Mode structure of disruption precursors in TFTR enhanced reversed shear discharges

M. Okabayashi; E. D. Fredrickson; J. Manickam; G. Taylor; S. H. Batha; M. G. Bell; R. V. Budny; B. LeBlanc; F. M. Levinton; J. Jackson; K. M. McGuire; R. Nazikian; M. C. Zarnstorff

doi:10.1088/0029-5515/38/8/303

Mode structure of disruption precursors in TFTR enhanced reversed shear discharges

M. Okabayashi
, E. D. Fredrickson
, J. Manickam
, G. Taylor
, S. H. Batha
, M. G. Bell
, R. V. Budny
, B. LeBlanc
, F. M. Levinton
, J. Jackson
, K. M. McGuire
, R. Nazikian
, M. C. Zarnstorff

PPPL NSTX

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

8 Scopus citations

Abstract

The mode structure of the disruption precursors in the TFTR enhanced reversed shear (ERS) parameters has been studied by using T_e fluctuation profiles and q profiles obtained from electron cyclotron emission (ECE) and motional Stark effect (MSE) measurements. The observed pro-files of the radial displacement associated with the MHD modes were consistent with the displacement profiles expected from the ideal MHD external kink mode. The observed mode frequencies differ from the plasma toroidal rotation frequency measured with C VI charge exchange recombination light. The independence of the mode frequency from the plasma rotation frequency supports the ideal MHD hypothesis. Possible causes of the frequency difference are discussed.

Original language	English (US)
Pages (from-to)	1149-1160
Number of pages	12
Journal	Nuclear Fusion
Volume	38
Issue number	8
DOIs	https://doi.org/10.1088/0029-5515/38/8/303
State	Published - 1998

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics
Condensed Matter Physics

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10.1088/0029-5515/38/8/303

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title = "Mode structure of disruption precursors in TFTR enhanced reversed shear discharges",

abstract = "The mode structure of the disruption precursors in the TFTR enhanced reversed shear (ERS) parameters has been studied by using Te fluctuation profiles and q profiles obtained from electron cyclotron emission (ECE) and motional Stark effect (MSE) measurements. The observed pro-files of the radial displacement associated with the MHD modes were consistent with the displacement profiles expected from the ideal MHD external kink mode. The observed mode frequencies differ from the plasma toroidal rotation frequency measured with C VI charge exchange recombination light. The independence of the mode frequency from the plasma rotation frequency supports the ideal MHD hypothesis. Possible causes of the frequency difference are discussed.",

author = "M. Okabayashi and Fredrickson, \{E. D.\} and J. Manickam and G. Taylor and Batha, \{S. H.\} and Bell, \{M. G.\} and Budny, \{R. V.\} and B. LeBlanc and Levinton, \{F. M.\} and J. Jackson and McGuire, \{K. M.\} and R. Nazikian and Zarnstorff, \{M. C.\}",

year = "1998",

doi = "10.1088/0029-5515/38/8/303",

language = "English (US)",

volume = "38",

pages = "1149--1160",

journal = "Nuclear Fusion",

issn = "0029-5515",

publisher = "IOP Publishing Ltd.",

number = "8",

}

TY - JOUR

T1 - Mode structure of disruption precursors in TFTR enhanced reversed shear discharges

AU - Okabayashi, M.

AU - Fredrickson, E. D.

AU - Manickam, J.

AU - Taylor, G.

AU - Batha, S. H.

AU - Bell, M. G.

AU - Budny, R. V.

AU - LeBlanc, B.

AU - Levinton, F. M.

AU - Jackson, J.

AU - McGuire, K. M.

AU - Nazikian, R.

AU - Zarnstorff, M. C.

PY - 1998

Y1 - 1998

N2 - The mode structure of the disruption precursors in the TFTR enhanced reversed shear (ERS) parameters has been studied by using Te fluctuation profiles and q profiles obtained from electron cyclotron emission (ECE) and motional Stark effect (MSE) measurements. The observed pro-files of the radial displacement associated with the MHD modes were consistent with the displacement profiles expected from the ideal MHD external kink mode. The observed mode frequencies differ from the plasma toroidal rotation frequency measured with C VI charge exchange recombination light. The independence of the mode frequency from the plasma rotation frequency supports the ideal MHD hypothesis. Possible causes of the frequency difference are discussed.

AB - The mode structure of the disruption precursors in the TFTR enhanced reversed shear (ERS) parameters has been studied by using Te fluctuation profiles and q profiles obtained from electron cyclotron emission (ECE) and motional Stark effect (MSE) measurements. The observed pro-files of the radial displacement associated with the MHD modes were consistent with the displacement profiles expected from the ideal MHD external kink mode. The observed mode frequencies differ from the plasma toroidal rotation frequency measured with C VI charge exchange recombination light. The independence of the mode frequency from the plasma rotation frequency supports the ideal MHD hypothesis. Possible causes of the frequency difference are discussed.

UR - https://www.scopus.com/pages/publications/0032131313

UR - https://www.scopus.com/pages/publications/0032131313#tab=citedBy

U2 - 10.1088/0029-5515/38/8/303

DO - 10.1088/0029-5515/38/8/303

M3 - Article

AN - SCOPUS:0032131313

SN - 0029-5515

VL - 38

SP - 1149

EP - 1160

JO - Nuclear Fusion

JF - Nuclear Fusion

IS - 8

ER -

Mode structure of disruption precursors in TFTR enhanced reversed shear discharges

Abstract

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