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Title: Development of steady-state operation using ion cyclotron heating in the Large Helical Device

Using a handshake shape (HAS) antenna phasing dipole for ion cyclotron heating (ICH), the heating efficiency was higher than that using a previous poloidal array antenna in the Large Helical Device. In order to sustain the dipole operation, real-time feedback for impedance matching and maintaining the same phase and power was adopted during long-pulse discharge. The HAS antenna was designed to reduce parasitic losses associated with energetic particle and radio-frequency (RF) sheath effects by field-aligned current concentration on the midplane. Local hot spots and the inhomogeneity of the diverter heat profile in the toroidal direction were reduced. The long-pulse discharge with an electron density (n{sub e0}) of 1 × 10{sup 19} m{sup −3}, center electron temperature (T{sub e0}) of 2.5 keV, a plasma duration time (t{sub d}) of 19 min, and RF heating power (P{sub RF}) of 1 MW was achieved by ICH and electron cyclotron heating.
Authors:
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  1. National Institute for Fusion Science, Toki (Japan)
Publication Date:
OSTI Identifier:
22299948
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 21; Journal Issue: 6; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; CONCENTRATION RATIO; DIPOLES; ECR HEATING; ELECTRON DENSITY; ELECTRON TEMPERATURE; FEEDBACK; HOT SPOTS; IMPEDANCE; KEV RANGE 01-10; LHD DEVICE; PLASMA; PULSES; RADIOWAVE RADIATION; STEADY-STATE CONDITIONS