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Surface and bulk processes in materials induced by pulsed ion and plasma beams at Dense Plasma Focus devices

Pimenov V., Maslyaev S., Ivanov L., Dyomina E., Gribkov V., Dubrovsky A., Scholz M., Miklaszewski R., Ugaste U., Kolman B.

Nukleonika

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2006

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Vol. 51, nr 1

71-78

EN

A review of results and new data on the interaction of pulsed ion and dense plasma beams with metals in different Dense Plasma Focus (DPF) devices are presented. Different irradiation conditions with microsecond pulses of the power density in the range of 105 109 W/cm2 were applied. The most interesting thermal and radiation effects observed in both surface and bulk of the material positioned at the cathode part of the DPF device have been considered. Advanced directions of DPF use for scientific and applied problems of radiation material science were determined.

2

On the nature of changes in the optical characterization produced in sapphire on its irradiation with a pulsed powerful stream of hydrogen ions

Gribkov V., Ivanov L., Maslyaev S., Pimenov V., Sadowski M., Skladnik-Sadowska E., Banaszak A., Kopeć G., Cheblukov Y., Kozodaev M. A., Suvorov A. L., Smirnov I. S.

Nukleonika

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2004

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Vol. 49, nr 2

43-49

EN

Changes in the optical characteristics in synthetic sapphire specimens produced by microsecond pulse irradiation with a stream of hydrogen ions of energies ranging up to tens keV have been observed. Data on decrease in the optical reflection, measured within the wavelength range of 200 900 nm, are presented. This characterization is compared with the data received by optical and atomic force microscopy as well as by lattice structure analysis performed with X-rays. The measurements indicate that the changes of optical parameters are not a consequence of absorption increase and/or sapphire decomposition. They result from modifications of the morphology and structure of surface layer of the sapphire samples, induced by irradiation.

3

Influence of powerful pulses of hydrogen plasma upon materials in PF-1000 device

Pimenov V., Gribkov V., Dubrovsky A., Mezzetti F., Scholz M., Ugaste U., Dyomina E., Ivanov L., Maslyaev S., Miklaszewski R., Borowiecki M., De Chiara P., Pizzo L., Szydlowski A., Volobuev I. V.

Nukleonika

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2002

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Vol. 47, nr 4

155-162

EN

The results of experimental investigations of powerful hydrogen plasma jets and fast ion beams interaction with various materials (austenitic chromium-manganese steels, pure vanadium, tungsten, graphite, copper, and their alloys: Cu-4 mass% Ni and Cu-10 mass% Ga) are presented. The materials were placed on the discharge axis of the PF-1000 device and irradiated with fluxes of fast ions (of energy in the range from tens keV up to several MeV) and with plasma streams (of power flux density q~(108 109) W/cm2). It was found that the fast ions and plasma streams caused different damages to the aforementioned materials. A diverse character of the damages to the individual investigated material was revealed. Some peculiarities of the process as well as the correlation between the surface density of the "macroscopic" structural defects (blisters and craters) and the fluence of the fast ions implanted in the specimen are discussed.

4

Influence of dense deuterium plasma pulses on materials in Plasma Focus device

Ivanov L., Pimenov V., Maslyaev S., Dyomina E., Gribkov V., Mezzetti F., DeChiara P.

Nukleonika

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2000

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Vol. 45, nr 3

203-207

EN

Experiments on the influence of high-temperature plasma nanosecond pulse radiation, as generated in plasma focus device, on the W-Cu pseudoalloy, V-35at%Ti alloy, austenitic chromium-manganese 10Cr12Mn20W and 25Cr12Mn20W steels have been carried out. Features of damages, phase-structural transformations and chemical content changes in those materials under such irradiation were investigated.

5

Platek spaces

Ivanov L.

Fundamenta Informaticae

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2000

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Vol. 44, Nr 1,2

145-181

EN

The aim of this work is to axiomatize and enhance the recursion theory on monotonic hierarchies of operative spaces developed. This is to be accomplished by employing a special new variety of operative spaces called Platek spaces. The original structure studied by Platek in corresponds to the particular Platek space with structural class O = w and a bottom operative space consisting of single-valued partial functions over an arbitrary domain (Example 1.1 below). We believe that Platek spaces not only redefine Platek's approach in an abstract manner, but also provide the appropriate setting for an intrinsic Generalized Recursion Theory.

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Boldface recursion on Platek spaces

Ivanov L.

Fundamenta Informaticae

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2000

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Vol. 44, Nr 1,2

183-208

EN

The present work develops a boldface version of the theory of Platek spaces initiated. This is done by studying recursion on spaces with special elements which embody the so called transfer operation, Chapter 14 affording full lambda-abstraction. Transfer is characteristic of the monotonic hierarchies of operative spaces, which hierarchies form models of a typed lambda-mu-calculus. The principal result here is a boldface version of the abstract Platek First Recursion Theorem; we prove appropriate boldface Enumeration and Second Recursion Theorems as well.