2011 Particle Accelerator Conference - List of Authors (He, D.H.)

Paper	Title	Page
MOP269	Design of Longitudinal Feedback Kicker for HLS Storage Ring	612
	W. Xu, D.H. He USTC/NSRL, Hefei, Anhui, People's Republic of China W. Wu, Y.K. Wu FEL/Duke University, Durham, North Carolina, USA
	Hefei Light Source (HLS) is a dedicated synchrotron radiation research facility. It is now undergoing a major upgrade. To obtain a better performance of the light source, a longitudinal feedback system will be developed as part of the upgrade project to cure the coupled bunch mode instabilities. In this work, we present a design of the LFB kicker, a waveguide overloaded cavity with two input and two output ports. The cavity design specifications include a central frequency of 969 MHz (4.75 RF frequency), a bandwidth of more than 100 MHz, and a high shunt impedance of 1200 Ω. A study is carried out to find the dependence of the cavity performance on a few critical geometric parameters of the cavity. Since the shape of the vacuum chamber of the HLS storage ring is octagon, a transition from a circular vacuum chamber to an octagon one is built into the end pieces of the cavity to minimize the total cavity length. To lower the required amplifier power, the structure is optimized to obtain a high shunt impedance. The higher order modes of the kicker cavity are also considered during the design.

WEP090	Simulation Study of Intrabeam Scattering in Low Emittance Ring	1639
	W. Fan, G. Feng, D.H. He, W. Li, L. Wang, S.C. Zhang, T. Zhou USTC/NSRL, Hefei, Anhui, People's Republic of China
	HALS(Hefei Advanced Light Source) is under designing dedicated to good coherence and high brightness at 1.5GeV. Low emittance is required to reach the design request. Due to the low energy and emittance with relative high bunch charge, intrabeam scattering effect will be very strong. It is worth accurately calculating to check if the design goal can be reached. Theoretic calculation based on Gaussian beam distribution doesn't warrant in strong IBS regime. In this paper we present the results of particle simulation study of intrabeam scattering effect on a temporary design lattice of HALS ring.

Paper

Title

Page

Design of Longitudinal Feedback Kicker for HLS Storage Ring

612

W. Xu, D.H. He
USTC/NSRL, Hefei, Anhui, People's Republic of China
W. Wu, Y.K. Wu
FEL/Duke University, Durham, North Carolina, USA

Hefei Light Source (HLS) is a dedicated synchrotron radiation research facility. It is now undergoing a major upgrade. To obtain a better performance of the light source, a longitudinal feedback system will be developed as part of the upgrade project to cure the coupled bunch mode instabilities. In this work, we present a design of the LFB kicker, a waveguide overloaded cavity with two input and two output ports. The cavity design specifications include a central frequency of 969 MHz (4.75 RF frequency), a bandwidth of more than 100 MHz, and a high shunt impedance of 1200 Ω. A study is carried out to find the dependence of the cavity performance on a few critical geometric parameters of the cavity. Since the shape of the vacuum chamber of the HLS storage ring is octagon, a transition from a circular vacuum chamber to an octagon one is built into the end pieces of the cavity to minimize the total cavity length. To lower the required amplifier power, the structure is optimized to obtain a high shunt impedance. The higher order modes of the kicker cavity are also considered during the design.

WEP090

Simulation Study of Intrabeam Scattering in Low Emittance Ring

1639

W. Fan, G. Feng, D.H. He, W. Li, L. Wang, S.C. Zhang, T. Zhou
USTC/NSRL, Hefei, Anhui, People's Republic of China

HALS(Hefei Advanced Light Source) is under designing dedicated to good coherence and high brightness at 1.5GeV. Low emittance is required to reach the design request. Due to the low energy and emittance with relative high bunch charge, intrabeam scattering effect will be very strong. It is worth accurately calculating to check if the design goal can be reached. Theoretic calculation based on Gaussian beam distribution doesn't warrant in strong IBS regime. In this paper we present the results of particle simulation study of intrabeam scattering effect on a temporary design lattice of HALS ring.