[Table of Contents]

Plasma and Fusion Research

Volume 2, S1049 (2007)

Regular Articles

Development of Real-Time Measurement System of Charge Exchange Recombination Spectroscopy and Its Application to Feedback Control of Ion Temperature Gradient in JT-60U
Shinji KOBAYASHI, Maiko YOSHIDA1), Hidenobu TAKENAGA1), Shinya SAKATA1), Yutaka KAMADA1), Yoshiteru SAKAMOTO1), Yoshihiko KOIDE1) and the JT-60 Team
Institute of Advanced Energy, Kyoto University, Gokasho, Uji 611-0011, Japan
1)
Japan Atomic Energy Agency, Naka 311-0193, Japan
(Received 4 December 2006 / Accepted 27 June 2007 / Published 20 November 2007)

Abstract

Real-time measurement system of the ion temperature profile has been developed for the feedback (FB) control of the ion temperature gradient (grad-Ti) with the filter charge exchange recombination spectroscopy (CXRS) system in JT-60U. The rapid analytical scheme without non-linear least square fitting enables us to calculate the ion temperature with four spatial points every 10 ms using a real-time processor system. The FB control experiment of grad-Ti has been demonstrated in ELMy H-mode plasmas by use of the neutral beam injectors having different deposition profiles as actuators. Grad-Ti was controlled to the reference value in the ramp-down phase, however, it did not recovered in the ramp-up phase because the internal transport barrier or transport was affected by the ramp-down of grad-Ti, From the transient response analysis of grad-Ti, the increase in the central Ti using the additional heating was required to recover the deteriorated grad-Ti.

Keywords

filter charge exchange recombination spectroscopy, real-time measurement, feedback control of temperature gradient

DOI: 10.1585/pfr.2.S1049

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This paper may be cited as follows:

Shinji KOBAYASHI, Maiko YOSHIDA, Hidenobu TAKENAGA, Shinya SAKATA, Yutaka KAMADA, Yoshiteru SAKAMOTO, Yoshihiko KOIDE and the JT-60 Team, Plasma Fusion Res. 2, S1049 (2007).