th harmonic cavity has been firstly used in the storage ring for HLS-II. The paper presents the physics design, developing process and the experimental results for commision. The measurment results show that rf parameters are reasonable. The 4th harmonic cavity efficiently lengthen the bunch and increase the beam life-time. Specially, the beam instablity has been supressed.

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPOW054

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

WEPOR002

Orbit Stabilization for the HLS-II Storage Ring

2661

W. Xu, J.Y. Li, K. Xuan, H.Y. Zhang
USTC/NSRL, Hefei, Anhui, People's Republic of China

Hefei Light Source has successfully completed a major upgrade project, which greatly improves the light source performance. As one of the most important criteria, the stability of the beam orbit in the storage ring can greatly influence the overall performance of the light source. In this paper we present our efforts on stabilizing the beam orbit during the commissioning of the HLS-II storage ring. We optimized the performance of the power supplies of the ring corrector magnets. The target beam orbit is obtained by measuring the center of the quadrupole magnets using the beam-based alignment method. We also developed a multi-functional orbit feedback system to keep the beam moving on the golden orbit. With these measures, the beam orbit gets more stable than ten percent of the beam size at the light source points.

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPOR002

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WEPOR003

Voltage Control for the 4-Th Harmonic Cavity in Hls Storage Ring

2664

K. Xuan, C. Li, J.Y. Li, G. Liu, W. Xu
USTC/NSRL, Hefei, Anhui, People's Republic of China

In order to increase the beam lifetime, a 4th harmonic RF cavity was installed in the HLS-II storage ring. The electrical fields in the principle cavity and high harmonic cavity stretch the beam in the longitudinal direction, and increase the beam volume in phase space, leading to a longer Touschek lifetime. Stable electrical voltage in the high harmonic cavity is essential for steady beam stretching and better beam lifetime. To get a stable high voltage in the high harmonic cavity, we develop a method to maintain steady resonance condition in the cavity using a PID scheme. This paper presents the details of this method. The feedback result is also reported.

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPOR003

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

THPOY028

Operational Status of HLS-II

4155

J.Y. Li, G. Huang, W. Wei, W. Xu, K. Xuan, Y.L. Yang, Z.R. Zhou
USTC/NSRL, Hefei, Anhui, People's Republic of China

After a major renovation, the Hefei light source (HLS), renamed HLS_II, was brought into operation in the beginning of 2015. The operational result shows that the HLS-II not only provides much brighter synchrotron radiation beam for various users, but also shows much higher reliability than the old light source. This paper first gives an overview of the HLS-II. The overall performance of the light source is then summarized in this paper. Some measured key parameters of the light source, including emittance, orbit stability, beam lifetime and so on, are also presented.

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOY028

Export •

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