High frequency core localized modes in neutral beam heated plasmas on TFTR

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Description

A band of high frequency modes in the range 50--150 kHz with intermediate toroidal mode numbers 4 < n < 10 are commonly observed in the core of supershot plasmas on TFTR. Two distinct varieties of MHD modes are identified corresponding to a flute-like mode predominantly appearing around the q = 1 surface and an outward ballooning mode for q > 1. The flute-like modes have nearly equal amplitude on the high field and low field side of the magnetic axis and are mostly observed in moderate performance supershot plasmas with {tau}{sub E} < 2{tau}{sub L} while the ballooning-like modes ... continued below

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40 p.

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Nazikian, R.; Chang, Z. & Fredrickson, E.D. November 1, 1995.

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Description

A band of high frequency modes in the range 50--150 kHz with intermediate toroidal mode numbers 4 < n < 10 are commonly observed in the core of supershot plasmas on TFTR. Two distinct varieties of MHD modes are identified corresponding to a flute-like mode predominantly appearing around the q = 1 surface and an outward ballooning mode for q > 1. The flute-like modes have nearly equal amplitude on the high field and low field side of the magnetic axis and are mostly observed in moderate performance supershot plasmas with {tau}{sub E} < 2{tau}{sub L} while the ballooning-like modes have enhanced amplitude on the low field side of the magnetic axis and tend to appear in higher performance supershot plasmas with {tau}{sub E} > 2{tau}{sub L}, where {tau}{sub L} is the equivalent L-mode confinement time. The modes propagate in the ion diamagnetic drift direction and are highly localized with radial widths {Delta}r {approximately} 5--10 cm, fluctuation levels {tilde n}/n, {tilde T}{sub e}/T{sub e} < 0.01, and radial displacements {zeta}{sub r} {approximately} 0.1 cm. Unlike the toroidally localized high-n activity observed just prior to major and minor disruptions on TFTR, these modes are typically much weaker, more benign, and may be indicative of kinetic ballooning modes destabilized by resonant circulating neutral beam ions.

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40 p.

Notes

INIS; OSTI as DE96007482

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  • Other Information: PBD: Nov 1995

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  • Other: DE96007482
  • Report No.: PPPL--3140
  • Grant Number: AC02-76CH03073
  • DOI: 10.2172/206576 | External Link
  • Office of Scientific & Technical Information Report Number: 206576
  • Archival Resource Key: ark:/67531/metadc666549

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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Creation Date

  • November 1, 1995

Added to The UNT Digital Library

  • June 29, 2015, 9:42 p.m.

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  • April 15, 2016, 5:32 p.m.

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Nazikian, R.; Chang, Z. & Fredrickson, E.D. High frequency core localized modes in neutral beam heated plasmas on TFTR, report, November 1, 1995; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc666549/: accessed December 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.