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Return To: Session FT/P2 - Engineering Design
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(FT/P2-07) Development of Curved Drift Tubes for Improved Compact Toroid Injection Efficiency

N. Fukumoto1), Y. Inoo1), M. Nomura1), M. Nagata1), T. Uyama1), H. Ogawa2), H. Kimura2), U. Uehara2), T. Shibata2), Y. Kashiwa2), S. Suzuki2), S. Kasai2), JFT-2M Group2)
1) Himeji Institute of Technology, Himeji, Japan
2) Japan Atomic Energy Research Institute, Tokai-mura, Ibaraki, Japan

Abstract.  Compact toroid injection is a viable technology to fuel large tokamak reactors in the future. However, recent experiments indicate adverse effects of the toroidal magnetic field on CT injection. CT injection has so far been tested with horizontal injection which is subject to a force due to the gradient in the magnetic pressure along the path. Vertical injection eliminates the force and thus may be more advantageous. As preparatory experiments toward vertical injection, we have developed a curved rift tube to change the direction of CT propagation. It has been observed that a CT can be transported smoothly through curved drift tubes with 45 degrees and 90 degrees bends without appreciable change in the CT parameters. Magnetic field, electron density and speed of CTs transported through both 45 degrees and 90 degrees bends are similar to those observed in a linear drift tube.

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IAEA 2003