Effect of sawtooth crashes on fast ion distribution in NSTX-U

Liu, D.; Heidbrink, W. W.; Podestà, M.; Hao, G. Z.; Darrow, D. S.; Fredrickson, E. D.; Kim, D.

doi:10.1088/1741-4326/aac64f

Title: Effect of sawtooth crashes on fast ion distribution in NSTX-U

Journal Article · Tue Jul 03 00:00:00 EDT 2018 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/aac64f· OSTI ID:1465666

^[1]; Heidbrink, W. W. ^[1];

^[2];

^[1]; Darrow, D. S. ^[2]; Fredrickson, E. D. ^[2];

^[2]

Univ. of California, Irvine, CA (United States). Dept. of Physics and Astronomy
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)

During the 2016 experimental campaign of NSTX-U (Menard et al 2012 Nucl. Fusion 52 083015), long L-mode and reproducible sawtoothing plasmas have been achieved that were previously not accessible before the upgrade. This provides a good opportunity to study the effect of sawtooth crashes on fast ion confinement and redistribution in spherical tokamaks. The solid-state neutral particle analyzer (SSNPA) and fast ion D-alpha (FIDA) diagnostics on NSTX-U each have a tangentially-viewing instrument and a radially- or vertically-viewing instrument, which are mainly sensitive to passing and trapped fast ions, respectively. It has been observed on both diagnostics that passing particles are strongly expelled from the plasma core to the edge during sawtooth crashes, while trapped fast ions are weakly affected. The tangentially-viewing SSNPA observes large signal spikes at the sawtooth crashes because fast ions move to the edge and charge exchange with edge neutrals. The radially-viewing SSNPA data suggest that there is a small drop of trapped particles in the core. The tangentially-viewing FIDA (t-FIDA) system observes a depletion as large as 25% in the region inside the inversion radius, while an increase at the outer region. There is almost no change in the signals of the vertically-viewing FIDA system. The neutron emission can drop as much as 15% at the sawtooth crashes, accompanied by an increase of edge D_α light. Simulations with the Kadomstev and Porcelli sawtooth models have also been performed and compared with the measurements. The full reconnection Kadomtsev model overestimates the neutron rate drop at each sawtooth crash. When tuning the sawtooth input parameters, the partial reconnection Porcelli sawtooth model can qualitatively reproduce the neutron rate drop and t-FIDA signal drop in the core, but it fails to predict the t-FIDA signal increase at the edge.

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Research Organization:: Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-09CH11466; FG02-06ER54867; FG03-02ER54681

OSTI ID:: 1465666

Journal Information:: Nuclear Fusion, Vol. 58, Issue 8; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 15 works

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References (38)

Energetic ion behaviour in MAST Cecconello, M.; Jones, O. M.; Boeglin, W. U. Plasma Physics and Controlled Fusion, Vol. 57, Issue 1 https://doi.org/10.1088/0741-3335/57/1/014006	journal	November 2014
Sawtooth mixing of alphas, knock-on D, and T ions, and its influence on NPA spectra in ITER plasma Mironov, M. I.; Zaitsev, F. S.; Gorelenkov, N. N. Nuclear Fusion, Vol. 58, Issue 8 https://doi.org/10.1088/1741-4326/aab678	journal	July 2018
Model for the sawtooth period and amplitude Porcelli, F.; Boucher, D.; Rosenbluth, M. N. Plasma Physics and Controlled Fusion, Vol. 38, Issue 12 https://doi.org/10.1088/0741-3335/38/12/010	journal	December 1996
Study of the effect of sawteeth on fast ions and neutron emission in MAST using a neutron camera Cecconello, M.; Sperduti, A. Plasma Physics and Controlled Fusion, Vol. 60, Issue 5 https://doi.org/10.1088/1361-6587/aab6cc	journal	March 2018
Design of solid state neutral particle analyzer array for National Spherical Torus Experiment-Upgrade Liu, D.; Heidbrink, W. W.; Tritz, K. Review of Scientific Instruments, Vol. 85, Issue 11 https://doi.org/10.1063/1.4889913	journal	November 2014
Neutron sawtooth behavior in the PLT, DIII‐D, and TFTR tokamaks Lovberg, J. A.; Heidbrink, W. W.; Strachan, J. D. Physics of Fluids B: Plasma Physics, Vol. 1, Issue 4 https://doi.org/10.1063/1.859012	journal	April 1989
Theory of resonance influence of sawtooth crashes on ions with large orbit width Kolesnichenko, Ya. I.; Lutsenko, V. V.; White, R. B. Physics of Plasmas, Vol. 5, Issue 8 https://doi.org/10.1063/1.873021	journal	August 1998
M3D-K simulations of sawteeth and energetic particle transport in tokamak plasmas Shen, Wei; Fu, G. Y.; Sheng, Zheng-Mao Physics of Plasmas, Vol. 21, Issue 9 https://doi.org/10.1063/1.4896341	journal	September 2014
Compact and multi-view solid state neutral particle analyzer arrays on National Spherical Torus Experiment-Upgrade Liu, D.; Heidbrink, W. W.; Tritz, K. Review of Scientific Instruments, Vol. 87, Issue 11 https://doi.org/10.1063/1.4959798	journal	July 2016
Velocity-space studies of fast-ion transport at a sawtooth crash in neutral-beam heated plasmas Muscatello, C. M.; Heidbrink, W. W.; Kolesnichenko, Ya I. Plasma Physics and Controlled Fusion, Vol. 54, Issue 2 https://doi.org/10.1088/0741-3335/54/2/025006	journal	January 2012
Theory of fast ion transport induced by sawtooth oscillations: Overview and new results Kolesnichenko, Ya. I.; Lutsenko, V. V.; Yakovenko, Yu. V. Physics of Plasmas, Vol. 4, Issue 7 https://doi.org/10.1063/1.872233	journal	July 1997
Effect of sawtooth oscillations on energetic ions Kolesnichenko, Ya. I.; Lutsenko, V. V.; White, R. B. Nuclear Fusion, Vol. 40, Issue 7 https://doi.org/10.1088/0029-5515/40/7/304	journal	July 2000
JET neutron emission profiles and fast ion redistribution during sawtooth crashes Marcus, F. B.; Adams, J. M.; Cheetham, A. D. Plasma Physics and Controlled Fusion, Vol. 33, Issue 4 https://doi.org/10.1088/0741-3335/33/4/001	journal	April 1991
Fast-ion Dα measurements of the fast-ion distribution (invited) Heidbrink, W. W. Review of Scientific Instruments, Vol. 81, Issue 10 https://doi.org/10.1063/1.3478739	journal	October 2010
Midplane neutral density profiles in the National Spherical Torus Experiment Stotler, D. P.; Scotti, F.; Bell, R. E. Physics of Plasmas, Vol. 22, Issue 8 https://doi.org/10.1063/1.4928372	journal	August 2015
Collective Thomson scattering measurements of fast-ion transport due to sawtooth crashes in ASDEX Upgrade Rasmussen, J.; Nielsen, S. K.; Stejner, M. Nuclear Fusion, Vol. 56, Issue 11 https://doi.org/10.1088/0029-5515/56/11/112014	journal	July 2016
Fast-ion redistribution due to sawtooth crash in the TEXTOR tokamak measured by collective Thomson scattering Nielsen, S. K.; Bindslev, H.; Salewski, M. Plasma Physics and Controlled Fusion, Vol. 52, Issue 9 https://doi.org/10.1088/0741-3335/52/9/092001	journal	August 2010
Superbanana orbits and redistribution of marginally trapped fast ions during sawtooth crashes Kolesnichenko, Ya. I.; Lutsenko, V. V.; Yakovenko, Yu. V. Physics of Plasmas, Vol. 5, Issue 3 https://doi.org/10.1063/1.872759	journal	March 1998
Overview of the physics and engineering design of NSTX upgrade Menard, J. E.; Gerhardt, S.; Bell, M. Nuclear Fusion, Vol. 52, Issue 8 https://doi.org/10.1088/0029-5515/52/8/083015	journal	July 2012
Plasma boundary shape control and real-time equilibrium reconstruction on NSTX-U Boyer, M. D.; Battaglia, D. J.; Mueller, D. Nuclear Fusion, Vol. 58, Issue 3 https://doi.org/10.1088/1741-4326/aaa4d0	journal	January 2018
Scintillator based energetic ion loss diagnostic for the National Spherical Torus Experiment Darrow, D. S. Review of Scientific Instruments, Vol. 79, Issue 2 https://doi.org/10.1063/1.2827514	journal	January 2008
ANTIC: A code for calculation of neutral transport in cylindrical plasmas Tamor, S. Journal of Computational Physics, Vol. 40, Issue 1 https://doi.org/10.1016/0021-9991(81)90202-3	journal	March 1981
The NSTX fast-ion D-alpha diagnostic Podestà, M.; Heidbrink, W. W.; Bell, R. E. Review of Scientific Instruments, Vol. 79, Issue 10 https://doi.org/10.1063/1.2956744	journal	October 2008
Fast-ion transport in the presence of magnetic reconnection induced by sawtooth oscillations in ASDEX Upgrade Geiger, B.; Garcia-Munoz, M.; Dux, R. Nuclear Fusion, Vol. 54, Issue 2 https://doi.org/10.1088/0029-5515/54/2/022005	journal	January 2014
Concept of a charged fusion product diagnostic for NSTX Boeglin, W. U.; Valenzuela Perez, R.; Darrow, D. S. Review of Scientific Instruments, Vol. 81, Issue 10 https://doi.org/10.1063/1.3464262	journal	October 2010
A Code that Simulates Fast-Ion D _α and Neutral Particle Measurements Heidbrink, W. W.; Liu, D.; Luo, Y. Communications in Computational Physics, Vol. 10, Issue 3 https://doi.org/10.4208/cicp.190810.080211a	journal	September 2011
Plasma diagnostics in spherical tokamaks with silicon charged-particle detectors Netepenko, A.; Boeglin, W. U.; Darrow, D. S. Review of Scientific Instruments, Vol. 87, Issue 11 https://doi.org/10.1063/1.4955485	journal	August 2016
Modelling of alpha particle slowing down, confinement and redistribution by sawteeth in TFTR using the FPPT code Gorelenkov, N. N.; Budny, R. V.; Duong, H. H. Nuclear Fusion, Vol. 37, Issue 8 https://doi.org/10.1088/0029-5515/37/8/i02	journal	August 1997
Orbit modeling of fast particle redistribution induced by sawtooth instability Kim, D.; Podestà, M.; Liu, D. Nuclear Fusion, Vol. 58, Issue 8 https://doi.org/10.1088/1741-4326/aac10f	journal	July 2018
Overview of NSTX Upgrade initial results and modelling highlights Menard, J. E.; Allain, J. P.; Battaglia, D. J. Nuclear Fusion, Vol. 57, Issue 10, Article No. 102006 https://doi.org/10.1088/1741-4326/aa600a	journal	June 2017
A tangentially viewing fast ion D-alpha diagnostic for NSTX Bortolon, A.; Heidbrink, W. W.; Podestà, M. Review of Scientific Instruments, Vol. 81, Issue 10 https://doi.org/10.1063/1.3495768	journal	October 2010
The tokamak Monte Carlo fast ion module NUBEAM in the National Transport Code Collaboration library Pankin, Alexei; McCune, Douglas; Andre, Robert Computer Physics Communications, Vol. 159, Issue 3 https://doi.org/10.1016/j.cpc.2003.11.002	journal	June 2004
Optimization of the Angular Orientation for a Fast Ion Loss Detector in a Tokamak Darrow, D. S. Fusion Science and Technology, Vol. 71, Issue 2 https://doi.org/10.13182/fst16-236	journal	February 2017
Studies of Internal Disruptions and $m = 1$ Oscillations in Tokamak Discharges with Soft—X-Ray Tecniques von Goeler, S.; Stodiek, W.; Sauthoff, N. Physical Review Letters, Vol. 33, Issue 20 https://doi.org/10.1103/PhysRevLett.33.1201	journal	November 1974
Control of Neoclassical Tearing Modes by Sawtooth Control Sauter, O.; Westerhof, E.; Mayoral, M. L. Physical Review Letters, Vol. 88, Issue 10 https://doi.org/10.1103/PhysRevLett.88.105001	journal	February 2002
Exploration of spherical torus physics in the NSTX device Ono, M.; Kaye, S. M.; Peng, Y. -K. M. Nuclear Fusion, Vol. 40, Issue 3Y https://doi.org/10.1088/0029-5515/40/3Y/316	journal	March 2000
Theory of fast ion transport during sawtooth crashes in tokamaks Kolesnichenko, Ya. I.; Yakovenko, Yu. V. Nuclear Fusion, Vol. 36, Issue 2 https://doi.org/10.1088/0029-5515/36/2/I04	journal	February 1996
Theory of fast ion transport during sawtooth crashes in tokamaks Kolesnichenko, Ya. I.; Yakovenko, Yu. V. Nuclear Fusion, Vol. 36, Issue 4 https://doi.org/10.1088/0029-5515/36/4/514	journal	April 1996

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