Alfvenic behavior of alpha particle driven ion cyclotron emission in TFTR

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Ion cyclotron emission (ICE) has been observed during D-T discharges in the Tokamak Fusion Test Reactor (TFTR), using rf probes located near the top and bottom of the vacuum vessel. Harmonics of the alpha cyclotron frequency ({Omega}{sub {alpha}}) evaluated at the outer midplane plasma edge are observed at the onset of the beam injection phase of TFTR supershots, and persist for approximately 100-250 ms. These results are in contrast with observations of ICE in JET, in which harmonics of {Omega}{sub {alpha}} evolve with the alpha population in the plasma edge. Such differences are believed to be due to the fact ... continued below

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23 p.

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Cauffman, S.; Majeski, R. & McClements, K.G. July 1, 1995.

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Description

Ion cyclotron emission (ICE) has been observed during D-T discharges in the Tokamak Fusion Test Reactor (TFTR), using rf probes located near the top and bottom of the vacuum vessel. Harmonics of the alpha cyclotron frequency ({Omega}{sub {alpha}}) evaluated at the outer midplane plasma edge are observed at the onset of the beam injection phase of TFTR supershots, and persist for approximately 100-250 ms. These results are in contrast with observations of ICE in JET, in which harmonics of {Omega}{sub {alpha}} evolve with the alpha population in the plasma edge. Such differences are believed to be due to the fact that newly-born fusion alpha particles are super-Alfvenic near the edge of JET plasmas, while they are sub-Alfvenic near the edge of TFTR supershot plasmas. In TFTR discharges with edge densities such that newly-born alpha particles are super-Alfvenic, alpha cyclotron harmonics are observed to persist. These results are in qualitative agreement with numerical calculations of growth rates due to the magnetoacoustic cyclotron instability.

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23 p.

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INIS; OSTI as DE95016254

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  • Other Information: PBD: Jul 1995

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  • Other: DE95016254
  • Report No.: PPPL--3119
  • Grant Number: AC02-76CH03073
  • DOI: 10.2172/93736 | External Link
  • Office of Scientific & Technical Information Report Number: 93736
  • Archival Resource Key: ark:/67531/metadc794767

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Office of Scientific & Technical Information Technical Reports

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

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  • July 1, 1995

Added to The UNT Digital Library

  • Dec. 19, 2015, 7:14 p.m.

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  • April 15, 2016, 6:58 p.m.

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Cauffman, S.; Majeski, R. & McClements, K.G. Alfvenic behavior of alpha particle driven ion cyclotron emission in TFTR, report, July 1, 1995; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc794767/: accessed October 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.