IPAC2013 - List of Authors (Wang, L.)

Paper	Title	Page
TUPEA028	Echo-enabled Harmonic Generation based on Hefei Storage Ring	1208
	H.T. Li, W.W. Gao, Q.K. Jia, L. Wang USTC/NSRL, Hefei, Anhui, People's Republic of China
	Echo-Enabled Harmonic Generation (EEHG) has been proposed and experimently demonstrated recently. In this paper, we numerically investigate the possibility of operating EEHG based on Hefei storage ring, which has a short circumference and a small momentum compaction factor. The difference to other similar reserch is that we use the whole ring as the first dispersive section and an optical klystron as the second one.

TUPWA024	The Beam Gass Coulomb Scattering in Electron Storage Ring	1778
	X.L. Yu, Z. Bai, W.W. Gao, W. Li, L. Wang USTC/NSRL, Hefei, Anhui, People's Republic of China
	Among the various factors which determine the beam life time of the HLSII electron storage ring, the beam loss due to the scattering on residual gas is simulated using MC method. The paper will give the process of elastic and inelastic scattering, and the probability of each scattering is calculated, then using MC sampling to decide which particles will participate in the collision. Tracking the beam with scattering of beam-gas included, the spatial distribution of beam will be obtained. Finally we will give the influence analysis of beam-gas scattering.

TUPWA030	Impedances Calculations of Bellows in HLS II Storage Ring	1784
	Q. Zhang, W. Li, L. Wang USTC/NSRL, Hefei, Anhui, People's Republic of China
	The upgrade project of Hefei Lighe Source storage ring is carrying on.In this project,a new Bellows, in which shielding is provided by sprung fingers which can slide along the beam screen,is installed at the accelerator interaction area In order to reduce this impedance to an acceptable value. The contributions of Bellows to short range wakefields and broadband impedance were calculated numerically by Mafia code .

WEPEA025	Chromatic Sextupole Pair Optimization Methods for Enlarging Dynamic Aperture	2555
	Z. Bai, Q.K. Jia, W. Li, L. Wang, Q. Zhang USTC/NSRL, Hefei, Anhui, People's Republic of China
	Based on the step-by-step chromaticity compensation method [1] and artificial intelligence algorithms, we propose new numerical methods, called chromatic sextupole pair optimization methods, for enlarging the dynamic aperture of electron storage rings. In the new methods, the decision variables related to chromatic sextupole pairs are optimized using artificial intelligence algorithms to enlarge the dynamic aperture. We demonstrate that the new methods are equivalent to the recently used numerical method, in which the decision variables, sextupole strengths, are optimized using artificial intelligence algorithms. [1] E. Levichev, P. Piminov, Proceedings of EPAC 2006, p. 2116.

WEPEA027	Nonlinear Model Calibration in Electron Storage Rings via Frequency Analysis	2558
	G. Liu, W. Li, L. Wang, K. Xuan USTC/NSRL, Hefei, Anhui, People's Republic of China
	Frequency analysis of turn-by-turn BPM data is a very useful numerical method for analysing the detrimental effect of the nonlinear resonances in storage rings, and which has been widely used for nonlinear resonances measurement and correction. We applied this method in this paper for calibrating the nonlinear model by numerical fitting of the sextupole components with the effect of radiation damping and decoherence of the betatron oscillation in HLSII storage ring.

Paper

Title

Page

Echo-enabled Harmonic Generation based on Hefei Storage Ring

1208

H.T. Li, W.W. Gao, Q.K. Jia, L. Wang
USTC/NSRL, Hefei, Anhui, People's Republic of China

Echo-Enabled Harmonic Generation (EEHG) has been proposed and experimently demonstrated recently. In this paper, we numerically investigate the possibility of operating EEHG based on Hefei storage ring, which has a short circumference and a small momentum compaction factor. The difference to other similar reserch is that we use the whole ring as the first dispersive section and an optical klystron as the second one.

TUPWA024

The Beam Gass Coulomb Scattering in Electron Storage Ring

1778

X.L. Yu, Z. Bai, W.W. Gao, W. Li, L. Wang
USTC/NSRL, Hefei, Anhui, People's Republic of China

Among the various factors which determine the beam life time of the HLSII electron storage ring, the beam loss due to the scattering on residual gas is simulated using MC method. The paper will give the process of elastic and inelastic scattering, and the probability of each scattering is calculated, then using MC sampling to decide which particles will participate in the collision. Tracking the beam with scattering of beam-gas included, the spatial distribution of beam will be obtained. Finally we will give the influence analysis of beam-gas scattering.

TUPWA030

Impedances Calculations of Bellows in HLS II Storage Ring

1784

Q. Zhang, W. Li, L. Wang
USTC/NSRL, Hefei, Anhui, People's Republic of China

The upgrade project of Hefei Lighe Source storage ring is carrying on.In this project,a new Bellows, in which shielding is provided by sprung fingers which can slide along the beam screen,is installed at the accelerator interaction area In order to reduce this impedance to an acceptable value. The contributions of Bellows to short range wakefields and broadband impedance were calculated numerically by Mafia code .

WEPEA025

Chromatic Sextupole Pair Optimization Methods for Enlarging Dynamic Aperture

2555

Z. Bai, Q.K. Jia, W. Li, L. Wang, Q. Zhang
USTC/NSRL, Hefei, Anhui, People's Republic of China

Based on the step-by-step chromaticity compensation method [1] and artificial intelligence algorithms, we propose new numerical methods, called chromatic sextupole pair optimization methods, for enlarging the dynamic aperture of electron storage rings. In the new methods, the decision variables related to chromatic sextupole pairs are optimized using artificial intelligence algorithms to enlarge the dynamic aperture. We demonstrate that the new methods are equivalent to the recently used numerical method, in which the decision variables, sextupole strengths, are optimized using artificial intelligence algorithms.
[1] E. Levichev, P. Piminov, Proceedings of EPAC 2006, p. 2116.

WEPEA027

Nonlinear Model Calibration in Electron Storage Rings via Frequency Analysis

2558

G. Liu, W. Li, L. Wang, K. Xuan
USTC/NSRL, Hefei, Anhui, People's Republic of China

Frequency analysis of turn-by-turn BPM data is a very useful numerical method for analysing the detrimental effect of the nonlinear resonances in storage rings, and which has been widely used for nonlinear resonances measurement and correction. We applied this method in this paper for calibrating the nonlinear model by numerical fitting of the sextupole components with the effect of radiation damping and decoherence of the betatron oscillation in HLSII storage ring.