TFTR prototype electrostatic-calorimeter probe head

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

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


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 =5 kW/cm2 for = 10 ms or 1 kW/cm2 for 500 ms and provides 5–10 ms time resolution of heat flux. This allows simultaneous estimation of time-resolved radial profiles of ne Te and Ti. 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.

Original languageEnglish (US)
Pages (from-to)845-848
Number of pages4
JournalJournal of Vacuum Science and Technology A: Vacuum, Surfaces and Films
Issue number2
StatePublished - Apr 1 1983

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films


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