The influence op the Bθ field on MPOS performance

Our results support the hydro model demonstrating the ability to control the MPOS conduction by magnetic field in the switch region. Since this model deals with plasma CM displacement one may expect that any action aimed to prevent plasma motion would increase the conduction time and peak switch current. The important question is the effective switch opening when the conduction is lengthened by such means. If the low density plasma is preferable for effective opening then such lengthening may be the way to increase the output power of MPOS at MA currents. It must be noted however that the requirement of high magnetic field strength in the switch region must be fulfilled as well. Fig.4 shows as well the calculated total B_θ field at the moment t=t_C. One may see that the significant resistance decrease corresponds to the case when the magnetic field becomes zero.