Generation and propagation of high-brightness electron beams from a magnetically crowbarred injector

Journal Article · Fri May 01 04:00:00 EDT 1987 · Rev. Sci. Instrum.; (United States)

DOI:https://doi.org/10.1063/1.1139635· OSTI ID:6685017

Jr, Humphries S; Len, L K; Allen, C B

Tests of a 300-keV electrostatic electron beam injector with a magnetic crowbar switch are described. The saturable ferrite core switch allows generation of a constant voltage, 80-ns pulse directly from a Marx generator. Inductive isolation in the switch permits direct access to the high-voltage electrode for thermionic or active plasma cathode experiments. The pulse modulator can drive a 1.5-kA load. A high brightness 290-A beam from a felt plasma-emission cathode was extracted and propagated in vacuum. Because of the reliability of the magnetic crowbar switch, more than 500 shots were accumulated on the cathode at over 1 kA/cm/sup 2/ with no degradation of the output. The output beam had a normalized brightness of 2.6 x 10/sup 8/ A/(m rad)/sup 2/. A solenoidal lens was used to match the space-charge-dominated beam into a 1-m-long periodic focusing system with 25 reversing solenoidal coils. A beam current of 150 A was successfully transported through the 1.7-cm radius tube.

• Research Organization: Institute for Accelerator and Plasma Beam Technology, University of New Mexico, Albuquerque, New Mexico 87131
• OSTI ID: 6685017
• Journal Information: Rev. Sci. Instrum.; (United States), Journal Name: Rev. Sci. Instrum.; (United States) Vol. 58:5; ISSN RSINA
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700101 -- Fusion Energy-- Plasma Research-- Confinement
Heating
& Production
700205* -- Fusion Power Plant Technology-- Fuel
Heating
& Injection Systems
ACCELERATORS
BEAM EMITTANCE
BEAM EXTRACTION
BEAM INJECTION
BEAM INJECTION HEATING
BEAM-PLASMA SYSTEMS
BEAMS
COLLECTIVE ACCELERATORS
DESIGN
ELECTRICAL EQUIPMENT
ELECTRON BEAM INJECTION
ELECTRON BEAMS
ELECTRON GUNS
ELECTRONIC EQUIPMENT
ELECTROSTATICS
EQUIPMENT
HEATING
LEPTON BEAMS
MAGNETIC MATERIALS
MARX GENERATORS
MATERIALS
OPERATION
PARTICLE BEAMS
PLASMA BETATRONS
PLASMA HEATING
POWER SUPPLIES
POWER TRANSMISSION LINES
SPACE CHARGE
SPARK GAPS
SWITCHES