Abstract
In the JT-60U tokamak, the ECE measurements have been made by means of a twenty-channel grating polychromator diagnostic system (GPS) in which a newly developed detector system by the use of low-noise preamplifiers was installed. Operational performance of the GPS with respect to resolutions and noise level is described. The ECE measurements coupled with equilibrium analysis to calculate a local magnetic field strength show good internal-consistency between the equilibrium configuration and the sawtooth inversion locations. Based on the result, the dependence of the normalized inversion radius on the inverse safety factor and the observation of m = 1 mode oscillations are presented. A preliminary result from ECE reconstruction applied to a precursor oscillation represents the formation of a clear crescent m = 1 island, a hot spot and a narrow cold region. (author).
Ishida, Shinichi;
Isei, Nobuaki;
Sato, Masayasu
[1]
- Japan Atomic Energy Research Inst., Naka, Ibaraki (Japan). Naka Fusion Research Establishment
Citation Formats
Ishida, Shinichi, Isei, Nobuaki, and Sato, Masayasu.
Operation of a 20-channel grating polychromator diagnostic system and its application to sawtooth observations in JT-60U.
Japan: N. p.,
1992.
Web.
Ishida, Shinichi, Isei, Nobuaki, & Sato, Masayasu.
Operation of a 20-channel grating polychromator diagnostic system and its application to sawtooth observations in JT-60U.
Japan.
Ishida, Shinichi, Isei, Nobuaki, and Sato, Masayasu.
1992.
"Operation of a 20-channel grating polychromator diagnostic system and its application to sawtooth observations in JT-60U."
Japan.
@misc{etde_10123153,
title = {Operation of a 20-channel grating polychromator diagnostic system and its application to sawtooth observations in JT-60U}
author = {Ishida, Shinichi, Isei, Nobuaki, and Sato, Masayasu}
abstractNote = {In the JT-60U tokamak, the ECE measurements have been made by means of a twenty-channel grating polychromator diagnostic system (GPS) in which a newly developed detector system by the use of low-noise preamplifiers was installed. Operational performance of the GPS with respect to resolutions and noise level is described. The ECE measurements coupled with equilibrium analysis to calculate a local magnetic field strength show good internal-consistency between the equilibrium configuration and the sawtooth inversion locations. Based on the result, the dependence of the normalized inversion radius on the inverse safety factor and the observation of m = 1 mode oscillations are presented. A preliminary result from ECE reconstruction applied to a precursor oscillation represents the formation of a clear crescent m = 1 island, a hot spot and a narrow cold region. (author).}
place = {Japan}
year = {1992}
month = {Aug}
}
title = {Operation of a 20-channel grating polychromator diagnostic system and its application to sawtooth observations in JT-60U}
author = {Ishida, Shinichi, Isei, Nobuaki, and Sato, Masayasu}
abstractNote = {In the JT-60U tokamak, the ECE measurements have been made by means of a twenty-channel grating polychromator diagnostic system (GPS) in which a newly developed detector system by the use of low-noise preamplifiers was installed. Operational performance of the GPS with respect to resolutions and noise level is described. The ECE measurements coupled with equilibrium analysis to calculate a local magnetic field strength show good internal-consistency between the equilibrium configuration and the sawtooth inversion locations. Based on the result, the dependence of the normalized inversion radius on the inverse safety factor and the observation of m = 1 mode oscillations are presented. A preliminary result from ECE reconstruction applied to a precursor oscillation represents the formation of a clear crescent m = 1 island, a hot spot and a narrow cold region. (author).}
place = {Japan}
year = {1992}
month = {Aug}
}