Pulsed Capillary Discharge Operated As A Compact Soft X-Ray Source

Details Pulsed Capillary Discharge Operated As A Compact Soft X-Ray Source Pulsed Capillary Discharge Operated As A Compact Soft X-Ray Source

Jul 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010pobeo..89..327v&link_type=abstract

Publications of the Astronomical Observatory of Belgrade, vol. 89, pp. 327-330

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We analyze experimental results of radiation emission from a compact pulsed capillary ns discharge source, designed for soft x-ray applications, operated in Nitrogen and N/He mixtures at voltages in the range of 18-24kV. The discharge operates in an alumina capillary of length 21mm and 1.6mm inner diameter. The electrical energy stored is ~0.5 J with peak current of ~5kA. Fast charging from an IGBT based pulsed power circuit allows operation at 35-150 Hz. Characteristic time-integrated Nitrogen spectra were recorded from 10-220 Å with clear evidence of He-like Nitrogen line at 28.9 Å, which represents a possible source for a water window soft x-ray microscope. Time-evolution measurements show the influence of axial electron beams, generated by hollow cathode dynamics, on the x-ray emission. We discuss optimal frequency of operation, voltage applied, geometrical and pressure conditions for cathode and anode, for soft x-ray generation. Time-integrated MCP images of a filtered slit-wire system delivered an estimate of the maximum emission energy of our source, as well as clear evidence of full wall detachment, of ~100μm in radial size for the entire emission range.

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