Measurement of KrF-laser<i>–</i>plasma x-ray radiation from targets with various atomic numbers

Popil, R.; Gupta, P. D.; Fedosejevs, R.; Offenberger, A. A.

doi:10.1103/physreva.35.3874

Cited by 38 publications

(11 citation statements)

References 38 publications

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“…18 Additionally, irradiating by moderate intensities (<10 13 W/cm 2 ) of 0.25 lm KrF laser, the x-ray CE of laser produced C plasma is measured around 5%. 19 However, the above observations exclude the time resolved x-ray radiation energy. [15][16][17] Furthermore, although the above results are well accepted, an important issue must be reconsidered.…”

mentioning

confidence: 88%

Instantaneous x-ray radiation energy from laser produced polystyrene plasmas for shock ignition conditions

Shang

Wei

et al. 2013

Physics of Plasmas

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Laser target energy coupling mechanism is crucial in the shock ignition (SI) scheme, and x-ray radiation energy is a non-negligible portion of the laser produced plasma energy. To evaluate the x-ray radiation energy amount at conditions relevant to SI scheme, instantaneous x-ray radiation energy is investigated experimentally with continuum phase plates smoothed lasers irradiating layer polystyrene targets. Comparative laser pulses without and with shock spike are employed. With the measured x-ray angular distribution, full space x-ray radiation energy and conversion efficiency are observed. Instantaneous scaling law of x-ray conversion efficiency is obtained as a function of laser intensity and time. It should be pointed out that the scaling law is available for any laser pulse shape and intensity, with which irradiates polystyrene planar target with intensity from 2 × 1014 to 1.8 × 1015 W/cm2. Numerical analysis of the laser energy transformation is performed, and the simulation results agree with the experimental data.

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confidence: 88%

Instantaneous x-ray radiation energy from laser produced polystyrene plasmas for shock ignition conditions

Shang

Wei

et al. 2013

Physics of Plasmas

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“…Laser-produced plasmas from a metal target are a very useful tool with which to obtain soft Xrays (4)(5)(6)(7). The efficiency of producing X-rays and the emission spectrum depend on many factors, such as the laser incident energy, the characteristics of the focused beam, the laser wavelength, the laser pulse duration and the atomic number of the target.…”

Section: Introductionmentioning

confidence: 99%

Comparing soft X-ray pulses induced by different metallic plasmas

Siciliano

Lorusso

Velardi

et al. 2010

Radiation Effects and Defects in Solids

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In this work, we report on the characterization of pulsed soft X-rays emitted from laser-produced plasma by different targets. The measurements were performed in a vacuum stainless-steel chamber at 10 −7 mbar. The plasma was generated by a pulsed KrF excimer laser of 248 nm laser wavelength, operating with a single shot regime and having pulses of 23 ns full width at half maximum. The beam was focused on pure Si, Cu and Ta targets. The laser energies were 40, 80 and 120 mJ. The beam was focused on a spot of about 0.01 cm 2 with a resulting irradiance of 1.7, 3.5 and 5.2 × 10 8 W cm −2 . The detector used was a very sensitive Faraday cup which, when properly biased, was able to record time-resolved signals of X-rays and to estimate their energy. The X-ray energy values found were compared with the ion temperature of the target plasma, fitting the time-resolved ion current signals by the shifted Maxwell-Boltzmann velocity distribution.

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“…Important parameters of these sources, namely, their energy distribution, brilliance, source size, and pulse duration, have to be determined and optimized. There has been a substantial amount of work done on the X-ray yield scaling of such a source by varying various laser parameters such as wavelength, pulse duration, laser intensity, and also the atomic number of the target [1][2][3][4][5][6][7] using a variety of X-ray diagnostics. In some experiments, absolute measurements of the X-ray yield in the soft as well as hard X-ray regimes are required to validate theoretical models of laser-plasma interaction.…”

Section: Introductionmentioning

confidence: 99%

Comparison of thermo-luminescent detectors and X-ray vacuum detectors for measurement of X-ray yield from gold plasma produced by a sub-nanosecond Nd:glass laser

Chaurasia

Kumar

Poswal

et al. 2008

Nuclear Instruments and Methods in Physics Research Section A:

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Measurement of KrF-laser–plasma x-ray radiation from targets with various atomic numbers

Cited by 38 publications

References 38 publications

Instantaneous x-ray radiation energy from laser produced polystyrene plasmas for shock ignition conditions

Instantaneous x-ray radiation energy from laser produced polystyrene plasmas for shock ignition conditions

Comparing soft X-ray pulses induced by different metallic plasmas

Comparison of thermo-luminescent detectors and X-ray vacuum detectors for measurement of X-ray yield from gold plasma produced by a sub-nanosecond Nd:glass laser

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