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Investigation of in-resonator gas breakdown for electron cyclotron resonance conditions

An investigation of in-resonator gas breakdown for electron cyclotron resonance condition was performed for various magnetic field configurations, gas pressures and compositions. The dependence of the threshold power of breakdown on the magnetic field value has more than one minimum. One of the minima corresponds to the case when the ECR condition takes place in the centre of the resonator (microwave (MW) electric field is maximal). The other minima correspond to the position of the ECR zone near the resonator edges (MW electric field is rather small). This is valid if the magnetic field configuration inside the resonator is a magnetic mirror. The presence of the edge minimum may be explained by the increase of maximal energy which the electron can attain during stochastic heating. This compensates the decrease of MW electric field near the resonator edges.