Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 19
Book Description
Electron Cyclotron Heating at Down-shifted Frequencies in Existing Tokamak Devices
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 19
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 19
Book Description
Electron Cyclotron Heating of a Tokamak Reactor at Down-shifted Frequencies
Author: I. Fidone
Publisher:
ISBN:
Category :
Languages : en
Pages : 12
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 12
Book Description
Electron Cyclotron Heating of a Tokamak Reactor at Down-shifted Frequencies
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
The absorption of electron cyclotron waves in a hot and dense tokamak plasma is investigated for the case of the extraordinary mode for outside launching. It is shown that, for electron temperatures T/sub e/ greater than or equal to 5 keV, strong absorption occurs for oblique propagation at frequencies significantly below the electron gyrofrequency at the plasma center. A new density dependence of the wave absorption is found which is more favorable for plasma heating than the familiar n/sub e/−1 scaling.
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
The absorption of electron cyclotron waves in a hot and dense tokamak plasma is investigated for the case of the extraordinary mode for outside launching. It is shown that, for electron temperatures T/sub e/ greater than or equal to 5 keV, strong absorption occurs for oblique propagation at frequencies significantly below the electron gyrofrequency at the plasma center. A new density dependence of the wave absorption is found which is more favorable for plasma heating than the familiar n/sub e/−1 scaling.
Fusion Energy Update
Author:
Publisher:
ISBN:
Category : Controlled fusion
Languages : en
Pages : 100
Book Description
Publisher:
ISBN:
Category : Controlled fusion
Languages : en
Pages : 100
Book Description
Experimental Investigation on Electron Cyclotron Absorption at Down-shifted Frequency in the PLT Tokamak
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
The absorption of 60 GHz electron cyclotron waves, with the extraordinary mode and an oblique angle of propagation, has been investigated in the PLT tokamak in the regime of down-shifted frequencies. The production of energetic electrons, with energies of up to 300 to 400 keV, peaks at values of toroidal field (approx. =29 kG) for which the wave frequency is significantly smaller than the electron cyclotron frequency in the whole plasma region. The observations are consistent with the predictions of the relativistic theory of electron cyclotron damping at down-shifted frequency. Existing rf sources make this process a viable method for assisting the current ramp-up, and for heating the plasma of present large tokamaks.
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
The absorption of 60 GHz electron cyclotron waves, with the extraordinary mode and an oblique angle of propagation, has been investigated in the PLT tokamak in the regime of down-shifted frequencies. The production of energetic electrons, with energies of up to 300 to 400 keV, peaks at values of toroidal field (approx. =29 kG) for which the wave frequency is significantly smaller than the electron cyclotron frequency in the whole plasma region. The observations are consistent with the predictions of the relativistic theory of electron cyclotron damping at down-shifted frequency. Existing rf sources make this process a viable method for assisting the current ramp-up, and for heating the plasma of present large tokamaks.
ERDA Energy Research Abstracts
Author:
Publisher:
ISBN:
Category : Power resources
Languages : en
Pages : 676
Book Description
Publisher:
ISBN:
Category : Power resources
Languages : en
Pages : 676
Book Description
Electron Cyclotron Heating at Down-shifted Frequencies in PLT and TFTR.
Author: E. Mazzucato
Publisher:
ISBN:
Category :
Languages : en
Pages : 7
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 7
Book Description
Energy Research Abstracts
Author:
Publisher:
ISBN:
Category : Power resources
Languages : en
Pages : 664
Book Description
Publisher:
ISBN:
Category : Power resources
Languages : en
Pages : 664
Book Description
Energy Research Abstracts
Author:
Publisher:
ISBN:
Category : Power resources
Languages : en
Pages : 564
Book Description
Includes all works deriving from DOE, other related government-sponsored information and foreign nonnuclear information.
Publisher:
ISBN:
Category : Power resources
Languages : en
Pages : 564
Book Description
Includes all works deriving from DOE, other related government-sponsored information and foreign nonnuclear information.
Electron Bernstein Wave Heating and Emission in Spherical Tokamaks
Author: Abhay Ram
Publisher:
ISBN:
Category :
Languages : en
Pages : 8
Book Description
The high beta operating regime of spherical tokamaks (ST), such as in NSTX and MAST, make them attractive fusion devices. To attain the high beta's there is a need to heat and to drive currents in ST plasmas. While ST plasmas are overdense to conventional electron cyclotron (EC) waves, electron Bernstein waves (EBW) offer an attractive possibility both for heating and for driving plasma currents. EBWs, which have no density limits, can propagate into the plasma core for frequencies above the electron cyclotron frequency fce [A.K. Ram and S.D. Schultz, Phys. Plasmas, 7, 4084 (2000)]. Since EBWs are not vacuum modes, they are excited inside the plasma by mode conversion of the traditional X and O modes. From ray tracing analysis we find that EBWs are strongly absorbed by electrons in the region where the wave frequency matches the Doppler broadened electron cyclotron resonance frequency or its harmonics [A.K. Ram and S.D. Schultz, Phys. Plasmas, 7, 4084 (2000)]. The strong and localized absorption implies that thermal emission of EBWs can occur for frequencies corresponding to the local Doppler-shifted electron cyclotron frequency. This emission then converts, at the UHR, to the X and O modes which are then observed in the vacuum region.
Publisher:
ISBN:
Category :
Languages : en
Pages : 8
Book Description
The high beta operating regime of spherical tokamaks (ST), such as in NSTX and MAST, make them attractive fusion devices. To attain the high beta's there is a need to heat and to drive currents in ST plasmas. While ST plasmas are overdense to conventional electron cyclotron (EC) waves, electron Bernstein waves (EBW) offer an attractive possibility both for heating and for driving plasma currents. EBWs, which have no density limits, can propagate into the plasma core for frequencies above the electron cyclotron frequency fce [A.K. Ram and S.D. Schultz, Phys. Plasmas, 7, 4084 (2000)]. Since EBWs are not vacuum modes, they are excited inside the plasma by mode conversion of the traditional X and O modes. From ray tracing analysis we find that EBWs are strongly absorbed by electrons in the region where the wave frequency matches the Doppler broadened electron cyclotron resonance frequency or its harmonics [A.K. Ram and S.D. Schultz, Phys. Plasmas, 7, 4084 (2000)]. The strong and localized absorption implies that thermal emission of EBWs can occur for frequencies corresponding to the local Doppler-shifted electron cyclotron frequency. This emission then converts, at the UHR, to the X and O modes which are then observed in the vacuum region.