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Energy Deposition in Gas NPL Active Media

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Lasers with Nuclear Pumping

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Abstract

As was noted in Sect. 1.2 of Chap. 1, the nuclear reactions that can be used for pumping gas NPLs in experiments with pulsed reactors are:

$$ {}^3\mathrm{H}\mathrm{e}+n\to {}^3\mathrm{H}+p+0.76\;\mathrm{M}\mathrm{e}\mathrm{V} $$
$$ {}^{10}\mathrm{B}+n\to {}^7\mathrm{L}\mathrm{i}+\alpha +2.38\;\mathrm{M}\mathrm{e}\mathrm{V}, $$
$$ {}^{235}\mathrm{U}+n\to \mathrm{fragments}+168\;\mathrm{M}\mathrm{e}\mathrm{V}. $$

When reaction (7.1) is used, the laser medium is excited by protons and tritium ions. In this case, 3He plays the role of a buffer component of the laser mixture and is simultaneously a volume pumping source. Calculations of the specific energy deposition to the gas medium when the reaction (7.1) is used were carried out in the studies [1, 2]. The gas pressure and the transverse dimension of the laser cell were varied (it was assumed that the length of the cell greatly exceeded its transverse dimension). It was shown that for each pressure value there is an optimal transverse dimension of the cell. When the dimensions are less than optimal, the losses of reaction (7.1) products on the walls of the cell become great. When the dimensions are greater than optimal, the decrease of the neutron flux in the direction from the cell boundary to the depth of the gas volume starts to have an effect. Some results of calculations are provided in Figs. 7.1 and 7.2. It should be noted that the model [2] makes it possible to perform calculations for different neutron spectra when more precise deceleration principles of charged particles are used. The results of the calculations in studies [1, 2] for the case of a mono-energetic flux of thermal neutrons differ by 10–15 % (Fig. 7.1).

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Authors and Affiliations

  1. The Russian Federal Nuclear Center, Sarov, Russia

    S. P. Melnikov, A. N. Sizov & A. A. Sinyanskii

  2. University of Illinois, Urbana, USA

    George H. Miley

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Melnikov, S.P., Sizov, A.N., Sinyanskii, A.A., Miley, G.H. (2015). Energy Deposition in Gas NPL Active Media. In: Lasers with Nuclear Pumping. Springer, Cham. https://doi.org/10.1007/978-3-319-08882-2_7

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