Temperature and anisotropic‐temperature relaxation measurements in cold, pure‐electron plasmas
| Autor: | B. R. Beck, J. H. Malmberg, Joel Fajans |
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| Rok vydání: | 1996 |
| Předmět: | |
| Zdroj: | Physics of Plasmas. 3:1250-1258 |
| ISSN: | 1089-7674 1070-664X |
| DOI: | 10.1063/1.871749 |
| Popis: | Plasma temperatures in the range 25 to 2×106 K have been measured using a cryogenic, ultra‐high vacuum, pure‐electron plasma trap. The rate ν at which the temperatures parallel and perpendicular to the applied magnetic field relax to a common value has been measured over the temperature range 28 to 3.8×105 K and the magnetic field range 20 to 60 kG. This rate ν is closely related to the plasma collision frequency. When the cyclotron radius rc is large compared to the classical distance of closest approach b (rc/b≫1), the measured values of ν are in agreement with conventional collision theory. When the cyclotron radius is small compared to the classical distance of closest approach (rc/b≪1), ν drops precipitously as rc/b is decreased, in agreement with the many‐electron adiabatic invariant theory of O’Neil and Hjorth. |
| Databáze: | OpenAIRE |
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