Sustained Detachment with the Self-Regulated Plasma Edge beneath the Last Closed Flux Surface in LHD

Search this Article

Author(s)

Abstract

Self-sustained detachment has been obtained in the Large Helical Devise (LHD). Strong hydrogen gas puffing of ~200 Pa・m^3/s after a density feedback phase successfully detaches the plasma from the divertor plate with high reproducibility. High electron density of over 1×10^<20>m^<-3> is sustained without gas puffing until the heating beam stops and the high-density flat top for 2 seconds has been demonstrated. Throughout the detachment phase, the minor radius of the hot plasma column shrinks to ~90 % of the last closed flux surface, which corresponds to the ι/2π=1/q=1 rational surface.

Self-sustained detachment has been obtained in the Large Helical Devise (LHD). Strong hydrogen gas puffing of ˜200 P•am<sup>3</sup>/s after a density feedback phase successfully detaches the plasma from the divertor plate with high reproducibility. High electron density of over 1 × 10<sup>20</sup> m<sup>-3</sup> is sustained without gas puffing until the heating beam stops and the high-density flat top for 2 seconds has been demonstrated. Throughout the detachment phase, the minor radius of the hot plasma column shrinks to ˜90 % of the last closed flux surface, which corresponds to the ι/2π = 1/q = 1 rational surface.

Journal

  • Journal of Plasma and Fusion Research

    Journal of Plasma and Fusion Research 81(5), 331-332, 2005-05-25

    The Japan Society of Plasma Science and Nuclear Fusion Research

References:  4

  • <no title>

    ITER Physics Expert Group on Divertor

    Nucl. Fusion 39, 2391, 1999

    Cited by (1)

  • <no title>

    PETERSON B. J.

    Plasma Phys. Control. Fusion 45, 1167, 2003

    Cited by (1)

  • <no title>

    GRIGULL P.

    J. Nucl. Mater. 313-316, 1287, 2003

    DOI  Cited by (1)

  • <no title>

    MASUZAKI S.

    J. Nucl. Mater. 313-316, 852, 2003

    DOI  Cited by (2)

Codes

  • NII Article ID (NAID)
    110006282103
  • NII NACSIS-CAT ID (NCID)
    AN10401672
  • Text Lang
    ENG
  • Article Type
    SHO
  • ISSN
    09187928
  • Data Source
    CJP  NII-ELS  J-STAGE  NDL-Digital 
Page Top