Intense ion beam from a magnetically insulated diode with an active anode source

Thesis/Dissertation · Wed Jan 01 04:00:00 EST 1986

OSTI ID:6708688

Ueda, M

A magnetically insulated diode using an active anode plasma ion source was developed and thoroughly characterized. In this extraction geometry ion diode, an anode plasma of annular shape and 30 cm diameter is formed independently of the injector voltage pulse. The anode plasma is produced by inductive voltage breakdown of a radially expanding gas cloud supplied by a fast puff valve. This diode was driven by the low voltage (<200 kV), long pulse (>1 ..mu..s) LONGSHOT II generator. It was capable of producing prompt ion current turn-on, long pulse (1 ..mu..s), high current density (>100 A/cm/sub 2/) proton beam output at 70-150 keV when using hydrogen gas. Other characteristics of this diode include: extraction of a pure proton beam within the 20% measurement uncertainty; diode voltage pulse shape (flat, decreasing or increasing in time) and pulse length control by injection of the anode plasmas with differing density and/or timing; capable of flat or increasing impedances; an effective gap closure velocity of <2 mm/..mu..s during the main power pulse; low neutral to plasma density ratio at the gap; up to 5 J/cm/sup 2/ energy density deposited over a beam extraction area of 300 cm/sup 2/; more than 1 x 10/sup 17/ particles per pulse with >60 keV; global beam uniformity better than +/-35% (10% on a 1 cm length scale); ion current efficiency of at least 40%; and typical divergence of <3/sup 0/ half angle.

• Research Organization: Cornell Univ., Ithaca, NY (USA)
• OSTI ID: 6708688
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420800 -- Engineering-- Electronic Circuits &amp; Devices-- (-1989)
43 PARTICLE ACCELERATORS
430301* -- Particle Accelerators-- Ion Sources
BEAM PULSERS
BEAMS
CURRENT DENSITY
ELECTRON TUBES
ELECTRONIC CIRCUITS
ION BEAMS
NUCLEON BEAMS
PARTICLE BEAMS
PLASMATRONS
PRODUCTION
PROTON BEAMS
PULSE CIRCUITS
PULSE SHAPERS
SIGNAL CONDITIONERS