Journal
JOURNAL OF PHYSICS D-APPLIED PHYSICS
Volume 36, Issue 19, Pages 2421-2426Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0022-3727/36/19/017
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A new and (simple) versatile high-density sub-micron liquid spray source has been developed and examined for use in laser-plasma interaction studies. Sub-micron sized water droplets were produced in a spray by hypersonic expansion of superheated water vapour through a nozzle into vacuum. Employing Mie scattering and transmission measurement of the spray, the size of individual droplets were determined to a diameter of d = (0.15 +/- 0.01) mum. The droplet number density varied from (1.6 +/- 0.5) x 10(11) up to (7.5 +/- 0.7) x 10(10) droplets cm(-3) depending on the position below the nozzle while the maximum mean atomic density was > 10(18) atoms cm(-3). This water spray target system provides a six to eight times higher x-ray emission at photon energies below 10 keV compared to a single droplet (15 mum diameter) source where both were irradiated with ultrafast (35 fs) 20 TW Ti: Sa laser pulses.
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