Superthermal Electron Distribution Measurements from Polarized Electron Cyclotron Emission PDF Download
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Languages : en
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Measurements of the superthermal electron distribution can be made by observing the polarized electron cyclotron emission. The emission is viewed along a constant magnetic field surface. This simplifies the resonance condition and gives a direct correlation between emission frequency and kinetic energy of the emitting electron. A transformation technique is formulated which determines the anisotropy of the distribution and number density of superthermals at each energy measured. The steady-state distribution during lower hybrid current drive and examples of the superthermal dynamics as the runaway conditions is varied are presented for discharges in the PLT tokamak. 15 refs., 8 figs.
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Languages : en
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Book Description
Measurements of the superthermal electron distribution can be made by observing the polarized electron cyclotron emission. The emission is viewed along a constant magnetic field surface. This simplifies the resonance condition and gives a direct correlation between emission frequency and kinetic energy of the emitting electron. A transformation technique is formulated which determines the anisotropy of the distribution and number density of superthermals at each energy measured. The steady-state distribution during lower hybrid current drive and examples of the superthermal dynamics as the runaway conditions is varied are presented for discharges in the PLT tokamak. 15 refs., 8 figs.
Author: P. C. Efthimion
Publisher:
ISBN:
Category : Cyclotron resonance
Languages : en
Pages : 22
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Author: Timothy Charles Luce
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Category :
Languages : en
Pages : 214
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Author: Sherrie Anne Preische
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Category : Imaging systems
Languages : en
Pages : 19
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Author:
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ISBN:
Category : Power resources
Languages : en
Pages : 782
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Author: Sherrie Anne Preische
Publisher:
ISBN:
Category : Imaging systems
Languages : en
Pages : 19
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Author: V. Tribaldos
Publisher:
ISBN: 9788478341832
Category :
Languages : en
Pages : 19
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Category :
Languages : en
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During first harmonic electron cyclotron heating (ECH) on the Princeton Divertor Experiment (PDX) (R0 = 137 cm, a = 40 cm), electron temperature was monitored using a grating polychromator which measured second harmonic electron cyclotron emission from the low field side of the tokamak. Interference from the high power heating pulse on the broadband detectors in the grating instrument was eliminated by using a waveguide filter in the transmission line which brought the emission signal to the grating instrument. Off-axis (approx. 4 cm) location of the resonance zone resulted in heating without sawtooth or m = 1 activity. However, heating with the resonance zone at the plasma center caused very large amplitude sawteeth accompanied by strong m = 1 activity: .delta. T/T/sub MAX/ approx. = 0.41, sawtooth period approx. = 4 msec, m = 1 period approx. = 90 .mu. sec, (11 kHz). This is the first time such intense MHD activity driven by ECH has been observed. (For both cases there was no sawtooth activity in the ohmic phase of the discharge before ECH.) At very low densities there is a clear indication that a superthermal electron population is created during ECH.
Author: John Lohr
Publisher: World Scientific
ISBN: 9812814647
Category : Science
Languages : en
Pages : 583
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Book Description
These proceedings present the latest results in electron cyclotron emission, heating and current drive, with an emphasis on the physics and technology of Electron Cyclotron Emission, Electron Cyclotron Heating and Electron Cyclotron Current Drive applied to magnetic fusion research. The field is a key element in the development of fusion power and the ITER project now under construction.
Author: John Lohr
Publisher: World Scientific
ISBN: 9814470996
Category : Science
Languages : en
Pages : 583
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Book Description
These proceedings present the latest results in electron cyclotron emission, heating and current drive, with an emphasis on the physics and technology of Electron Cyclotron Emission, Electron Cyclotron Heating and Electron Cyclotron Current Drive applied to magnetic fusion research. The field is a key element in the development of fusion power and the ITER project now under construction.
