IPAC2018 - List of Authors (Xu, H.)

Paper	Title	Page
THPMK135	Corrector Layout Optimization Using NSGA-II for HALS	4629
	D.R. Xu, Z.H. Bai, L. Wang, W. Wang, H. Xu USTC/NSRL, Hefei, Anhui, People's Republic of China
	In this paper, we present a method to find the global optimum correctors layout based NSGA-II algorithm when the number of correctors is limited to be equal to the number of BPMs. We prove that this method works well with HALS.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPMK135
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THPML133	Design and Optimization of the Electron Gun	4995
	K. Huang, T.L. He, Z.L. Ren, D.R. Xu, H. Xu USTC/NSRL, Hefei, Anhui, People's Republic of China Y. Chen Department of Information Engineering , Anhui Economic Management Cadres' Institute, Hefei, Anhui, People's Republic of China
	Funding: Work supported by the National Nature Science Foundation of China under Grant Nos.11375176 and 10875118. Design of an energy-modified electron gun is of significance to do some research on the properties of Diamond-amplified cathode. Based on the design method of the Pierce electron gun, the optimum parameters of the electron gun have been obtained using the Opera-3D program. And the beam waist's position, the beam current, the beam size and the beam emittance related to the electron bean energy was investigated in this paper.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML133
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THPML134	Design of the Magnets of the HALS Project	4998
	Z.L. Ren, C. Chen, T.L. He, L. Wang, X.Q. Wang, H. Xu, B. Zhang USTC/NSRL, Hefei, Anhui, People's Republic of China
	Funding: Work supported by the National Nature Science Foundation of China under Grant Nos.11375176 hlxu@ustc.edu.cn ** zhbo@ustc.edu.cn* The Hefei Advanced Light Source (HALS) is a future soft X-ray diffraction-limited storage ring at NSRL, this project aims to improve the brilliance and coherence of the X-ray beams and to decrease the horizontal emittance. The lattice of the HALS ring relies on magnets with demanding specifications, including combined function dipole-quadrupoles (DQs) with high gradients, dipoles with longitudinal gradients (DLs), high gradient quadrupoles and strong sextupoles. The combined dipole-quadrupole design developed is between the offset quadrupole and septum quadrupole types. The longitudinal-gradient dipoles are permanent magnets. The quadrupoles and sextupoles rely on a more conventional design. All the magnets have been designed using POSSION, Radia, and OPERA-3D.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML134
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THPML135	Design of the Combined Function Dipole-Quadrupoles (DQS) with High Gradients	5001
	Z.L. Ren, C. Chen, T.L. He, L. Wang, X.Q. Wang, H. Xu, B. Zhang USTC/NSRL, Hefei, Anhui, People's Republic of China
	Funding: Work supported by the National Nature Science Foundation of China under Grant Nos.11375176 hlxu@ustc.edu.cn *zhbo@ustc.edu.cn Combined dipole-quadrupoles (DQs) can be obtained with the design of tapered dipole or offset quadrupole. However, the tapered dipole design can not achieve a high gradient field, as it will lead to poor field quality in the low field area of the magnet bore, and the design of offset quadrupole will increase the magnet size and power consumption. Finally, the dipole-quadrupole design developed is between the offset quadrupole and septum quadrupole types. The dimensions of the poles and the coils of the low field side have been reduced. The 2D pole profile is simulated and optimized by using POSSION and Radia, while the 3D modle using Radia and OPERA-3D. The end shimming and chamfer are modelled to meet the field uniformity requirement.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML135
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THPML136	Study of Secondary Electron Generation and Transport in Diamond	5004
SUSPF025	use link to see paper's listing under its alternate paper code
	T.L. He, K. Huang, Z.L. Ren, L. Wang, D.R. Xu, H. Xu USTC/NSRL, Hefei, Anhui, People's Republic of China
	Energetic primary electrons (~ keV) impinging on the diamond film with its both surface under bias field in ~ MV/m, will excite secondary electron (SE) response including SE generation & transport. Although there have been 3D Monte Carlo (MC) simulation to study the two processes, this paper will introduce another method. Based on optical dielectric model, 3D MC simulation was implemented to study the generation process, and SE generation function was obtained by fitting the calculations. Using this function, the diffusion-drift equation of charge carriers (electron and hole) can be solved in 1D for the transport process, and the variation of SE depth distribution with time can be obtained.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML136
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Paper

Title

Page

Corrector Layout Optimization Using NSGA-II for HALS

4629

D.R. Xu, Z.H. Bai, L. Wang, W. Wang, H. Xu
USTC/NSRL, Hefei, Anhui, People's Republic of China

In this paper, we present a method to find the global optimum correctors layout based NSGA-II algorithm when the number of correctors is limited to be equal to the number of BPMs. We prove that this method works well with HALS.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPMK135

Export •

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

THPML133

Design and Optimization of the Electron Gun

4995

K. Huang, T.L. He, Z.L. Ren, D.R. Xu, H. Xu
USTC/NSRL, Hefei, Anhui, People's Republic of China
Y. Chen
Department of Information Engineering , Anhui Economic Management Cadres' Institute, Hefei, Anhui, People's Republic of China

Funding: Work supported by the National Nature Science Foundation of China under Grant Nos.11375176 and 10875118.
Design of an energy-modified electron gun is of significance to do some research on the properties of Diamond-amplified cathode. Based on the design method of the Pierce electron gun, the optimum parameters of the electron gun have been obtained using the Opera-3D program. And the beam waist's position, the beam current, the beam size and the beam emittance related to the electron bean energy was investigated in this paper.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML133

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

THPML134

Design of the Magnets of the HALS Project

4998

Z.L. Ren, C. Chen, T.L. He, L. Wang, X.Q. Wang, H. Xu, B. Zhang
USTC/NSRL, Hefei, Anhui, People's Republic of China

Funding: Work supported by the National Nature Science Foundation of China under Grant Nos.11375176 * hlxu@ustc.edu.cn ** zhbo@ustc.edu.cn
The Hefei Advanced Light Source (HALS) is a future soft X-ray diffraction-limited storage ring at NSRL, this project aims to improve the brilliance and coherence of the X-ray beams and to decrease the horizontal emittance. The lattice of the HALS ring relies on magnets with demanding specifications, including combined function dipole-quadrupoles (DQs) with high gradients, dipoles with longitudinal gradients (DLs), high gradient quadrupoles and strong sextupoles. The combined dipole-quadrupole design developed is between the offset quadrupole and septum quadrupole types. The longitudinal-gradient dipoles are permanent magnets. The quadrupoles and sextupoles rely on a more conventional design. All the magnets have been designed using POSSION, Radia, and OPERA-3D.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML134

Export •

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

THPML135

Design of the Combined Function Dipole-Quadrupoles (DQS) with High Gradients

5001

Z.L. Ren, C. Chen, T.L. He, L. Wang, X.Q. Wang, H. Xu, B. Zhang
USTC/NSRL, Hefei, Anhui, People's Republic of China

Funding: Work supported by the National Nature Science Foundation of China under Grant Nos.11375176 * hlxu@ustc.edu.cn **zhbo@ustc.edu.cn
Combined dipole-quadrupoles (DQs) can be obtained with the design of tapered dipole or offset quadrupole. However, the tapered dipole design can not achieve a high gradient field, as it will lead to poor field quality in the low field area of the magnet bore, and the design of offset quadrupole will increase the magnet size and power consumption. Finally, the dipole-quadrupole design developed is between the offset quadrupole and septum quadrupole types. The dimensions of the poles and the coils of the low field side have been reduced. The 2D pole profile is simulated and optimized by using POSSION and Radia, while the 3D modle using Radia and OPERA-3D. The end shimming and chamfer are modelled to meet the field uniformity requirement.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML135

Export •

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

THPML136

Study of Secondary Electron Generation and Transport in Diamond

5004

SUSPF025

use link to see paper's listing under its alternate paper code

T.L. He, K. Huang, Z.L. Ren, L. Wang, D.R. Xu, H. Xu
USTC/NSRL, Hefei, Anhui, People's Republic of China

Energetic primary electrons (~ keV) impinging on the diamond film with its both surface under bias field in ~ MV/m, will excite secondary electron (SE) response including SE generation & transport. Although there have been 3D Monte Carlo (MC) simulation to study the two processes, this paper will introduce another method. Based on optical dielectric model, 3D MC simulation was implemented to study the generation process, and SE generation function was obtained by fitting the calculations. Using this function, the diffusion-drift equation of charge carriers (electron and hole) can be solved in 1D for the transport process, and the variation of SE depth distribution with time can be obtained.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML136

Export •

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