Large probes in tokamak scrape-off plasmas. Analytic model for the collisionless scrape-off plasma
- 1 February 1985
- journal article
- research article
- Published by AIP Publishing in Physics of Fluids
- Vol. 28 (2) , 644-651
- https://doi.org/10.1063/1.865077
Abstract
When large probes are used to measure plasma properties in tokamak scrape‐off layers, the presence of the probe influences the plasma being measured. A theory is presented for probe interpretation which makes it possible to infer undisturbed values of Te, Ti, ne, etc. The first requirement in such an analysis is for analytic models of the scrape‐off layer, which can then be modified to allow for the presence of the probe. The present work gives such a model for the collisionless scrape‐off layer, and criteria are stated governing its applicability. Such models may be of use for other applications, e.g., predictions of power loading to limiter surfaces, the magnitude of wall sputtering, etc.Keywords
This publication has 23 references indexed in Scilit:
- Modelling of the ASDEX scrape-off and divertorJournal of Nuclear Materials, 1984
- Scrape-off layers in which ionisation is importantJournal of Nuclear Materials, 1984
- DITE Langmuir probe results showing probe-size and limiter-shadow effectsJournal of Vacuum Science & Technology A, 1984
- Radiation losses and global energy balance for Ohmically heated discharges in ASDEXNuclear Fusion, 1982
- Thermal desorption measurements of hydrogen–isotope retention in the Alcator-A tokamakJournal of Vacuum Science and Technology, 1980
- Effects of metal impurity re-cycling in the scrape-off plasma of a large tokamakNuclear Fusion, 1979
- Simulation of poloidal divertors in one-dimensional tokamak transport codesNuclear Fusion, 1979
- Heat flux to the material surfaces in a tokamakNuclear Fusion, 1978
- A novel technique for measurement of energetic hydrogen flux to the walls in fusion devicesJournal of Physics D: Applied Physics, 1978
- Steady-state radiative cooling rates for low-density, high-temperature plasmasAtomic Data and Nuclear Data Tables, 1977