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  Development of large radio frequency negative-ion sources for nuclear fusion

Kraus, W., McNeely, P., Speth, E., Heinemann, B., Vollmer, O., & Wilhelm, R. (2002). Development of large radio frequency negative-ion sources for nuclear fusion. Review of Scientific Instruments, 73, 1096-1098.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0027-420D-2 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0027-420E-F
Genre: Journal Article

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 Creators:
Kraus, W.1, Author              
McNeely, P.1, 2, 3, Author              
Speth, E.1, Author              
Heinemann, B.1, Author              
Vollmer, O.4, Author              
Wilhelm, R.1, Author              
Affiliations:
1Technology (TE), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856318              
2W7-X: Heating (HT), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856343              
3W7-X: Heating and CoDaC (HC), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856306              
4External Organizations, ou_persistent22              

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 Abstract: The development of a large-area radio frequency (rf) source for the negative-ion beam production has been continued using a prototype source of 37 1 with a rf power up to 160 kW at 0.93 MHz. The design is based on a small rf driven cylindrical driver source on a large magnetically confined expansion volume (60 x 31 x 20 cm(3)) and is in principle scalable to any size. Although the H- yields reported earlier have not been exceeded, progress has been made in several areas. To protect the ceramic insulator of the driver from thermal stress an internal copper Faraday screen has been added. This has resulted in reliable long pulse operation with a duration up to 15 s. Various different grid materials have been investigated as potential options for cesium-free operation. No clear-cut conclusion can yet be drawn from those experiments due to unexpected copper sputtering from the Faraday shield onto the plasma grid. The dependence of the H- yield on gas pressure and filter strength have been studied. The effect of noble gases addition to the discharge has been investigated using a Langmuir probe. These measurements indicate that the enhancement of H- current may be caused by a change in plasma density brought about by the addition of a noble gas. (C) 2002 American Institute of Physics.

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Language(s): eng - English
 Dates: 2002
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 20701
ISI: 000173921000182
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Title: Review of Scientific Instruments
  Alternative Title : Rev. Sci. Instrum.
Source Genre: Journal
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Pages: - Volume / Issue: 73 Sequence Number: - Start / End Page: 1096 - 1098 Identifier: ISSN: 0034-6748