Enhanced hard x-ray emission from microdroplet preplasma

M. Anand; S. Kahaly; G. Ravindra Kumar; M. Krishnamurthy; A. S. Sandhu; P. Gibbon

doi:10.1063/1.2200761

Enhanced hard x-ray emission from microdroplet preplasma

M. Anand, S. Kahaly, G. Ravindra Kumar, M. Krishnamurthy, A. S. Sandhu, P. Gibbon

Research output: Contribution to journal › Article › peer-review

39 Scopus citations

Abstract

We perform a comparative study of hard x-ray emission from femtosecond laser plasmas in 15 μm methanol microdroplets and Perspex target. The hard x-ray yield from droplet plasmas is ≃68 times more than that obtained from solid plasmas at 2× 1015 W cm-2. A 10 ns prepulse at about 5% of the main pulse appears to be essential for hard x-ray generation from droplets. Hot electron temperature of 36 keV is measured from the droplets at 8× 1014 W cm-2, whereas a three times higher intensity is needed to obtain similar hot electron temperatures from Perspex plasmas. Particle-in-cell simulations with very long scale-length density profiles support experimental observations.

Original language	English (US)
Article number	181111
Journal	Applied Physics Letters
Volume	88
Issue number	18
DOIs	https://doi.org/10.1063/1.2200761
State	Published - May 1 2006
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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10.1063/1.2200761

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title = "Enhanced hard x-ray emission from microdroplet preplasma",

abstract = "We perform a comparative study of hard x-ray emission from femtosecond laser plasmas in 15 μm methanol microdroplets and Perspex target. The hard x-ray yield from droplet plasmas is ≃68 times more than that obtained from solid plasmas at 2× 1015 W cm-2. A 10 ns prepulse at about 5% of the main pulse appears to be essential for hard x-ray generation from droplets. Hot electron temperature of 36 keV is measured from the droplets at 8× 1014 W cm-2, whereas a three times higher intensity is needed to obtain similar hot electron temperatures from Perspex plasmas. Particle-in-cell simulations with very long scale-length density profiles support experimental observations.",

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AU - Anand, M.

AU - Kahaly, S.

AU - Ravindra Kumar, G.

AU - Krishnamurthy, M.

AU - Sandhu, A. S.

AU - Gibbon, P.

PY - 2006/5/1

Y1 - 2006/5/1

N2 - We perform a comparative study of hard x-ray emission from femtosecond laser plasmas in 15 μm methanol microdroplets and Perspex target. The hard x-ray yield from droplet plasmas is ≃68 times more than that obtained from solid plasmas at 2× 1015 W cm-2. A 10 ns prepulse at about 5% of the main pulse appears to be essential for hard x-ray generation from droplets. Hot electron temperature of 36 keV is measured from the droplets at 8× 1014 W cm-2, whereas a three times higher intensity is needed to obtain similar hot electron temperatures from Perspex plasmas. Particle-in-cell simulations with very long scale-length density profiles support experimental observations.

AB - We perform a comparative study of hard x-ray emission from femtosecond laser plasmas in 15 μm methanol microdroplets and Perspex target. The hard x-ray yield from droplet plasmas is ≃68 times more than that obtained from solid plasmas at 2× 1015 W cm-2. A 10 ns prepulse at about 5% of the main pulse appears to be essential for hard x-ray generation from droplets. Hot electron temperature of 36 keV is measured from the droplets at 8× 1014 W cm-2, whereas a three times higher intensity is needed to obtain similar hot electron temperatures from Perspex plasmas. Particle-in-cell simulations with very long scale-length density profiles support experimental observations.

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Enhanced hard x-ray emission from microdroplet preplasma

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