Experimental investigation of fast-ion confinement on the ISX B tokamak

Thesis/Dissertation · Tue Jan 01 04:00:00 EST 1985

OSTI ID:5877915

Carnevali, A

An experimental investigation of fast ion confinement was conducted on the ISX-B tokamak at the Oak Ridge National Laboratory to ascertain that the beam ion behavior is properly described by classical processes. Data were collected during tangential injection of H/sup 0/ beams (co-, counter-, and co-plus counter-) at power levels up to 1.9 MW in low plasma current (T/sub p/ = 80 to 215 kA) D/sup +/ discharges. Experimental energy spectra of energetic charge-exchange neutrals along several sightlines in the torus equatorial plane are compared with the predictions of Fokker-Planck and orbit-following Monte Carlo calculations to verify the validity of classical theory. A further tool used in this investigation is the comparison of predicted and experimental beam-plasma neutron emission during injection of beams doped with 3% D/sup 0/. Both the fast-neutral spectra and the beam-plasma neutron emission are in close agreement (within factors of <2) with the calculated values under a variety of plasma parameters, beam parameters, and injection geometries. Furthermore, measured decay rates of the beam-plasma neutron production following beam turn-off show that the beam slowing down - at energies close to the injection energy and in the plasma core - is classical within a 30% uncertainty. These results demonstrate that classical theory describes well the behavior of the beam ions.

• Research Organization: Tennessee Univ., Knoxville (USA)
• OSTI ID: 5877915
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700101* -- Fusion Energy-- Plasma Research-- Confinement
Heating
&amp; Production
BEAM INJECTION
BEAM-PLASMA SYSTEMS
BEAMS
CHARGE EXCHANGE
CHARGED PARTICLES
CONFINEMENT
DEUTERIUM IONS
EMISSION
ENERGY SPECTRA
ION BEAMS
IONS
ISX TOKAMAK
NEUTRAL ATOM BEAM INJECTION
NEUTRON EMISSION
SPECTRA
THERMONUCLEAR REACTORS
TOKAMAK TYPE REACTORS