Cusp width and power flow study at a high power magnetic multipole ion source

Journal Article · Thu Oct 01 04:00:00 EDT 1987 · Phys. Fluids; (United States)

DOI:https://doi.org/10.1063/1.866503· OSTI ID:5914398

Horiike, H; Akiba, M; Ohara, Y; Okumura, Y; Tanaka, S

Power flow of the arc discharge on a high power magnetic multipole ion source is studied experimentally. Power flux distribution across line cusps is obtained using a probe made of a thermocouple. This confirms the fact that the full-width leakage is almost twice the size of the ion Larmor radius. It is shown that the arc discharge had strong spatial distribution in the arc chamber. The absolute value of the power flux is determined by comparing the integrated values of the distribution with heat loading measured by the coolant temperature rise. The result revealed that a very high power flux of more than 500 W/cm/sup 2/ is concentrated on the anode wall at the line cusp position for a moderate arc discharge condition. It is also shown that a large portion of arc power is carried by the neutral particles. The composition of the source plasma near the grid is estimated from the power flux on the extraction grid.

• Research Organization: Plasma Heating Laboratory I, Division of Thermonuclear Fusion Research, Japan Atomic Energy Research Institute, 801 Mukoh-yama, Naka-machi, Naka-gun, Ibaraki 311-02, Japan
• OSTI ID: 5914398
• Journal Information: Phys. Fluids; (United States), Journal Name: Phys. Fluids; (United States) Vol. 30:10; ISSN PFLDA
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700101* -- Fusion Energy-- Plasma Research-- Confinement
Heating
& Production
ADIABATIC PROCESSES
CONFINEMENT
CURRENTS
CUSPED GEOMETRIES
ELECTRIC ARCS
ELECTRIC CURRENTS
ELECTRIC DISCHARGES
ENERGY BALANCE
ENERGY LOSSES
HIGH-BETA PLASMA
ION SOURCES
LARMOR RADIUS
LOSSES
MAGNETIC FIELD CONFIGURATIONS
MEASURING INSTRUMENTS
MULTIPOLES
OPEN CONFIGURATIONS
PLASMA
PLASMA CONFINEMENT
THERMOCOUPLES