Microsecond plasma opening switch experiments on GIT-4

The experiments performed allowed us to compare different kinds of plasma sources for high power MPOS applications. High electrode diameters and high switch energy deposition determine types of plasma source which can be used successfully. The analysis of many sets of experiments showes that high voltage/impedanse switch operation can be achieved in limear current density at the POS cathode does not exceed the value of 20 kA/cm. This value limits a maximum cathode diameterer of a MITL. Anode diameter is limited by condition of no gap closure with a dense electrode plasma. Application of external magnetic field decreases plasma density necessary for long POS conduction time operation.