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X-ray and ion emission studies from subnanosecond laser-irradiated SiO2 aerogel foam targets

Published online by Cambridge University Press:  10 August 2017

C. Kaur ,
S. Chaurasia ,
A.A. Pisal ,
A.K. Rossall ,
D.S. Munda ,
A. Venkateswara Rao  and
M.N. Deo
C. Kaur
Affiliation:
High Pressure and Synchrotron Radiation Physics Division, Bhabha Atomic Research Centre, Mumbai – 400085, India Homi Bhabha National Institute, Anushaktinagar, Mumbai – 400 094, India
S. Chaurasia*
Affiliation:
High Pressure and Synchrotron Radiation Physics Division, Bhabha Atomic Research Centre, Mumbai – 400085, India
A.A. Pisal
Affiliation:
Air Glass Laboratory, Department of Physics, Shivaji University, Kohlapur – 416 004, Maharashtra, India
A.K. Rossall
Affiliation:
International Institute for Accelerator Applications, University of Huddersfield HD1 3DH, UK
D.S. Munda
Affiliation:
High Pressure and Synchrotron Radiation Physics Division, Bhabha Atomic Research Centre, Mumbai – 400085, India
A. Venkateswara Rao
Affiliation:
Air Glass Laboratory, Department of Physics, Shivaji University, Kohlapur – 416 004, Maharashtra, India
M.N. Deo
Affiliation:
High Pressure and Synchrotron Radiation Physics Division, Bhabha Atomic Research Centre, Mumbai – 400085, India
*
Address correspondence and reprint requests to: S. Chaurasia, High Pressure & Synchrotron Radiation Physics Division, Purnima Building, Bhabha Atomic research Centre, Trombay, Mumbai-400085, India. E-mail: [email protected]
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Abstract

In this experiment, a comparative study of ion and X-ray emission from both a SiO2 aerogel foam and a quartz target is performed. The experiment is performed using Nd:glass laser system operated at laser energy up to 15 J with a pulse duration of 500 ps with focusable intensity of 1013–1014 W/cm2 on target. X-ray fluxes in different spectral ranges (soft and hard) are measured by using X-ray diodes covered with Al filters of thickness 5 µm (0.9–1.56 keV) and 20 µm (3.4–16 keV). A 2.5 times enhancement in soft X-ray flux (0.9–1.56 keV) and a decrease of 1.8 times in hard X rays (3.4–16 keV) for 50 mg/cc SiO2 aerogel foam is observed compared with the solid quartz. A decrease in the flux of the K-shell line emission spectrum of soft X rays is noticed in the case of the foam targets. The high-resolution K-shell spectra (He-like) of Si ions in both the cases are analyzed for the determination of plasma parameters by comparing with FLYCHK simulations. The estimated plasma temperature and density are T c = 180 eV, n e = 7 × 1020 cm−3 and T c = 190 eV, n e = 4 × 1020 cm−3 for quartz and SiO2 aerogel foam, respectively. To measure the evolution of the plasma moving away from the targets, four identical ion collectors are placed at different angles (22.5, 30, 45, and 67.5°) from target normal. The angular distribution of the thermal ions are scaled as cosnθ with respect to target normal, where n = 3.8 and 4.8 for the foam and quartz, respectively. The experimental plasma volume measured from the ion collectors and shadowgraphy images are verified by a two-dimensional Eulerian radiative–hydrodynamic simulation (POLLUX code).

Keywords

X rays from laser-produced plasmaAerogel targetsX-ray enhancement
Type
Research Article
Information
Laser and Particle Beams , Volume 35 , Issue 3 , September 2017 , pp. 505 - 512
Copyright
Copyright © Cambridge University Press 2017 

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