ECRIS-2014 - List of Authors (Zhao, H.W.)

Paper

Title

Page

MOOMMH01

How Can an ECRIS Meet Requirement of the Next Generation Heavy Ion Accelerator Facility

H.W. Zhao, L.T. Sun
IMP, Lanzhou, People's Republic of China

Driven by the requirement of nuclear physics research, a few next generation heavy ion accelerator facilities have been proposed such as GSI-FAIR, IMP-HIAF, JINR-NICA and JLAB-MEIC which require ion source to produce very intense pulsed-highly-charged heavy ion beams such as Au³²⁺,U²⁸⁺ and U³⁵⁺ with beam current 10¹¹ particles per pulse. With more intense higher charge state heavy ion beam produced, the design and building of such a heavy ion accelerator complex will be more cost effective and more compact. This is a big challenge and also an opportunity for ECR ion source development. However, how can an ECR ion source compete with other ion sources such as EBIS, LIS and MEVVA ion sources to meet requirement of the next generation heavy ion accelerator complex? The potential performance of the next generation ECRISs working at the frequency 40~60 GHz and comparison with other possible ion sources will be presented. This paper will have a detailed discussion of the foreseen challenges of the next generation ECRISs and impact on the next generation heavy ion acclerator complex as well.

Slides MOOMMH01 [2.333 MB]

MOPPH009

Status of IMP Permanent Magnet Proton Source for CI-ADS Project

Q. Wu, H.Y. Ma, L.T. Sun, Y. Yang, X.Z. Zhang, Z.M. Zhang, H.W. Zhao
IMP, Lanzhou, People's Republic of China

To produce the requested 10 mA proton beam for the China Initiative Accelerator Driven Sub-critical reactor Linac (CI-ADS), electron cyclotron resonance (ECR) ion sources operating at 2.45 GHz have been developed. The CI-ADS proton source developed at IMP can produced stable 35 keV/10 mA continuous wave (cw) beam at the RFQ entrance. The proton beam extracted by a 3-electrode extraction system passes through a low energy beam transport system (LEBT), which is composed of identical solenoids, into the 3.2 MeV radio-frequency quadrupole (RFQ). In order to ensure superconducting cavities commissioning and protection, an electrostatic-chopper has been designed and installed in the LEBT line that can chop the cw beam into a pulsed one. The achieved fall/rise time of the chopper is less than 20 ns. In this paper, the performance of the proton source and the LEBT, such as beam reliability, emittance and beam current tuning will be presented.

MOPPH010

Development of a 14 GHz High Intensity Proton Source

W.H. Zhang, Y.C. Feng, J.W. Guo, X.X. Li, H.Y. Ma, C. Qian, L.T. Sun, Q. Wu, H.J. Zhang, X.Z. Zhang, Z.M. Zhang, H.W. Zhao
IMP, Lanzhou, People's Republic of China

A high intensity ECR proton source with 14 GHz microwave heating was successfully developed at IMP. The idea of the working mechanism and the structure of the proton source, as well as using 14 GHz microwave heating, were first proposed in the world. The experimental platform was set up and preliminary commissioning was performed. The experimental results indicate that the source can produce a total of 4 mA CW hydrogen beams with microwave power of 200 W and extraction voltage of 40 kV, in which H²⁺ and H³⁺ are included. The successful commissioning of the proton source demonstrates that the proposed mechanism and the structure are feasible.

TUOMMH03

Status Report of SECRAL II Ion Source Development

94

L.T. Sun, M.Z. Guan, Q. Hu, W. Lu, L.Z. Ma, E.M. Mei, D.S. Ni, B.M. Wu, W. Wu, T.J. Yang, Y. Yang, W.H. Zhang, X.Z. Zhang, B. Zhao, H.W. Zhao, S.J. Zheng, L. Zhu
IMP, Lanzhou, People's Republic of China
Y. Yang
University of Chinese Academy of Sciences, Beijing, People's Republic of China

Funding: Work supported by the 100 Talents Program of the CAS (No. Y214160BR0), NSF (contract No. 11221064) and MOST (contract No. 2014CB845500).
For a new injector linac project launched at IMP, a superconducting ECR ion source SECRAL II is now under construction. This ion source is a duplicated one of SECRAL I which is operated routinely for HIRFL facility at the frequency of 18-24 GHz. SECRAL II is designed to be operated at the frequency of 28 GHz, which needs slightly higher radial field at the plasma chamber wall. The fabrication of the cold mass was started at early 2013, and it has been completed in May 2014. The engineering design of the whole superconducting magnet has also been finished and ready for fabrication. After a brief introduction of the recent results obtained with SECRAL I ion source, this paper will present the cold mass test results and the cryogenic system design of SECRAL II magnet. The test bench design will be also discussed.

Slides TUOMMH03 [3.782 MB]

WEOMMH02

First Commissioning Results of An Evaporative Cooling Magnet ECRIS-LECR4

107

W. Lu, Y.C. Feng, S.Q. Guo, B.H. Ma, H.Y. Ma, L.T. Sun, X.Z. Zhang, H.W. Zhao
IMP, Lanzhou, People's Republic of China
L. Ruan, B. Xiong
IEE, Beijing, People's Republic of China

LECR4 (Lanzhou ECR ion source No.4) is a room temperature ECR ion source, designed to produce high current, multiple charge state ions for SSC-linac project at IMP. The ion source has been optimized to be operated at 18 GHz. A unique feature of LECR4 is that all its solenoid coils are fully immersed in a special medium and cooled by evaporative cooling technology when excited. At design current, the coils can produce peak mirror fields on axis 2.3 Tesla at injection, 1.3 Tesla at extraction and 0.5 Tesla at minimum-B. The nominal radial magnetic field is 1.1 Tesla at plasma chamber wall, which is produced by a Halbach structure 36-segment hexapole. Recently, the project has made significant progress. In January 2014, the first plasma at 18 GHz was ignited. During the ongoing commissioning phase with a stainless steel chamber, tests with gaseous ion beams have been conducted. Some intense ion beams have been produced with microwave power less than 1.5 kW, such as 1.97 emA of O⁶⁺, 1.7 emA of Ar⁸⁺, 1.07 emA of Ar⁹⁺, 290 euA of Xe²⁰⁺ and so on. In this paper, the design of LECR4 ion source will be presented, and the latest test results will also be given.

Slides WEOMMH02 [3.543 MB]