TFTR prototype electrostatic-calorimeter probe head

Journal Article · Fri Apr 01 04:00:00 EST 1983 · J. Vac. Sci. Technol., A; (United States)

DOI:https://doi.org/10.1116/1.572008· OSTI ID:5724121

Manos, D M; Budny, R V; Cohen, S A

Power loading of the limiters in TFTR is a major concern because of problems of impurity generation and thermal stresses. To diagnose this edge plasma we have prepared a prototype electrostatic-calorimeter probe and tested it on the PDX and PLT tokamaks. The probe provides time-resolved measurements of heat flux Q and Langmuir (I--V) characteristics on each of its opposing active elements. The present design, employing carbon shields and tantalum elements, is able to withstand roughly-equal5 kW/cm/sup 2/ for roughly-equal10 ms or 1 kW/cm/sup 2/ for 500 ms and provides 5--10 ms time resolution of heat flux. This allows simultaneous estimation of time-resolved radial profiles of n/sub e/, T/sub e/, and T/sub i/. By fitting the probe with narrow slit apertures and rotating the probe head, the device provides discrimination between particles having different values of Larmor radius and/or ratios of perpendicular to parallel velocities. Calculations required to interpret the results of probe head rotation are also discussed. This information is of interest in the study of fast ion losses during neutral beam, ICRF, and LH auxiliary heating.

• Research Organization: Plasma Physics Laboratory, Princeton University, Princeton, New Jersey 08544
• OSTI ID: 5724121
• Journal Information: J. Vac. Sci. Technol., A; (United States), Journal Name: J. Vac. Sci. Technol., A; (United States) Vol. 1:2; ISSN JVTAD
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700102* -- Fusion Energy-- Plasma Research-- Diagnostics
BEAM INJECTION HEATING
CALORIMETERS
CALORIMETRY
CARBON
DESIGN
DIVERTORS
ELECTRIC PROBES
ELECTRON DENSITY
ELECTRON TEMPERATURE
ELEMENTS
FABRICATION
HEAT FLUX
HEATING
HIGH-FREQUENCY HEATING
ICR HEATING
IMPURITIES
ION TEMPERATURE
LANGMUIR PROBE
LARMOR RADIUS
MEASURING INSTRUMENTS
METALS
NONMETALS
PDX DEVICES
PLASMA DIAGNOSTICS
PLASMA HEATING
PLT DEVICES
PROBES
TANTALUM
THERMONUCLEAR REACTORS
TOKAMAK TYPE REACTORS
TRANSITION ELEMENTS