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Title: Control of Plasma-Stored Energy for Burn Control using DIII-D In-Vessel Coils

A new approach has been experimentally demonstrated to control the stored energy by applying a non-axisymmetric magnetic field using the DIII-D in-vessel coils to modify the energy confinement time. In future burning plasma experiments as well as magnetic fusion energy power plants, various concepts have been proposed to control the fusion power. The fusion power in a power plant operating at high gain can be related to the plasma-stored energy and hence, is a strong function of the energy confinement time. Thus, an actuator, that modifies the confinement time, can be used to adjust the fusion power. In relatively low collisionality DIII-D discharges, the application of non-axisymmetric magnetic fields results in a decrease in confinement time and density pumpout. Gas puffing was used to compensate the density pumpout in the pedestal while control of the stored energy was demonstrated by the application of non-axisymmetric fields.
Authors:
 [1] ;  [2] ;  [1] ;  [2] ;  [1] ;  [1] ;  [1] ;  [2] ;  [3]
  1. PPPL
  2. General Atomics
  3. MIT
Publication Date:
OSTI Identifier:
1182601
Report Number(s):
PPPL-5071
DOE Contract Number:
DE-AC02-09CH11466
Resource Type:
Conference
Resource Relation:
Conference: 25th IAEA Fusion Energy Conference, St. Petersburg, Russia, 13-18 October 2014.
Publisher:
IAEA
Research Org:
Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
Sponsoring Org:
USDOE
Contributing Orgs:
1Princeton Plasma Physics Laboratory, PO Box 451, Princeton, NJ 08543-0451, USA; General Atomics, PO Box 85608, San Diego, CA 92186-5608, USA; Massachusetts Institute of Technology, 77 Massachusetts Ave, Cambridge, MA 02139, USA
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY Fusion reactors