Steady-State Operation Scenarios with a Central Current Hole for JT-60SC
- Japan Atomic Energy Research Institute (Japan)
A 1.5-dimensional time-dependent transport analysis has been carried out to investigate steady-state operation scenarios with a central current hole by off-axis current drive schemes consistent with a high bootstrap current fraction for the JT-60SC large superconducting tokamak. A steady-state operation scenario with HH{sub y2} = 1.4 and {beta}{sub N} = 3.7 has been obtained at I{sub p} = 1.5 MA, B{sub t} = 2 T, and q{sub 95} = 5, where noninductive currents are developed during the discharge to form a current hole with beam-driven currents by tangential off-axis beams in combination with bootstrap currents by additional on-axis perpendicular beams. The bootstrap fraction increases up to {approx}75% of the plasma current, and the current hole region is enlarged up to {approx}30% of the minor radius at 35 s from the discharge initiation. The current hole is confirmed to be sustained afterward for a long duration of 60 s. The present transport simulation shows that heating equipment designed for JT-60SC is capable of forming and sustaining the current hole only by using off-axis beam-driven currents and bootstrap currents. The stability analysis shows that the beta limit with the conducting wall can be {approx}{beta}{sub N} = 4.5, which is substantially above the no-wall ideal magnetohydrodynamic limit.
- OSTI ID:
- 20849706
- Journal Information:
- Fusion Science and Technology, Vol. 45, Issue 4; Other Information: Copyright (c) 2006 American Nuclear Society (ANS), United States, All rights reserved. http://epubs.ans.org/; Country of input: International Atomic Energy Agency (IAEA); ISSN 1536-1055
- Country of Publication:
- United States
- Language:
- English
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