Abstract
Experiments carried out on SIGNAL facility have shown that X-ray lasing in Ne-like Ar plasma of fast capillary discharge occurs when directions of preionization current pulse and main current pulse are the opposite. When the currents directions are the same we don’t observe the X-ray lasing. In this report we give the interpretation of this effect. The role of the preionization current pulse is not just formation of partially ionized gas to quickly tear the plasma away from the capillary walls when the main pulse comes (Z-pinch effect) but also formation of stabilizing magnetic field (in the case of oppositely directed current pulses).
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