ECRIS2010 - List of Authors (Marie-Jeanne, M.)

Paper

Title

Page

Measurement of the Sixty GHz ECR Ion Source using Megawatt Magnets - SEISM Magnetic Field Map

33

M. Marie-Jeanne, J. Jacob, T. Lamy, L. Latrasse
LPSC, Grenoble Cedex, France
F. Debray, J. Matera, R. Pfister, C. Trophime
GHMFL, Grenoble, France

LPSC has developed a prototype of 60GHz Electron Cyclotron Resonance (ECR) Ion Source called SEISM. The first 60GHz magnetic structure is based on a cusp geometry, using resistive polyhelix coils designed in collaboration with the Intense Magnetic Fields National Laboratory (LNCMI). A dedicated test bench helices coils in their tanks, electrical, and water cooling environment was built to study the mechanics, thermal behaviour and magnetic field characteristics obtained at various current levels. During the last months, measurements were performed for several magnetic configurations, with up to 7000A applied on the injection/extraction coils set. The magnetic field achieved at 13000A is expected to allow 28GHz ECR condition. However, cavitation issues that appeared around 7000A are to be solved before carrying on with the tests. This contribution will recall some of the crucial steps in the prototype fabrication, and show preliminary results from the measurements at 7000A. Possible explanations for the discrepancies observed between the results and the simulation will be given.

Slides MOCOCK04 [3.243 MB]

WECOBK03

Fine Frequency Tuning of the PHOENIX Charge Breeder Used as a Probe for ECRIS Plasmas

184

T. Lamy, J. Angot, M. Marie-Jeanne, J. Médard, P. Sortais, T. Thuillier
LPSC, Grenoble Cedex, France
A. Galatà
INFN/LNL, Legnaro (PD), Italy
H. A. Koivisto, O.A. Tarvainen
JYFL, Jyväskylä, Finland

Fine frequency tuning of ECR ion sources is a main issue to optimize the production of multiply charged ion beams. The PHOENIX charge breeder operation has been tested in the range 13,75 - 14,5 GHz with an HF power of about 400 W. The effect of this tuning is analyzed by measuring the multi-ionization efficiency obtained for various characterized injected 1+ ion beams (produced by the 2.45 GHz COMIC source). The 1+/n+ method includes the capture and the multi ionization processes of the 1+ beam and may be considered as a plasma probe. The n+ spectra obtained could be considered, in first approach, as an image of the plasma of the charge breeder. However, in certain conditions it has been observed that the injection of a few hundreds of nA of 1+ ions (i.e.: Xe¹⁺) in the plasma of the charge breeder, is able to destroy the charge state distribution of the support gas (i.e.: up to 40 % of O⁶⁺ and O⁷⁺ disappears). The study of this phenomenon will be presented along with plasma potential measurements for various charge states. This study may help to understand the ECRIS creation (or destruction) of highly charged ions.

Slides WECOBK03 [7.745 MB]

Paper	Title	Page
MOCOCK04	Measurement of the Sixty GHz ECR Ion Source using Megawatt Magnets - SEISM Magnetic Field Map	33
	M. Marie-Jeanne, J. Jacob, T. Lamy, L. Latrasse LPSC, Grenoble Cedex, France F. Debray, J. Matera, R. Pfister, C. Trophime GHMFL, Grenoble, France
	LPSC has developed a prototype of 60GHz Electron Cyclotron Resonance (ECR) Ion Source called SEISM. The first 60GHz magnetic structure is based on a cusp geometry, using resistive polyhelix coils designed in collaboration with the Intense Magnetic Fields National Laboratory (LNCMI). A dedicated test bench helices coils in their tanks, electrical, and water cooling environment was built to study the mechanics, thermal behaviour and magnetic field characteristics obtained at various current levels. During the last months, measurements were performed for several magnetic configurations, with up to 7000A applied on the injection/extraction coils set. The magnetic field achieved at 13000A is expected to allow 28GHz ECR condition. However, cavitation issues that appeared around 7000A are to be solved before carrying on with the tests. This contribution will recall some of the crucial steps in the prototype fabrication, and show preliminary results from the measurements at 7000A. Possible explanations for the discrepancies observed between the results and the simulation will be given.
	Slides MOCOCK04 [3.243 MB]

WECOBK03	Fine Frequency Tuning of the PHOENIX Charge Breeder Used as a Probe for ECRIS Plasmas	184
	T. Lamy, J. Angot, M. Marie-Jeanne, J. Médard, P. Sortais, T. Thuillier LPSC, Grenoble Cedex, France A. Galatà INFN/LNL, Legnaro (PD), Italy H. A. Koivisto, O.A. Tarvainen JYFL, Jyväskylä, Finland
	Fine frequency tuning of ECR ion sources is a main issue to optimize the production of multiply charged ion beams. The PHOENIX charge breeder operation has been tested in the range 13,75 - 14,5 GHz with an HF power of about 400 W. The effect of this tuning is analyzed by measuring the multi-ionization efficiency obtained for various characterized injected 1+ ion beams (produced by the 2.45 GHz COMIC source). The 1+/n+ method includes the capture and the multi ionization processes of the 1+ beam and may be considered as a plasma probe. The n+ spectra obtained could be considered, in first approach, as an image of the plasma of the charge breeder. However, in certain conditions it has been observed that the injection of a few hundreds of nA of 1+ ions (i.e.: Xe¹⁺) in the plasma of the charge breeder, is able to destroy the charge state distribution of the support gas (i.e.: up to 40 % of O⁶⁺ and O⁷⁺ disappears). The study of this phenomenon will be presented along with plasma potential measurements for various charge states. This study may help to understand the ECRIS creation (or destruction) of highly charged ions.
	Slides WECOBK03 [7.745 MB]