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  A magnetic residual ion removal system with in-line ion dumps for the iter neutral beam injection system

Franzen, P., Sielanko, J., De Esch, H. P. L., Speth, E., Heinemann, B., & Riedl, R. (2003). A magnetic residual ion removal system with in-line ion dumps for the iter neutral beam injection system. Fusion Science and Technology, 44(4), 776-790.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0027-3EFE-7 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0027-3EFF-5
Genre: Journal Article

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 Creators:
Franzen, P.1, Author              
Sielanko, J.2, Author
De Esch, H. P. L.2, Author
Speth, E.1, Author              
Heinemann, B.1, Author              
Riedl, R.1, Author              
Affiliations:
1Technology (TE), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856318              
2Marie Curie Sklodowska Univ, PL-20031 Lublin, Poland; CEA, St Paul Les Durance, France, ou_persistent22              

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 Abstract: An alternative residual ion removal concept for the ITER neutral beam system is presented. It consists of magnetic deflection of the residual ions to in-line ion dumps. The target plates are hit from one side and form a 0.5-m-wide opening to the beam. First calculations show that for the most severe case of a 3-mrad beam, the maximum power load can be kept below 15 MW/m(2) using a different horizontal focal length. However, this different beamlet optic increases the beam peak power density changing the plasma deposition profile and increasing the shine-through power during low-density operation. First calculations showed that using a passive screening, the additional stray field created by the magnet could be kept below the required I gauss within the neutralizer. The overall beamline transmission increases by similar to10% (i.e., an additional 1.7-MW injected power for each beamline for a 3-mrad beam) due to the open structure of the magnet and the ion dumps. Furthermore, the concept offers a larger operating window regarding beam alignment, divergence, steering, and transmission, and it avoids creating accelerated secondary electrons.

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Language(s): eng - English
 Dates: 2003
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 112150
 Degree: -

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Title: Fusion Science and Technology
Source Genre: Journal
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Pages: - Volume / Issue: 44 (4) Sequence Number: - Start / End Page: 776 - 790 Identifier: ISSN: 1536-1055