Plasma and Fusion Research

Volume 3, 010 (2008)

Rapid Communications

Visualization of Magnetic Surfaces during Current Ramp-Up Phase Using Thermal Lithium Sheet Beam in CPD
Tetsushi KIKUKAWA, Hideki ZUSHI1), Tomohiro MORISAKI2), Rajendraprasad BHATTACHARYAY, Tomofumi RYOUKAI, Tomokazu YOSHINAGA1), Makoto HASEGAWA1), Kazuaki HANADA1), Hiroshi IDEI1) and CPD Experimental Group1)
Interdisciplinary Graduate School of Engineering Science, Kyushu University, Kasuga, Fukuoka 816-8580, Japan
1)
Research Institute for Applied Mechanics, Kyushu University, Kasuga, Fukuoka 816-8580, Japan
2)
National Institute for Fusion Science, Toki, Gifu, 509-8292, Japan
(Received 11 January 2008 / Accepted 21 January 2008 / Published 21 February 2008)

Abstract

Two dimensional electron density profile measurement has been performed in the spherical tokamak CPD (Compact PWI experimental Device) using Li sheet beam imaging technique. The topological change from the open magnetic field line configuration to the closed one is visualized by this technique. The plasma current can be driven by RF waves itself in a weak mirror configuration and a clear change is observed in plasma boundary as well as magnetic field topology associated with the transition of the current from low (∼1 kA) to high (∼3 kA) value.

Keywords

Li beam, electron density profile, ECRH, EBW, current drive, magnetic flux surface

DOI: 10.1585/pfr.3.010

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References

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  • [2] T. Maekawa et al., Nucl. Fusion 45, 1439 (2005).
  • [3] H. Zushi et al., J. Nucl. Mater. 363, 1429 (2007).
  • [4] R. Bhattacharyay et al., Plasma Fusion Res. 2, S1103 (2007).
  • [5] R. Bhattacharyay et al., accepted for publication in Phys. Plasmas (2008).

This paper may be cited as follows:

Tetsushi KIKUKAWA, Hideki ZUSHI, Tomohiro MORISAKI, Rajendraprasad BHATTACHARYAY, Tomofumi RYOUKAI, Tomokazu YOSHINAGA, Makoto HASEGAWA, Kazuaki HANADA, Hiroshi IDEI and CPD Experimental Group, Plasma Fusion Res. 3, 010 (2008).