Overview of results from the MST reversed field pinch experiment

Sarff, J. S.; Almagri, A. F.; Anderson, J. K.; Borchardt, M.; Cappechi, W.; Carmody, D.; Caspary, K.; Chapman, B. E.; Den Hartog, D. J.; Duff, J.; Eilerman, S.; Falkowski, A.; Forest, C. B.; Galante, M.; Goetz, J. A.; Holly, D. J.; Koliner, J.; Kumar, S.; Lee, J. D.; Liu, D.; McCollam, K. J.; McGarry, M.; Mirnov, V. V.; Morton, L.; Munaretto, S.; Nornberg, M. D.; Nonn, P. D.; Oliva, S. P.; Parke, E.; Pueschel, M. J.; Reusch, J. A.; Sauppe, J.; Seltzman, A.; Sovinec, C. R.; Stone, D.; Theucks, D.; Thomas, M.; Triana, J.; Terry, P. W.; Waksman, J.; Whelan, G. C.; Brower, D. L.; Ding, W. X.; Lin, L.; Demers, D. R.; Fimognari, P.; Titus, J.; Auriemma, F.; Cappello, S.; Franz, P.; Innocente, P.; Lorenzini, R.; Martines, E.; Momo, B.; Piovesan, P.; Puiatti, M.; Spolaore, M.; Terranova, D.; Zanca, P.; Davydenko, V. I.; Deichuli, P.; Ivanov, A. A.; Polosatkin, S.; Stupishin, N. V.; Spong, Donald; Craig, D.; Stephens, H.; Harvey, R. W.; Cianciosa, M.; Hanson, J. D.; Breizman, B. N.; Li, M.; Zheng, L. J.

doi:10.1088/0029-5515/55/10/104006

Overview of results from the MST reversed field pinch experiment

Journal Article · Fri Mar 27 04:00:00 EDT 2015 · Nuclear Fusion

DOI:https://doi.org/10.1088/0029-5515/55/10/104006· OSTI ID:1661269

Sarff, J. S. ^[1]; Almagri, A. F. ^[1]; Anderson, J. K. ^[1]; Borchardt, M. ^[1]; Cappechi, W. ^[1]; Carmody, D. ^[1]; Caspary, K. ^[1]; Chapman, B. E. ^[1]; Den Hartog, D. J. ^[1]; Duff, J. ^[1]; Eilerman, S. ^[1]; Falkowski, A. ^[1]; Forest, C. B. ^[1]; Galante, M. ^[1]; Goetz, J. A. ^[1]; Holly, D. J. ^[1]; Koliner, J. ^[1]; Kumar, S. ^[1]; Lee, J. D. ^[1]; Liu, D. ^[1] more »

Univ. of Wisconsin, Madison, WI (United States); Center for Magnetic Self-Organization in Lab. and Astrophysical Plasmas, Madison, WI (United States)
Univ. of California, Los Angeles, CA (United States)
Xantho Technologies, LLC, Madison, WI (United States)
Florida A & M University, Tallahassee, FL (United States)
Associazione EURATOM-ENEA sulla Fusione, Padova (Italy). Consorzio RFX
Budker Inst. of Nuclear Physics, Novosibirsk (Russia)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Wheaton College, IL (United States)
Pierce College, Lakewood, WA (United States)
CompX, Del Mar, CA (United States)
Auburn Univ., AL (United States)
Univ. of Texas, Austin, TX (United States)

An overview of recent results from the MST reversed field pinch programme is presented here. With neutral beam injection, bursty energetic particle (EP) modes are observed. The profiles of the magnetic and density fluctuations associated with these EP modes are measured using a far infrared interferometer–polarimeter. Equilibrium reconstructions of the quasi-single-helicity 3D helical state are provided by the V3FIT code that now incorporates several of MST's advanced diagnostics. The orientation of the helical structure is controlled using a new resonant magnetic perturbation technique. Gyrokinetic simulations based on experimental equilibria predict unstable trapped-electron modes (TEMs), and small-scale density fluctuations are detected in improved-confinement plasmas with TEM-like features. Upgraded pellet injection permits study of density and beta limits over MST's full range of operation, and an MST-record line-average density of 0.9 × 1020 m3 (n/nG = 1.4) has been obtained. Impurity ion temperature measurements reveal a charge-to-mass-ratio dependence in the rapid heating that occurs during a sawtooth crash. Runaway of NBI-born fast ions during the impulsive sawtooth event agrees with test-particle theory. Magnetic self-organization studies include measurements of the dynamo emf with an applied ac inductive electric field using oscillating field current drive.

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES); National Science Foundation (NSF)

DOE Contract Number:: AC05-00OR22725; FC02-05ER54814

OSTI ID:: 1661269

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 10 Vol. 55; ISSN 0029-5515

Publisher:: IOP Science

Country of Publication:: United States

Language:: English

References (39)

Mass-Dependent Ion Heating during Magnetic Reconnection in a Laboratory Plasma Fiksel, G.; Almagri, A. F.; Chapman, B. E. Physical Review Letters, Vol. 103, Issue 14 https://doi.org/10.1103/PhysRevLett.103.145002	journal	September 2009
Time-resolved ion energy distribution measurements using an advanced neutral particle analyzer on the MST reversed-field pinch Eilerman, S.; Anderson, J. K.; Reusch, J. A. Review of Scientific Instruments, Vol. 83, Issue 10 https://doi.org/10.1063/1.4728312	journal	October 2012
Plasma behaviour at high β and high density in the Madison Symmetric Torus RFP Wyman, M. D.; Chapman, B. E.; Ahn, J. W. Nuclear Fusion, Vol. 49, Issue 1 https://doi.org/10.1088/0029-5515/49/1/015003	journal	December 2008
Gyrokinetic studies of microinstabilities in the reversed field pinch Carmody, D.; Pueschel, M. J.; Terry, P. W. Physics of Plasmas, Vol. 20, Issue 5 https://doi.org/10.1063/1.4803509	journal	May 2013
Ion Acceleration during Reconnection in MAST Helander, P.; Eriksson, L. -G.; Akers, R. J. Physical Review Letters, Vol. 89, Issue 23 https://doi.org/10.1103/PhysRevLett.89.235002	journal	November 2002
Observation of Velocity-Independent Electron Transport in the Reversed Field Pinch O’Connell, R.; Hartog, D. J. Den; Forest, C. B. Physical Review Letters, Vol. 91, Issue 4 https://doi.org/10.1103/PhysRevLett.91.045002	journal	July 2003
Observation of Weak Impact of a Stochastic Magnetic Field on Fast-Ion Confinement Fiksel, G.; Hudson, B.; Den Hartog, D. J. Physical Review Letters, Vol. 95, Issue 12 https://doi.org/10.1103/PhysRevLett.95.125001	journal	September 2005
Fast-Particle-Driven Alfvénic Modes in a Reversed Field Pinch Koliner, J. J.; Forest, C. B.; Sarff, J. S. Physical Review Letters, Vol. 109, Issue 11 https://doi.org/10.1103/PhysRevLett.109.115003	journal	September 2012
Charge-to-mass-ratio-dependent ion heating during magnetic reconnection in the MST RFP Kumar, S. T. A.; Almagri, A. F.; Craig, D. Physics of Plasmas, Vol. 20, Issue 5 https://doi.org/10.1063/1.4804958	journal	May 2013
Oscillating-Field Current-Drive Experiments in a Reversed Field Pinch McCollam, K. J.; Blair, A. P.; Prager, S. C. Physical Review Letters, Vol. 96, Issue 3 https://doi.org/10.1103/PhysRevLett.96.035003	journal	January 2006
Magnetic turbulence suppression by a helical mode in a cylindrical geometry Kim, J. -H.; Terry, P. W. Physics of Plasmas, Vol. 19, Issue 12 https://doi.org/10.1063/1.4769369	journal	December 2012
Ion Runaway in Tokamak Discharges Furth, H. P.; Rutherford, P. H. Physical Review Letters, Vol. 28, Issue 9 https://doi.org/10.1103/PhysRevLett.28.545	journal	February 1972
Equilibrium evolution in oscillating-field current-drive experiments McCollam, K. J.; Anderson, J. K.; Blair, A. P. Physics of Plasmas, Vol. 17, Issue 8 https://doi.org/10.1063/1.3461167	journal	August 2010
The Hall dynamo effect and nonlinear mode coupling during sawtooth magnetic reconnection Ding, W. X.; Brower, D. L.; Deng, B. H. Physics of Plasmas, Vol. 13, Issue 11 https://doi.org/10.1063/1.2363353	journal	November 2006
The three-dimensional magnetohydrodynamics of ac helicity injection in the reversed field pinch Ebrahimi, F.; Prager, S. C.; Sarff, J. S. Physics of Plasmas, Vol. 10, Issue 4 https://doi.org/10.1063/1.1555622	journal	April 2003
Microturbulence studies of pulsed poloidal current drive discharges in the reversed field pinch Carmody, D.; Pueschel, M. J.; Anderson, J. K. Physics of Plasmas, Vol. 22, Issue 1 https://doi.org/10.1063/1.4905709	journal	January 2015
Runaway of energetic test ions in a toroidal plasma Eilerman, S.; Anderson, J. K.; Sarff, J. S. Physics of Plasmas, Vol. 22, Issue 2 https://doi.org/10.1063/1.4907662	journal	February 2015
Time-dependent behavior in a transport-barrier model for the quasi-single helcity state Terry, P. W.; Whelan, G. G. Plasma Physics and Controlled Fusion, Vol. 56, Issue 9 https://doi.org/10.1088/0741-3335/56/9/094002	journal	August 2014
Anomalous impurity ion heating from Alfvénic cascade in the reversed field pinch Tangri, Varun; Terry, P. W.; Fiksel, Gennady Physics of Plasmas, Vol. 15, Issue 11 https://doi.org/10.1063/1.2998829	journal	November 2008
Study of the scaling of magnetic fluctuations in the RFX reversed field pinch ¹ Terranova, D.; Bolzonella, T.; Cappello, S. Plasma Physics and Controlled Fusion, Vol. 42, Issue 7 https://doi.org/10.1088/0741-3335/42/7/307	journal	June 2000
On the energy transport in internal transport barriers of RFP plasmas Lorenzini, R.; Alfier, A.; Auriemma, F. Nuclear Fusion, Vol. 52, Issue 6 https://doi.org/10.1088/0029-5515/52/6/062004	journal	April 2012
Tokamak-like confinement at high beta and low field in the reversed field pinch Sarff, J. S.; Anderson, J. K.; Biewer, T. M. Plasma Physics and Controlled Fusion, Vol. 45, Issue 12A https://doi.org/10.1088/0741-3335/45/12A/029	journal	November 2003
Density limits in toroidal plasmas Greenwald, Martin Plasma Physics and Controlled Fusion, Vol. 44, Issue 8 https://doi.org/10.1088/0741-3335/44/8/201	journal	July 2002
The Madison Symmetric Torus Dexter, R. N.; Kerst, D. W.; Lovell, T. W. Fusion Technology, Vol. 19, Issue 1 https://doi.org/10.13182/FST91-A29322	journal	January 1991
Self-organized helical equilibria as a new paradigm for ohmically heated fusion plasmas Lorenzini, R.; Martines, E.; Piovesan, P. Nature Physics, Vol. 5, Issue 8 https://doi.org/10.1038/nphys1308	journal	June 2009
Fast ion confinement and stability in a neutral beam injected reversed field pinch Anderson, J. K.; Almagri, A. F.; Den Hartog, D. J. Physics of Plasmas, Vol. 20, Issue 5 https://doi.org/10.1063/1.4801749	journal	May 2013
V3FIT: a code for three-dimensional equilibrium reconstruction Hanson, James D.; Hirshman, Steven P.; Knowlton, Stephen F. Nuclear Fusion, Vol. 49, Issue 7 https://doi.org/10.1088/0029-5515/49/7/075031	journal	July 2009
Momentum transport and flow damping in the reversed-field pinch plasma Almagri, A. F.; Chapman, J. T.; Chiang, C. S. Physics of Plasmas, Vol. 5, Issue 11 https://doi.org/10.1063/1.873118	journal	November 1998
Overview of results from the MST reversed field pinch experiment Sarff, J. S.; Almagri, A. F.; Anderson, J. K. Nuclear Fusion, Vol. 53, Issue 10 https://doi.org/10.1088/0029-5515/53/10/104017	journal	September 2013
Time-Resolved Observation of Discrete and Continuous Magnetohydrodynamic Dynamo in the Reversed-Field Pinch Edge Ji, H.; Almagri, A. F.; Prager, S. C. Physical Review Letters, Vol. 73, Issue 5, p. 668-671 https://doi.org/10.1103/PhysRevLett.73.668	journal	August 1994
Energetic-particle-driven instabilities and induced fast-ion transport in a reversed field pinch Lin, L.; Anderson, J. K.; Brower, D. L. Physics of Plasmas, Vol. 21, Issue 5 https://doi.org/10.1063/1.4872029	journal	May 2014
Bifurcation in Viscoresistive MHD: The Hartmann Number and the Reversed Field Pinch Cappello, S.; Escande, D. F. Physical Review Letters, Vol. 85, Issue 18 https://doi.org/10.1103/PhysRevLett.85.3838	journal	October 2000
Quasi-steady-state toroidal discharges Bevir, M. K.; Gimblett, C. G.; Miller, Guthrie Physics of Fluids, Vol. 28, Issue 6 https://doi.org/10.1063/1.864926	journal	January 1985
First-order finite-Larmor-radius fluid modeling of tearing and relaxation in a plasma pinch King, J. R.; Sovinec, C. R.; Mirnov, V. V. Physics of Plasmas, Vol. 19, Issue 5 https://doi.org/10.1063/1.3695346	journal	May 2012
Measurements of the momentum and current transport from tearing instability in the Madison Symmetric Torus reversed-field pinch Kuritsyn, A.; Fiksel, G.; Almagri, A. F. Physics of Plasmas, Vol. 16, Issue 5 https://doi.org/10.1063/1.3090325	journal	May 2009
Observation of tearing mode deceleration and locking due to eddy currents induced in a conducting shell Chapman, B. E.; Fitzpatrick, R.; Craig, D. Physics of Plasmas, Vol. 11, Issue 5 https://doi.org/10.1063/1.1689353	journal	May 2004
Measurement of energetic-particle-driven core magnetic fluctuations and induced fast-ion transport Lin, L.; Ding, W. X.; Brower, D. L. Physics of Plasmas, Vol. 20, Issue 3 https://doi.org/10.1063/1.4798397	journal	March 2013
Spectroscopic Constraints on Models of Ion Cyclotron Resonance Heating in the Polar Solar Corona and High‐Speed Solar Wind Cranmer, Steven R.; Field, George B.; Kohl, John L. The Astrophysical Journal, Vol. 518, Issue 2 https://doi.org/10.1086/307330	journal	June 1999
Anisotropic Ion Heating and Tail Generation during Tearing Mode Magnetic Reconnection in a High-Temperature Plasma Magee, R. M.; Den Hartog, D. J.; Kumar, S. T. A. Physical Review Letters, Vol. 107, Issue 6 https://doi.org/10.1103/PhysRevLett.107.065005	journal	August 2011

Similar Records

Sawteeth in the MST reversed field pinch

Technical Report · Sat Sep 01 00:00:00 EDT 1990 · OSTI ID:5651889

Sawteeth in MST reversed-field pinch

Thesis/Dissertation · Sun Dec 31 23:00:00 EST 1989 · OSTI ID:5314091

Fluctuation reduction and enhanced confinement in the MST reversed-field pinch

Thesis/Dissertation · Wed Oct 01 00:00:00 EDT 1997 · OSTI ID:544706

Related Subjects

beta limit
density limit
energetic particles
gyrokinetics
reversed field pinch
stellarator

Overview of results from the MST reversed field pinch experiment

Citation Formats

References (39)

Similar Records

Related Subjects