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Title: Development of a rf negative-ion source for ITER neutral beam injection

Abstract

The development at IPP of a large-area rf source for negative hydrogen ions, an official EFDA task agreement, aims to demonstrate ITER-relevant source parameters. This implies a current density of 20 mA cm{sup -2} accelerated D{sup -} at a source-filling pressure of <0.3 Pa, an electron to ion ratio of <1, and for pulse lengths of up to 1 h. The principle suitability concerning current density, pressure, and electron content has been demonstrated with the test facility Bavarian Test Machine for Negative Ions but with only small extraction area (70 cm{sup 2}) and for pulse length of <6 s. The further development concentrates now on long pulse operation at the test stand Multi-Ampere Negative Ion Test Unit (MANITU), which became operational this spring. For source size extension from 70 to 1000 cm{sup 2} MANITU and a third test facility, currently under development, called RADI will be used. This article will report on the latest results of the work in progress. A critical issue for ITER is reliable source operation at high current densities. Therefore the procedure used to obtain in a reproducible manner source operation at the ITER target values will be detailed and discussed.

Authors:
; ; ; ; ; ; ; ; ;  [1]
  1. Max-Planck-Institut fuer Plasmaphysik, EURATOM Association, Postfach 1533, D-85740 Garching (Germany)
Publication Date:
OSTI Identifier:
20779004
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 77; Journal Issue: 3; Conference: 11. international conference on ion sources, Caen (France), 12-16 Sep 2005; Other Information: DOI: 10.1063/1.2166246; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ANIONS; CURRENT DENSITY; DEUTERIUM IONS; ELECTRONS; HYDROGEN IONS; ION SOURCES; ITER TOKAMAK; OPERATION; PLASMA BEAM INJECTION; PULSES; TEST FACILITIES

Citation Formats

McNeely, P., Falter, H.-D., Fantz, U., Franzen, P., Froeschle, M., Heinemann, B., Kraus, W., Martens, Ch., Riedl, R., and Speth, E. Development of a rf negative-ion source for ITER neutral beam injection. United States: N. p., 2006. Web. doi:10.1063/1.2166246.
McNeely, P., Falter, H.-D., Fantz, U., Franzen, P., Froeschle, M., Heinemann, B., Kraus, W., Martens, Ch., Riedl, R., & Speth, E. Development of a rf negative-ion source for ITER neutral beam injection. United States. doi:10.1063/1.2166246.
McNeely, P., Falter, H.-D., Fantz, U., Franzen, P., Froeschle, M., Heinemann, B., Kraus, W., Martens, Ch., Riedl, R., and Speth, E. Wed . "Development of a rf negative-ion source for ITER neutral beam injection". United States. doi:10.1063/1.2166246.
@article{osti_20779004,
title = {Development of a rf negative-ion source for ITER neutral beam injection},
author = {McNeely, P. and Falter, H.-D. and Fantz, U. and Franzen, P. and Froeschle, M. and Heinemann, B. and Kraus, W. and Martens, Ch. and Riedl, R. and Speth, E.},
abstractNote = {The development at IPP of a large-area rf source for negative hydrogen ions, an official EFDA task agreement, aims to demonstrate ITER-relevant source parameters. This implies a current density of 20 mA cm{sup -2} accelerated D{sup -} at a source-filling pressure of <0.3 Pa, an electron to ion ratio of <1, and for pulse lengths of up to 1 h. The principle suitability concerning current density, pressure, and electron content has been demonstrated with the test facility Bavarian Test Machine for Negative Ions but with only small extraction area (70 cm{sup 2}) and for pulse length of <6 s. The further development concentrates now on long pulse operation at the test stand Multi-Ampere Negative Ion Test Unit (MANITU), which became operational this spring. For source size extension from 70 to 1000 cm{sup 2} MANITU and a third test facility, currently under development, called RADI will be used. This article will report on the latest results of the work in progress. A critical issue for ITER is reliable source operation at high current densities. Therefore the procedure used to obtain in a reproducible manner source operation at the ITER target values will be detailed and discussed.},
doi = {10.1063/1.2166246},
journal = {Review of Scientific Instruments},
number = 3,
volume = 77,
place = {United States},
year = {Wed Mar 15 00:00:00 EST 2006},
month = {Wed Mar 15 00:00:00 EST 2006}
}