CYCLOTRONS2022 - List of Keywords (FFAG)

Paper	Title	Other Keywords	Page
WEPO001	Field Matching of F-D-F, Gap Shaping Magnets for a 2 GeV CW FFA	FEM, focusing, lattice, proton	200
	W.F. Fu, T.J. Bian, C. Wang, S.P. Zhang, T.J. Zhang, H. Zhou, X.F. Zhu CIAE, Beijing, People’s Republic of China
	Funding: Work supported by the National Natural Science Foundation of China under Grant 12135020 and the basic research fund from the Ministry of Finance of China under Grant BRF201901. Fixed Field Alternating Gradient Accelerators have been developed for decades. A continuous wave (CW) 2 GeV FFA which aims at high-power proton beam applications is under developing in China Institute of Atomic Energy (CIAE). To avoid dangerous resonance lines and manipulate the tune diagram flexibly, 3rd order magnetic field is applied along the radius and 10-fold symmetrical F-D-F scheme has been proved to be feasible. In this paper, Integral Equation Method (IEM) is introduced and shown more efficient than adjusting the variable gap manually, saving time for magnet design. First of all, the radial mean field is set as a main design goal and the Δ H at different radii is solved by linear equations based on IEM. The isochronism is done when the mean field is well matched with the design value, whereas some precise corrections are needed for the oscillating frequency Vr and Vz, such as fringe field effects and multipole components near the end of pole face. The tune shift caused by fringe field is also included in this paper. Fringe field is more crucial for HTS magnets especially, since the leaked field of superconducting coil is ~1 kGs. Considering that, we apply an angular matching method to compensate the tune shift by fringe field.
	Poster WEPO001 [3.442 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-CYCLOTRONS2022-WEPO001
About •	Received ※ 30 December 2022 — Revised ※ 28 January 2023 — Accepted ※ 09 February 2023 — Issue date ※ 12 June 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

FRAO03	Engineering Design and Fabricate Technology for Superconducting Magnets in Cyclotron	superconducting-magnet, cyclotron, proton, vacuum	364
	Z.XY. Guo Suzhou Bama Superconductor Tech. Co.,Ltd., Zhangpu Town, People’s Republic of China
	Magnets play an import role in cyclotrons. Application of superconducting magnets can make the cyclotron more compact, magnet field higher, and operation cost lower. From 1982 the first external beam was extracted from the K500 cyclotron at MSU, cyclotrons based on superconducting magnets became a popular research field in science, research, medicine and so on. Especially in recent years superconducting cyclotrons is increasing number in heavy iron therapy application, and they are an easy and cheap way to get ion beams. As a superconducting magnet besides the electromagnetic design to meet the beam transport requirement, there are many special engineering design points, including mechanical, cooling, stability, safety, measurement and so on. To fabricate the superconducting magnet, especially those with specially winding shape and configuration, need to study the process including winding, resin vacuum pressure impregnation, superconductor welding joint, assembling and so on.This report describes the engineering design technology, key fabricate technology, and some special equipment developed for superconducting magnets, including NbTi, NbSn3 and YBCO magnets. Some projects finished and carrying on in Bama Superconductive Tech Co. are also presented in this report, these projects are mainly related to cyclotron, synchrocyclotrons, FFAG accelerators, medical accelerators and so on.
	Slides FRAO03 [8.647 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-CYCLOTRONS2022-FRAO03
About •	Received ※ 06 December 2022 — Revised ※ 28 February 2023 — Accepted ※ 03 March 2023 — Issue date ※ 20 May 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Other Keywords

Page

WEPO001

Field Matching of F-D-F, Gap Shaping Magnets for a 2 GeV CW FFA

FEM, focusing, lattice, proton

200

W.F. Fu, T.J. Bian, C. Wang, S.P. Zhang, T.J. Zhang, H. Zhou, X.F. Zhu
CIAE, Beijing, People’s Republic of China

Funding: Work supported by the National Natural Science Foundation of China under Grant 12135020 and the basic research fund from the Ministry of Finance of China under Grant BRF201901.
Fixed Field Alternating Gradient Accelerators have been developed for decades. A continuous wave (CW) 2 GeV FFA which aims at high-power proton beam applications is under developing in China Institute of Atomic Energy (CIAE). To avoid dangerous resonance lines and manipulate the tune diagram flexibly, 3rd order magnetic field is applied along the radius and 10-fold symmetrical F-D-F scheme has been proved to be feasible. In this paper, Integral Equation Method (IEM) is introduced and shown more efficient than adjusting the variable gap manually, saving time for magnet design. First of all, the radial mean field is set as a main design goal and the Δ H at different radii is solved by linear equations based on IEM. The isochronism is done when the mean field is well matched with the design value, whereas some precise corrections are needed for the oscillating frequency Vr and Vz, such as fringe field effects and multipole components near the end of pole face. The tune shift caused by fringe field is also included in this paper. Fringe field is more crucial for HTS magnets especially, since the leaked field of superconducting coil is ~1 kGs. Considering that, we apply an angular matching method to compensate the tune shift by fringe field.

Poster WEPO001 [3.442 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-CYCLOTRONS2022-WEPO001

About •

Received ※ 30 December 2022 — Revised ※ 28 January 2023 — Accepted ※ 09 February 2023 — Issue date ※ 12 June 2023

Cite •

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

FRAO03

Engineering Design and Fabricate Technology for Superconducting Magnets in Cyclotron

superconducting-magnet, cyclotron, proton, vacuum

364

Z.XY. Guo
Suzhou Bama Superconductor Tech. Co.,Ltd., Zhangpu Town, People’s Republic of China

Magnets play an import role in cyclotrons. Application of superconducting magnets can make the cyclotron more compact, magnet field higher, and operation cost lower. From 1982 the first external beam was extracted from the K500 cyclotron at MSU, cyclotrons based on superconducting magnets became a popular research field in science, research, medicine and so on. Especially in recent years superconducting cyclotrons is increasing number in heavy iron therapy application, and they are an easy and cheap way to get ion beams. As a superconducting magnet besides the electromagnetic design to meet the beam transport requirement, there are many special engineering design points, including mechanical, cooling, stability, safety, measurement and so on. To fabricate the superconducting magnet, especially those with specially winding shape and configuration, need to study the process including winding, resin vacuum pressure impregnation, superconductor welding joint, assembling and so on.This report describes the engineering design technology, key fabricate technology, and some special equipment developed for superconducting magnets, including NbTi, NbSn3 and YBCO magnets. Some projects finished and carrying on in Bama Superconductive Tech Co. are also presented in this report, these projects are mainly related to cyclotron, synchrocyclotrons, FFAG accelerators, medical accelerators and so on.

Slides FRAO03 [8.647 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-CYCLOTRONS2022-FRAO03

About •

Received ※ 06 December 2022 — Revised ※ 28 February 2023 — Accepted ※ 03 March 2023 — Issue date ※ 20 May 2023

Cite •

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