Determination of Electron Energy Distribution Functions in ECR Discharges

Electron energy distribution functions of an ECR discharge confined in a simple magnetic mirror trap have been measured.The double retarding field analysis can determine the electron distribution functions in the loss cone.By the spectroscopic variation principle and Langmuir probe measurements,some parameters of the electron distribution functions are determined.The discharge is run in Ar 2.In the experiments,for different distribution functions like power laws and exponentifl functions are found.