A study of magnetically-supported dc discharge in cylindrical and   inverted cyclindrical configuration
  We have investigated apparently stochastic fluctuations of magnetically-supported dc discharge in cylindrical coaxial configuration. In the system the electric field had radial direction while the magnetic field was applied axially. The discharge vessel length was 12 centimetres. Working gas was typically argon at pressure of several Pa, magnetic field 10-50 mT. The contribution describes experimental results - frequency and phase analysis of the instabilities, which we detected in our experimental system in both the conventional and inverted magnetron configurations. We bring also 2-D PIC model of the dc discharge under conditions, which can be achieved in the experimental apparatus. 
Olena Bilyk, Pavel Kudrna, Miroslav Holik, Ales Marek, Milan Tichy