U-3M discharge start-up scenario with the use of pulsed gas puffing Sample Clauses

U-3M discharge start-up scenario with the use of pulsed gas puffing. In order to reduce flux of the neutrals, U-3M discharge start-up scenario maintained by impulse gas puffing has been proposed. Absence of constant working gas feeding in this scenario open a possibility to reduce working gas pressure in the U-3M vacuum vessel. It was shown that the time of entire vessel filling after sharp gas puffing pulse is about 10-20 ms. In discharges with 5-6 kV in the RF generators and proposed start-up scenario a delay between GP pulse and plasma creation was shorter when the chamber filling time. Same level of the electron density has been achieved in the discharge under consideration and conventional 5-6 kV discharge maintained by the constant gas feeding only. The Hα emission waveform in the considered discharges is similar to its waveforms in the conventional devises where chamber and plasma sizes are close each other. (M.Dreval and U-3M Team)