Download methodological aspects of gas phase studies of an electric

39th international conference on plasma physics and CF, February 6 – 10, 2012, Zvenigorod.
METHODOLOGICAL ASPECTS OF GAS PHASE STUDIES OF AN ELECTRIC
EXPLOSION OF TUNGSTEN WIRES IN VACUUM
L.I. Urutskoev, D.V. Filippov, A.O. Biryukov, **A.A. Markolia, K.A. Alabin,
*
T.B. Shpakovskiy, *P.V. Belous, *G.K. Steshenko, *A.A. Levanov
Moscow State University of Printing Arts, Moscow, Russia, e-mail: [email protected]
*
Moscow Institute of Physics and Technology, Dolgoprudny, Russia
**
Sukhum Institute of Physics and Technology, Sukhum, Republic of Аbkhazia
There is currently undoubtedly that the ionization of the atom and the strong external magnetic
fields cansignificantly affect the likelihood of nuclear decay, and even change the very conditions
of stability of nuclei. For the weak nuclear processes (±-decay and K-capture) the effect studied in
considerable detail, both theoretically and experimentally. The report [1] presented at the
conference, considering the theoretically possible mechanism of influence of a superstrong
magnetic field, as a "catalyst" for α-decay.
It is shown experimentally that in earthly conditions achievement of high magnetic fields
(~109G) is possible using femtosecond lasers. More recently G. Shafeev's [2] group published the
results of study in which was observed acceleration of -decay of uranium nuclei in a dense plasma
produced by the explosion of metal nanoparticles under the influence of femtosecond laser pulses.
At a high-current electric explosion of metal wires, measured magnetic field amounts to H~1MG,
though, locally, this value may be exceeded by ten times. In work [3], published at the beginning of
last century, contains the assertion that authors [3] is clearly observed the presence of atomic lines
of helium in the spectral analysis of gas produced as a result of an electric explosion. The aim of
work presented in this report, was an attempt to play back the result declared in work [3] using basis
of modern diagnostic methods. By the very formulation of the problem, electric explosion of
tungsten wire required to be carry out in the volume isolated from the vacuum pump, which led to
follow a number of new requirements concerning the quality of the vacuum seal, the need for
degassing of the surface of the explosion chamber, etc., that have not previously encountered in
conducting such experiments. The report presents the methodology for determining the chemical
composition of gas produced by electric explosion, with gas mass spectrometers and methods of
spectral analysis. Described in detail methods of measuring the amount of N particles with mass
m=4, detected in blast chamber after the electric explosion. Discussed possible sources
measurement errors and the results of validation experiments. Presented results of measuring the
time dependence of pressure P(t) and N(t) with m=4, the behavior of which were quite unexpected.
Submitted the results of studies of plasma dynamics using photo-detecting methods, techniques of
optical spectral measurements and recording of intensity of light in time for the W-wires of
different diameters.
References.
[1]. D.V. Filippov and others, Loss of stability of heavy nuclei at ultrahigh magnetic fields.
[2]. V. Simakin and G.A. Shafeev, Applied Physics A, 2010, 101, 199; Physics of Wave
Phenomena, 2011,19, 30.
[3]. G.L. Wendt and C.E. Irion, Amer. Chem. Soc., 1922, 44, 1887.
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