CYCLOTRONS2022 - List of Authors (Ji, B.)

Paper	Title	Page
MOAO02	The Commissioning of a 230 MeV Superconducting Cyclotron CYCIAE-230	15
	C. Wang, H.R. Cai, W.F. Fu, A.L. He, M.Z. Hu, B. Ji, L.Y. Ji, X.L. Jia, Y. Jia, T.Y. Jiang, J. Liu, J.Y. Liu, P. Liu, Z.W. Liu, X. Mu, S. Pei, G.F. Song, Q.Q. Song, F. Wang, J.Y. Wei, L.P. Wen, J.S. Xing, Z.G. Yin, D.Z. Zhang, S.P. Zhang, T.J. Zhang, X. Zheng, H. Zhou, P.F. Zhu, X.F. Zhu CIAE, Beijing, People’s Republic of China
	There are very strong demands for proton accelera-tors in medium energy range in recent years due to the fast growth of proton therapy and the space science in China. For the applications of proton therapy and pro-ton irradiation, the energy range of proton beam is usually from 200MeV to 250MeV, or even higher for astronavigation [1]. An R&D project for constructing a 230MeV superconducting cyclotron (CYCIAE-230) has been initiated at China Institute of Atomic Energy (CIAE) since Jan 2015. In July of 2016, after the fund-ing was approved by China National Nuclear Corpora-tion (CNNC), the construction project was fully launched. In Dec 2019, the superconducting main magnet and the RF system were transferred to the new-ly built commissioning site. Then, the RF commission-ing, ion source and central region test were performed even during the pandemic in early 2020. In September 2020, after finishing the commissioning tests of all subsystems, the beam was reached the extraction channel but with very low efficiency. Since then, with more efforts on beam diagnostics, the fine tuning of the beam phase and the adjusting of the superconduct-ing coil have been proven to be useful to get higher beam extraction efficiency ~55%. In this paper, the commissioning of the key components, including the main magnet, SC coils, internal ion source and central region, extraction system, etc, as well as the commis-sioning progress of the machine CYCIAE-230 will be presented.
	Slides MOAO02 [10.305 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-CYCLOTRONS2022-MOAO02
About •	Received ※ 24 January 2023 — Revised ※ 25 January 2023 — Accepted ※ 09 February 2023 — Issue date ※ 10 June 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPO007	The Design and Commission of Vacuum System for CYCIAE-230 Superconducting Cyclotron	66
	S.P. Zhang, H.R. Cai, W.F. Fu, B. Ji, J.Y. Liu, G.F. Pan, C. Wang, Z.G. Yin, T.J. Zhang, H. Zhou, X.F. Zhu CIAE, Beijing, People’s Republic of China
	In this paper, the design and installation CYCIAE-230 superconducting cyclotron main vacuum system’s equipment and the cryogenic systems based on the liquid helium zero-boiling-off technology for the CYCIAE-230 superconducting cyclotrons are described. The vacuum in the particle acceleration cavity is 2x10^-4 Pa. The main technical features of the accelerator vacuum system are that the main magnet cover plate with diameter 3.12m are used as a part of the main vacuum chamber, 8 magnetic poles, 8 high frequency resonators, and 2 sets of striper targets and 2 sets of radial targets are installed in the main vacuum chamber, resulting in technical difficulties such as large surface gas discharge, virtual leakage, high leakage of magnetic flux at the installation position of vacuum equipment (up to 2000 gauss) and so on. The main vacuum system is designed as 9 sets of TMP with magnet shields installed on the valley of magnet poles, which also used as RF cavity.
	Poster MOPO007 [1.509 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-CYCLOTRONS2022-MOPO007
About •	Received ※ 06 February 2023 — Revised ※ 07 February 2023 — Accepted ※ 03 August 2023 — Issue date ※ 12 October 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPO017	A New Design of CYCIAE230 Superconducting Cyclotron RF-Driven System	237
	Z.G. Yin, X.L. Fu, B. Ji, X. Mu, S. Pei, J.Y. Wei, T.J. Zhang CIAE, Beijing, People’s Republic of China
	A superconducting cyclotron with a beam energy of 246.2MeV has been developed and commissioned by the China Institute of Atomic Energy. The RF system of the first CYCIAE-230 cyclotron adopts two tetrode amplifiers to drive the cavities simultaneously. The driven power is 180 degrees out of phase and each of the amplifiers was designed able to deliver 75kW RF power to the cavities. In practice, it was found that the driven power is beyond necessary and only 80kW RF power is required for the beam. Hence, an upgrade of the existing RF-driven system to the stare-of-art of solid-state technology is put forward by the CIAE cyclotron team. Furthermore, this alternative design also includes an optimization of the coupling between amplifiers and the cavities, since the old coupler shows nonidealities under long-term high-power operations. A driven schema utilizing multiple low-power capacitive couplers is designed to address this issue, taking advantage of the cavity as a power combiner. In this paper, a review of the existing RF-driven system will be given first. It will be followed by an analysis of the limitation of such a system in practice. A new design of the solid amplifier, the new driven method, and a capacitive window will also be reported.
DOI •	reference for this paper ※ doi:10.18429/JACoW-CYCLOTRONS2022-WEPO017
About •	Received ※ 25 December 2022 — Revised ※ 29 January 2023 — Accepted ※ 09 February 2023 — Issue date ※ 02 June 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

The Commissioning of a 230 MeV Superconducting Cyclotron CYCIAE-230

15

C. Wang, H.R. Cai, W.F. Fu, A.L. He, M.Z. Hu, B. Ji, L.Y. Ji, X.L. Jia, Y. Jia, T.Y. Jiang, J. Liu, J.Y. Liu, P. Liu, Z.W. Liu, X. Mu, S. Pei, G.F. Song, Q.Q. Song, F. Wang, J.Y. Wei, L.P. Wen, J.S. Xing, Z.G. Yin, D.Z. Zhang, S.P. Zhang, T.J. Zhang, X. Zheng, H. Zhou, P.F. Zhu, X.F. Zhu
CIAE, Beijing, People’s Republic of China

There are very strong demands for proton accelera-tors in medium energy range in recent years due to the fast growth of proton therapy and the space science in China. For the applications of proton therapy and pro-ton irradiation, the energy range of proton beam is usually from 200MeV to 250MeV, or even higher for astronavigation [1]. An R&D project for constructing a 230MeV superconducting cyclotron (CYCIAE-230) has been initiated at China Institute of Atomic Energy (CIAE) since Jan 2015. In July of 2016, after the fund-ing was approved by China National Nuclear Corpora-tion (CNNC), the construction project was fully launched. In Dec 2019, the superconducting main magnet and the RF system were transferred to the new-ly built commissioning site. Then, the RF commission-ing, ion source and central region test were performed even during the pandemic in early 2020. In September 2020, after finishing the commissioning tests of all subsystems, the beam was reached the extraction channel but with very low efficiency. Since then, with more efforts on beam diagnostics, the fine tuning of the beam phase and the adjusting of the superconduct-ing coil have been proven to be useful to get higher beam extraction efficiency ~55%. In this paper, the commissioning of the key components, including the main magnet, SC coils, internal ion source and central region, extraction system, etc, as well as the commis-sioning progress of the machine CYCIAE-230 will be presented.

Slides MOAO02 [10.305 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-CYCLOTRONS2022-MOAO02

About •

Received ※ 24 January 2023 — Revised ※ 25 January 2023 — Accepted ※ 09 February 2023 — Issue date ※ 10 June 2023

Cite •

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

MOPO007

The Design and Commission of Vacuum System for CYCIAE-230 Superconducting Cyclotron

66

S.P. Zhang, H.R. Cai, W.F. Fu, B. Ji, J.Y. Liu, G.F. Pan, C. Wang, Z.G. Yin, T.J. Zhang, H. Zhou, X.F. Zhu
CIAE, Beijing, People’s Republic of China

In this paper, the design and installation CYCIAE-230 superconducting cyclotron main vacuum system’s equipment and the cryogenic systems based on the liquid helium zero-boiling-off technology for the CYCIAE-230 superconducting cyclotrons are described. The vacuum in the particle acceleration cavity is 2x10^-4 Pa. The main technical features of the accelerator vacuum system are that the main magnet cover plate with diameter 3.12m are used as a part of the main vacuum chamber, 8 magnetic poles, 8 high frequency resonators, and 2 sets of striper targets and 2 sets of radial targets are installed in the main vacuum chamber, resulting in technical difficulties such as large surface gas discharge, virtual leakage, high leakage of magnetic flux at the installation position of vacuum equipment (up to 2000 gauss) and so on. The main vacuum system is designed as 9 sets of TMP with magnet shields installed on the valley of magnet poles, which also used as RF cavity.

Poster MOPO007 [1.509 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-CYCLOTRONS2022-MOPO007

About •

Received ※ 06 February 2023 — Revised ※ 07 February 2023 — Accepted ※ 03 August 2023 — Issue date ※ 12 October 2023

Cite •

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

WEPO017

A New Design of CYCIAE230 Superconducting Cyclotron RF-Driven System

237

Z.G. Yin, X.L. Fu, B. Ji, X. Mu, S. Pei, J.Y. Wei, T.J. Zhang
CIAE, Beijing, People’s Republic of China

A superconducting cyclotron with a beam energy of 246.2MeV has been developed and commissioned by the China Institute of Atomic Energy. The RF system of the first CYCIAE-230 cyclotron adopts two tetrode amplifiers to drive the cavities simultaneously. The driven power is 180 degrees out of phase and each of the amplifiers was designed able to deliver 75kW RF power to the cavities. In practice, it was found that the driven power is beyond necessary and only 80kW RF power is required for the beam. Hence, an upgrade of the existing RF-driven system to the stare-of-art of solid-state technology is put forward by the CIAE cyclotron team. Furthermore, this alternative design also includes an optimization of the coupling between amplifiers and the cavities, since the old coupler shows nonidealities under long-term high-power operations. A driven schema utilizing multiple low-power capacitive couplers is designed to address this issue, taking advantage of the cavity as a power combiner. In this paper, a review of the existing RF-driven system will be given first. It will be followed by an analysis of the limitation of such a system in practice. A new design of the solid amplifier, the new driven method, and a capacitive window will also be reported.

DOI •

reference for this paper ※ doi:10.18429/JACoW-CYCLOTRONS2022-WEPO017

About •

Received ※ 25 December 2022 — Revised ※ 29 January 2023 — Accepted ※ 09 February 2023 — Issue date ※ 02 June 2023

Cite •

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