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Title: Progress toward steady-state tokamak operation exploiting the high bootstrap current fraction regime

Recent DIII-D experiments have increased the normalized fusion performance of the high bootstrap current fraction tokamak regime toward reactor-relevant steady state operation. The experiments, conducted by a joint team of researchers from the DIII-D and EAST tokamaks, developed a fully noninductive scenario that could be extended on EAST to a demonstration of long pulse steady-state tokamak operation. Improved understanding of scenario stability has led to the achievement of very high values of β p and β N despite strong ITBs. Good confinement has been achieved with reduced toroidal rotation. These high β p plasmas challenge the energy transport understanding, especially in the electron energy channel. A new turbulent transport model, named 2 TGLF-SAT1, has been developed which improves the transport prediction. Experiments extending results to long pulse on EAST, based on the physics basis developed at DIII-D, have been conducted. Finally, more investigations will be carried out on EAST with more additional auxiliary power to come online in the near term.
ORCiD logo [1] ;  [2] ;  [1] ;  [3] ; ORCiD logo [2] ;  [4] ;  [2] ; ORCiD logo [2] ;  [5] ;  [1] ;  [5] ; ORCiD logo [2] ;  [6] ;  [1] ;  [1] ;  [1] ;  [1] ; ORCiD logo [1]
  1. Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Plasma Physics
  2. General Atomics, San Diego, CA (United States)
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  4. Univ. of Wisconsin, Madison, WI (United States). Dept. of Engineering Physics
  5. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  6. Univ. of California, San Diego, CA (United States). Center for Energy Research
Publication Date:
Grant/Contract Number:
FC02-04ER54698; AC52-07NA27344; FG02-08ER54999; AC02-09CH11466; FG02-07ER54917; FG02-06ER54871
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 23; Journal Issue: 6; Journal ID: ISSN 1070-664X
American Institute of Physics (AIP)
Research Org:
General Atomics, San Diego, CA (United States)
Sponsoring Org:
USDOE; National Magnetic Confinement Fusion Program of China
Contributing Orgs:
Institute of Plasma Physics, Chinese Academy of Science, Hefei, Anhui 230031, China Lawrence Livermore National Laboratory, Livermore, California 94551, USA University of Wisconsin-Madison, 1500 Engineering Drive, Madison, Wisconsin 53706-1609, USA Princeton Plasma Physics Laboratory, PO Box 451, Princeton, New Jersey 08543-0451, USA University of California San Diego, 9500 Gilman Dr., La Jolla, CA 92093-0417, US
Country of Publication:
United States
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Internal transport barrier; Tokamaks; Torque; Turbulent transport processes; Toroidal plasma confinement
OSTI Identifier:
Alternate Identifier(s):
OSTI ID: 1258328