skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Use of reconstructed 3D VMEC equilibria to match effects of toroidally rotating discharges in DIII-D

Journal Article · · Nuclear Fusion
 [1];  [1];  [1];  [1];  [1];  [2];  [1];  [3];  [4];  [3];  [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Columbia Univ., New York, NY (United States)
  3. General Atomics, San Diego, CA (United States)
  4. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
+ Show Author Affiliations

A technique for tokamak equilibrium reconstructions is used for multiple DIII-D discharges, including L-mode and H-mode cases when weakly 3-D elds ( B=B 10-3) are applied. The technique couples diagnostics to the non-linear, ideal MHD equilibrium solver VMEC, using the V3FIT code, to nd the most likely 3-D equilibrium based on a suite of measurements. It is demonstrated that V3FIT can be used to nd non-linear 3-D equilibria that are consistent with experimental measurements of the plasma response to very weak 3-D perturbations, as well as with 2-D pro le measurements. Observations at DIII-D show that plasma rotation larger than 20 krad/s changes the relative phase between the applied 3-D elds and the measured plasma response. Discharges with low averaged rotation (10 krad/s) and peaked rotation pro les (40 krad/s) are reconstructed. Similarities and di erences to forward modeled VMEC equilibria, which do not include rotational e ects, are shown. Toroidal phase shifts of up to 30 are found between the measured and forward modeled plasma responses at the highest values of rotation. The plasma response phases of reconstructed equilibra on the other hand match the measured ones. This is the rst time V3FIT has been used to reconstruct weakly 3-D tokamak equilibria.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States); General Atomics, San Diego, CA (United States)
Sponsoring Organization:
USDOE Laboratory Directed Research and Development (LDRD) Program. ORNL Director's R&D; USDOE Office of Science (SC)
Contributing Organization:
Oak Ridge National Laboratory, Oak Ridge, Tennessee, USA Columbia University, New York, New York, USA Princeton Plasma Physics Laboratory, Princeton, New Jersey, USA
Grant/Contract Number:
AC05-00OR22725; FG02-04ER54761; FC02-04ER54698; AC02-09CH11466
OSTI ID:
1331096
Alternate ID(s):
OSTI ID: 1329078; OSTI ID: 1335700; OSTI ID: 1372069
Journal Information:
Nuclear Fusion, Vol. 57, Issue 1; ISSN 0029-5515
Publisher:
IOP ScienceCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 9 works
Citation information provided by
Web of Science

References (18)

Suppression of Large Edge-Localized Modes in High-Confinement DIII-D Plasmas with a Stochastic Magnetic Boundary journal June 2004
Active Control of Type-I Edge-Localized Modes with n = 1 Perturbation Fields in the JET Tokamak journal June 2007
First Observation of Edge Localized Modes Mitigation with Resonant and Nonresonant Magnetic Perturbations in ASDEX Upgrade journal June 2011
Validation of the linear ideal magnetohydrodynamic model of three-dimensional tokamak equilibria journal March 2010
Observation of Plasma Rotation Driven by Static Nonaxisymmetric Magnetic Fields in a Tokamak journal November 2008
Observation of Lobes near the X Point in Resonant Magnetic Perturbation Experiments on MAST journal June 2012
Bifurcated helical core equilibrium states in tokamaks journal June 2013
V3FIT: a code for three-dimensional equilibrium reconstruction journal July 2009
Steepest-descent moment method for three-dimensional magnetohydrodynamic equilibria journal January 1983
Non-axisymmetric equilibrium reconstruction for stellarators, reversed field pinches and tokamaks journal July 2013
A design retrospective of the DIII-D tokamak journal May 2002
Connection between plasma response and resonant magnetic perturbation (RMP) edge localized mode (ELM) suppression in DIII-D journal September 2015
Evidence for the Importance of Trapped Particle Resonances for Resistive Wall Mode Stability in High Beta Tokamak Plasmas journal May 2011
Modeling of fast neutral-beam-generated ions and rotation effects on RWM stability in DIII-D plasmas journal September 2015
Decoupled recovery of energy and momentum with correction of n   =  2 error fields journal July 2015
An upgrade of the magnetic diagnostic system of the DIII-D tokamak for non-axisymmetric measurements journal August 2014
Reconstruction of current profile parameters and plasma shapes in tokamaks journal November 1985
Equilibrium analysis of current profiles in tokamaks journal June 1990

Cited By (3)

3D equilibrium reconstruction with islands journal March 2018
Use of reconstructed 3D equilibria to determine onset conditions of helical cores in tokamaks for extrapolation to ITER journal January 2018
Nonlinear modeling of the effect of n   =  2 resonant magnetic field perturbation on peeling-ballooning modes in KSTAR journal January 2020

Similar Records

Helical core reconstruction of a DIII-D hybrid scenario tokamak discharge
Journal Article · Thu May 18 00:00:00 EDT 2017 · Nuclear Fusion · OSTI ID:1331096
+6 more
V3FIT: a code for three-dimensional equilibrium reconstruction
Journal Article · Thu Jan 01 00:00:00 EST 2009 · Nuclear Fusion · OSTI ID:1331096
+3 more
3D Equilibrium Effects Due to RMP Application on DIII-D
Conference · Wed Jun 20 00:00:00 EDT 2012 · OSTI ID:1331096

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
VMEC
DIII-D
equilibrium reconstruction
plasma response