Charge-exchange neutral hydrogen measurements in TFTR using Pd-MOS microsensors

Conference · Sat Jun 01 04:00:00 EDT 1991

OSTI ID:5618604

Bastasz, R ^[1]; Kilpatrick, S J ^[2]; Ruzic, D N ^[3]

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1. Sandia National Labs., Livermore, CA (USA)
2. Princeton Univ., NJ (USA). Plasma Physics Lab.
3. Illinois Univ., Urbana, IL (USA). Dept. of Nuclear Engineering

An array of Pd-metal-oxide semiconductor (Pd-MOS) diodes has been used to monitor the fluence and energy of charge-exchange neutral hydrogen isotopes striking the wall of the Tokamak Fusion Test Reactor (TFTR). The array was positioned 4 cm behind the graphite-tiled wall at the toroidal midplane and exposed to several hundred plasma discharges. Hydrogen isotopes striking the Pd-MOS diodes were detected by measuring the leakage current, which is affected by the presence of these species at the Pd/SiO{sub 2} interface. It was found that the midplane flux strongly increased for neutral-beam heated plasmas and correlated with co-injected neutral beam power. The majority of the neutral flux was {lt}50 eV in energy but its energy distribution extended to above 500 eV. 20 refs., 4 figs.

• Research Organization: Princeton Univ., NJ (USA). Plasma Physics Lab.
• Sponsoring Organization: DOE; USDOE, Washington, DC (USA)
• DOE Contract Number: AC02-76CH03073
• OSTI ID: 5618604
• Report Number(s): PPPL-2746; CONF-9005324--1; ON: DE91013455
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700102* -- Fusion Energy-- Plasma Research-- Diagnostics
700201 -- Fusion Power Plant Technology-- Blanket Engineering
BEAM INJECTION HEATING
CARBON
CHARGE EXCHANGE
CURRENTS
ELECTRIC CURRENTS
ELEMENTAL MINERALS
ELEMENTS
FIRST WALL
GRAPHITE
HEATING
HYDROGEN ISOTOPES
ISOTOPES
LEAKAGE CURRENT
MEASURING INSTRUMENTS
MEASURING METHODS
MINERALS
MOS TRANSISTORS
NONMETALS
PLASMA DIAGNOSTICS
PLASMA HEATING
SEMICONDUCTOR DEVICES
TFTR TOKAMAK
THERMONUCLEAR REACTOR WALLS
THERMONUCLEAR REACTORS
TOKAMAK TYPE REACTORS
TRANSISTORS