Search for alpha driven TAEs at lowered ion temperature in TFTR DT discharges

S. J. Zweben; R. V. Budny; C. Z. Cheng; E. D. Fredrickson; G. Y. Fu; D. R. Mikkelsen; G. L. Schmidt; S. D. Scott; D. A. Spong; C. E. Bush; Z. Chang; D. S. Darrow; R. J. Fonck; L. R. Grisham; E. Mazzucato; R. Nazikian; D. K. Owens; H. K. Park; S. F. Paul; J. F. Schivell; J. D. Strachan; E. J. Synakowski; G. Taylor; K. M. Young

doi:10.1088/0029-5515/36/8/I04

Search for alpha driven TAEs at lowered ion temperature in TFTR DT discharges

S. J. Zweben, R. V. Budny, C. Z. Cheng, E. D. Fredrickson, G. Y. Fu, D. R. Mikkelsen, G. L. Schmidt, S. D. Scott, D. A. Spong, C. E. Bush, Z. Chang, D. S. Darrow, R. J. Fonck, L. R. Grisham, E. Mazzucato, R. Nazikian, D. K. Owens, H. K. Park, S. F. Paul, J. F. SchivellJ. D. Strachan, E. J. Synakowski, G. Taylor, K. M. Young

Institute of Space and Plasma Sciences

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Abstract

An experiment was performed in TFTR DT plasmas in an attempt to destabilize the alpha particle driven toroidicity-induced Alfvén eigenmodes (TAEs) by reducing their thermal ion Landau damping. The thermal ion Landau damping was reduced by transiently lowering the ion temperature using either helium (He) gas puffs or deuterium (D) or lithium (Li) pellet injection during neutral beam injection (NBI) into DT supershots. The ion temperature was successfully lowered from T_i(0) ≈ 20 keV to T_i(0) ≈ 10 keV in about 0.2 s; however, no alpha driven TAEs were observed. Theoretical analyses of the TAE instability of these DT discharges indicate that the alpha pressure required for TAE stability still remained greater than that actually obtained in this experiment, mainly because of the effects of beam ion Landau damping.

Original language	English
Pages (from-to)	987-1008
Number of pages	22
Journal	Nuclear Fusion
Volume	36
Issue number	8
DOIs	https://doi.org/10.1088/0029-5515/36/8/I04
Publication status	Published - 1996 Aug

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics
Condensed Matter Physics

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10.1088/0029-5515/36/8/I04

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Zweben, S. J., Budny, R. V., Cheng, C. Z., Fredrickson, E. D., Fu, G. Y., Mikkelsen, D. R., Schmidt, G. L., Scott, S. D., Spong, D. A., Bush, C. E., Chang, Z., Darrow, D. S., Fonck, R. J., Grisham, L. R., Mazzucato, E., Nazikian, R., Owens, D. K., Park, H. K., Paul, S. F., ... Young, K. M. (1996). Search for alpha driven TAEs at lowered ion temperature in TFTR DT discharges. Nuclear Fusion, 36(8), 987-1008. https://doi.org/10.1088/0029-5515/36/8/I04

@article{ce7a8a31905a47d897fb9c257b9fd206,

title = "Search for alpha driven TAEs at lowered ion temperature in TFTR DT discharges",

abstract = "An experiment was performed in TFTR DT plasmas in an attempt to destabilize the alpha particle driven toroidicity-induced Alfv{\'e}n eigenmodes (TAEs) by reducing their thermal ion Landau damping. The thermal ion Landau damping was reduced by transiently lowering the ion temperature using either helium (He) gas puffs or deuterium (D) or lithium (Li) pellet injection during neutral beam injection (NBI) into DT supershots. The ion temperature was successfully lowered from Ti(0) ≈ 20 keV to Ti(0) ≈ 10 keV in about 0.2 s; however, no alpha driven TAEs were observed. Theoretical analyses of the TAE instability of these DT discharges indicate that the alpha pressure required for TAE stability still remained greater than that actually obtained in this experiment, mainly because of the effects of beam ion Landau damping.",

author = "Zweben, {S. J.} and Budny, {R. V.} and Cheng, {C. Z.} and Fredrickson, {E. D.} and Fu, {G. Y.} and Mikkelsen, {D. R.} and Schmidt, {G. L.} and Scott, {S. D.} and Spong, {D. A.} and Bush, {C. E.} and Z. Chang and Darrow, {D. S.} and Fonck, {R. J.} and Grisham, {L. R.} and E. Mazzucato and R. Nazikian and Owens, {D. K.} and Park, {H. K.} and Paul, {S. F.} and Schivell, {J. F.} and Strachan, {J. D.} and Synakowski, {E. J.} and G. Taylor and Young, {K. M.}",

year = "1996",

month = aug,

doi = "10.1088/0029-5515/36/8/I04",

language = "English",

volume = "36",

pages = "987--1008",

journal = "Nuclear Fusion",

issn = "0029-5515",

publisher = "IOP Publishing Ltd.",

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Zweben, SJ, Budny, RV, Cheng, CZ, Fredrickson, ED, Fu, GY, Mikkelsen, DR, Schmidt, GL, Scott, SD, Spong, DA, Bush, CE, Chang, Z, Darrow, DS, Fonck, RJ, Grisham, LR, Mazzucato, E, Nazikian, R, Owens, DK, Park, HK, Paul, SF, Schivell, JF, Strachan, JD, Synakowski, EJ, Taylor, G & Young, KM 1996, 'Search for alpha driven TAEs at lowered ion temperature in TFTR DT discharges', Nuclear Fusion, vol. 36, no. 8, pp. 987-1008. https://doi.org/10.1088/0029-5515/36/8/I04

TY - JOUR

T1 - Search for alpha driven TAEs at lowered ion temperature in TFTR DT discharges

AU - Zweben, S. J.

AU - Budny, R. V.

AU - Cheng, C. Z.

AU - Fredrickson, E. D.

AU - Fu, G. Y.

AU - Mikkelsen, D. R.

AU - Schmidt, G. L.

AU - Scott, S. D.

AU - Spong, D. A.

AU - Bush, C. E.

AU - Chang, Z.

AU - Darrow, D. S.

AU - Fonck, R. J.

AU - Grisham, L. R.

AU - Mazzucato, E.

AU - Nazikian, R.

AU - Owens, D. K.

AU - Park, H. K.

AU - Paul, S. F.

AU - Schivell, J. F.

AU - Strachan, J. D.

AU - Synakowski, E. J.

AU - Taylor, G.

AU - Young, K. M.

PY - 1996/8

Y1 - 1996/8

N2 - An experiment was performed in TFTR DT plasmas in an attempt to destabilize the alpha particle driven toroidicity-induced Alfvén eigenmodes (TAEs) by reducing their thermal ion Landau damping. The thermal ion Landau damping was reduced by transiently lowering the ion temperature using either helium (He) gas puffs or deuterium (D) or lithium (Li) pellet injection during neutral beam injection (NBI) into DT supershots. The ion temperature was successfully lowered from Ti(0) ≈ 20 keV to Ti(0) ≈ 10 keV in about 0.2 s; however, no alpha driven TAEs were observed. Theoretical analyses of the TAE instability of these DT discharges indicate that the alpha pressure required for TAE stability still remained greater than that actually obtained in this experiment, mainly because of the effects of beam ion Landau damping.

AB - An experiment was performed in TFTR DT plasmas in an attempt to destabilize the alpha particle driven toroidicity-induced Alfvén eigenmodes (TAEs) by reducing their thermal ion Landau damping. The thermal ion Landau damping was reduced by transiently lowering the ion temperature using either helium (He) gas puffs or deuterium (D) or lithium (Li) pellet injection during neutral beam injection (NBI) into DT supershots. The ion temperature was successfully lowered from Ti(0) ≈ 20 keV to Ti(0) ≈ 10 keV in about 0.2 s; however, no alpha driven TAEs were observed. Theoretical analyses of the TAE instability of these DT discharges indicate that the alpha pressure required for TAE stability still remained greater than that actually obtained in this experiment, mainly because of the effects of beam ion Landau damping.

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U2 - 10.1088/0029-5515/36/8/I04

DO - 10.1088/0029-5515/36/8/I04

M3 - Article

AN - SCOPUS:0030205379

SN - 0029-5515

VL - 36

SP - 987

EP - 1008

JO - Nuclear Fusion

JF - Nuclear Fusion

IS - 8

ER -

Search for alpha driven TAEs at lowered ion temperature in TFTR DT discharges

Abstract

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