Recent results of control of current profile and instability using radiofrequency wave in JT‐60U and prediction analysis in JT‐60SA are descried. In JT‐60U, control of current profile in high‐beta regime was demonstrated by using a real‐time system, where the motional Stark effect diagnostic and lower hybrid wave were used as a detector and actuator, respectively. The minimum value of the safety factor was raised from 1.3 to 1.7 so as to follow the commanded value. Complete stabilization of a neoclassical tearing mode (NTM) with the poloidal mode number and the toroidal mode number was demonstrated using electron cyclotron (EC) current drive. By scanning the location of EC current drive in detail, strong stabilization effect was found for misalignment less than about half of the full island width. In addition, destabilization of the 2/1 NTM was observed for misalignment comparable to the full island width. Simulation of NTM stabilization in JT‐60SA was performed by using the TOPICS code combined with the modified Rutherford equation. The TOPICS simulation showed that complete stabilization can be achieved more effectively by optimizing the EC wave injection angle and modulating the EC wave.
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28 September 2007
RADIO FREQUENCY POWER IN PLASMAS: 17th Topical Conference on Radio Frequency Power in Plasmas
7–9 May 2007
Clearwater (Florida)
Research Article|
September 28 2007
Control of Current Profile and Instability by Radiofrequency Wave Injection in JT‐60U and Its Applicability in JT‐60SA
A. Isayama;
A. Isayama
aJapan Atomic Energy Agency, Naka, Ibaraki 311‐0193, Japan
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T. Suzuki;
T. Suzuki
aJapan Atomic Energy Agency, Naka, Ibaraki 311‐0193, Japan
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N. Hayashi;
N. Hayashi
aJapan Atomic Energy Agency, Naka, Ibaraki 311‐0193, Japan
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S. Ide;
S. Ide
aJapan Atomic Energy Agency, Naka, Ibaraki 311‐0193, Japan
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K. Hamamatsu;
K. Hamamatsu
aJapan Atomic Energy Agency, Naka, Ibaraki 311‐0193, Japan
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T. Fujita;
T. Fujita
aJapan Atomic Energy Agency, Naka, Ibaraki 311‐0193, Japan
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H. Hosoyama;
H. Hosoyama
aJapan Atomic Energy Agency, Naka, Ibaraki 311‐0193, Japan
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Y. Kamada;
Y. Kamada
aJapan Atomic Energy Agency, Naka, Ibaraki 311‐0193, Japan
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K. Nagasaki;
K. Nagasaki
bInstitute of Advanced Energy, Kyoto University, Uji, Kyoto 611‐0011, Japan
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N. Oyama;
N. Oyama
aJapan Atomic Energy Agency, Naka, Ibaraki 311‐0193, Japan
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T. Ozeki;
T. Ozeki
aJapan Atomic Energy Agency, Naka, Ibaraki 311‐0193, Japan
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S. Sakata;
S. Sakata
aJapan Atomic Energy Agency, Naka, Ibaraki 311‐0193, Japan
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M. Seki;
M. Seki
aJapan Atomic Energy Agency, Naka, Ibaraki 311‐0193, Japan
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M. Sueoka;
M. Sueoka
aJapan Atomic Energy Agency, Naka, Ibaraki 311‐0193, Japan
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M. Takechi;
M. Takechi
aJapan Atomic Energy Agency, Naka, Ibaraki 311‐0193, Japan
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H. Urano;
H. Urano
aJapan Atomic Energy Agency, Naka, Ibaraki 311‐0193, Japan
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AIP Conf. Proc. 933, 229–236 (2007)
Citation
A. Isayama, T. Suzuki, N. Hayashi, S. Ide, K. Hamamatsu, T. Fujita, H. Hosoyama, Y. Kamada, K. Nagasaki, N. Oyama, T. Ozeki, S. Sakata, M. Seki, M. Sueoka, M. Takechi, H. Urano, the JT‐60 team; Control of Current Profile and Instability by Radiofrequency Wave Injection in JT‐60U and Its Applicability in JT‐60SA. AIP Conf. Proc. 28 September 2007; 933 (1): 229–236. https://doi.org/10.1063/1.2800482
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