Author: Alfred Joseph CavalloPublisher:
ISBN:
Category :
Languages : en
Pages : 436
Book Description
Plasma Loss in the Levitated Toroidal Octupole
Author: Alfred Joseph CavalloPublisher:
ISBN:
Category :
Languages : en
Pages : 436
Book Description
Plasma Containment in a Toroidal Octupole
Author: Arthur Warren MolvikPublisher:
ISBN:
Category :
Languages : en
Pages : 376
Book Description
Plasma Heating and Losses in Toroidal Multipole Fields
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 14
Book Description
The heating and loss of plasmas have been studied in three pulsed, toroidal multipole devices: a large levitated octupole, a small supported octupole and a very .small supported quadrupole. Plasmas are produced by gun injection and heated by electron and ion cyclotron resonance heating and ohmic heating. Electron cyclotron heating rates have been measured over a wide range of parameters, and the results are in quantitative agreement with stochastic heating theory. Electron cyclotron resonance heating produces ions with energies larger than predicted by theory. With the addition of a toroidal field, ohmic heating gives densities as high as 1013cm−3 in the toroidal quadrupole and 1012cm−3 in the small octupole. Plasma losses for n=5 x 109cm−3 plasmas are inferred from Langmuir probe and Fabry-Perot interferometer measurements, and measured with special striped collectors on the wall and rings. The loss to a levitated ring is measured using a modulated light beam telemeter. The confinement is better than Bohm but considerably worse than classical. Low frequency convective cells which are fixed in space are observed. These cells around the ring are diminished when a weak toroidal field is added, and loss collectors show a vastly reduced flux to the rings. Analysis of the spatial density profile shows features of B-independent diffusion. The confinement is sensitive to some kinds of dc field errors, but surprisingly insensitive to perturbations of the ac confining field.
Observations of Plasma Density and Potential Structure in a Toroidal Octupole Magnetic Field
Author: James Robert DrakeAmbipolar Electric Fields and Turbulence Studies in the Wisconsin Levitated Toroidal Octupole
Author: Charles Jesse ArmentroutPublisher:
ISBN:
Category : Electromagnetic fields
Languages : en
Pages : 408
Book Description
Ambipolar Electric Fields and Turbulence Studies in the Wisconsin Levitated Toroidal Octupole
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Detailed studies of hot ion plasmas (T/sub i/> T/sub e/) in the poloidal field octupole show that the ambipolar electric field which is perpendicular to the flux surfaces is well explained by the observed properties of the microturbulence structures in the plasma. The turbulence structure has been measured by correlation techniques which are carefully described. In these experiments, signals were studied which are aperiodic in time and space, short lived compared to the decay times of the bulk plasma parameters, short ranged compared to the machine size, and are therefore classified as microturbulence structures. The resulting spatial and temporal correlation functions (CFs) are well fitted to a Gaussian function and the associated correlation lengths or times are the half width at half maximum of the CFs. The correlation length is measured to be the ion gyro radius for the hot hydrogen plasma and somewhat less for the helium plasma.
Nuclear Science Abstracts
Author: ERDA Energy Research Abstracts
Author: United States. Energy Research and Development AdministrationPublisher:
ISBN:
Category : Medicine
Languages : en
Pages : 756
Book Description
ERDA Research Abstracts
Author: United States. Energy Research and Development AdministrationPublisher:
ISBN:
Category : Power resources
Languages : en
Pages : 780
Book Description
Author: