Accession Number : ADA087742


Title :   Parametric Instabilities of Electron Cyclotron Waves in Plasmas.


Descriptive Note : Technical rept.,


Corporate Author : MARYLAND UNIV COLLEGE PARK DEPT OF PHYSICS AND ASTRONOMY


Personal Author(s) : Tripathi,V K ; Liu,C S


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a087742.pdf


Report Date : Mar 1980


Pagination or Media Count : 21


Abstract : We have studied the parametric instabilities of electron cyclotron waves in the Elmo Bumpy Torus (EBT) ring and the large tokamaks eg. PLT. In the EBT, the electron cyclotron pump of finite wavenumber k sub o decays into two Bernstein modes at the second harmonic cyclotron layer and can account for the heating of the ring in the intitial phase. The coupling coefficient for this decay vanishes for a dipole pump, whereas the convective threshold with finite k sub o is about 200 W/sq cm. For large tokamaks, the convective threshold for various decay channels turns out to be about or 200 KW/sq cm at 3mm wavelength. (Author)


Descriptors :   *PLASMAS(PHYSICS) , *CYCLOTRON WAVES , ELECTRON DENSITY , HARMONICS , HEATING , TOKAMAKS , DECAY SCHEMES , PARAMETRIC INSTABILITY


Subject Categories : Plasma Physics and Magnetohydrodynamics


Distribution Statement : APPROVED FOR PUBLIC RELEASE