Thumbnail
Access Restriction
Subscribed

Author Fujii, T. ♦ Kasugai, A.
Source IEEE Xplore Digital Library
Content type Text
Publisher Institute of Electrical and Electronics Engineers, Inc. (IEEE)
File Format PDF
Copyright Year ©2003
Language English
Subject Domain (in DDC) Technology ♦ Engineering & allied operations
Subject Keyword Heating ♦ Mouth ♦ Radio frequency ♦ Gyrotrons ♦ Real time systems ♦ Plasmas ♦ Silicon carbide ♦ Control systems ♦ Antenna measurements ♦ Mirrors
Abstract RF systems of ECH, LH, ICH, and positive and negative ion based NBI systems are equipped in JT-60U to realize highly integrated performance plasma. Their performance and development are presented. The ECH system with the total output of 4 MW at 110 GHz has been developed using four 1 MW gyrotrons. The gyrotron has achieved 1 MW, 5 sec output of the designed value by suppressing the parasitic oscillation with SiC RF absorber built-in. Moreover, 13 MW, 1.5 s output has been attained up to now. A real time system has been developed to stabilize neoclassical tearing mode (NTM) by controlling EC beams, which consists of the ECE measurement system, JT-60 real time processor and ECH system with steerable mirror antennas. This system successfully works to suppress NTMs. The LH launcher mouth was improved for longer pulse operation 30-60 s. The grill mouth made of carbon materials was joined onto the original mouth. Injection performance of the negative-ion based NBI system has been improved by correcting beamlet deflection due to beamlet-beamlet repulsion by space charge effect. This was compensated by a focusing electric field that was made by modification of extractor segment edges. Then, injection of 2.6 MW, 10 s has been achieved reducing temperature rise of the beam limiter by /spl sim/70%.
Description Author affiliation: Naka Fusion Res. Establ., Japan Atomic Energy Res. Inst., Ibaraki, Japan (Fujii, T.; Kasugai, A.)
ISBN 078037908X
Educational Role Student ♦ Teacher
Age Range above 22 year
Educational Use Research ♦ Reading
Education Level UG and PG
Learning Resource Type Article
Publisher Date 2003-10-14
Publisher Place USA
Rights Holder Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Size (in Bytes) 1.13 MB
Page Count 6
Starting Page 222
Ending Page 227


Source: IEEE Xplore Digital Library