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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. The PIC model should answer questions, which originated from the experimental study of the plasma parameters – presented e.g. in [1].