Parametric scattering of extraordinary waves in various electron cyclotron resonance heating schemes for tokamak plasmas

Jukka Heikkinen

Research output: Contribution to journalArticleScientificpeer-review

Abstract

Threshold intensities for parametric side-scattering of extraordinary heating waves off ion cyclotron waves are evaluated for various tokamak heating schemes near the electron cyclotron frequency. It is found that at local electron temperatures Te ~ 15-500 eV in large tokamaks (a gtrsim 0.5 m) the obtained intensity threholds may be of the same order as the intensities presently employed (1-10 kW/cm2) in the experiments. Especially those heating schemes where oblique launching is used may suffer from scattering near the plasma edge or near the turning point of the heating wave. Furthermore, it is found that the parametric scattering studied here has a lower threshold than the parametric decay into an ion acoustic wave and a magnetized Langmuir wave which can make the nonlinear heating method based on the latter process questionable.
Original languageEnglish
Pages (from-to)349 - 354
Number of pages6
JournalPhysica Scripta
Volume33
Issue number4
DOIs
Publication statusPublished - 1986
MoE publication typeNot Eligible

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electron cyclotron resonance
Heating
Plasma
Scattering
Electron
heating
scattering
ion acoustic waves
launching
Turning Point
cyclotron frequency
Acoustic Waves
Oblique
cyclotrons
Decay
electron energy
thresholds
decay
Experiment
ions

Cite this

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title = "Parametric scattering of extraordinary waves in various electron cyclotron resonance heating schemes for tokamak plasmas",
abstract = "Threshold intensities for parametric side-scattering of extraordinary heating waves off ion cyclotron waves are evaluated for various tokamak heating schemes near the electron cyclotron frequency. It is found that at local electron temperatures Te ~ 15-500 eV in large tokamaks (a gtrsim 0.5 m) the obtained intensity threholds may be of the same order as the intensities presently employed (1-10 kW/cm2) in the experiments. Especially those heating schemes where oblique launching is used may suffer from scattering near the plasma edge or near the turning point of the heating wave. Furthermore, it is found that the parametric scattering studied here has a lower threshold than the parametric decay into an ion acoustic wave and a magnetized Langmuir wave which can make the nonlinear heating method based on the latter process questionable.",
author = "Jukka Heikkinen",
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Parametric scattering of extraordinary waves in various electron cyclotron resonance heating schemes for tokamak plasmas. / Heikkinen, Jukka.

In: Physica Scripta, Vol. 33, No. 4, 1986, p. 349 - 354.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Parametric scattering of extraordinary waves in various electron cyclotron resonance heating schemes for tokamak plasmas

AU - Heikkinen, Jukka

PY - 1986

Y1 - 1986

N2 - Threshold intensities for parametric side-scattering of extraordinary heating waves off ion cyclotron waves are evaluated for various tokamak heating schemes near the electron cyclotron frequency. It is found that at local electron temperatures Te ~ 15-500 eV in large tokamaks (a gtrsim 0.5 m) the obtained intensity threholds may be of the same order as the intensities presently employed (1-10 kW/cm2) in the experiments. Especially those heating schemes where oblique launching is used may suffer from scattering near the plasma edge or near the turning point of the heating wave. Furthermore, it is found that the parametric scattering studied here has a lower threshold than the parametric decay into an ion acoustic wave and a magnetized Langmuir wave which can make the nonlinear heating method based on the latter process questionable.

AB - Threshold intensities for parametric side-scattering of extraordinary heating waves off ion cyclotron waves are evaluated for various tokamak heating schemes near the electron cyclotron frequency. It is found that at local electron temperatures Te ~ 15-500 eV in large tokamaks (a gtrsim 0.5 m) the obtained intensity threholds may be of the same order as the intensities presently employed (1-10 kW/cm2) in the experiments. Especially those heating schemes where oblique launching is used may suffer from scattering near the plasma edge or near the turning point of the heating wave. Furthermore, it is found that the parametric scattering studied here has a lower threshold than the parametric decay into an ion acoustic wave and a magnetized Langmuir wave which can make the nonlinear heating method based on the latter process questionable.

U2 - 10.1088/0031-8949/33/4/010

DO - 10.1088/0031-8949/33/4/010

M3 - Article

VL - 33

SP - 349

EP - 354

JO - Physica Scripta

JF - Physica Scripta

SN - 0031-8949

IS - 4

ER -