Enhanced hard x-ray emission from microdroplet preplasma

Journal Article · Mon May 01 00:00:00 EDT 2006 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.2200761· OSTI ID:20779219

Anand, M; Kahaly, S; Ravindra Kumar, G; Krishnamurthy, M; Sandhu, A S; Gibbon, P ^[1]

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1. Tata Institute of Fundamental Research, 1 Homi Bhabha Road, Mumbai 400 005 (India)

We perform a comparative study of hard x-ray emission from femtosecond laser plasmas in 15 {mu}m methanol microdroplets and Perspex target. The hard x-ray yield from droplet plasmas is {approx_equal}68 times more than that obtained from solid plasmas at 2x10{sup 15} W cm{sup -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 8x10{sup 14} W cm{sup -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.

• OSTI ID: 20779219
• Journal Information: Applied Physics Letters, Vol. 88, Issue 18; Other Information: DOI: 10.1063/1.2200761; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
DROPLETS
ELECTRON TEMPERATURE
HARD X RADIATION
KEV RANGE 10-100
LASERS
LIGHT TRANSMISSION
METHANOL
PERSPEX
PHOTON EMISSION
PLASMA
PLASMA DENSITY
PLASMA SIMULATION
X-RAY SOURCES