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Logan NC, Hu Q, Paz-Soldan C, Nazikian R, Rhodes T, Wilks T, Munaretto S, Bortolon A, Laggner F, Scotti F, Hong R, Wang H. Improved Particle Confinement with Resonant Magnetic Perturbations in DIII-D Tokamak H-Mode Plasmas. PHYSICAL REVIEW LETTERS 2022; 129:205001. [PMID: 36461991 DOI: 10.1103/physrevlett.129.205001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/06/2022] [Revised: 07/22/2022] [Accepted: 10/12/2022] [Indexed: 06/17/2023]
Abstract
Experiments on the DIII-D tokamak have identified a novel regime in which applied resonant magnetic perturbations (RMPs) increase the particle confinement and overall performance. This Letter details a robust range of counter-current rotation over which RMPs cause this density pump-in effect for high confinement (H mode) plasmas. The pump in is shown to be caused by a reduction of the turbulent transport and to be correlated with a change in the sign of the induced neoclassical transport. This novel reversal of the RMP induced transport has the potential to significantly improve reactor relevant, three-dimensional magnetic confinement scenarios.
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Affiliation(s)
- N C Logan
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - Q Hu
- Princeton Plasma Physics Laboratory, Princeton, New Jersey 08540, USA
| | - C Paz-Soldan
- General Atomics, San Diego, California 92186, USA
| | - R Nazikian
- Princeton Plasma Physics Laboratory, Princeton, New Jersey 08540, USA
| | - T Rhodes
- University of California, Los Angeles, Los Angeles, California 90095, USA
| | - T Wilks
- Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - S Munaretto
- General Atomics, San Diego, California 92186, USA
| | - A Bortolon
- Princeton Plasma Physics Laboratory, Princeton, New Jersey 08540, USA
| | - F Laggner
- Princeton Plasma Physics Laboratory, Princeton, New Jersey 08540, USA
| | - F Scotti
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - R Hong
- University of California, Los Angeles, Los Angeles, California 90095, USA
| | - H Wang
- General Atomics, San Diego, California 92186, USA
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2
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Error field correction strategies in preparation to MAST-U operation. FUSION ENGINEERING AND DESIGN 2020. [DOI: 10.1016/j.fusengdes.2020.111932] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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3
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Liang Y. Overview of Edge-Localized Mode Control in Tokamak Plasmas. FUSION SCIENCE AND TECHNOLOGY 2017. [DOI: 10.13182/fst11-a11699] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Y. Liang
- Forschungszentrum Jülich GmbH, Association EURATOM-FZ Jülich Institut für Energieforschung – Plasmaphysik, Trilateral Euregio Cluster, D-52425 Jülich, Germany
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4
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Reimerdes H, Buttery RJ, Garofalo AM, In Y, La Haye RJ, Lanctot MJ, Okabayashi M, Park JK, Schaffer MJ, Strait EJ, Volpe FA. Error Field Tolerance and Error Field Correction Strategies and Their Applicability to ITER. FUSION SCIENCE AND TECHNOLOGY 2017. [DOI: 10.13182/fst11-a11698] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
| | | | | | - Y. In
- FAR-TECH, Inc. San Diego, California
| | | | | | - M. Okabayashi
- Princeton Plasma Physics Laboratory, Princeton, New Jersey
| | - J.-K. Park
- Princeton Plasma Physics Laboratory, Princeton, New Jersey
| | | | | | - F. A. Volpe
- University of Wisconsin–Madison, Madison, Wisconsin
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5
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Kikuchi M, Campbell DJ. Physics of Plasma Control Toward Steady-State Operation of ITER. FUSION SCIENCE AND TECHNOLOGY 2017. [DOI: 10.13182/fst11-a11689] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- M. Kikuchi
- Japan Atomic Energy Agency, Mukoyama 801-1, Naka, Ibaraki 311-0193, Japan
| | - D. J. Campbell
- ITER Organization, Route de Vinon sur Verdon, F-13115 St Paul lez Durance, France
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6
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King JD, Strait EJ, Boivin RL, Taussig D, Watkins MG, Hanson JM, Logan NC, Paz-Soldan C, Pace DC, Shiraki D, Lanctot MJ, La Haye RJ, Lao LL, Battaglia DJ, Sontag AC, Haskey SR, Bak JG. An upgrade of the magnetic diagnostic system of the DIII-D tokamak for non-axisymmetric measurements. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2014; 85:083503. [PMID: 25173265 DOI: 10.1063/1.4891817] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The DIII-D tokamak magnetic diagnostic system [E. J. Strait, Rev. Sci. Instrum. 77, 023502 (2006)] has been upgraded to significantly expand the measurement of the plasma response to intrinsic and applied non-axisymmetric "3D" fields. The placement and design of 101 additional sensors allow resolution of toroidal mode numbers 1 ≤ n ≤ 3, and poloidal wavelengths smaller than MARS-F, IPEC, and VMEC magnetohydrodynamic model predictions. Small 3D perturbations, relative to the equilibrium field (10(-5) < δB/B0 < 10(-4)), require sub-millimeter fabrication and installation tolerances. This high precision is achieved using electrical discharge machined components, and alignment techniques employing rotary laser levels and a coordinate measurement machine. A 16-bit data acquisition system is used in conjunction with analog signal-processing to recover non-axisymmetric perturbations. Co-located radial and poloidal field measurements allow up to 14.2 cm spatial resolution of poloidal structures (plasma poloidal circumference is ~500 cm). The function of the new system is verified by comparing the rotating tearing mode structure, measured by 14 BP fluctuation sensors, with that measured by the upgraded B(R) saddle loop sensors after the mode locks to the vessel wall. The result is a nearly identical 2/1 helical eigenstructure in both cases.
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Affiliation(s)
- J D King
- Oak Ridge Institute for Science and Education, Oak Ridge, Tennessee 378300-8050, USA
| | - E J Strait
- General Atomics, P.O. Box 85608, San Diego, California 92186-5608, USA
| | - R L Boivin
- General Atomics, P.O. Box 85608, San Diego, California 92186-5608, USA
| | - D Taussig
- General Atomics, P.O. Box 85608, San Diego, California 92186-5608, USA
| | - M G Watkins
- General Atomics, P.O. Box 85608, San Diego, California 92186-5608, USA
| | - J M Hanson
- Department of Applied Physics and Applied Mathematics, Columbia University, 116th and Broadway, New York, New York 10027, USA
| | - N C Logan
- Princeton Plasma Physics Laboratory, P.O. Box 451, Princeton, New Jersey 08543-0451, USA
| | - C Paz-Soldan
- Oak Ridge Institute for Science and Education, Oak Ridge, Tennessee 378300-8050, USA
| | - D C Pace
- General Atomics, P.O. Box 85608, San Diego, California 92186-5608, USA
| | - D Shiraki
- Department of Applied Physics and Applied Mathematics, Columbia University, 116th and Broadway, New York, New York 10027, USA
| | - M J Lanctot
- General Atomics, P.O. Box 85608, San Diego, California 92186-5608, USA
| | - R J La Haye
- General Atomics, P.O. Box 85608, San Diego, California 92186-5608, USA
| | - L L Lao
- General Atomics, P.O. Box 85608, San Diego, California 92186-5608, USA
| | - D J Battaglia
- Princeton Plasma Physics Laboratory, P.O. Box 451, Princeton, New Jersey 08543-0451, USA
| | - A C Sontag
- Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, Tennessee 37831, USA
| | - S R Haskey
- Plasma Research Laboratory, Research School of Physical Sciences and Engineering, The Australia National University, Canberra, ACT 0200, Australia
| | - J G Bak
- Research and Development Division, National Fusion Research Center, Daejeon, South Korea
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7
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Park JK, Jeon YM, Menard JE, Ko WH, Lee SG, Bae YS, Joung M, You KI, Lee KD, Logan N, Kim K, Ko JS, Yoon SW, Hahn SH, Kim JH, Kim WC, Oh YK, Kwak JG. Rotational resonance of nonaxisymmetric magnetic braking in the KSTAR tokamak. PHYSICAL REVIEW LETTERS 2013; 111:095002. [PMID: 24033042 DOI: 10.1103/physrevlett.111.095002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/10/2013] [Indexed: 06/02/2023]
Abstract
One of the important rotational resonances in nonaxisymmetric neoclassical transport has been experimentally validated in the KSTAR tokamak by applying highly nonresonant n=1 magnetic perturbations to rapidly rotating plasmas. These so-called bounce-harmonic resonances are expected to occur in the presence of magnetic braking perturbations when the toroidal rotation is fast enough to resonate with periodic parallel motions of trapped particles. The predicted and observed resonant peak along with the toroidal rotation implies that the toroidal rotation in tokamaks can be controlled naturally in favorable conditions to stability, using nonaxisymmetric magnetic perturbations.
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Affiliation(s)
- J-K Park
- Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543, USA
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8
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Kim K, Park JK, Boozer AH. Numerical verification of bounce-harmonic resonances in neoclassical toroidal viscosity for tokamaks. PHYSICAL REVIEW LETTERS 2013; 110:185004. [PMID: 23683209 DOI: 10.1103/physrevlett.110.185004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/16/2012] [Indexed: 06/02/2023]
Abstract
This Letter presents the first numerical verification for the bounce-harmonic (BH) resonance phenomena of the neoclassical transport in a tokamak perturbed by nonaxisymmetric magnetic fields. The BH resonances were predicted by analytic theories of neoclassical toroidal viscosity (NTV), as the parallel and perpendicular drift motions can be resonant and result in a great enhancement of the radial momentum transport. A new drift-kinetic δf guiding-center particle code, POCA, clearly verified that the perpendicular drift motions can reduce the transport by phase-mixing, but in the BH resonances the motions can form closed orbits and particles radially drift out fast. The POCA calculations on resulting NTV torque are largely consistent with analytic calculations, and show that the BH resonances can easily dominate the NTV torque when a plasma rotates in the perturbed tokamak and therefore, is a critical physics for predicting the rotation and stability in the International Thermonuclear Experimental Reactor.
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Affiliation(s)
- Kimin Kim
- Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543, USA.
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9
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Seol J, Lee SG, Park BH, Lee HH, Terzolo L, Shaing KC, You KI, Yun GS, Kim CC, Lee KD, Ko WH, Kwak JG, Kim WC, Oh YK, Kim JY, Kim SS, Ida K. Effects of electron-cyclotron-resonance-heating-induced internal kink mode on the toroidal rotation in the KSTAR Tokamak. PHYSICAL REVIEW LETTERS 2012; 109:195003. [PMID: 23215391 DOI: 10.1103/physrevlett.109.195003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2012] [Indexed: 06/01/2023]
Abstract
It is observed that the magnitude of the toroidal rotation speed is reduced by the central electron cyclotron resonance heating (ECRH) regardless of the direction of the toroidal rotation. The magnetohydrodynamics activities generally appear with the rotation change due to ECRH. It is shown that the internal kink mode is induced by the central ECRH and breaks the toroidal symmetry. When the magnetohydrodynamics activities are present, the toroidal plasma viscosity is not negligible. The observed effects of ECRH on the toroidal plasma rotation are explained by the neoclassical toroidal viscosity in this Letter. It is found that the neoclassical toroidal viscosity torque caused by the internal kink mode damps the toroidal rotation.
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Affiliation(s)
- J Seol
- National Fusion Research Institute, Gwahangno 113, Yuseong-gu, Daejeon 305-333, Korea
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10
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Rossel J, Moret JM, Martin Y, Pochon G. Physics design of a saddle coil system for TCV. FUSION ENGINEERING AND DESIGN 2011. [DOI: 10.1016/j.fusengdes.2011.05.011] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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11
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Cole AJ, Callen JD, Solomon WM, Garofalo AM, Hegna CC, Lanctot MJ, Reimerdes H. Observation of peak neoclassical toroidal viscous force in the DIII-D tokamak. PHYSICAL REVIEW LETTERS 2011; 106:225002. [PMID: 21702606 DOI: 10.1103/physrevlett.106.225002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/21/2010] [Indexed: 05/31/2023]
Abstract
Observation of a theoretically predicted peak in the neoclassical toroidal viscosity (NTV) force as a function of toroidal plasma rotation rate Ω is reported. The NTV was generated by applying n=3 magnetic fields from internal coils to low Ω plasmas produced with nearly balanced neutral beam injection. Locally, the peak corresponds to a toroidal rotation rate Ω(0) where the radial electric field E(r) is near zero as determined by radial ion force balance.
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Affiliation(s)
- A J Cole
- University of Wisconsin, Madison, Wisconsin 53706-1609, USA
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12
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Hegna CC, Callen JD, Cole AJ. Rotation Properties of Tokamak Plasmas. FUSION SCIENCE AND TECHNOLOGY 2011. [DOI: 10.13182/fst11-a11705] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- C. C. Hegna
- University of Wisconsin, Department of Engineering Physics, Madison, Wisconsin 53706
| | - J. D. Callen
- University of Wisconsin, Department of Engineering Physics, Madison, Wisconsin 53706
| | - A. J. Cole
- University of Wisconsin, Department of Engineering Physics, Madison, Wisconsin 53706
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13
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Sun Y, Liang Y, Shaing KC, Koslowski HR, Wiegmann C, Zhang T. Neoclassical toroidal plasma viscosity torque in collisionless regimes in tokamaks. PHYSICAL REVIEW LETTERS 2010; 105:145002. [PMID: 21230838 DOI: 10.1103/physrevlett.105.145002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2010] [Indexed: 05/30/2023]
Abstract
Bumpiness in a magnetic field enhances the magnitude of the plasma viscosity and increases the rate of the plasma flow damping. A general solution of the neoclassical toroidal plasma viscosity (NTV) torque induced by nonaxisymmetric magnetic perturbation (NAMP) in the collisionless regimes in tokamaks is obtained in this Letter. The plasma angular momentum can be strongly changed, when there is a small deviation of the toroidal symmetry caused by a NAMP of the order of 0.1% of the toroidal field strength.
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Affiliation(s)
- Y Sun
- Institute for Energy Research-Plasma Physics, Forschungszentrum Jülich, Association EURATOM-FZJ, Trilateral Euregio Cluster, 52425 Jülich, Germany.
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14
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Nave MFF, Johnson T, Eriksson LG, Crombé K, Giroud C, Mayoral ML, Ongena J, Salmi A, Tala T, Tsalas M. Influence of magnetic field ripple on the intrinsic rotation of tokamak plasmas. PHYSICAL REVIEW LETTERS 2010; 105:105005. [PMID: 20867528 DOI: 10.1103/physrevlett.105.105005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/05/2010] [Indexed: 05/29/2023]
Abstract
Using the unique capability of JET to monotonically change the amplitude of the magnetic field ripple, without modifying other relevant equilibrium conditions, the effect of the ripple on the angular rotation frequency of the plasma column was investigated under the conditions of no external momentum input. The ripple amplitude was varied from 0.08% to 1.5% in Ohmic and ion-cyclotron radio-frequency (ICRF) heated plasmas. In both cases the ripple causes counterrotation, indicating a strong torque due to nonambipolar transport of thermal ions and in the case of ICRF also fast ions.
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Affiliation(s)
- M F F Nave
- Associação EURATOM/IST, Instituto de Plasmas e Fusão Nuclear-Laboratorio Associado, Lisbon, Portugal
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15
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Wade M. Physics and engineering issues associated with edge localized mode control in ITER. FUSION ENGINEERING AND DESIGN 2009. [DOI: 10.1016/j.fusengdes.2009.01.063] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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16
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Wingen A, Spatschek KH. Sheared plasma rotation in partially stochastic magnetic fields. PHYSICAL REVIEW LETTERS 2009; 102:185002. [PMID: 19518879 DOI: 10.1103/physrevlett.102.185002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/08/2008] [Indexed: 05/27/2023]
Abstract
It is shown that resonant magnetic perturbations generate sheared flow velocities in magnetized plasmas. Stochastic magnetic fields in incomplete chaos influence the drift motion of electrons and ions differently. Using a fast mapping technique, it is demonstrated that a radial electric field is generated due to the different behavior of passing particles (electrons and ions) in tokamak geometry; magnetic trapping of ions is neglected. Radial profiles of the polodial velocity resulting from the force balance in the presence of a strong toroidal magnetic field are obtained. Scaling laws for plasma losses and the forms of sheared plasma rotation profiles are discussed.
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Affiliation(s)
- A Wingen
- Institut für Theoretische Physik, Heinrich-Heine-Universität Düsseldorf, D-40225 Düsseldorf, Germany
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17
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Park JK, Boozer AH, Menard JE. Nonambipolar transport by trapped particles in tokamaks. PHYSICAL REVIEW LETTERS 2009; 102:065002. [PMID: 19257595 DOI: 10.1103/physrevlett.102.065002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/22/2008] [Indexed: 05/27/2023]
Abstract
Small nonaxisymmetric perturbations of the magnetic field can greatly change the performance of tokamaks through nonambipolar transport. A number of theories have been developed, but the predictions were not consistent with experimental observations in tokamaks. This Letter provides a resolution, with a generalized analytic treatment of the nonambipolar transport. It is shown that the discrepancy between theory and experiment can be greatly reduced by two effects: (1) the small fraction of trapped particles for which the bounce and precession rates resonate; (2) the nonaxisymmetric variation in the field strength along the perturbed magnetic field lines rather than along the unperturbed magnetic field lines. The expected sensitivity of the International Thermonuclear Experimental Reactor to nonaxisymmetries is also discussed.
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Affiliation(s)
- Jong-Kyu Park
- Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543, USA
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