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      https://www.ias.ac.in/article/fulltext/pram/075/06/1191-1196

    • Keywords

       

      Low-density foam; X-ray emission; volume absorption.

    • Abstract

       

      Experiments were performed with a 15 J/500 ps Nd:glass laser ($\lambda = 1064$ nm) focussed to an intensity > 1014 W/cm2 . X-ray emissions from carbon foam and 5% Pt-doped carbon foam of density 150–300 mg/cc were compared with that of the solid carbon targets. The thickness of the carbon foam was 15 𝜇m on a graphite substrate. X-ray emission was measured using semiconductor X-ray diodes covered with various filters having transmissions in different X-ray spectral ranges. It covered X-ray spectrum of 0.8–8.5 keV range. The X-ray emission in the soft X-ray region was observed to increase to about 1.8 times and 2.3 times in carbon foam and Pt-doped foam, respectively with respect to solid carbon. In hard X-rays, there was no measurable difference amongst the carbon foam, Pt-doped carbon foam and solid carbon. Scanning electron microscope (SEM) analysis demonstrates that foam targets smoothens the crater formed by the laser irradiation.

    • Author Affiliations

       

      S Chaurasia1 S Tripathi1 D S Munda1 G Mishra1 C G Murali1 N K Gupta1 L J Dhareshwar1 A K Rossall2 G J Tallents2 Rashmi Singh3 D K Kohli3 R K Khardekar3

      1. Laser & Neutron Physics Section, Bhabha Atomic Research Centre, Mumbai 400 085, India
      2. Department of Physics, University of York, York, Y0105 DD, UK
      3. Target Lab, Raja Ramanna Centre for Advanced Technology, Indore 452 013, India
    • Dates

       
  • Pramana – Journal of Physics | News

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