Production of intense light ion beams from a superpower generator

Technical Report · Fri Jan 15 04:00:00 EST 1982

OSTI ID:5559209

Young, F C; Cooperstein, G; Goldstein, S A; Mosher, D; Stephanakis, S J; Oliphant, W F; Boller, J R; Maenchen, J; Genuario, R D; Stringfield, R N

The operation of a pinch-reflex diode as an intense pulsed ion-beam source has been scaled up to the multiterawatt PITHON generator. Ion beams with currents of 1 MA at 1.8 MeV have been extracted in a 130 kJ, 100-ns (FWHM) pulse. The corresponding ion production efficiency is 60%. Power losses were observed in interfacing the coaxial diode to the biconic vacuum feed of the generator. By using smaller area diodes, the average current density at the anode source has been increased to 20 kA/cm/sup 2/. Proton and deuteron beams were studied in both planar and spherical diode geometries. The focusing of ion beams is predominately by self-magnetic fields for planar diodes and predominately by electrode shaping for spherical diodes. Current densities of at least 150 kA/cm/sup 2/ were achieved with spherical diodes. The spatial evolution of the anode and cathode plasmas was studied by laser interferometric holography. As the peak of the power pulse is approached, plasmas were observed to expand from the electrodes in fairly uniform profiles with steep density gradients and to accelerate across the vacuum gap. After peak power, anode plasma fluctuations and a high velocity (30 cm/..mu..s) axial plume develop; the latter expands radially coincident with collapse of the power pulse.

• Research Organization: Naval Research Lab., Washington, DC (USA)
• OSTI ID: 5559209
• Report Number(s): NRL-MR-4726; ON: DE82902270
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700208* -- Fusion Power Plant Technology-- Inertial Confinement Technology
BEAMS
CONFIGURATION
CURRENT DENSITY
EFFICIENCY
ELECTRODES
ELECTROMAGNETIC RADIATION
HOLOGRAPHY
ION BEAMS
ION SOURCES
LASER RADIATION
RADIATIONS
SPHERICAL CONFIGURATION