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Title: Power Balance Estimation in Long Duration Discharges on QUEST

Journal Article · · Plasma Science and Technology
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  1. Kyushu Univ. (Japan). Research Inst. for Applied Mechanics
  2. Kyushu Univ. (Japan). Interdisciplinary Graduate School of Engineering Science
  3. Tokai Univ., Kumamoto (Japan). School of Industrial Engineering
  4. Kyushu Univ. (Japan). Graduate School of Technology
  5. Univ. of Tokyo (Japan). Graduate School of Frontier Science
  6. Chinese Academy of Sciences (CAS), Hefei (China). Inst. of Plasma Physics
  7. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  8. Carnegie Inst. of Washington, Argonne, IL (United States). Dept. of Aeronautics & Astronautics
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Fully non-inductive plasma start-up was successfully achieved by using a well-controlled microwave source on the spherical tokamak, QUEST. Non-inductive plasmas were maintained for approximately 3–5 min, during which time power balance estimates could be achieved by monitoring wall and cooling-water temperatures. Approximately 70%–90% of the injected power could be accounted for by calorimetric measurements and approximately half of the injected power was found to be deposited on the vessel wall, which is slightly dependent on the magnetic configuration. Lastly, the power distribution to water-cooled limiters, which are expected to be exposed to local heat loads, depends significantly on the magnetic configuration, however some of the deposited power is due to energetic electrons, which have large poloidal orbits and are likely to be deposited on the plasma facing components.

Research Organization:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Organization:
USDOE; Collaborative Research Program of the Research Institute for Applied Mechanics, Kyushu University; Foresight Program in the Field of Plasma Physics (No. 11261140328).
Grant/Contract Number:
JSPS-NRF-NSFC -A3
OSTI ID:
1335688
Journal Information:
Plasma Science and Technology, Vol. 18, Issue 11; ISSN 1009-0630
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 15 works
Citation information provided by
Web of Science

References (24)

Steady-state tokamak operation, ITB transition and sustainment and ECCD experiments in TRIAM-1M journal October 2005
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Thirty-Minute Plasma Sustainment by ICRF, EC and NBI Heating in the Large Helical Device journal January 2005
Power balance investigation in steady-state LHCD discharges on TRIAM-1M journal September 2006
Global particle balance and wall recycling properties of long duration discharges on TRIAM-1M journal May 2004
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Heat load asymmetries in MAST journal August 2011
Accounting of the power balance for neutral-beam heated H-mode plasmas in NSTX journal March 2005
Divertor heat flux scaling with heating power and plasma current in H-mode discharges in the national spherical torus experiment journal June 2007
“Snowflake” divertor configuration in NSTX journal August 2011
The super X divertor (SXD) and a compact fusion neutron source (CFNS) journal February 2010
Non-Inductive Start up of QUEST Plasma by RF Power journal June 2011
Steady-State Operation Scenario and the First Experimental Result on QUEST journal January 2010
Development of plasma control system for divertor configuration on QUEST journal October 2013
Analytical Solution of High βp Equilibria with Natural Inboard Poloidal Null Configuration Obtained in the Spherical Tokamak QUEST journal January 2014
QUEST Experiments Towards Steady State Operation of Spherical Tokamaks journal January 2012
Thermal imaging of plasma with a phased array antenna in QUEST journal November 2014
Non-inductive current start-up assisted by energetic electrons in Q-shu University experiment with steady-state spherical tokamak journal June 2012
Role of energetic electrons during current ramp-up and production of high poloidal beta plasma in non-inductive current drive on QUEST journal February 2014
Non-Inductive Current Drive by EC Waves in an Inboard Poloidal Magnetic Field Null Configuration on the Spherical Tokamak QUEST journal January 2013
Self organization of high β p plasma equilibrium with an inboard poloidal magnetic field null in QUEST journal July 2015
Metallic dusts behavior in all-metal first wall on TRIAM-1M journal August 2011
High-Harmonic Fast-Wave Power Flow along Magnetic Field Lines in the Scrape-Off Layer of NSTX journal July 2012

Cited By (3)

Summary of magnetic fusion plasma physics in 1st AAPPS-DPP meeting journal March 2018
Initial results from solenoid-free plasma start-up using Transient CHI on QUEST journal September 2018
Particle balance investigation with the combination of the hydrogen barrier model and rate equations of hydrogen state in long duration discharges on an all-metal plasma facing wall in QUEST journal May 2019

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Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
steady state operation
spherical tokamak
plasma wall interaction
power balance