High magnetic field, large-volume magnetic multipole ion source producing hydrogen ion beams with high proton ratio

Journal Article · Sun Jan 01 04:00:00 EST 1984 · Rev. Sci. Instrum.; (United States)

DOI:https://doi.org/10.1063/1.1137577· OSTI ID:5511942

Okumura, Y; Horiike, H; Mizuhashi, K

In order to enhance the proton fraction in hydrogen ion beams, a high magnetic field, large-volume magnetic multipole ion source has been designed and tested. The plasma source is made of a water-cooled rectangular copper chamber, which is surrounded by a set of mild steel strips and samarium--cobalt magnets arranged in a continuous line-cusp geometry. The magnetic field at the inner wall surface is 2.7 kG. This strong magnetic field enables us to enlarge the chamber volume without increasing the ion loss area. Large plasma volume and small ion loss area increase the ion confinement time and enhance the proton yield. The proton fraction in the beams, as measured by both a magnetic momentum mass analyzer and a optical spectrometer, is found to be more than 90% at an ion beam current of 28 A ( j = 250 mA/cm/sup 2/). This source is also operated with a weak magnetic field (approx.0.6 kG) by replacing the samarium--cobalt magnets with AlNiCo magnet, in which case the proton fraction decreases to 80%. These experimental values are in good agreement with the values predicted by a simple scaling equation of the proton ratio on the plasma volume and the ion loss area.

• Research Organization: Division of Thermonuclear Fusion Research, Japan Atomic Energy Research Institute, Tokai-mura, Naka-gun, Ibaraki-ken, Japan
• OSTI ID: 5511942
• Journal Information: Rev. Sci. Instrum.; (United States), Journal Name: Rev. Sci. Instrum.; (United States) Vol. 55:1; ISSN RSINA
• Country of Publication: United States
• Language: English

Related Subjects

640301* -- Atomic
Molecular & Chemical Physics-- Beams & their Reactions
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BARYONS
BEAM BENDING MAGNETS
BEAM PRODUCTION
BEAMS
CATIONS
CHARGED PARTICLES
DESIGN
ELECTRICAL EQUIPMENT
ELECTROMAGNETS
ELEMENTARY PARTICLES
EQUIPMENT
FERMIONS
HADRONS
HYDROGEN IONS
HYDROGEN IONS 1 PLUS
ION BEAMS
ION SOURCES
IONIC COMPOSITION
IONS
MAGNETIC FIELDS
MAGNETS
NUCLEON BEAMS
NUCLEONS
PARTICLE BEAMS
PERFORMANCE TESTING
PLASMA
PROTON BEAMS
PROTONS
TESTING