In case of low pressure (1.6 Pa) both rotary and turbo pump operation were required. On reducing the pressure below 1 Pa the discharge was difficult to sustain (the reflected power increases more than 10%)
In case of lowpressure (1.6 Pa) both rotary and turbo pumpoperation were required. On reducing the pressurebelow 1 Pa the discharge was difficult to sustain(the reflected power increases more than 10%)