The laser spike of Ne-like argon 46.9 nm pumped by a capillary discharge is measured with an x-ray diode (XRD) at low Ar pressure (25 Pa). Changing the rise-time and amplitude of the main current, we observe the effects of current on the time of the laser spike. The experimental results show that the time of lasing onset, which is the time of the laser spike after the onset of the main current, is larger than 40 ns and almost constant when the rise-time and amplitude of the current are changed. The theoretical results are calculated with the snow-plough model and show that the plasma is pinched several times before the laser spike occurs.

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On a capillary discharge setup lasing in Ne-like Ar at 46.9nm, the ablation of c apillary wall was investigated for polythene and alumina material at both of inh erent 2—5kA-pre-pulse of setup and separate pre-pulse of 20A by measuring soft x ray emission from the capillary discharged. For inherent pre-pulse and polythe ne capillary, the ablation is too large to create uniform plasma columns and it is impossible to obtain lasing. In the case of 20A-pre-pulse and alumina capilla ry, the ablation decreased remarkably and the laser spike pulse was distinguishe d on an x-ray diode because the uniform Z-Pinch plasma column had formed.

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