ECRIS2020 - List of Authors (Feng, Y.C.)

Paper	Title	Page
MOWZO02	LECR5 Development and Status Report	6
	C. Qian, J.R. An, J.J. Chang, X. Fang, Y.C. Feng, J.W. Guo, Z.H. Jia, L.B. Li, W. Lu, J.D. Ma, Y.M. Ma, L.T. Sun, H. Wang, X.Z. Zhang, H.W. Zhao IMP/CAS, Lanzhou, People’s Republic of China C. Qian University of Chinese Academy of Sciences, Beijing, People’s Republic of China
	LECR5 (Lanzhou Electron Cyclotron Resonance ion source No. 5) is an 18 GHz room temperature ECR ion source featuring Ø80 mm ID (Internal Diameter) plasma chamber and high magnetic fields. It has been successfully constructed at IMP recently and has been fully commissioned to meet the requirements of SESRI (Space Environment Simulation and Research Infrastructure) project. According to the test results, LECR5 can meet the requirements of SESRI with sufficient beam intensities within the required the transverse emittances. As LECR5 is designed to be optimal for the operation at 18 GHz, we have managed to explore the source performance at 18 GHz with a maximum microwave power around 2 kW. Recent source test indicates, LECR5 can produce not only high intensity ion beams such as 2.12 emA O⁶⁺, 121 e’A of Ar¹⁴⁺, 73 e’A of Kr²³⁺, 145 e’A of Xe²⁷⁺, but also very high charge state ion beams such as 22 e’A of Bi⁴¹⁺. This paper will present the recent progress with LECR5, especially the intense ion beam production and the beam quality investigation.
	Slides MOWZO02 [5.886 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-MOWZO02
About •	Received ※ 27 September 2020 — Revised ※ 30 December 2020 — Accepted ※ 18 May 2021 — Issue date ※ 14 November 2021
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUWZO02	Tentative Solution to Plasma Chamber Cooling for High Power ECR Ion Source Operation
	J.W. Guo, Y.C. Feng, D. Hitz, W. Huang, J.B. Li, L.B. Li, L.X. Li, W. Lu, J.D. Ma, L.T. Sun, Y.Y. Yang, W.H. Zhang, X.Z. Zhang, H.W. Zhao IMP/CAS, Lanzhou, People’s Republic of China W. Huang, L.T. Sun UCAS, Beijing, People’s Republic of China
	High charge state electron cyclotron resonance ion source (ECRIS) is characterized by a so-called min-B magnetic field configuration, which provokes the localized plasma over-heating to plasma chamber especially for the 3rd generation ECRISs at high power operation condition. With the increase of rf power, more plasma energy will be dumped to tiny areas and result in a very high localized power density, which is estimated to be up to 1 kW/cm². Few existing ECR plasma chamber cooling designs can withstand such high heat fluxes. In this paper, we report a new plasma chamber cooling design with so-called Micro-channel cooling technology, which can not only realize efficient heat transfer, but also retains a small radial thickness that is beneficial for the radial magnetic field. In order to evaluate the performance of the cooling structure with micro-channel design, experimental cooling loop for high heat flux has been designed and built at IMP. Initial experiments demonstrate that optimized configuration can achieve high heat flux cooling in the range of 1 kW/cm² and beyond. Based on these results, a plasma chamber with micro-channel design for SECRAL has been designed and tested.
	Slides TUWZO02 [9.402 MB]
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TUWZO03	Production of Metallic Ion Beams with Inductive Heating Oven at Institute of Modern Physics	65
	W. Lu, Y.C. Feng, J.W. Guo, W. Huang, L.B. Li, L.X. Li, H.Y. Ma, J.D. Ma, C. Qian, L.T. Sun, W.H. Zhang, X.Z. Zhang, H.W. Zhao IMP/CAS, Lanzhou, People’s Republic of China W. Huang, L.T. Sun UCAS, Beijing, People’s Republic of China C. Qian University of Chinese Academy of Sciences, Beijing, People’s Republic of China
	A High-Temperature Oven (HTO) with inductive heating technology has been developed successfully in 2019 at Institute of Modern Physics. This oven features durable operation temperature of >2000’ inside the tantalum susceptor. By careful design the oven structure, material compatibility and thermal stress issues at high temperature has been successfully handled, which enables the production of >400 e’A U³³⁺ with SECRAL-II. With necessary refinement, this type of oven could also be available with room temperature ECR ion sources, like LECR4 and LECR5. Some improvements in structure have been proposed in this year. The design and testing results will be presented in this contribution. W. Lu, L. T. Sun, C. Qian, L. B. Li, J. W. Guo, W. Huang, X. Z. Zhang, and H. W. Zhao, Rev. Sci. Instrum. 90, 113318 (2019);
	Slides TUWZO03 [7.369 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-TUWZO03
About •	Received ※ 28 September 2020 — Revised ※ 30 December 2020 — Accepted ※ 18 May 2021 — Issue date ※ 08 October 2021
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEWZO06	Observation of Cyclotron Instabilities in SECRAL-II Ion Source
	L.X. Li, Y.C. Feng, J.W. Guo, D. Hitz, J.B. Li, W. Lu, L.T. Sun, W.H. Zhang, X.Z. Zhang, H.W. Zhao IMP/CAS, Lanzhou, People’s Republic of China
	Cyclotron instabilities in Electron Cyclotron Resonance Ion Source (ECRIS) plasmas are related to non-linear interaction between plasma waves and energetic electrons, resulting in strong microwave emission, a burst of energetic electrons escaping the plasma, and the periodic oscillations of the extracted beam currents. Precedent investigation of cyclotron instabilities has proved that Bmin/BECR can be treated as a magnetic field threshold. Recently, experiments with SECRAL-II ion source demonstrate that Bmin/BECR is not the only knob, and other field parameters have also been found to be related to cyclotron instabilities, such as mirror ratio and radial field. Namely, the trigger of cyclotron instability is a combination of many magnetic field parameters. This paper will give the experimental setup at IMP for cyclotron instability investigations and experimental observations will be presented.
	Slides WEWZO06 [1.021 MB]
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Paper

Title

Page

LECR5 Development and Status Report

6

C. Qian, J.R. An, J.J. Chang, X. Fang, Y.C. Feng, J.W. Guo, Z.H. Jia, L.B. Li, W. Lu, J.D. Ma, Y.M. Ma, L.T. Sun, H. Wang, X.Z. Zhang, H.W. Zhao
IMP/CAS, Lanzhou, People’s Republic of China
C. Qian
University of Chinese Academy of Sciences, Beijing, People’s Republic of China

LECR5 (Lanzhou Electron Cyclotron Resonance ion source No. 5) is an 18 GHz room temperature ECR ion source featuring Ø80 mm ID (Internal Diameter) plasma chamber and high magnetic fields. It has been successfully constructed at IMP recently and has been fully commissioned to meet the requirements of SESRI (Space Environment Simulation and Research Infrastructure) project. According to the test results, LECR5 can meet the requirements of SESRI with sufficient beam intensities within the required the transverse emittances. As LECR5 is designed to be optimal for the operation at 18 GHz, we have managed to explore the source performance at 18 GHz with a maximum microwave power around 2 kW. Recent source test indicates, LECR5 can produce not only high intensity ion beams such as 2.12 emA O⁶⁺, 121 e’A of Ar¹⁴⁺, 73 e’A of Kr²³⁺, 145 e’A of Xe²⁷⁺, but also very high charge state ion beams such as 22 e’A of Bi⁴¹⁺. This paper will present the recent progress with LECR5, especially the intense ion beam production and the beam quality investigation.

Slides MOWZO02 [5.886 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-MOWZO02

About •

Received ※ 27 September 2020 — Revised ※ 30 December 2020 — Accepted ※ 18 May 2021 — Issue date ※ 14 November 2021

Cite •

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

TUWZO02

Tentative Solution to Plasma Chamber Cooling for High Power ECR Ion Source Operation

J.W. Guo, Y.C. Feng, D. Hitz, W. Huang, J.B. Li, L.B. Li, L.X. Li, W. Lu, J.D. Ma, L.T. Sun, Y.Y. Yang, W.H. Zhang, X.Z. Zhang, H.W. Zhao
IMP/CAS, Lanzhou, People’s Republic of China
W. Huang, L.T. Sun
UCAS, Beijing, People’s Republic of China

High charge state electron cyclotron resonance ion source (ECRIS) is characterized by a so-called min-B magnetic field configuration, which provokes the localized plasma over-heating to plasma chamber especially for the 3rd generation ECRISs at high power operation condition. With the increase of rf power, more plasma energy will be dumped to tiny areas and result in a very high localized power density, which is estimated to be up to 1 kW/cm². Few existing ECR plasma chamber cooling designs can withstand such high heat fluxes. In this paper, we report a new plasma chamber cooling design with so-called Micro-channel cooling technology, which can not only realize efficient heat transfer, but also retains a small radial thickness that is beneficial for the radial magnetic field. In order to evaluate the performance of the cooling structure with micro-channel design, experimental cooling loop for high heat flux has been designed and built at IMP. Initial experiments demonstrate that optimized configuration can achieve high heat flux cooling in the range of 1 kW/cm² and beyond. Based on these results, a plasma chamber with micro-channel design for SECRAL has been designed and tested.

Slides TUWZO02 [9.402 MB]

Cite •

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

TUWZO03

Production of Metallic Ion Beams with Inductive Heating Oven at Institute of Modern Physics

65

W. Lu, Y.C. Feng, J.W. Guo, W. Huang, L.B. Li, L.X. Li, H.Y. Ma, J.D. Ma, C. Qian, L.T. Sun, W.H. Zhang, X.Z. Zhang, H.W. Zhao
IMP/CAS, Lanzhou, People’s Republic of China
W. Huang, L.T. Sun
UCAS, Beijing, People’s Republic of China
C. Qian
University of Chinese Academy of Sciences, Beijing, People’s Republic of China

A High-Temperature Oven (HTO) with inductive heating technology has been developed successfully in 2019 at Institute of Modern Physics. This oven features durable operation temperature of >2000’ inside the tantalum susceptor. By careful design the oven structure, material compatibility and thermal stress issues at high temperature has been successfully handled, which enables the production of >400 e’A U³³⁺ with SECRAL-II*. With necessary refinement, this type of oven could also be available with room temperature ECR ion sources, like LECR4 and LECR5. Some improvements in structure have been proposed in this year. The design and testing results will be presented in this contribution.
*W. Lu, L. T. Sun, C. Qian, L. B. Li, J. W. Guo, W. Huang, X. Z. Zhang, and H. W. Zhao, Rev. Sci. Instrum. 90, 113318 (2019);

Slides TUWZO03 [7.369 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-TUWZO03

About •

Received ※ 28 September 2020 — Revised ※ 30 December 2020 — Accepted ※ 18 May 2021 — Issue date ※ 08 October 2021

Cite •

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

WEWZO06

Observation of Cyclotron Instabilities in SECRAL-II Ion Source

L.X. Li, Y.C. Feng, J.W. Guo, D. Hitz, J.B. Li, W. Lu, L.T. Sun, W.H. Zhang, X.Z. Zhang, H.W. Zhao
IMP/CAS, Lanzhou, People’s Republic of China

Cyclotron instabilities in Electron Cyclotron Resonance Ion Source (ECRIS) plasmas are related to non-linear interaction between plasma waves and energetic electrons, resulting in strong microwave emission, a burst of energetic electrons escaping the plasma, and the periodic oscillations of the extracted beam currents. Precedent investigation of cyclotron instabilities has proved that Bmin/BECR can be treated as a magnetic field threshold. Recently, experiments with SECRAL-II ion source demonstrate that Bmin/BECR is not the only knob, and other field parameters have also been found to be related to cyclotron instabilities, such as mirror ratio and radial field. Namely, the trigger of cyclotron instability is a combination of many magnetic field parameters. This paper will give the experimental setup at IMP for cyclotron instability investigations and experimental observations will be presented.

Slides WEWZO06 [1.021 MB]

Cite •

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