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Electron cyclotron resonance heating on TEXTOR

Author
Abstract

TEXTOR is equipped with two gyrotrons at 110 and 140 GHz, respectively. Both share a single power supply and a confocal quasi-optical transmission line. They cannot be operated simultaneously. The 110-GHz gyrotron with limited power and pulse length (300 kW; 200 ms) has been used in a first series of experiments on electron cyclotron resonance heating (ECRH) and electron cyclotron current drive (ECCD) and for collective Thomson scattering (CTS) diagnostics of energetic ions. In the future the 110-GHz gyrotron will be operated exclusively for CTS diagnostics, while for ECRH and ECCD, the newly installed 140-GHz, high-power (800-kW), long-pulse (>3-s) gyrotron is now available. The highlights of first ECRH experiments with the 110-GHz gyrotron are reported. These include observations of internal transport barriers with ECRH on various target plasmas: in the current plateau phase of both ohmic and radiation improved mode (RI-mode) discharges. In addition, sawtooth control by localized ECRH is demonstrated. First results on CTS include the observation of the slowing down of energetic ions and of the redistribution of energetic ions in sawtooth crashes.

Year of Publication
2005
Journal
Fusion Science and Technology
Volume
47
Number
2
Number of Pages
108-118
Date Published
Feb
Type of Article
Article
ISBN Number
1536-1055
Accession Number
ISI:000226876100007
URL
<Go to ISI>://000226876100007
PId
713f9114ab1bea17e0370bc0df9293c5
Alternate Journal
Fusion Sci. Technol.
Journal Article
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