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

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Franzen,  P.
Technology (TE), Max Planck Institute for Plasma Physics, Max Planck Society;

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Speth,  E.
Technology (TE), Max Planck Institute for Plasma Physics, Max Planck Society;

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Heinemann,  B.
Technology (TE), Max Planck Institute for Plasma Physics, Max Planck Society;

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Riedl,  R.
Technology (TE), Max Planck Institute for Plasma Physics, Max Planck Society;

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Citation

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.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0027-3EFE-7
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.