SAP2017 - List of Authors (Jia, H.)

Paper	Title	Page
MOPH31	Fringe Field Overlap Model for Quadrupoles	99
	H. Jia IMP/CAS, Lanzhou, People's Republic of China M.A. Plum ORNL, Oak Ridge, Tennessee, USA
	Funding: Funded by the China Scholarship Council In the large aperture-to-length ratio quadrupoles, there will be long fringe field. When putting three of this type quadrupoles next to each other, the field will overlap and change the beam dynamics of "hard-edge" model of Triplet quadrupoles. By numeric integration, we find that the transfer matrix difference is quite significant at the first part of MEBT of CADS Injector II. By re-exploring the 'hard-edge' model, the traditional definition of quadrupole's effective length and effective gradient are found to be just rough approximations and not right in this condition. The finding explains the good prediction of beam dyanamics model of MEBT by emittance measurements with different current settings of the triplet quadrupoles, and may be also helpful in explaining some discrepancies in beam lines around the world
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-SAP2017-MOPH31
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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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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)

Paper

Title

Page

Fringe Field Overlap Model for Quadrupoles

99

H. Jia
IMP/CAS, Lanzhou, People's Republic of China
M.A. Plum
ORNL, Oak Ridge, Tennessee, USA

Funding: Funded by the China Scholarship Council
In the large aperture-to-length ratio quadrupoles, there will be long fringe field. When putting three of this type quadrupoles next to each other, the field will overlap and change the beam dynamics of "hard-edge" model of Triplet quadrupoles. By numeric integration, we find that the transfer matrix difference is quite significant at the first part of MEBT of CADS Injector II. By re-exploring the 'hard-edge' model, the traditional definition of quadrupole's effective length and effective gradient are found to be just rough approximations and not right in this condition. The finding explains the good prediction of beam dyanamics model of MEBT by emittance measurements with different current settings of the triplet quadrupoles, and may be also helpful in explaining some discrepancies in beam lines around the world

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-SAP2017-MOPH31

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)

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)