Improvement of Field Accuracy and Plasma Performance in the RT-1 Device

• YANO Yoshihisa

  Department of Advanced Energy, University of Tokyo, Kashiwa, Chiba 277-8561, Japan

• YOSHIDA Zensho

  Department of Advanced Energy, University of Tokyo, Kashiwa, Chiba 277-8561, Japan

• MORIKAWA Junji

  Department of Advanced Energy, University of Tokyo, Kashiwa, Chiba 277-8561, Japan

• SAITOH Haruhiko

  Department of Advanced Energy, University of Tokyo, Kashiwa, Chiba 277-8561, Japan

• HAYASHI Hiroyuki

  Department of Advanced Energy, University of Tokyo, Kashiwa, Chiba 277-8561, Japan

• MIZUSHIMA Tatsunori

  Department of Advanced Energy, University of Tokyo, Kashiwa, Chiba 277-8561, Japan

Abstract

To improve the accuracy of the magnetic field of Ring Trap-1 (RT-1), we have constructed a system of correction coils to cancel the geomagnetic field and control the attitude of the floating magnet. Without the geomagnetic field canccellation, the floating magnet tilts about 1.4 degrees. The previous prototype correction coils have been replaced by new coils that are much larger and farther from the chamber, so the error field due to the multipole components of the correction field is reduced by a factor of 30 (from 2.6% to 0.1% of the confinement field near the edge region). A significant improvement in plasma confinement has been observed (the stored energy of the plasma has been increased by a factor of 1.5).

Journal

• Plasma and Fusion Research

  Plasma and Fusion Research 4 039-039, 2009

  The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

• levitated dipole confinement
• field accuracy
• geomagnetic
• correction coils
• high-beta plasma

Details

• CRID: 1390282680230980736
• NII Article ID: 130000138101
• DOI: 10.1585/pfr.4.039
• ISSN: 18806821
• Web Site: http://www.jstage.jst.go.jp/article/pfr/4/0/4_0_039/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed