Overview of results from the MST reversed field pinch experiment

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

doi:10.1088/0029-5515/53/10/104017

Overview of results from the MST reversed field pinch experiment

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

Plasma Theory and Modeling

Research output: Contribution to journal › Article › peer-review

35 Scopus citations

Abstract

An overview of recent results from the MST programme on physics important for the advancement of the reversed field pinch (RFP) as well as for improved understanding of toroidal magnetic confinement more generally is reported. Evidence for the classical confinement of ions in the RFP is provided by analysis of impurity ions and energetic ions created by 1 MW neutral beam injection (NBI). The first appearance of energetic-particle-driven modes by NBI in a RFP plasma is described. MST plasmas robustly access the quasi-single-helicity state that has commonalities to the stellarator and 'snake' formation in tokamaks. In MST the dominant mode grows to 8% of the axisymmetric field strength, while the remaining modes are reduced. Predictive capability for tearing mode behaviour has been improved through nonlinear, 3D, resistive magnetohydrodynamic computation using the measured resistivity profile and Lundquist number, which reproduces the sawtooth cycle dynamics. Experimental evidence and computational analysis indicates two-fluid effects, e.g., Hall physics and gyro-viscosity, are needed to understand the coupling of parallel momentum transport and current profile relaxation. Large Reynolds and Maxwell stresses, plus separately measured kinetic stress, indicate an intricate momentum balance and a possible origin for MST's intrinsic plasma rotation. Gyrokinetic analysis indicates that micro-tearing modes can be unstable at high beta, with a critical gradient for the electron temperature that is larger than for tokamak plasmas by roughly the aspect ratio.

Original language	English
Article number	104017
Journal	Nuclear Fusion
Volume	53
Issue number	10
DOIs	https://doi.org/10.1088/0029-5515/53/10/104017
State	Published - Oct 2013

Funding

Funders	Funder number
National Science Foundation	0821899

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1088/0029-5515/53/10/104017

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Sarff, J. S., Almagri, A. F., Anderson, J. K., Borchardt, M., Carmody, D., Caspary, K., Chapman, B. E., Den Hartog, D. J., Duff, J., Eilerman, S., Falkowski, A., Forest, C. B., Goetz, J. A., Holly, D. J., Kim, J. H., King, J., Ko, J., Koliner, J., Kumar, S., ... Hanson, J. D. (2013). Overview of results from the MST reversed field pinch experiment. Nuclear Fusion, 53(10), Article 104017. https://doi.org/10.1088/0029-5515/53/10/104017

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title = "Overview of results from the MST reversed field pinch experiment",

abstract = "An overview of recent results from the MST programme on physics important for the advancement of the reversed field pinch (RFP) as well as for improved understanding of toroidal magnetic confinement more generally is reported. Evidence for the classical confinement of ions in the RFP is provided by analysis of impurity ions and energetic ions created by 1 MW neutral beam injection (NBI). The first appearance of energetic-particle-driven modes by NBI in a RFP plasma is described. MST plasmas robustly access the quasi-single-helicity state that has commonalities to the stellarator and 'snake' formation in tokamaks. In MST the dominant mode grows to 8% of the axisymmetric field strength, while the remaining modes are reduced. Predictive capability for tearing mode behaviour has been improved through nonlinear, 3D, resistive magnetohydrodynamic computation using the measured resistivity profile and Lundquist number, which reproduces the sawtooth cycle dynamics. Experimental evidence and computational analysis indicates two-fluid effects, e.g., Hall physics and gyro-viscosity, are needed to understand the coupling of parallel momentum transport and current profile relaxation. Large Reynolds and Maxwell stresses, plus separately measured kinetic stress, indicate an intricate momentum balance and a possible origin for MST's intrinsic plasma rotation. Gyrokinetic analysis indicates that micro-tearing modes can be unstable at high beta, with a critical gradient for the electron temperature that is larger than for tokamak plasmas by roughly the aspect ratio.",

author = "Sarff, {J. S.} and Almagri, {A. F.} and Anderson, {J. K.} and M. Borchardt and D. Carmody and K. Caspary and Chapman, {B. E.} and {Den Hartog}, {D. J.} and J. Duff and S. Eilerman and A. Falkowski and Forest, {C. B.} and Goetz, {J. A.} and Holly, {D. J.} and Kim, {J. H.} and J. King and J. Ko and J. Koliner and S. Kumar and Lee, {J. D.} and D. Liu and R. Magee and McCollam, {K. J.} and M. McGarry and Mirnov, {V. V.} and Nornberg, {M. D.} and Nonn, {P. D.} and Oliva, {S. P.} and E. Parke and Reusch, {J. A.} and Sauppe, {J. P.} and A. Seltzman and Sovinec, {C. R.} and H. Stephens and D. Stone and D. Theucks and M. Thomas and J. Triana and Terry, {P. W.} and J. Waksman and Bergerson, {W. F.} and Brower, {D. L.} and Ding, {W. X.} and L. Lin and Demers, {D. R.} and P. Fimognari and J. Titus and F. Auriemma and S. Cappello and P. Franz and P. Innocente and R. Lorenzini and E. Martines and B. Momo and P. Piovesan and M. Puiatti and M. Spolaore and D. Terranova and P. Zanca and V. Belykh and Davydenko, {V. I.} and P. Deichuli and Ivanov, {A. A.} and S. Polosatkin and Stupishin, {N. V.} and D. Spong and D. Craig and Harvey, {R. W.} and M. Cianciosa and Hanson, {J. D.}",

year = "2013",

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doi = "10.1088/0029-5515/53/10/104017",

language = "English",

volume = "53",

journal = "Nuclear Fusion",

issn = "0029-5515",

publisher = "IOP Publishing",

number = "10",

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Sarff, JS, Almagri, AF, Anderson, JK, Borchardt, M, Carmody, D, Caspary, K, Chapman, BE, Den Hartog, DJ, Duff, J, Eilerman, S, Falkowski, A, Forest, CB, Goetz, JA, Holly, DJ, Kim, JH, King, J, Ko, J, Koliner, J, Kumar, S, Lee, JD, Liu, D, Magee, R, McCollam, KJ, McGarry, M, Mirnov, VV, Nornberg, MD, Nonn, PD, Oliva, SP, Parke, E, Reusch, JA, Sauppe, JP, Seltzman, A, Sovinec, CR, Stephens, H, Stone, D, Theucks, D, Thomas, M, Triana, J, Terry, PW, Waksman, J, Bergerson, WF, Brower, DL, Ding, WX, Lin, L, Demers, DR, 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, Belykh, V, Davydenko, VI, Deichuli, P, Ivanov, AA, Polosatkin, S, Stupishin, NV, Spong, D, Craig, D, Harvey, RW, Cianciosa, M & Hanson, JD 2013, 'Overview of results from the MST reversed field pinch experiment', Nuclear Fusion, vol. 53, no. 10, 104017. https://doi.org/10.1088/0029-5515/53/10/104017

TY - JOUR

T1 - Overview of results from the MST reversed field pinch experiment

AU - Sarff, J. S.

AU - Almagri, A. F.

AU - Anderson, J. K.

AU - Borchardt, M.

AU - Carmody, D.

AU - Caspary, K.

AU - Chapman, B. E.

AU - Den Hartog, D. J.

AU - Duff, J.

AU - Eilerman, S.

AU - Falkowski, A.

AU - Forest, C. B.

AU - Goetz, J. A.

AU - Holly, D. J.

AU - Kim, J. H.

AU - King, J.

AU - Ko, J.

AU - Koliner, J.

AU - Kumar, S.

AU - Lee, J. D.

AU - Liu, D.

AU - Magee, R.

AU - McCollam, K. J.

AU - McGarry, M.

AU - Mirnov, V. V.

AU - Nornberg, M. D.

AU - Nonn, P. D.

AU - Oliva, S. P.

AU - Parke, E.

AU - Reusch, J. A.

AU - Sauppe, J. P.

AU - Seltzman, A.

AU - Sovinec, C. R.

AU - Stephens, H.

AU - Stone, D.

AU - Theucks, D.

AU - Thomas, M.

AU - Triana, J.

AU - Terry, P. W.

AU - Waksman, J.

AU - Bergerson, W. F.

AU - Brower, D. L.

AU - Ding, W. X.

AU - Lin, L.

AU - Demers, D. R.

AU - Fimognari, P.

AU - Titus, J.

AU - Auriemma, F.

AU - Cappello, S.

AU - Franz, P.

AU - Innocente, P.

AU - Lorenzini, R.

AU - Martines, E.

AU - Momo, B.

AU - Piovesan, P.

AU - Puiatti, M.

AU - Spolaore, M.

AU - Terranova, D.

AU - Zanca, P.

AU - Belykh, V.

AU - Davydenko, V. I.

AU - Deichuli, P.

AU - Ivanov, A. A.

AU - Polosatkin, S.

AU - Stupishin, N. V.

AU - Spong, D.

AU - Craig, D.

AU - Harvey, R. W.

AU - Cianciosa, M.

AU - Hanson, J. D.

PY - 2013/10

Y1 - 2013/10

N2 - An overview of recent results from the MST programme on physics important for the advancement of the reversed field pinch (RFP) as well as for improved understanding of toroidal magnetic confinement more generally is reported. Evidence for the classical confinement of ions in the RFP is provided by analysis of impurity ions and energetic ions created by 1 MW neutral beam injection (NBI). The first appearance of energetic-particle-driven modes by NBI in a RFP plasma is described. MST plasmas robustly access the quasi-single-helicity state that has commonalities to the stellarator and 'snake' formation in tokamaks. In MST the dominant mode grows to 8% of the axisymmetric field strength, while the remaining modes are reduced. Predictive capability for tearing mode behaviour has been improved through nonlinear, 3D, resistive magnetohydrodynamic computation using the measured resistivity profile and Lundquist number, which reproduces the sawtooth cycle dynamics. Experimental evidence and computational analysis indicates two-fluid effects, e.g., Hall physics and gyro-viscosity, are needed to understand the coupling of parallel momentum transport and current profile relaxation. Large Reynolds and Maxwell stresses, plus separately measured kinetic stress, indicate an intricate momentum balance and a possible origin for MST's intrinsic plasma rotation. Gyrokinetic analysis indicates that micro-tearing modes can be unstable at high beta, with a critical gradient for the electron temperature that is larger than for tokamak plasmas by roughly the aspect ratio.

AB - An overview of recent results from the MST programme on physics important for the advancement of the reversed field pinch (RFP) as well as for improved understanding of toroidal magnetic confinement more generally is reported. Evidence for the classical confinement of ions in the RFP is provided by analysis of impurity ions and energetic ions created by 1 MW neutral beam injection (NBI). The first appearance of energetic-particle-driven modes by NBI in a RFP plasma is described. MST plasmas robustly access the quasi-single-helicity state that has commonalities to the stellarator and 'snake' formation in tokamaks. In MST the dominant mode grows to 8% of the axisymmetric field strength, while the remaining modes are reduced. Predictive capability for tearing mode behaviour has been improved through nonlinear, 3D, resistive magnetohydrodynamic computation using the measured resistivity profile and Lundquist number, which reproduces the sawtooth cycle dynamics. Experimental evidence and computational analysis indicates two-fluid effects, e.g., Hall physics and gyro-viscosity, are needed to understand the coupling of parallel momentum transport and current profile relaxation. Large Reynolds and Maxwell stresses, plus separately measured kinetic stress, indicate an intricate momentum balance and a possible origin for MST's intrinsic plasma rotation. Gyrokinetic analysis indicates that micro-tearing modes can be unstable at high beta, with a critical gradient for the electron temperature that is larger than for tokamak plasmas by roughly the aspect ratio.

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U2 - 10.1088/0029-5515/53/10/104017

DO - 10.1088/0029-5515/53/10/104017

M3 - Article

AN - SCOPUS:84884828837

SN - 0029-5515

VL - 53

JO - Nuclear Fusion

JF - Nuclear Fusion

IS - 10

M1 - 104017

ER -

Overview of results from the MST reversed field pinch experiment

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