Studies of an extractor geometry magnetically insulated ion diode with an exploding metal film anode plasma
Magnetically insulated diodes (MIDs) are of interest as ion sources for inertial confinement fusion. The authors examined several issues that are of concern with MIDs, including ion turn-on delay and anode plasma production, and diode impedance history and particle current scaling with the applied magnetic field and gas spacing. The LION pulsed power generator (1.5 MV, 4 {Omega}, 40 ns pulse length) was used to power an extractor geometry magnetically insulated (radical magnetic field) ion beam diode. The diode was studied with three anode configurations. In the first, with epoxy-filled-groove (epoxy) anodes, scaling of the ion and electron currents with the gap and the magnetic field was examined. He found that the observed ion current is consistent with a diode model that has been successful with barrel geometry MIDs. The electron leakage current scaled proportionally to 1/Bd{sup 2}, where d is the anode-cathode gap spacing and B is the magnetic field strength. Studies of ion beam propagation in vacuum showed that space charge non-neutrality near the magnetic field coils caused the beam to expand initially. Later in the ion pulse (20 to 30 ns), the beam expansion became much less severe. The second anode configuration utilized an electron collector protruding above an epoxy anode surface. With the collector, he observed less bremsstrahlung across the active anode region. The last anode configuration studied was the exploding metal film active anode plasma source (EMFAAPS). Current from the accelerator was directed by an electron collector or a plasma opening switch through a thin aluminum film, which exploded to form the anode plasma.
- Research Organization:
- Cornell Univ., Ithaca, NY (USA)
- OSTI ID:
- 6094280
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
700208* -- Fusion Power Plant Technology-- Inertial Confinement Technology
ACCELERATORS
ALUMINIUM IONS
ANODES
BARYONS
BEAMS
BREMSSTRAHLUNG
CATIONS
CHARGED PARTICLES
CONFINEMENT
CURRENTS
DESIGN
ELECTRIC CURRENTS
ELECTRODES
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
EXPLODING WIRES
FERMIONS
GEOMETRY
HADRONS
ICF DEVICES
INERTIAL CONFINEMENT
ION BEAMS
ION SOURCES
IONIC COMPOSITION
IONS
LEAKAGE CURRENT
MAGNETIC FIELDS
MATHEMATICS
NUCLEONS
PLASMA CONFINEMENT
PLASMA PRODUCTION
POWER GENERATION
PROTONS
RADIATIONS
THERMONUCLEAR DEVICES
WIRES