Beam deflection phenomena in a Pulselac post-acceleration gap

Journal Article · Thu Jan 01 04:00:00 EST 1987 · J. Appl. Phys.; (United States)

DOI:https://doi.org/10.1063/1.338858· OSTI ID:6942372

Johnson, D J; Lockner, T R

The post-acceleration of a 400-keV, 10-kA proton beam by a 200-kV magnetically insulated gap is investigated. The defections from self- and applied E and B fields are measured and compared to calculated values. Several important principles of post-acceleration gap operation are observed for the first time that are important for multigap operation. First, the beam is inadequately space-charge neutralized without gas puffs or preformed plasma in regions of transverse applied-B field to allow efficient transport. The beam is also noncurrent neutralized in these regions. Second, the applied-B field defines equipotential surfaces in the gap allowing the voltage on the gap to steer and focus the beam, and it has an axial field component that acts like a pair of solenoidal lenses to focus the beam. It is also pointed out how azimuthal asymmetries in the beam current density and cathode plasma cause beam self-field asymmetries that lead to growth of beam emittance. Finally, we discuss a model which can be used to extrapolate the experimental results to multigap operation.

• Research Organization: Sandia National Laboratories, Albuquerque, New Mexico 87185
• DOE Contract Number: AC04-76DP00789
• OSTI ID: 6942372
• Journal Information: J. Appl. Phys.; (United States), Journal Name: J. Appl. Phys.; (United States) Vol. 61:1; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
430200* -- Particle Accelerators-- Beam Dynamics
Field Calculations
& Ion Optics
ACCELERATION
ACCELERATORS
BEAM DYNAMICS
BEAM OPTICS
BEAMS
ENERGY RANGE
FOCUSING
KEV RANGE
KEV RANGE 100-1000
MAGNETIC FIELDS
NUCLEON BEAMS
OPERATION
PARTICLE BEAMS
PROTON BEAMS