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JT-60 Upgrade vertical stability experiments and analysis

Technical Report:

Abstract

The JT-60 Upgrade tokamak (JT-60U), can produce plasmas with vertical elongation ({kappa} {approx_equal} 1.6), and thus allows investigation of vertical instability phenomena. The present work describes investigation of the vertical stability characteristics of JT-60U plasmas through experimental results and simulation. Experiments described include feedback turnoff cases and high {beta}{sub p} unstable plasma cases. For purposes of simulation, the plasma is modeled as a rigid assembly of current-carrying axisymmetric loops. A nominal conductor model based on design geometry was modified to reproduce the results of a series of coil excitation experiments using a reduced order system identification approach. A two-coil model was used to fit the experimental coil excitation behavior, and the full order conductor model was modified to allow the dominant modes to reflect the low order dynamic response. The resulting plasma-conductor model is shown to reproduce the vertical stability behavior of JT-60U fairly well. Theoretical predictions of limits on the value of Shafranov {Lambda} achievable in JT-60U are made. (author).
Authors:
Humphreys, D A; Yoshino, Ryuji [1] 
  1. Japan Atomic Energy Research Inst., Naka, Ibaraki (Japan). Naka Fusion Research Establishment
Publication Date:
May 01, 1992
Product Type:
Technical Report
Report Number:
JAERI-M-92-069
Reference Number:
SCA: 700412; PA: JPN-92:011052; SN: 93000918457
Resource Relation:
Other Information: PBD: May 1992
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; JT-60U TOKAMAK; MHD EQUILIBRIUM; PLASMA; FEEDBACK; CONTROL; MAGNETIC FIELDS; PLASMA PRODUCTION; REAL TIME SYSTEMS; POSITIONING; PLASMA MACROINSTABILITIES; PLASMA SIMULATION; 700412; MAGNETIC CONFINEMENT DEVICES
OSTI ID:
10111101
Research Organizations:
Japan Atomic Energy Research Inst., Tokyo (Japan)
Country of Origin:
Japan
Language:
English
Other Identifying Numbers:
Other: ON: DE93753131; TRN: JP9211052
Availability:
OSTI; NTIS; INIS
Submitting Site:
JPN
Size:
31 p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Humphreys, D A, and Yoshino, Ryuji. JT-60 Upgrade vertical stability experiments and analysis. Japan: N. p., 1992. Web.
Humphreys, D A, & Yoshino, Ryuji. JT-60 Upgrade vertical stability experiments and analysis. Japan.
Humphreys, D A, and Yoshino, Ryuji. 1992. "JT-60 Upgrade vertical stability experiments and analysis." Japan.
@misc{etde_10111101,
title = {JT-60 Upgrade vertical stability experiments and analysis}
author = {Humphreys, D A, and Yoshino, Ryuji}
abstractNote = {The JT-60 Upgrade tokamak (JT-60U), can produce plasmas with vertical elongation ({kappa} {approx_equal} 1.6), and thus allows investigation of vertical instability phenomena. The present work describes investigation of the vertical stability characteristics of JT-60U plasmas through experimental results and simulation. Experiments described include feedback turnoff cases and high {beta}{sub p} unstable plasma cases. For purposes of simulation, the plasma is modeled as a rigid assembly of current-carrying axisymmetric loops. A nominal conductor model based on design geometry was modified to reproduce the results of a series of coil excitation experiments using a reduced order system identification approach. A two-coil model was used to fit the experimental coil excitation behavior, and the full order conductor model was modified to allow the dominant modes to reflect the low order dynamic response. The resulting plasma-conductor model is shown to reproduce the vertical stability behavior of JT-60U fairly well. Theoretical predictions of limits on the value of Shafranov {Lambda} achievable in JT-60U are made. (author).}
place = {Japan}
year = {1992}
month = {May}
}