SAP2017 - List of Authors (He, Y.)

Paper	Title	Page
MOPH32	Beam Parameter Reconstruction at the Input of LEBT of C-ADS Injector II	103
	W.L. Chen, W.P. Dou, Y. He, S.H. Liu, Y.S. Qin, C. Wang, W.S. Wang, Z.J. Wang IMP/CAS, Lanzhou, People's Republic of China
	The Injector II for the C-ADS is designed to accelerate a proton beam to 10 MeV in continuous wave (CW) mode with beam current up to 10 mA, which is the demonstration of the key technologies for CiADS. The LEBT section physical length and dynamic lattice is calibrated recently, and the more receivable beam parameters has been reconstructed at the input of LEBT. AS the transport of high current beams at low energies is critical, for at kinetic energies of a few MeV, the beams are space charge dominated. This paper will introduce beam parameters reconstruction based on emittance measurement experiment and PIC code TraceWin to reconstruct with space charge considered.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-SAP2017-MOPH32
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MOPH33	Beam Optics Verification for A QWR	106
	Y.S. Qin, W.L. Chen, P.H. Gao, Y. He, H. Jia, Y.Z. Jia, S.H. Liu, C. Wang, Z.J. Wang IMP/CAS, Lanzhou, People's Republic of China
	Quarter-wave resonators (QWR) are being widely used in linac for acceleration of ions with low-velocity. Two effects of this kind of cavities are the beam steering effect and RF defocusing effect caused by geometric asymmetry. Measurement for these two effects has been conducted by BPM and wire in a QWR at IMP. The experimental result and simulation result matches well.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-SAP2017-MOPH33
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MOPH34	Beam Dynamics Design of CiADS Superconducting Section	109
	S.H. Liu, Y. He, Z.J. Wang IMP/CAS, Lanzhou, People's Republic of China
	China Initiative Accelerator Driven system (CiADS) is a strategic plan to solve the nuclear waste problem and the resource problem for nuclear power plants in China, and it aims to design and build an ADS demonstration facility with 500 MeV in energy and 5mA in beam current. CiADS contains driver linac, target and reactor. In this paper, the beam dynamics philosophy applied to the design of the superconducting part of the linac as well as the beam dynamics performance of this structure are focused on.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-SAP2017-MOPH34
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MOPH35	Orbit Correction Study based on Simulation for Injector II	112
	W.S. Wang, W.L. Chen, W.P. Dou, Y. He, P. Jiang, S.H. Liu, Y.S. Qin, Z.J. Wang IMP/CAS, Lanzhou, People's Republic of China
	Orbit correction is one of the most fundamental process-es used for beam control in accelerators. The CADS is a CW machine and a few particle loss will cause serious damage to the machine. Therefore, the quality of the or-bit control is an essential component towards the effi-ciency in operation, flexibility in machine studies. This paper describes an orbit correction implementation using singular value decomposition(SVD) of the response ma-trix and the simulation of its application to the CIADS injector II. This effort was achieved by exploiting the capabilities of Python, which provided the hands-on modules to develop the GUI code easily. Also involved in this effort was the code TraceWin, which was used to construct the virtual machine by providing the parame-ters of the Linac optics. Several iterations of the orbit correction may be required in order to obtain a satisfac-tory control of the orbit, because the the response matrix changes with iteration in an attenuating mode. After ap-propriate removal the redundancy steerers, a promising result of the orbit control was achieved.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-SAP2017-MOPH35
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MOPH36	The Prgress of the China Material Irradiation Facility RFQ	115
	W.P. Dou, Y. He, C.X. Li, S.H. Liu, F.F. Wang, Z.J. Wang, X.B. Xu, Z.L. Zhang IMP/CAS, Lanzhou, People's Republic of China
	The design and low power RF measurement of the radio frequency quadruple (RFQ) for the front end of China Material Irradiation Facility (CMIF), which is an accelera-tor based neutron irradiation facility for fusion reactor material qualification, has been completed. The RFQ, which operated under CW mode, is specified to accelerate 10 mA deuteron beam from the energy of 20 keV/u to 1.5 MeV/u. To reduce the possibility of beam loss in supper conducting section, the output longitudinal emittance need be optimized. The idea of 'Kick-drift' is adopted in beam dynamic design. The challenge for CW RFQ is not only the beam dynamic design but also in the design of cavity structure and cooling of structure. With the experi-ence obtained in the design of the RFQ for CIADS injec-tor II, the structure design and cooling design have been finished. The results of low power RF measurement show the flatness and asymmetry are below 4% for each mod-ule.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-SAP2017-MOPH36
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MOPH37	Calibration of the BPM Offsets in Cryomodule at CiADS Injector II	119
	C. Feng, Y. He, W.S. Wang, Z.J. Wang IMP/CAS, Lanzhou, People's Republic of China
	China Initiative Accelerator Driven System (CiADS) project is a strategic plan to solve the nuclear waste problem and the resource problem for nuclear power plants in China. For CiADS driven linac, which has a long superconducting accelerator section, traditional ways to calibrate the Beam Position Monitor (BPM) are not always available. In order to calibrate the BPM offsets in cryomodule so as to adjust the beam orbit effectively and accurately, we have tried to scan the superconducting solenoid's current, read the BPM values, and fit the data to get BPM offsets.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-SAP2017-MOPH37
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TUPH30	Redundancy Analysis of Solid-state Ampliifers for CiADS Accelerator	169
	P.H. Gao, W.L. Chen, W.P. Dou, C. Feng, Y. He, H. Jia, Y.Z. Jia, P. Jiang, S.H. Liu, Y.S. Qin, C. Wang, W.S. Wang, Z.J. Wang IMP/CAS, Lanzhou, People's Republic of China
	The solid-state amplifier(SSA) will be applied in China Initial Accelerator Driven System (CiADS) accelarator. 20KW SSA is the basis of RF power systems. With considering power loss redundancy of the main amplifier(MA) is analyzed by builting k/N reliability model for various redundancy. 26/30 redundancy is optimal for 20KW SSA in term of reliability.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-SAP2017-TUPH30
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Paper

Title

Page

Beam Parameter Reconstruction at the Input of LEBT of C-ADS Injector II

103

W.L. Chen, W.P. Dou, Y. He, S.H. Liu, Y.S. Qin, C. Wang, W.S. Wang, Z.J. Wang
IMP/CAS, Lanzhou, People's Republic of China

The Injector II for the C-ADS is designed to accelerate a proton beam to 10 MeV in continuous wave (CW) mode with beam current up to 10 mA, which is the demonstration of the key technologies for CiADS. The LEBT section physical length and dynamic lattice is calibrated recently, and the more receivable beam parameters has been reconstructed at the input of LEBT. AS the transport of high current beams at low energies is critical, for at kinetic energies of a few MeV, the beams are space charge dominated. This paper will introduce beam parameters reconstruction based on emittance measurement experiment and PIC code TraceWin to reconstruct with space charge considered.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-SAP2017-MOPH32

Export •

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

MOPH33

Beam Optics Verification for A QWR

106

Y.S. Qin, W.L. Chen, P.H. Gao, Y. He, H. Jia, Y.Z. Jia, S.H. Liu, C. Wang, Z.J. Wang
IMP/CAS, Lanzhou, People's Republic of China

Quarter-wave resonators (QWR) are being widely used in linac for acceleration of ions with low-velocity. Two effects of this kind of cavities are the beam steering effect and RF defocusing effect caused by geometric asymmetry. Measurement for these two effects has been conducted by BPM and wire in a QWR at IMP. The experimental result and simulation result matches well.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-SAP2017-MOPH33

Export •

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

MOPH34

Beam Dynamics Design of CiADS Superconducting Section

109

S.H. Liu, Y. He, Z.J. Wang
IMP/CAS, Lanzhou, People's Republic of China

China Initiative Accelerator Driven system (CiADS) is a strategic plan to solve the nuclear waste problem and the resource problem for nuclear power plants in China, and it aims to design and build an ADS demonstration facility with 500 MeV in energy and 5mA in beam current. CiADS contains driver linac, target and reactor. In this paper, the beam dynamics philosophy applied to the design of the superconducting part of the linac as well as the beam dynamics performance of this structure are focused on.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-SAP2017-MOPH34

Export •

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

MOPH35

Orbit Correction Study based on Simulation for Injector II

112

W.S. Wang, W.L. Chen, W.P. Dou, Y. He, P. Jiang, S.H. Liu, Y.S. Qin, Z.J. Wang
IMP/CAS, Lanzhou, People's Republic of China

Orbit correction is one of the most fundamental process-es used for beam control in accelerators. The CADS is a CW machine and a few particle loss will cause serious damage to the machine. Therefore, the quality of the or-bit control is an essential component towards the effi-ciency in operation, flexibility in machine studies. This paper describes an orbit correction implementation using singular value decomposition(SVD) of the response ma-trix and the simulation of its application to the CIADS injector II. This effort was achieved by exploiting the capabilities of Python, which provided the hands-on modules to develop the GUI code easily. Also involved in this effort was the code TraceWin, which was used to construct the virtual machine by providing the parame-ters of the Linac optics. Several iterations of the orbit correction may be required in order to obtain a satisfac-tory control of the orbit, because the the response matrix changes with iteration in an attenuating mode. After ap-propriate removal the redundancy steerers, a promising result of the orbit control was achieved.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-SAP2017-MOPH35

Export •

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

MOPH36

The Prgress of the China Material Irradiation Facility RFQ

115

W.P. Dou, Y. He, C.X. Li, S.H. Liu, F.F. Wang, Z.J. Wang, X.B. Xu, Z.L. Zhang
IMP/CAS, Lanzhou, People's Republic of China

The design and low power RF measurement of the radio frequency quadruple (RFQ) for the front end of China Material Irradiation Facility (CMIF), which is an accelera-tor based neutron irradiation facility for fusion reactor material qualification, has been completed. The RFQ, which operated under CW mode, is specified to accelerate 10 mA deuteron beam from the energy of 20 keV/u to 1.5 MeV/u. To reduce the possibility of beam loss in supper conducting section, the output longitudinal emittance need be optimized. The idea of 'Kick-drift' is adopted in beam dynamic design. The challenge for CW RFQ is not only the beam dynamic design but also in the design of cavity structure and cooling of structure. With the experi-ence obtained in the design of the RFQ for CIADS injec-tor II, the structure design and cooling design have been finished. The results of low power RF measurement show the flatness and asymmetry are below 4% for each mod-ule.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-SAP2017-MOPH36

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

MOPH37

Calibration of the BPM Offsets in Cryomodule at CiADS Injector II

119

C. Feng, Y. He, W.S. Wang, Z.J. Wang
IMP/CAS, Lanzhou, People's Republic of China

China Initiative Accelerator Driven System (CiADS) project is a strategic plan to solve the nuclear waste problem and the resource problem for nuclear power plants in China. For CiADS driven linac, which has a long superconducting accelerator section, traditional ways to calibrate the Beam Position Monitor (BPM) are not always available. In order to calibrate the BPM offsets in cryomodule so as to adjust the beam orbit effectively and accurately, we have tried to scan the superconducting solenoid's current, read the BPM values, and fit the data to get BPM offsets.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-SAP2017-MOPH37

Export •

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

TUPH30

Redundancy Analysis of Solid-state Ampliifers for CiADS Accelerator

169

P.H. Gao, W.L. Chen, W.P. Dou, C. Feng, Y. He, H. Jia, Y.Z. Jia, P. Jiang, S.H. Liu, Y.S. Qin, C. Wang, W.S. Wang, Z.J. Wang
IMP/CAS, Lanzhou, People's Republic of China

The solid-state amplifier(SSA) will be applied in China Initial Accelerator Driven System (CiADS) accelarator. 20KW SSA is the basis of RF power systems. With considering power loss redundancy of the main amplifier(MA) is analyzed by builting k/N reliability model for various redundancy. 26/30 redundancy is optimal for 20KW SSA in term of reliability.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-SAP2017-TUPH30

Export •

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