CYCLOTRONS2022 - List of Keywords (ECR)

Paper	Title	Other Keywords	Page
MOAI01	Status of the HIAF Accelerator Facility in China	injection, extraction, linac, vacuum	1
	J.C. Yang, L.T. Sun, Y.J. Yuan IMP/CAS, Lanzhou, People’s Republic of China
	HIAF (High Intensity heavy ion Accelerator Facility) is a new accelerator facility for advances in the nuclear physics and related research fields in China. It is composed of a superconducting ion linear accelerator, a high-energy synchrotron booster, a high-energy radioactive isotope beam line, an experimental storage ring, and a few experimental setups. Characterized by unprecedented intense ion beams from hydrogen through uranium, HIAF can produce a large variety of exotic nuclear matters not normally found on the earth and will bring researchers to the forefront of promoting the most vigorous and fascinating fields in nuclear physics. In addition, HIAF will provide an excellent platform to develop heavy-ion applications in medicine, life science, space science, and material science. The construction of HIAF started up in December of 2018, and takes approximately seven years in total. Since the commencement, the civil engineering and infrastructure are being constructed on time schedule and will be completed in July, 2023. R&D on key accelerator techniques are going on successfully, and prototypes of core devices are fabricated in collaboration with home and abroad universities, institutes, and companies. Presently, we come to the stage of invitation for bids and volume production of various apparatuses. The progress and present status will be given in the presentation.
	Slides MOAI01 [7.656 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-CYCLOTRONS2022-MOAI01
About •	Received ※ 29 January 2023 — Revised ※ 10 February 2023 — Accepted ※ 14 February 2023 — Issue date ※ 25 April 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOBO04	Experimental Study on Proton Irradiation Effect of Gallium Nitride High Electron Mobility Transistor	proton, radiation, experiment, electron	42
	z. Zhang, Q. Chen, G. Guo, C.C. Liu CIAE, Beijing, People’s Republic of China
	As a third-generation semiconductor material, gallium nitride (GaN) has the advantages of high breakdown electric field, high electron saturation speed, high operating temperature and strong radiation resistance, and has broad application prospects in the aerospace field. As an important member of GaN-based electronic devices, GaN high electron mobility transistor (HEMT) is widely considered to be used in the power supply and other important systems of spacecraft. Therefore, GaN HEMT is of great significance for spacecraft to complete relevant setting tasks. However, GaN HEMT will inevitably be affected by space radiation environment when spacecraft perform related missions. Previous researches have shown that protons are the majority of high-energy particles in space environment. Therefore, relevant studies should focus on the effect of proton irradiation on the performance of GaN HEMT. Using 100 MeV high-current proton cyclotron, we investigated the proton irradiation effect of GaN HEMT, and proved the effect of proton energy on static electrical parameters of GaN. The research work in this paper lays a foundation for the future application of GaN HEMT in space missions.
	Slides MOBO04 [2.860 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-CYCLOTRONS2022-MOBO04
About •	Received ※ 15 December 2022 — Revised ※ 14 February 2023 — Accepted ※ 17 February 2023 — Issue date ※ 18 April 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPO003	Sawtooth Wave Buncher Upgrade for SFC Cyclotron	cyclotron, bunching, injection, operation	51
	R. Zhang, X.M. Su, X.W. Wang, Z. Xu IMP/CAS, Lanzhou, People’s Republic of China
	To increase extracted beam intensity, the SFC cyclotron requires that the sawtooth wave buncher on its injection line provide the effective voltage up to 2.5kV and cover a wide frequency range of six times. We develope a multi-harmonic synthesis method by combining a broadband amplifier and impedance transformer, which provide a high-voltage single-gap buncher at limited space and cost. With this method, the maximum voltage of the new buncher exceeds 2.5kV and the beam intensity increases by a factor of 6.7.
	Poster MOPO003 [1.092 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-CYCLOTRONS2022-MOPO003
About •	Received ※ 04 December 2022 — Revised ※ 12 February 2023 — Accepted ※ 22 February 2023 — Issue date ※ 25 August 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPO006	Development of High Temperature Superconducting ECR Ion Source Using REBCO Coils	operation, plasma, solenoid, sextupole	62
	T.H. Chong, M. Fukuda, T. Hara, H. Kanda, M. Kittaka, S. Matsui, K. Takeda, Y. Yasuda, T. Yorita, H. Zhao RCNP, Osaka, Japan S. Fukui Niigata University, Niigata, Japan T. Hirayama, Y. Matsubara, Y. Mikami, T. Takahashi, J. Yoshida SHI, Kanagawa, Japan A. Ishiyama Waseda University, Tokyo, Japan S. Noguchi Hokkaido University, Sapporo, Japan H. Ueda Okayama University, Okayama, Japan T. Watabe Chuba, Aichi, Japan
	A high temperature superconducting ECR ion source (HTS-ECR) using REBCO coils is under development in Research Center for Nuclear Physics(RCNP), Osaka University. REBCO tapes are the second-generation high temperature superconductor, which maintains a high critical current even being placed in a strong external magnetic field. Using this REBCO coils as electromagnets, the HTS-ECR was designed to operate at microwave frequencies of 2.45 GHz and 10 GHz, for the purpose of producing high intensity proton, deuteron and helium beams. In this work, the low-temperature performance test results of the REBCO coils will be presented. The coil system and plasma chamber designed for the HTS-ECR will also be discussed. Results yielded in this research will also be made the best use of the development of a skeleton cyclotron, a compact air-core cyclotron which is under development in RCNP, Osaka University.
	Poster MOPO006 [3.590 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-CYCLOTRONS2022-MOPO006
About •	Received ※ 21 December 2022 — Revised ※ 11 January 2023 — Accepted ※ 01 February 2023 — Issue date ※ 26 May 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPO017	RF Cavity Resonant Control Using Mimimal Seeking Sliding Mode Controller	controls, cavity, ISAC, DTL	99
	K. Fong, T. Au, X.L. Fu, R. Leewe, Q. Zheng TRIUMF, Vancouver, Canada
	Accelerating RF normal conducting cavities having Quality Factors of over 10³. These cavities must be constantly tuned to maintain resonance for maximum power efficiency. Traditional tuning method uses ’phase comparison method’ by monitoring the phase shift across the input and output of the cavity. This method suffers from phase drift due to diurnal temperature variations. Since 2017, TRIUMF ISAC-1 cavities are tuned using minimal seeking sliding mode controllers, which eliminate effects drift due to temperature changes. As with all extremum seeking algorithm, chattering is invariable present in the system, especially near the end-stage. This paper also includes a new chattering suppression method known as ’skipping surface’, which is slated to be installed in ISAC-1 LLRF upgrade in 2023.
	Poster MOPO017 [0.969 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-CYCLOTRONS2022-MOPO017
About •	Received ※ 26 December 2022 — Revised ※ 12 January 2023 — Accepted ※ 01 February 2023 — Issue date ※ 25 May 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEBO01	Bench to Bedside: Translational Nuclear Medicine Research and Clinical Theranostics in PUMCH	target, controls, HOM, data-analysis	179
	L.H. Huo PUMCH, Beijing, People’s Republic of China
	PUMCH was founded In 1921. In 1958, PUMCH established the first nuclear medicine department in the country which eventually became the most comprehensive unit of nuclear medicine in China. The department has topped the ranking in "China’s Hospital Rankings" for consecutively 7 years and has done great efforts in translational research of nuclear medicine and molecular imaging. By now, over 10 isotopes and 100 radiopharmaceuticals are employed to support routine clinical work and more than 50 research projects as well, involving theranostic and preclinical exploration. These research achievements were highly glorified in the top international conferences and journals. The department not only keeps up with the advanced medical technologies in the world but also indulges in promoting novel technology applications in domestic hospitals. After a 60 years journey, the department of nuclear medicine in PUMCH with her superior capability will continuously lead nuclear medicine exploration and development in China. The department will begin another new and prosperous journey in the new era.
	Slides WEBO01 [17.823 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-CYCLOTRONS2022-WEBO01
About •	Received ※ 22 May 2023 — Revised ※ 04 June 2023 — Accepted ※ 06 July 2023 — Issue date ※ 20 July 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPO016	A New 18 GHz ECR Ion Source for Cyclotron at CIAE	ion-source, cyclotron, electron, injection	234
	B. Tang, L.H. Chen, B.Q. Cui, G. Guo, R. Ma, Y.J. Ma, L. Sui, Y.F. Wang, L. Zhang CIAE, Beijing, People’s Republic of China Z.H. Jia, L.B. Li, Y.T. Li, W. Lu, J.D. Ma, P. Peng, C. Qian, L.T. Sun, P. Zhang, X.Z. Zhang IMP/CAS, Lanzhou, People’s Republic of China
	In order to meet the requirements of ion beam for the single event effect experiment, the ion source needs to supply ion beams of N, Ne, Si, Ar, Fe, Kr, Xe, and so on for the cyclotron. The most effective way to increase the energy of the cyclotron is to increase the charged state, and the Kr ion charge state reaches +22 while the Xe ion charge state reaches +35. A new room-temperature Electron Cyclotron Resonance (ECR) ion source operating at 18 GHz has been developed and assembled at CIAE. This new ECR ion source is based on the Lanzhou Electron Cyclotron Resonance ion source No.5 (LECR5) developed at IMP. The magnetic confinement of the new ECR ion source is realized by the axial mirror field provided by two set of room temperature pancake coils while the radial hexapole field is supplied by a permanent magnet hexapole. A multi-sputter disk injection component was designed for the production of metallic cocktail ion beams. This paper will give the detailed design of this ion source, and some preliminary highly charged ion beam production results will also be presented.
	Poster WEPO016 [0.654 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-CYCLOTRONS2022-WEPO016
About •	Received ※ 11 February 2023 — Revised ※ 13 February 2023 — Accepted ※ 20 February 2023 — Issue date ※ 01 July 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THBI02	Status Report on the Cyclotron Injector for HIMM	cyclotron, operation, extraction, ion-source	269
	G.L. Dou, X. Chen, C.C. Li, L.T. Sun, B. Wang, X.W. Wang, L. Yang, Q.G. Yao, H.W. Zhao IMP/CAS, Lanzhou, People’s Republic of China
	HIMM (Heavy Ion Medical Machine) is an accelerator complex designed by Institute of Modern Physics, CAS, which accelerates carbon ions to the energy 400 MeV/A for tumor therapy. The main accelerator of HIMM is a synchronous accelerator. As a special design, we use a cyclotron as the injector of the synchrontron. The cyclotron is a compact cyclotron to accelerate C¹²⁵⁺ ions to the energy 6.8 MeV/A, and the extracted beam intensity of the cyclotron is 10 eµA. For stability and simplicity operation, we use two identical permanent magnet ECR ion sources in the axial injection line, that the ion sources can interchange with each other rapidly with the same performance, and only one main exciting coil with no trim coils in the cyclotron magnet. Up to now, three cyclotrons have been accomplished, one of them was operated in Gansu Wuwei Tumor Hospital to treat more than six hundred cancer patients in the last two and a half years, the other one had been fully commissioned in Lanzhou Heavy Ion Hospital about two years ago. After a short introduction to the heavy ion cancer treatment facility development in China, this paper will present operation status of the cyclotrons for HIMM. Typical performance and on-line operation reliability will be discussed.
	Slides THBI02 [2.031 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-CYCLOTRONS2022-THBI02
About •	Received ※ 07 December 2022 — Revised ※ 24 July 2023 — Accepted ※ 03 August 2023 — Issue date ※ 13 October 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPO002	Study on Proton Radiation Effect and Self-Repair of SiC-JBS Diodes	radiation, proton, interface, electron	291
	C.C. Liu, Q. Chen, G. Guo, H.L. Shi, F.Q. Zhang, z. Zhang CIAE, Beijing, People’s Republic of China
	Funding: CNNC "Young Talents" Scientific Research Project (11FY212306000801) In this study, the influence of proton irradiation experiments at 40 MeV and p/cm² on Silicon Carbide Junction Barrier Schottky (SiC-JBS) diodes with stripe cell and hexagonal cell designs was investigated, respectively. Considering the displacement damage effect of SiC-JBS diodes, the experiments was implemented on unbiased SiC-JBS diodes based on 100 MeV high intensity proton cyclotron of China Institute of Atomic Energy. The results show that the current voltage (IV) and capacitive voltage (CV) characteristics of the SiC-JBS diodes are obviously degraded by proton irradiation. After 168 h of room temperature annealing, the forward IV characteristics of the SiC-JBS diodes are basically restored but the reverse leakage current is increased. After 336 h of room temperature annealing, the forward IV characteristic of the diodes is completely restored, but the reserve IV characteristic of the diodes with stripe cell is completely restored. And the CV characteristic is degraded of the two kinds of SiC-JBS diodes permanently, which indicating that room temperature annealing cannot restore the proton radiation displacement damage defects. Combined with Monte Carlo simulations, it is shown that proton irradiation will introduce ionization defects and displacement defects into the SiC-JBS diodes, in which the disappearance of displacement damage defects will eventually lead to the degradation of electrical properties of reverse IV and CV. The analysis of the SiC-JBS diodes structure shows that, without considering the diode materials and process level, the SiC-JBS diode with hexagonal cells is more resistant to proton irradiation displacement damage and has stronger room temperature annealing self-repair ability than the SiC-JBS diodes with stripe cells, even though its chip area is smaller. On the other hand, the SiC-JBS diodes with hexagonal cells can be used preferentially in the radiation environment where there is a large amount of proton.
	Poster THPO002 [5.018 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-CYCLOTRONS2022-THPO002
About •	Received ※ 21 December 2022 — Revised ※ 21 January 2023 — Accepted ※ 14 March 2023 — Issue date ※ 14 April 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPO019	Control of a Cyclotron and an ECR Ion Source Using Bayesian Optimization Method	experiment, ion-source, brightness, LEBT	347
	Y. Morita, M. Fukuda, H. Kanda, T. Yorita RCNP, Osaka, Japan T. Washio ISIR, Osaka, Japan
	An enormous number of parameters are tuned during accelerator operation. The tuning is ultimately dependent on the operator’s knowledge and experience. Therefore, there is a risk that tuning time and accuracy may vary depending on the operator. This tuning difficulty is an extremely important issue when implementing accelerometers in society, such as in medical applications. In this study, we developed an automatic tuning method using Bayesian optimization, one of the machine learning technique. The aim is to realize a tuning method that can supply beams in a short time with good reproducibility and comparable to manual tuning.
	Poster THPO019 [0.700 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-CYCLOTRONS2022-THPO019
About •	Received ※ 21 December 2022 — Revised ※ 29 January 2023 — Accepted ※ 09 February 2023 — Issue date ※ 12 February 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Other Keywords

Page

MOAI01

Status of the HIAF Accelerator Facility in China

injection, extraction, linac, vacuum

1

J.C. Yang, L.T. Sun, Y.J. Yuan
IMP/CAS, Lanzhou, People’s Republic of China

HIAF (High Intensity heavy ion Accelerator Facility) is a new accelerator facility for advances in the nuclear physics and related research fields in China. It is composed of a superconducting ion linear accelerator, a high-energy synchrotron booster, a high-energy radioactive isotope beam line, an experimental storage ring, and a few experimental setups. Characterized by unprecedented intense ion beams from hydrogen through uranium, HIAF can produce a large variety of exotic nuclear matters not normally found on the earth and will bring researchers to the forefront of promoting the most vigorous and fascinating fields in nuclear physics. In addition, HIAF will provide an excellent platform to develop heavy-ion applications in medicine, life science, space science, and material science. The construction of HIAF started up in December of 2018, and takes approximately seven years in total. Since the commencement, the civil engineering and infrastructure are being constructed on time schedule and will be completed in July, 2023. R&D on key accelerator techniques are going on successfully, and prototypes of core devices are fabricated in collaboration with home and abroad universities, institutes, and companies. Presently, we come to the stage of invitation for bids and volume production of various apparatuses. The progress and present status will be given in the presentation.

Slides MOAI01 [7.656 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-CYCLOTRONS2022-MOAI01

About •

Received ※ 29 January 2023 — Revised ※ 10 February 2023 — Accepted ※ 14 February 2023 — Issue date ※ 25 April 2023

Cite •

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

MOBO04

Experimental Study on Proton Irradiation Effect of Gallium Nitride High Electron Mobility Transistor

proton, radiation, experiment, electron

42

z. Zhang, Q. Chen, G. Guo, C.C. Liu
CIAE, Beijing, People’s Republic of China

As a third-generation semiconductor material, gallium nitride (GaN) has the advantages of high breakdown electric field, high electron saturation speed, high operating temperature and strong radiation resistance, and has broad application prospects in the aerospace field. As an important member of GaN-based electronic devices, GaN high electron mobility transistor (HEMT) is widely considered to be used in the power supply and other important systems of spacecraft. Therefore, GaN HEMT is of great significance for spacecraft to complete relevant setting tasks. However, GaN HEMT will inevitably be affected by space radiation environment when spacecraft perform related missions. Previous researches have shown that protons are the majority of high-energy particles in space environment. Therefore, relevant studies should focus on the effect of proton irradiation on the performance of GaN HEMT. Using 100 MeV high-current proton cyclotron, we investigated the proton irradiation effect of GaN HEMT, and proved the effect of proton energy on static electrical parameters of GaN. The research work in this paper lays a foundation for the future application of GaN HEMT in space missions.

Slides MOBO04 [2.860 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-CYCLOTRONS2022-MOBO04

About •

Received ※ 15 December 2022 — Revised ※ 14 February 2023 — Accepted ※ 17 February 2023 — Issue date ※ 18 April 2023

Cite •

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

MOPO003

Sawtooth Wave Buncher Upgrade for SFC Cyclotron

cyclotron, bunching, injection, operation

51

R. Zhang, X.M. Su, X.W. Wang, Z. Xu
IMP/CAS, Lanzhou, People’s Republic of China

To increase extracted beam intensity, the SFC cyclotron requires that the sawtooth wave buncher on its injection line provide the effective voltage up to 2.5kV and cover a wide frequency range of six times. We develope a multi-harmonic synthesis method by combining a broadband amplifier and impedance transformer, which provide a high-voltage single-gap buncher at limited space and cost. With this method, the maximum voltage of the new buncher exceeds 2.5kV and the beam intensity increases by a factor of 6.7.

Poster MOPO003 [1.092 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-CYCLOTRONS2022-MOPO003

About •

Received ※ 04 December 2022 — Revised ※ 12 February 2023 — Accepted ※ 22 February 2023 — Issue date ※ 25 August 2023

Cite •

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

MOPO006

Development of High Temperature Superconducting ECR Ion Source Using REBCO Coils

operation, plasma, solenoid, sextupole

62

T.H. Chong, M. Fukuda, T. Hara, H. Kanda, M. Kittaka, S. Matsui, K. Takeda, Y. Yasuda, T. Yorita, H. Zhao
RCNP, Osaka, Japan
S. Fukui
Niigata University, Niigata, Japan
T. Hirayama, Y. Matsubara, Y. Mikami, T. Takahashi, J. Yoshida
SHI, Kanagawa, Japan
A. Ishiyama
Waseda University, Tokyo, Japan
S. Noguchi
Hokkaido University, Sapporo, Japan
H. Ueda
Okayama University, Okayama, Japan
T. Watabe
Chuba, Aichi, Japan

A high temperature superconducting ECR ion source (HTS-ECR) using REBCO coils is under development in Research Center for Nuclear Physics(RCNP), Osaka University. REBCO tapes are the second-generation high temperature superconductor, which maintains a high critical current even being placed in a strong external magnetic field. Using this REBCO coils as electromagnets, the HTS-ECR was designed to operate at microwave frequencies of 2.45 GHz and 10 GHz, for the purpose of producing high intensity proton, deuteron and helium beams. In this work, the low-temperature performance test results of the REBCO coils will be presented. The coil system and plasma chamber designed for the HTS-ECR will also be discussed. Results yielded in this research will also be made the best use of the development of a skeleton cyclotron, a compact air-core cyclotron which is under development in RCNP, Osaka University.

Poster MOPO006 [3.590 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-CYCLOTRONS2022-MOPO006

About •

Received ※ 21 December 2022 — Revised ※ 11 January 2023 — Accepted ※ 01 February 2023 — Issue date ※ 26 May 2023

Cite •

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

MOPO017

RF Cavity Resonant Control Using Mimimal Seeking Sliding Mode Controller

controls, cavity, ISAC, DTL

99

K. Fong, T. Au, X.L. Fu, R. Leewe, Q. Zheng
TRIUMF, Vancouver, Canada

Accelerating RF normal conducting cavities having Quality Factors of over 10³. These cavities must be constantly tuned to maintain resonance for maximum power efficiency. Traditional tuning method uses ’phase comparison method’ by monitoring the phase shift across the input and output of the cavity. This method suffers from phase drift due to diurnal temperature variations. Since 2017, TRIUMF ISAC-1 cavities are tuned using minimal seeking sliding mode controllers, which eliminate effects drift due to temperature changes. As with all extremum seeking algorithm, chattering is invariable present in the system, especially near the end-stage. This paper also includes a new chattering suppression method known as ’skipping surface’, which is slated to be installed in ISAC-1 LLRF upgrade in 2023.

Poster MOPO017 [0.969 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-CYCLOTRONS2022-MOPO017

About •

Received ※ 26 December 2022 — Revised ※ 12 January 2023 — Accepted ※ 01 February 2023 — Issue date ※ 25 May 2023

Cite •

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

WEBO01

Bench to Bedside: Translational Nuclear Medicine Research and Clinical Theranostics in PUMCH

target, controls, HOM, data-analysis

179

L.H. Huo
PUMCH, Beijing, People’s Republic of China

PUMCH was founded In 1921. In 1958, PUMCH established the first nuclear medicine department in the country which eventually became the most comprehensive unit of nuclear medicine in China. The department has topped the ranking in "China’s Hospital Rankings" for consecutively 7 years and has done great efforts in translational research of nuclear medicine and molecular imaging. By now, over 10 isotopes and 100 radiopharmaceuticals are employed to support routine clinical work and more than 50 research projects as well, involving theranostic and preclinical exploration. These research achievements were highly glorified in the top international conferences and journals. The department not only keeps up with the advanced medical technologies in the world but also indulges in promoting novel technology applications in domestic hospitals. After a 60 years journey, the department of nuclear medicine in PUMCH with her superior capability will continuously lead nuclear medicine exploration and development in China. The department will begin another new and prosperous journey in the new era.

Slides WEBO01 [17.823 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-CYCLOTRONS2022-WEBO01

About •

Received ※ 22 May 2023 — Revised ※ 04 June 2023 — Accepted ※ 06 July 2023 — Issue date ※ 20 July 2023

Cite •

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

WEPO016

A New 18 GHz ECR Ion Source for Cyclotron at CIAE

ion-source, cyclotron, electron, injection

234

B. Tang, L.H. Chen, B.Q. Cui, G. Guo, R. Ma, Y.J. Ma, L. Sui, Y.F. Wang, L. Zhang
CIAE, Beijing, People’s Republic of China
Z.H. Jia, L.B. Li, Y.T. Li, W. Lu, J.D. Ma, P. Peng, C. Qian, L.T. Sun, P. Zhang, X.Z. Zhang
IMP/CAS, Lanzhou, People’s Republic of China

In order to meet the requirements of ion beam for the single event effect experiment, the ion source needs to supply ion beams of N, Ne, Si, Ar, Fe, Kr, Xe, and so on for the cyclotron. The most effective way to increase the energy of the cyclotron is to increase the charged state, and the Kr ion charge state reaches +22 while the Xe ion charge state reaches +35. A new room-temperature Electron Cyclotron Resonance (ECR) ion source operating at 18 GHz has been developed and assembled at CIAE. This new ECR ion source is based on the Lanzhou Electron Cyclotron Resonance ion source No.5 (LECR5) developed at IMP. The magnetic confinement of the new ECR ion source is realized by the axial mirror field provided by two set of room temperature pancake coils while the radial hexapole field is supplied by a permanent magnet hexapole. A multi-sputter disk injection component was designed for the production of metallic cocktail ion beams. This paper will give the detailed design of this ion source, and some preliminary highly charged ion beam production results will also be presented.

Poster WEPO016 [0.654 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-CYCLOTRONS2022-WEPO016

About •

Received ※ 11 February 2023 — Revised ※ 13 February 2023 — Accepted ※ 20 February 2023 — Issue date ※ 01 July 2023

Cite •

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

THBI02

Status Report on the Cyclotron Injector for HIMM

cyclotron, operation, extraction, ion-source

269

G.L. Dou, X. Chen, C.C. Li, L.T. Sun, B. Wang, X.W. Wang, L. Yang, Q.G. Yao, H.W. Zhao
IMP/CAS, Lanzhou, People’s Republic of China

HIMM (Heavy Ion Medical Machine) is an accelerator complex designed by Institute of Modern Physics, CAS, which accelerates carbon ions to the energy 400 MeV/A for tumor therapy. The main accelerator of HIMM is a synchronous accelerator. As a special design, we use a cyclotron as the injector of the synchrontron. The cyclotron is a compact cyclotron to accelerate C¹²⁵⁺ ions to the energy 6.8 MeV/A, and the extracted beam intensity of the cyclotron is 10 eµA. For stability and simplicity operation, we use two identical permanent magnet ECR ion sources in the axial injection line, that the ion sources can interchange with each other rapidly with the same performance, and only one main exciting coil with no trim coils in the cyclotron magnet. Up to now, three cyclotrons have been accomplished, one of them was operated in Gansu Wuwei Tumor Hospital to treat more than six hundred cancer patients in the last two and a half years, the other one had been fully commissioned in Lanzhou Heavy Ion Hospital about two years ago. After a short introduction to the heavy ion cancer treatment facility development in China, this paper will present operation status of the cyclotrons for HIMM. Typical performance and on-line operation reliability will be discussed.

Slides THBI02 [2.031 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-CYCLOTRONS2022-THBI02

About •

Received ※ 07 December 2022 — Revised ※ 24 July 2023 — Accepted ※ 03 August 2023 — Issue date ※ 13 October 2023

Cite •

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

THPO002

Study on Proton Radiation Effect and Self-Repair of SiC-JBS Diodes

radiation, proton, interface, electron

291

C.C. Liu, Q. Chen, G. Guo, H.L. Shi, F.Q. Zhang, z. Zhang
CIAE, Beijing, People’s Republic of China

Funding: CNNC "Young Talents" Scientific Research Project (11FY212306000801)
In this study, the influence of proton irradiation experiments at 40 MeV and p/cm² on Silicon Carbide Junction Barrier Schottky (SiC-JBS) diodes with stripe cell and hexagonal cell designs was investigated, respectively. Considering the displacement damage effect of SiC-JBS diodes, the experiments was implemented on unbiased SiC-JBS diodes based on 100 MeV high intensity proton cyclotron of China Institute of Atomic Energy. The results show that the current voltage (IV) and capacitive voltage (CV) characteristics of the SiC-JBS diodes are obviously degraded by proton irradiation. After 168 h of room temperature annealing, the forward IV characteristics of the SiC-JBS diodes are basically restored but the reverse leakage current is increased. After 336 h of room temperature annealing, the forward IV characteristic of the diodes is completely restored, but the reserve IV characteristic of the diodes with stripe cell is completely restored. And the CV characteristic is degraded of the two kinds of SiC-JBS diodes permanently, which indicating that room temperature annealing cannot restore the proton radiation displacement damage defects. Combined with Monte Carlo simulations, it is shown that proton irradiation will introduce ionization defects and displacement defects into the SiC-JBS diodes, in which the disappearance of displacement damage defects will eventually lead to the degradation of electrical properties of reverse IV and CV. The analysis of the SiC-JBS diodes structure shows that, without considering the diode materials and process level, the SiC-JBS diode with hexagonal cells is more resistant to proton irradiation displacement damage and has stronger room temperature annealing self-repair ability than the SiC-JBS diodes with stripe cells, even though its chip area is smaller. On the other hand, the SiC-JBS diodes with hexagonal cells can be used preferentially in the radiation environment where there is a large amount of proton.

Poster THPO002 [5.018 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-CYCLOTRONS2022-THPO002

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Received ※ 21 December 2022 — Revised ※ 21 January 2023 — Accepted ※ 14 March 2023 — Issue date ※ 14 April 2023

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THPO019

Control of a Cyclotron and an ECR Ion Source Using Bayesian Optimization Method

experiment, ion-source, brightness, LEBT

347

Y. Morita, M. Fukuda, H. Kanda, T. Yorita
RCNP, Osaka, Japan
T. Washio
ISIR, Osaka, Japan

An enormous number of parameters are tuned during accelerator operation. The tuning is ultimately dependent on the operator’s knowledge and experience. Therefore, there is a risk that tuning time and accuracy may vary depending on the operator. This tuning difficulty is an extremely important issue when implementing accelerometers in society, such as in medical applications. In this study, we developed an automatic tuning method using Bayesian optimization, one of the machine learning technique. The aim is to realize a tuning method that can supply beams in a short time with good reproducibility and comparable to manual tuning.

Poster THPO019 [0.700 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-CYCLOTRONS2022-THPO019

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Received ※ 21 December 2022 — Revised ※ 29 January 2023 — Accepted ※ 09 February 2023 — Issue date ※ 12 February 2023

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