Impact of toroidal and poloidal mode spectra on the control of non-axisymmetric fields in tokamaks

Lanctot, Matthew J.; Park, J. -K.; Piovesan, Paolo; Sun, Y.; Buttery, Richard J.; Frassinetti, L.; Grierson, Brian A.; Hanson, Jeremy M.; Haskey, Shaun R.; In, Y.; Jeon, Y. M.; La Haye, Robert J.; Logan, N. C.; Marrelli, L.; Orlov, Dmitry M.; Paz-Soldan, Carlos; Wang, H. H.; Strait, Edward J.

doi:10.1063/1.4982688

Title: Impact of toroidal and poloidal mode spectra on the control of non-axisymmetric fields in tokamaks

Journal Article · Thu May 18 00:00:00 EDT 2017 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4982688· OSTI ID:1373416

^[1]; Park, J. -K. ^[2]; Piovesan, Paolo ^[3]; Sun, Y. ^[4]; Buttery, Richard J. ^[5]; Frassinetti, L. ^[6]; Grierson, Brian A. ^[2]; Hanson, Jeremy M. ^[7];

^[2]; In, Y. ^[8]; Jeon, Y. M. ^[8]; La Haye, Robert J. ^[5]; Logan, N. C. ^[2]; Marrelli, L. ^[9]; Orlov, Dmitry M. ^[10]; Paz-Soldan, Carlos ^[5]; Wang, H. H. ^[4]; Strait, Edward J. ^[5]

General Atomics, San Diego, CA (United States); U.S. Dept. of Energy, Washington, D.C. (United States)
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Univ. di Padova, Padova (Italy)
Chinese Academy of Sciences, Hefei (People's Republic of China)
General Atomics, San Diego, CA (United States)
KTH Royal Institute of Technology, Stockholm (Sweden)
Columbia Univ., New York, NY (United States)
National Fusion Research Institute, Daejeon (South Korea)
Consorzio RFX, EURATOM-ENEA Assoc., Padova (Italy)
Univ. of California San Diego, La Jolla, CA (United States)

In several tokamaks, non-axisymmetric magnetic field studies show that applied magnetic fields with a toroidal harmonic n = 2 can lead to disruptive n = 1 locked modes. In Ohmic plasmas, n = 2 magnetic reconnection thresholds in otherwise stable discharges are readily accessed at edge safety factors q ~ 3, low density, and low rotation. Similar to previous studies with n = 1 fields, the thresholds are correlated with the “overlap” field computed with the IPEC code. The overlap field quantifies the plasma-mediated coupling of the external field to the resonant field. Remarkably, the “critical overlap fields” at which magnetic islands form are similar for applied n =1 and 2 fields. The critical overlap field increases with plasma density and edge safety factor but is independent of the toroidal field. Poloidal harmonics m > nq dominate the drive for resonant fields while m < nq harmonics have a negligible impact. This contrasts with previous results in H-mode discharges at high plasma pressure in which the toroidal angular momentum is sensitive to low poloidal harmonics. Altogether, these results highlight unique requirements for n > 1 field control including the need for multiple rows of coils to control selected plasma parameters for specific functions (e.g., rotation control or ELM suppression).

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Research Organization:: General Atomics, San Diego, CA (United States)

Sponsoring Organization:: USDOE

Contributing Organization:: JET Contributors

Grant/Contract Number:: FC02-04ER54698; AC02-09CH11466; FG02-04ER54761; FG02-05ER54809

OSTI ID:: 1373416

Alternate ID(s):: OSTI ID: 1361859

Journal Information:: Physics of Plasmas, Vol. 24, Issue 5; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 16 works

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