ECRIS-2014 - Table of Session: WEOMMH (W1)

Paper

Title

Page

The Installation of the 28GHz Superconducting ECR Ion Source At KBSI

104

M. Won, S. Choi, J.G. Hong, S.J. Kim, B.S. Lee, J.W. Ok, J.Y. Park, C.S. Shin, J.H. Yoon
Korea Basic Science Institute, Busan, Republic of Korea
J.B. Bhang
Kyungpook National University, Daegu, Republic of Korea

In 2009, a 28 GHz superconducting electron cyclotron resonance (ECR) ion source was developed to produce high currents, diverse heavy ion charge state for the compact heavy ion linear accelerator at KBSI (Korea Basic Science Institute). The aim of this study was to generate a high current, and fast neutrons for interacting a heavy ion with the proton target. The fabrication of the key parts, which are the superconducting magnet system with the liquid helium re-condensed cryostat, the 10 kW high-power microwave considering for optimum operation at the 28 GHz ECR Ion Source, were completed in 2013. The waveguide components were connected with a plasma chamber including a gas supply system. The plasma chamber and ion beam extraction were inserted into the warm bore of superconducting magnet. In this paper, we present the current status of the installation of an ECR ion source and report on the test results for ECR plasma ignition.

Slides WEOMMH01 [5.460 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]

WEOMMH03

Development of the Magnetic System for New DECRIS-PM Ion Source

111

A.A. Efremov, V. Bekhterev, S.L. Bogomolov
JINR, Dubna, Moscow Region, Russia
N.N. Konev
ITT-Group, Moscow, Russia

Super-heavy-element factory is under development at the Flerov Laboratory for Nuclear Reactions, JINR, Dubna. The factory will include DC-280 cyclotron, which will be equipped with two 100 kV high voltage platforms. All-permanent magnet ECRIS will be installed on one of the platforms. The request for the source is a production of medium mass ions with A/q=4-7.5 such as 48Ca⁸⁺. Results of the detailed design of a magnetic structure for DECRIS-PM will be presented.

Slides WEOMMH03 [1.165 MB]

WEOMMH04

Thermal Design of Refridgerated Hexapole 18 GHz ECRIS HIISI

114

T. Kalvas, H. A. Koivisto, K. Ranttila, O.A. Tarvainen
JYFL, Jyväskylä, Finland

A project is underway for constructing a new 18 GHz ECR ion source HIISI at University of Jyväskylä. An innovative plasma chamber structure with grooves at magnetic poles is being studied. This allows large chamber radius at the poles, which is relevant for the performance of the ion source while smaller radius between the poles makes space for chamber water cooling. The hexapole will be refridgerated to sub-zero temperatures to boost the coercivity and the remanence of the permanent magnet material. The hexapole structure is insulated from high temperature solenoid coils and plasma chamber by vacuum. The thermal design of the structure has been made using a thermal diffusion code taking in account radiative, conductive and convective heat transfer processes. The heat flux from plasma has been estimated using electron trajectory simulations with sensitivity analysis on the electron energy distribution. The electron simulations are verified by comparing to experimental data from 14 GHz ECR. The electron and thermodynamic simulation efforts are presented together with an analysis of the H-field vs. coersivity in the permanent magnets.

Slides WEOMMH04 [5.163 MB]

Paper	Title	Page
WEOMMH01	The Installation of the 28GHz Superconducting ECR Ion Source At KBSI	104
	M. Won, S. Choi, J.G. Hong, S.J. Kim, B.S. Lee, J.W. Ok, J.Y. Park, C.S. Shin, J.H. Yoon Korea Basic Science Institute, Busan, Republic of Korea J.B. Bhang Kyungpook National University, Daegu, Republic of Korea
	In 2009, a 28 GHz superconducting electron cyclotron resonance (ECR) ion source was developed to produce high currents, diverse heavy ion charge state for the compact heavy ion linear accelerator at KBSI (Korea Basic Science Institute). The aim of this study was to generate a high current, and fast neutrons for interacting a heavy ion with the proton target. The fabrication of the key parts, which are the superconducting magnet system with the liquid helium re-condensed cryostat, the 10 kW high-power microwave considering for optimum operation at the 28 GHz ECR Ion Source, were completed in 2013. The waveguide components were connected with a plasma chamber including a gas supply system. The plasma chamber and ion beam extraction were inserted into the warm bore of superconducting magnet. In this paper, we present the current status of the installation of an ECR ion source and report on the test results for ECR plasma ignition.
	Slides WEOMMH01 [5.460 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]

WEOMMH03	Development of the Magnetic System for New DECRIS-PM Ion Source	111
	A.A. Efremov, V. Bekhterev, S.L. Bogomolov JINR, Dubna, Moscow Region, Russia N.N. Konev ITT-Group, Moscow, Russia
	Super-heavy-element factory is under development at the Flerov Laboratory for Nuclear Reactions, JINR, Dubna. The factory will include DC-280 cyclotron, which will be equipped with two 100 kV high voltage platforms. All-permanent magnet ECRIS will be installed on one of the platforms. The request for the source is a production of medium mass ions with A/q=4-7.5 such as 48Ca⁸⁺. Results of the detailed design of a magnetic structure for DECRIS-PM will be presented.
	Slides WEOMMH03 [1.165 MB]

WEOMMH04	Thermal Design of Refridgerated Hexapole 18 GHz ECRIS HIISI	114
	T. Kalvas, H. A. Koivisto, K. Ranttila, O.A. Tarvainen JYFL, Jyväskylä, Finland
	A project is underway for constructing a new 18 GHz ECR ion source HIISI at University of Jyväskylä. An innovative plasma chamber structure with grooves at magnetic poles is being studied. This allows large chamber radius at the poles, which is relevant for the performance of the ion source while smaller radius between the poles makes space for chamber water cooling. The hexapole will be refridgerated to sub-zero temperatures to boost the coercivity and the remanence of the permanent magnet material. The hexapole structure is insulated from high temperature solenoid coils and plasma chamber by vacuum. The thermal design of the structure has been made using a thermal diffusion code taking in account radiative, conductive and convective heat transfer processes. The heat flux from plasma has been estimated using electron trajectory simulations with sensitivity analysis on the electron energy distribution. The electron simulations are verified by comparing to experimental data from 14 GHz ECR. The electron and thermodynamic simulation efforts are presented together with an analysis of the H-field vs. coersivity in the permanent magnets.
	Slides WEOMMH04 [5.163 MB]