SAP2017 - List of Authors (He, X.)

Paper	Title	Page
MOPH10	The Beam Dynamics Simulation of an L-band Electron Gun using Genetic Algorithm	47
	P.L. Fan, X. He, J. Pang, L. Yang CAEP/IFP, Mianyang, People's Republic of China
	The China Academy of Engineering Physics (CAEP) plans to build XFEL light source. In the beam dynamics simulation there are many parameters to be considered, so we need a high efficient method to find the optimal pa-rameters. Genetic algorithm (GA) [1] is wildly used as one kind of evolutionary algorithm and it can help us to find the optimal parameters in a shorter time. In this paper, we will use genetic algorithm to do the beam dynamics sim-ulation of an L-band electron gun used for the XFEL. We put emphasis on the optimization of the transverse nor-malized projected emittance and the relevant result will be given and discussed.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-SAP2017-MOPH10
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MOPH22	Primary Design of 4 a S-band Linac using Slotted Iris Structure for Hom Damping	76
	J. Pang, S. Chen, X. He CAEP/IFP, Mainyang, Sichuan, People's Republic of China S. Pei, H. Shi, J.R. Zhang IHEP, Beijing, People's Republic of China
	A S-band LINAC with the operating frequency of 2856MHz and beam current of 4 A was designed for flash X-ray radiography for hydrodynamic test. The optimization of the parameters of the LINAC was processed to achieve the minimum beam radius and the proper energy efficiency. For the purpose of reducing the beam orbits offset at the exit of LINAC, a slotted iris accelerating structure would be employed to suppress the transverse Higher Order Modes (HOMs) by cutting four radial slots in the iris to couple the HOMs to SiC loads. In this paper, we present the design of the LINAC and the results of beam dynamic analysis.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-SAP2017-MOPH22
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TUPH08	A Proposal of using Improved Rhodotron as a High Dose Rate Micro-focused X-ray Source	143
	X. He, S.Q. Liao, J. Long, J. Shi, W. Wang, L. Yang CAEP/IFP, Mianyang, People's Republic of China
	High energy X-ray computer tomography has wide application in industry, especially in quality control of complicated high-tech equipment. In many applications, higher spatial resolution is needed to discover smaller defects. Rhodotron have been used to produce high power CW electron beam in hundreds of kilowatts level. In this paper, we propose to use an improved Rhodotron to generate high brightness electron beam with high average power. Beam dynamics study shows that when producing tens of kilowatts electron beam, the normalized RMS emittance can be lower than 10 μm, and the relative RMS energy spread can be lower than 0.2%. The beam can be focused to a spot size of about 100μm, and converted to X-Ray by using a rotating target within several kilowatts beam power. Improved Rhodotron proposed in this paper is a good candidate of X-ray source for high resolution high energy industrial CT systems.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-SAP2017-TUPH08
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TUPH27	Electromagnetic, Thermal, Structural Analysis for the RF-cavity of a Rhodotron Accelerator	165
	L. Yang, X. He, H. Li CAEP/IFP, Mianyang, People's Republic of China
	A Rhodotron-based electron accelerator served as mi-cro-focused X-ray source at a high repetition rate of 10.75 MHz is proposed at IFP, CAEP. The RF-cavity, running in long pulse/ CW mode, will deliver 9 MeV energy gain to the charged beam at the exit by taking its advantage of multiple accelerations with the same field at a frequency of 10⁷.5MHz. A substantial amount of power loss will be dissipated on the RF surface of the cavity within beam time. Further electromagnetic (EM) optimization was performed on a standard coaxial model with slight modifications aiming to achieve a higher shunt impedance, thus less power loss on surfaces. A proper water cooling design is still required to prevent large scale temperature rise on the cavity wall. The corresponding effects on cavity mechanical stability and resonant frequency shifting are concerned. This paper will present the details in the EM, thermal, structural analysis of the RF-cavity.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-SAP2017-TUPH27
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Paper

Title

Page

The Beam Dynamics Simulation of an L-band Electron Gun using Genetic Algorithm

47

P.L. Fan, X. He, J. Pang, L. Yang
CAEP/IFP, Mianyang, People's Republic of China

The China Academy of Engineering Physics (CAEP) plans to build XFEL light source. In the beam dynamics simulation there are many parameters to be considered, so we need a high efficient method to find the optimal pa-rameters. Genetic algorithm (GA) [1] is wildly used as one kind of evolutionary algorithm and it can help us to find the optimal parameters in a shorter time. In this paper, we will use genetic algorithm to do the beam dynamics sim-ulation of an L-band electron gun used for the XFEL. We put emphasis on the optimization of the transverse nor-malized projected emittance and the relevant result will be given and discussed.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-SAP2017-MOPH10

Export •

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

MOPH22

Primary Design of 4 a S-band Linac using Slotted Iris Structure for Hom Damping

76

J. Pang, S. Chen, X. He
CAEP/IFP, Mainyang, Sichuan, People's Republic of China
S. Pei, H. Shi, J.R. Zhang
IHEP, Beijing, People's Republic of China

A S-band LINAC with the operating frequency of 2856MHz and beam current of 4 A was designed for flash X-ray radiography for hydrodynamic test. The optimization of the parameters of the LINAC was processed to achieve the minimum beam radius and the proper energy efficiency. For the purpose of reducing the beam orbits offset at the exit of LINAC, a slotted iris accelerating structure would be employed to suppress the transverse Higher Order Modes (HOMs) by cutting four radial slots in the iris to couple the HOMs to SiC loads. In this paper, we present the design of the LINAC and the results of beam dynamic analysis.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-SAP2017-MOPH22

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

TUPH08

A Proposal of using Improved Rhodotron as a High Dose Rate Micro-focused X-ray Source

143

X. He, S.Q. Liao, J. Long, J. Shi, W. Wang, L. Yang
CAEP/IFP, Mianyang, People's Republic of China

High energy X-ray computer tomography has wide application in industry, especially in quality control of complicated high-tech equipment. In many applications, higher spatial resolution is needed to discover smaller defects. Rhodotron have been used to produce high power CW electron beam in hundreds of kilowatts level. In this paper, we propose to use an improved Rhodotron to generate high brightness electron beam with high average power. Beam dynamics study shows that when producing tens of kilowatts electron beam, the normalized RMS emittance can be lower than 10 μm, and the relative RMS energy spread can be lower than 0.2%. The beam can be focused to a spot size of about 100μm, and converted to X-Ray by using a rotating target within several kilowatts beam power. Improved Rhodotron proposed in this paper is a good candidate of X-ray source for high resolution high energy industrial CT systems.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-SAP2017-TUPH08

Export •

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

TUPH27

Electromagnetic, Thermal, Structural Analysis for the RF-cavity of a Rhodotron Accelerator

165

L. Yang, X. He, H. Li
CAEP/IFP, Mianyang, People's Republic of China

A Rhodotron-based electron accelerator served as mi-cro-focused X-ray source at a high repetition rate of 10.75 MHz is proposed at IFP, CAEP. The RF-cavity, running in long pulse/ CW mode, will deliver 9 MeV energy gain to the charged beam at the exit by taking its advantage of multiple accelerations with the same field at a frequency of 10⁷.5MHz. A substantial amount of power loss will be dissipated on the RF surface of the cavity within beam time. Further electromagnetic (EM) optimization was performed on a standard coaxial model with slight modifications aiming to achieve a higher shunt impedance, thus less power loss on surfaces. A proper water cooling design is still required to prevent large scale temperature rise on the cavity wall. The corresponding effects on cavity mechanical stability and resonant frequency shifting are concerned. This paper will present the details in the EM, thermal, structural analysis of the RF-cavity.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-SAP2017-TUPH27

Export •

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