Experimental study of toroidicity induced Alfven eigenmode (TAE) stability at high q(0)

S. H. Batha; F. M. Levinton; D. A. Spong; R. V. Budny; Z. Chang; D. S. Darrow; E. D. Fredrickson; G. Y. Fu; E. Mazzucato; R. Nazikian; S. J. Zweben

doi:10.1088/0029-5515/35/12/I06

Experimental study of toroidicity induced Alfven eigenmode (TAE) stability at high q(0)

S. H. Batha, F. M. Levinton, D. A. Spong, R. V. Budny, Z. Chang, D. S. Darrow, E. D. Fredrickson, G. Y. Fu, E. Mazzucato, R. Nazikian, S. J. Zweben

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Abstract

Experiments to destabilize the toroidicity induced Alfven eigenmode (TAE) by energetic alpha particles were performed on the Tokamak Fusion Test Reactor using deuterium and tritium fuel. To decrease the alpha particle pressure instability threshold, discharges with an elevated value of q(0)>1.5 were used. By raising q(0), the radial location of the low toroidal mode number TAE gaps moves towards the magnetic axis and into alignment with the region of maximum alpha pressure gradient, thereby (in theory) lowering the value of the central alpha particle beta _alpha required for instability. No TAE activity was observed when beta _alpha(0) reached 0.08% in a discharge with fusion power of 2.4 MW. Calculations predict that the alpha driven TAE was weakly unstable.

Original language	English
Article number	I06
Pages (from-to)	1463-1468
Number of pages	6
Journal	Nuclear Fusion
Volume	35
Issue number	12
DOIs	https://doi.org/10.1088/0029-5515/35/12/I06
State	Published - 1995
Externally published	Yes

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title = "Experimental study of toroidicity induced Alfven eigenmode (TAE) stability at high q(0)",

abstract = "Experiments to destabilize the toroidicity induced Alfven eigenmode (TAE) by energetic alpha particles were performed on the Tokamak Fusion Test Reactor using deuterium and tritium fuel. To decrease the alpha particle pressure instability threshold, discharges with an elevated value of q(0)>1.5 were used. By raising q(0), the radial location of the low toroidal mode number TAE gaps moves towards the magnetic axis and into alignment with the region of maximum alpha pressure gradient, thereby (in theory) lowering the value of the central alpha particle beta alpha required for instability. No TAE activity was observed when beta alpha(0) reached 0.08% in a discharge with fusion power of 2.4 MW. Calculations predict that the alpha driven TAE was weakly unstable.",

author = "Batha, {S. H.} and Levinton, {F. M.} and Spong, {D. A.} and Budny, {R. V.} and Z. Chang and Darrow, {D. S.} and Fredrickson, {E. D.} and Fu, {G. Y.} and E. Mazzucato and R. Nazikian and Zweben, {S. J.}",

year = "1995",

doi = "10.1088/0029-5515/35/12/I06",

language = "English",

volume = "35",

pages = "1463--1468",

journal = "Nuclear Fusion",

issn = "0029-5515",

publisher = "IOP Publishing",

number = "12",

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TY - JOUR

T1 - Experimental study of toroidicity induced Alfven eigenmode (TAE) stability at high q(0)

AU - Batha, S. H.

AU - Levinton, F. M.

AU - Spong, D. A.

AU - Budny, R. V.

AU - Chang, Z.

AU - Darrow, D. S.

AU - Fredrickson, E. D.

AU - Fu, G. Y.

AU - Mazzucato, E.

AU - Nazikian, R.

AU - Zweben, S. J.

PY - 1995

Y1 - 1995

N2 - Experiments to destabilize the toroidicity induced Alfven eigenmode (TAE) by energetic alpha particles were performed on the Tokamak Fusion Test Reactor using deuterium and tritium fuel. To decrease the alpha particle pressure instability threshold, discharges with an elevated value of q(0)>1.5 were used. By raising q(0), the radial location of the low toroidal mode number TAE gaps moves towards the magnetic axis and into alignment with the region of maximum alpha pressure gradient, thereby (in theory) lowering the value of the central alpha particle beta alpha required for instability. No TAE activity was observed when beta alpha(0) reached 0.08% in a discharge with fusion power of 2.4 MW. Calculations predict that the alpha driven TAE was weakly unstable.

AB - Experiments to destabilize the toroidicity induced Alfven eigenmode (TAE) by energetic alpha particles were performed on the Tokamak Fusion Test Reactor using deuterium and tritium fuel. To decrease the alpha particle pressure instability threshold, discharges with an elevated value of q(0)>1.5 were used. By raising q(0), the radial location of the low toroidal mode number TAE gaps moves towards the magnetic axis and into alignment with the region of maximum alpha pressure gradient, thereby (in theory) lowering the value of the central alpha particle beta alpha required for instability. No TAE activity was observed when beta alpha(0) reached 0.08% in a discharge with fusion power of 2.4 MW. Calculations predict that the alpha driven TAE was weakly unstable.

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U2 - 10.1088/0029-5515/35/12/I06

DO - 10.1088/0029-5515/35/12/I06

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SN - 0029-5515

VL - 35

SP - 1463

EP - 1468

JO - Nuclear Fusion

JF - Nuclear Fusion

IS - 12

M1 - I06

ER -

Experimental study of toroidicity induced Alfven eigenmode (TAE) stability at high q(0)

Abstract

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