Hard X-ray generation from microdroplets in intense laser fields |
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Authors: | M Anand C P Safvan M Krishnamurthy |
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Institution: | (1) Tata Institute of Fundamental Research, 1 Homi Bhabha Road, Mumbai, 400 005, India;(2) Nuclear Science Center, Aruna Asaf Ali Marg, New Delhi, 110067, India |
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Abstract: | Microdroplets of 15-μm diameter are subjected to ultra-short laser pulses of intensities up to 1015Wcm−2 to produce hot dense plasma. The hot electrons produced in the microdroplet plasma result in efficient generation of hard X-rays in the range 50–150keV at an irradiance as low as 8×1014Wcm−2. The X-ray source efficiency is estimated to be about 2 ×10−7%. A prepulse that is about 11ns ahead of the main pulse strongly influences the droplet plasma and the resulting X-ray emission. For a similar laser prepulse and intensity, no measurable hard X-ray emission is observed when the laser is focused on a solid target of similar composition and this indicates that liquid droplet targets are best suited for hard X-ray generation in laser–plasma interactions. |
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Keywords: | 79 20 Ds 52 25 Os 52 38 − r 52 50 Jm |
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