Observation and Modelling of the Onset of Parametric Decay Instabilities during Gyrotron Operation at ASDEX Upgrade

ASDEX Upgrade Team; S. K. Hansen; S. K. Nielsen; J. Stober; J. Rasmussen; M. Stejner

doi:10.1051/epjconf/201920302007

Observation and Modelling of the Onset of Parametric Decay Instabilities during Gyrotron Operation at ASDEX Upgrade

ASDEX Upgrade Team, S. K. Hansen^*, S. K. Nielsen, J. Stober, J. Rasmussen, M. Stejner

^*Corresponding author for this work

Max Planck Institute for Plasma Physics

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Abstract

We investigate parametric decay instabilities (PDIs) occurring for gyrotron radiation near the upper hybrid resonance at the ASDEX Upgrade tokamak. The PDIs are observed through anomalous millimeter-wave scattering which is recorded using the high-resolution, fast acquisition collective Thomson scattering system installed at ASDEX Upgrade, and an experiment in which such observations are made during a scan of the toroidal magnetic field is performed. A previously published theoretical model is used to calculate the gyrotron power necessary to excite PDIs in the experiment; the theoretical model is capable of predicting whether or not PDIs will be observed at a given toroidal magnetic field with a high degree of accuracy.

Original language	English
Article number	02007
Journal	EPJ Web of Conferences
Volume	203
Number of pages	5
ISSN	2100-014X
DOIs	https://doi.org/10.1051/epjconf/201920302007
Publication status	Published - 2019
Event	20th Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating - Greifswald, Germany Duration: 14 May 2018 → 18 May 2018

Workshop

Workshop	20th Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating
Country/Territory	Germany
City	Greifswald
Period	14/05/2018 → 18/05/2018

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title = "Observation and Modelling of the Onset of Parametric Decay Instabilities during Gyrotron Operation at ASDEX Upgrade",

abstract = "We investigate parametric decay instabilities (PDIs) occurring for gyrotron radiation near the upper hybrid resonance at the ASDEX Upgrade tokamak. The PDIs are observed through anomalous millimeter-wave scattering which is recorded using the high-resolution, fast acquisition collective Thomson scattering system installed at ASDEX Upgrade, and an experiment in which such observations are made during a scan of the toroidal magnetic field is performed. A previously published theoretical model is used to calculate the gyrotron power necessary to excite PDIs in the experiment; the theoretical model is capable of predicting whether or not PDIs will be observed at a given toroidal magnetic field with a high degree of accuracy.",

author = "{ASDEX Upgrade Team} and Hansen, {S. K.} and Nielsen, {S. K.} and J. Stober and J. Rasmussen and M. Stejner",

year = "2019",

doi = "10.1051/epjconf/201920302007",

language = "English",

volume = "203",

journal = "EPJ Web of Conferences",

issn = "2100-014X",

publisher = "E D P Sciences",

note = "20th Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating, EC20 ; Conference date: 14-05-2018 Through 18-05-2018",

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T1 - Observation and Modelling of the Onset of Parametric Decay Instabilities during Gyrotron Operation at ASDEX Upgrade

AU - ASDEX Upgrade Team

AU - Hansen, S. K.

AU - Nielsen, S. K.

AU - Stober, J.

AU - Rasmussen, J.

AU - Stejner, M.

PY - 2019

Y1 - 2019

N2 - We investigate parametric decay instabilities (PDIs) occurring for gyrotron radiation near the upper hybrid resonance at the ASDEX Upgrade tokamak. The PDIs are observed through anomalous millimeter-wave scattering which is recorded using the high-resolution, fast acquisition collective Thomson scattering system installed at ASDEX Upgrade, and an experiment in which such observations are made during a scan of the toroidal magnetic field is performed. A previously published theoretical model is used to calculate the gyrotron power necessary to excite PDIs in the experiment; the theoretical model is capable of predicting whether or not PDIs will be observed at a given toroidal magnetic field with a high degree of accuracy.

AB - We investigate parametric decay instabilities (PDIs) occurring for gyrotron radiation near the upper hybrid resonance at the ASDEX Upgrade tokamak. The PDIs are observed through anomalous millimeter-wave scattering which is recorded using the high-resolution, fast acquisition collective Thomson scattering system installed at ASDEX Upgrade, and an experiment in which such observations are made during a scan of the toroidal magnetic field is performed. A previously published theoretical model is used to calculate the gyrotron power necessary to excite PDIs in the experiment; the theoretical model is capable of predicting whether or not PDIs will be observed at a given toroidal magnetic field with a high degree of accuracy.

U2 - 10.1051/epjconf/201920302007

DO - 10.1051/epjconf/201920302007

M3 - Conference article

SN - 2100-014X

VL - 203

JO - EPJ Web of Conferences

JF - EPJ Web of Conferences

M1 - 02007

T2 - 20th Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating

Y2 - 14 May 2018 through 18 May 2018

ER -

Observation and Modelling of the Onset of Parametric Decay Instabilities during Gyrotron Operation at ASDEX Upgrade

Abstract

Workshop

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