Global ion heating/transport during merging spherical tokamak formation

Tanabe, H.; Tanaka, H.; Cao, Q.; Cai, Y.; Akimitsu, M.; Ahmadi, T.; Cheng, C. Z.; Inomoto, M.; Ono, Y.

doi:10.1088/1741-4326/ac217c

Title: Global ion heating/transport during merging spherical tokamak formation

Journal Article · Thu Sep 16 00:00:00 EDT 2021 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/ac217c· OSTI ID:1888536

^[1]; Tanaka, H. ^[1];

^[2]; Cai, Y. ^[1]; Akimitsu, M. ^[1];

^[1];

^[3];

^[1]; Ono, Y. ^[1]

Univ. of Tokyo (Japan)
Univ. of Tokyo (Japan); Univ. of Shanghai (China)
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)

Here we report global ion heating/transport characteristics of magnetic reconnection during merging spherical tokamak formation experiment on TS-6 (TS-3U). Using the 96CH/320CH ultra high resolution ion Doppler tomography diagnostics, the full-2D imaging measurement clearly revealed that magnetic reconnection initially forms localized hot spots in the downstream region of outflow jet with inboard/outboard asymmetry (more deposition in the high field side) but the continuous accumulation of the heating coupled with transport process expands the high temperature region globally and forms characteristic poloidally ring-like structure aligned with field lines. The dynamic ion heating/transport process is also affected by the polarity of toroidal field and poloidally tilted/rotating global structure has experimentally been found both during and after merging. The characteristic poloidal asymmetry gets flipped when toroidal field direction is reversed and it was found that higher temperature appears in the positive potential side, which is opposite to the conventional understanding/prediction of guide field reconnection. Through the parallel acceleration process coupled with global heat transport, poloidally asymmetric non-classical feature has experimentally been found for the first time.

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

Sponsoring Organization:: USDOE; National Institute for Fusion Science (NIFS); Japan Society for the Promotion of Science (JSPS)

Grant/Contract Number:: AC02-09CH11466

OSTI ID:: 1888536

Journal Information:: Nuclear Fusion, Vol. 61, Issue 10; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

References (46)

Observation of Ion Acceleration and Heating during Collisionless Magnetic Reconnection in a Laboratory Plasma Yoo, Jongsoo; Yamada, Masaaki; Ji, Hantao Physical Review Letters, Vol. 110, Issue 21 https://doi.org/10.1103/physrevlett.110.215007	journal	May 2013
Achievement of Record $β$ in the START Spherical Tokamak Gryaznevich, M.; Akers, R.; Carolan, P. G. Physical Review Letters, Vol. 80, Issue 18 https://doi.org/10.1103/physrevlett.80.3972	journal	May 1998
Magnetic Reconnection Triggering Magnetohydrodynamic Instabilities during a Sawtooth Crash in a Tokamak Plasma Chapman, I. T.; Scannell, R.; Cooper, W. A. Physical Review Letters, Vol. 105, Issue 25 https://doi.org/10.1103/physrevlett.105.255002	journal	December 2010
A loop-top hard X-ray source in a compact solar flare as evidence for magnetic reconnection Masuda, S.; Kosugi, T.; Hara, H. Nature, Vol. 371, Issue 6497 https://doi.org/10.1038/371495a0	journal	October 1994
Two-dimensional ion temperature measurement by application of tomographic reconstruction to Doppler spectroscopy Tanabe, H.; Kuwahata, A.; Oka, H. Nuclear Fusion, Vol. 53, Issue 9 https://doi.org/10.1088/0029-5515/53/9/093027	journal	August 2013
Solenoid-free plasma start-up in spherical tokamaks Raman, R.; Shevchenko, V. F. Plasma Physics and Controlled Fusion, Vol. 56, Issue 10 https://doi.org/10.1088/0741-3335/56/10/103001	journal	September 2014
Laboratory study of diffusion region with electron energization during high guide field reconnection Yamasaki, K.; Inoue, S.; Kamio, S. Physics of Plasmas, Vol. 22, Issue 10 https://doi.org/10.1063/1.4932345	journal	October 2015
First Global Doppler Tomography Measurement of Ion Heating of Merging Tokamak Plasmas Tanaka, Haruaki; Ono, Yasushi; Tanabe, Hiroshi IEEJ Transactions on Fundamentals and Materials, Vol. 139, Issue 8 https://doi.org/10.1541/ieejfms.139.358	journal	August 2019
Electron and Ion Heating Characteristics during Magnetic Reconnection in the MAST Spherical Tokamak Tanabe, H.; Yamada, T.; Watanabe, T. Physical Review Letters, Vol. 115, Issue 21 https://doi.org/10.1103/physrevlett.115.215004	journal	November 2015
High-beta characteristics of first and second-stable spherical tokamaks in reconnection heating experiments of TS-3 Ono, Y.; Kimura, T.; Kawamori, E. Nuclear Fusion, Vol. 43, Issue 8 https://doi.org/10.1088/0029-5515/43/8/321	journal	August 2003
$H$ -Mode Operation in the START Spherical Tokamak Sykes, A.; Akers, R. J.; Appel, L. C. Physical Review Letters, Vol. 84, Issue 3 https://doi.org/10.1103/physrevlett.84.495	journal	January 2000
Study of driven magnetic reconnection in a laboratory plasma Yamada, Masaaki; Ji, Hantao; Hsu, Scott Physics of Plasmas, Vol. 4, Issue 5 https://doi.org/10.1063/1.872336	journal	May 1997
Two-fluid and magnetohydrodynamic modelling of magnetic reconnection in the MAST spherical tokamak and the solar corona Browning, P. K.; Cardnell, S.; Evans, M. Plasma Physics and Controlled Fusion, Vol. 58, Issue 1 https://doi.org/10.1088/0741-3335/58/1/014041	journal	November 2015
Noninductively Driven Tokamak Plasmas at Near-Unity Toroidal Beta Schlossberg, D. J.; Bodner, G. M.; Bongard, M. W. Physical Review Letters, Vol. 119, Issue 3, Article No. 035001 https://doi.org/10.1103/physrevlett.119.035001	journal	July 2017
Conversion of magnetic energy in the magnetic reconnection layer of a laboratory plasma Yamada, Masaaki; Yoo, Jongsoo; Jara-Almonte, Jonathan Nature Communications, Vol. 5, Issue 1 https://doi.org/10.1038/ncomms5774	journal	September 2014
Recent Progress in High Resolution 2D Imaging Measurements of Reconnection Heating during Merging Plasma Startup in TS-3 Tanabe, Hiroshi; Cao, Qinghong; Tanaka, Haruaki Plasma and Fusion Research, Vol. 14, Issue 0 https://doi.org/10.1585/pfr.14.3401110	journal	July 2019
Numerical study of energy conversion mechanism of magnetic reconnection in the presence of high guide field Inoue, S.; Ono, Y.; Tanabe, H. Nuclear Fusion, Vol. 55, Issue 8 https://doi.org/10.1088/0029-5515/55/8/083014	journal	July 2015
Magnetic Reconnection in Astrophysical and Laboratory Plasmas Zweibel, Ellen G.; Yamada, Masaaki Annual Review of Astronomy and Astrophysics, Vol. 47, Issue 1 https://doi.org/10.1146/annurev-astro-082708-101726	journal	September 2009
Experimental Verification of the Role of Electron Pressure in Fast Magnetic Reconnection with a Guide Field Fox, W.; Sciortino, F.; v. Stechow, A. Physical Review Letters, Vol. 118, Issue 12 https://doi.org/10.1103/physrevlett.118.125002	journal	March 2017
Effects of reconnection downstream conditions on electron parallel acceleration during the merging start-up of a spherical tokamak Inomoto, M.; Ushiki, T.; Guo, X. Nuclear Fusion, Vol. 59, Issue 8 https://doi.org/10.1088/1741-4326/ab1e0f	journal	July 2019
Effective heating of nonadiabatic protons in magnetic reconnection with a guide field Usami, Shunsuke; Horiuchi, Ritoku; Ohtani, Hiroaki Physics of Plasmas, Vol. 24, Issue 9 https://doi.org/10.1063/1.4997453	journal	September 2017
Ion and Electron Heating Characteristics of Magnetic Reconnection in a Two Flux Loop Merging Experiment Ono, Y.; Tanabe, H.; Hayashi, Y. Physical Review Letters, Vol. 107, Issue 18 https://doi.org/10.1103/physrevlett.107.185001	journal	October 2011
Centre-solenoid-free merging start-up of spherical tokamak plasmas in UTST Inomoto, M.; Watanabe, T. G.; Gi, K. Nuclear Fusion, Vol. 55, Issue 3 https://doi.org/10.1088/0029-5515/55/3/033013	journal	February 2015
Localized electron heating during magnetic reconnection in MAST Yamada, T.; Tanabe, H.; Watanabe, T. G. Nuclear Fusion, Vol. 56, Issue 10 https://doi.org/10.1088/0029-5515/56/10/106019	journal	August 2016
Fusion performance of spherical and conventional tokamaks: implications for compact pilot plants and reactors Costley, A. E.; McNamara, S. A. M. Plasma Physics and Controlled Fusion, Vol. 63, Issue 3 https://doi.org/10.1088/1361-6587/abcdfc	journal	January 2021
Investigation of fine structure formation of guide field reconnection during merging plasma startup of spherical tokamak in TS-3U Tanabe, H.; Cao, Q.; Tanaka, H. Nuclear Fusion, Vol. 59, Issue 8 https://doi.org/10.1088/1741-4326/ab1cdf	journal	July 2019
Investigation of merging/reconnection heating during solenoid-free startup of plasmas in the MAST Spherical Tokamak Tanabe, H.; Yamada, T.; Watanabe, T. Nuclear Fusion, Vol. 57, Issue 5 https://doi.org/10.1088/1741-4326/aa6608	journal	April 2017
Advancing local helicity injection for non-solenoidal tokamak startup Bongard, M. W.; Bodner, G. M.; Burke, M. G. Nuclear Fusion, Vol. 59, Issue 7 https://doi.org/10.1088/1741-4326/ab17e3	journal	May 2019
Application of Tomographic Ion Doppler Spectroscopy to Merging Plasma Startup in the MAST Spherical Tokamak Tanabe, Hiroshi; Yamada, Takuma; Watanabe, Takenori Plasma and Fusion Research, Vol. 11, Issue 0 https://doi.org/10.1585/pfr.11.1302093	journal	January 2016
Simultaneous Observation of Reconnection Inflow and Outflow Associated with the 2010 August 18 Solar Flare Takasao, Shinsuke; Asai, Ayumi; Isobe, Hiroaki The Astrophysical Journal, Vol. 745, Issue 1 https://doi.org/10.1088/2041-8205/745/1/l6	journal	December 2011
Reconnection heating experiments and simulations for torus plasma merging start-up Ono, Y.; Inoue, S.; Tanabe, H. Nuclear Fusion, Vol. 59, Issue 7 https://doi.org/10.1088/1741-4326/ab14a4	journal	June 2019
Overview and status of construction of ST40 Gryaznevich, M.; Asunta, O. Fusion Engineering and Design, Vol. 123 https://doi.org/10.1016/j.fusengdes.2017.03.011	journal	November 2017
Recent progress of magnetic reconnection research in the MAST spherical tokamak Tanabe, H.; Yamada, T.; Watanabe, T. Physics of Plasmas, Vol. 24, Issue 5 https://doi.org/10.1063/1.4977922	journal	May 2017
Ion and electron heating characteristics of magnetic reconnection in tokamak plasma merging experiments Ono, Y.; Tanabe, H.; Yamada, T. Plasma Physics and Controlled Fusion, Vol. 54, Issue 12 https://doi.org/10.1088/0741-3335/54/12/124039	journal	November 2012
Experimental studies of magnetic reconnection Brown, M. R. Physics of Plasmas, Vol. 6, Issue 5 https://doi.org/10.1063/1.873430	journal	May 1999
Merging-compression formation of high temperature tokamak plasma Gryaznevich, M. P.; Sykes, A. Nuclear Fusion, Vol. 57, Issue 7 https://doi.org/10.1088/1741-4326/aa4ffd	journal	March 2017
Plasma Motions and Heating by Magnetic Reconnection in a 2007 may 19 Flare Hara, Hirohisa; Watanabe, Tetsuya; Harra, Louise K. The Astrophysical Journal, Vol. 741, Issue 2 https://doi.org/10.1088/0004-637x/741/2/107	journal	October 2011
Plasma generation and confinement in a toroidal magnetic cusp Egedal, J.; Fasoli, A.; Porkolab, M. Review of Scientific Instruments, Vol. 71, Issue 9 https://doi.org/10.1063/1.1287340	journal	September 2000
Overview of recent physics results from MAST Kirk, A.; Adamek, J.; Akers, R. J. Nuclear Fusion, Vol. 57, Issue 10 https://doi.org/10.1088/1741-4326/aa65e0	journal	June 2017
Two Dimensional Imaging Measurement of Magnetic Reconnection Outflow in the TS-4 Toroidal Plasma Merging Experiment Tanabe, Hiroshi; Oka, Hirotaka; Annoura, Masanobu Plasma and Fusion Research, Vol. 8, Issue 0 https://doi.org/10.1585/pfr.8.2405088	journal	January 2013
Electron Bernstein wave assisted plasma current start-up in MAST Shevchenko, V. F.; O'Brien, M. R.; Taylor, D. Nuclear Fusion, Vol. 50, Issue 2 https://doi.org/10.1088/0029-5515/50/2/022004	journal	January 2010
High power heating of magnetic reconnection in merging tokamak experimentsa) Ono, Y.; Tanabe, H.; Yamada, T. Physics of Plasmas, Vol. 22, Issue 5 https://doi.org/10.1063/1.4920944	journal	May 2015
Ion Acceleration and Direct Ion Heating in Three-Component Magnetic Reconnection Ono, Y.; Yamada, M.; Akao, T. Physical Review Letters, Vol. 76, Issue 18 https://doi.org/10.1103/physrevlett.76.3328	journal	April 1996
Magnetic reconnection Yamada, Masaaki; Kulsrud, Russell; Ji, Hantao Reviews of Modern Physics, Vol. 82, Issue 1 https://doi.org/10.1103/revmodphys.82.603	journal	March 2010
Spontaneous Formation of Plasmoid during Early Magnetic Reconnection Phase of Two Merging Tokamaks Cao, Qinghong; Cai, Yunhan; Akimitsu, Moe IEEJ Transactions on Electrical and Electronic Engineering, Vol. 15, Issue 9 https://doi.org/10.1002/tee.23208	journal	July 2020
Dependence of the pickup-like ion effective heating on the poloidal and toroidal magnetic fields during magnetic reconnection Usami, Shunsuke; Horiuchi, Ritoku; Ohtani, Hiroaki Physics of Plasmas, Vol. 26, Issue 10 https://doi.org/10.1063/1.5099423	journal	October 2019

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