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Faster-than-Light Electromagnetic Radiation Source

#1158


Experimental Investigation of Faster-than-Light Electromagnetic Radiation Source Characteristics

Tech Area / Field

  • PHY-OPL/Optics and Lasers/Physics

Status
8 Project completed

Registration date
08.12.1997

Completion date
09.10.2003

Senior Project Manager
Novozhilov V V

Leading Institute
VNIIEF, Russia, N. Novgorod reg., Sarov

Supporting institutes

  • VNIITF, Russia, Chelyabinsk reg., Snezhinsk

Collaborators

  • Metatech Corporation, USA, CA, Goleta

Project summary

With X-ray obliquely incident on a conducting surface the photoelectron current pulse is produced with the front moving along it with the velocity exceeding that of the light in vacuum. The pulse is a source of the electromagnetic radiation (N.J.Carron and C.L.Longmire. "Electromagnetic Pulse Produced by Obliquely Incident X-Rays". IEEE Trans.Nucl.Sci., vol №8-23,1976, pp 1897-1902). Moreover this radiation has directional character. Such radiation is a macroscopic analogue of the Cherenkov's emission. The frequency spectrum of this radiation is very wide if the X-Ray is very short. When some conditions such as small X-Ray duration (and high intensity) and proper choice of the corresponding irradiated object geometry are met electromagnetic pulse generation is possible in the "electromagnetic missile" regime that is characterized with significant Frenel zone increase and diffractionless electromagnetic radiation (EMR) propagation (H.M.Shen and T.T.Wu. "The properties of electromagnetic missile". J.Appl.Phys. 66(9), 1989, pp 4025-4034).

There is no literature information on the direct experimental research of outlined above phenomena. The proposed Project is logical continuation of works on the theoretical ISTC Project №299 "A faster-than-light EMR source of the electromagnetic irradiation.

Possibility of creation. Application to produce ultrahigh electric fields" that accomplished in 1997. The aim of the proposed Project is to investigate experimentally and to compare with theory the characteristics a faster-than-light EMR source initiated with X ray obliquely incident on conducting surface and to determine the concrete possibilities its civil applications.

It is a peculiarity of the proposed Project experiments that laser plasma suggested to be used as a source of a short X-ray pulse. Laser plasma is produced by focusing short pulse (tL ~ 0.3-1 ns) high-power laser radiation (LR) of "Iskra-5" facility on the solid target. It is the advantage of such approach that dimensions, pulse length and X-ray source spectrum could be varied in principle to study their influence on EMR parameters. Studying of these dependencies is necessary to formulate the demands to the parameters of more compact (than laser-plasma facility) X-ray source based on X-ray tube and to create the industrial device of EMR source in the future.

A flat metallic plate with the length ~1 meter and the length to width ration of ~10 would be use as a conducting surface. The plate should be placed towards the X-ray source so that firstly to ensure the oblique incidence of its front onto surface and secondly that the boundary of the photoelectric current layer should move along larger longitudinal axis of the plate. To enhance the energy of electrons and thereby to enhance EMR amplitude the constant electric field for their acceleration would be created. For this aim a practically X-ray transparent metallic grid with positive potential up to 100 keV should be spaced at some distance from the plate (thereby experimental emitter is a kind of a capacitor).

For some years participating institutes conduct experimental and theoretical studies of X-ray parameters of high-temperature laser produced plasma rather close in their direction in the offered Project, great experience is accumulated in measurements of pulsed electric and magnetic fields (on the nuclear weapon tests) and electron currents with high time resolution.

To perform experiments we shall construct a stand consisting of one channel of the laser "ISKRA-5" facility and vacuum target chamber with a radioabsorbing coating of the inner surface. The chamber will be equipped with a diagnostic complex to measure parameters of laser, X-ray and EMR. We suppose to research time and space characteristics of the generating EMR and of their dependencies on X-ray parameters and on voltage that applied to the model capacitor.

As a result, we shall formulate requirements to X-ray source and model capacitor parameters necessary to create a laboratory and then rather compact industrial sample of a initially a laboratory arrangement model and then an industrial sample of a novel, ultrabroadband EMR source. These sources will be use in the transport (navigation technique), in the medicine (diagnostics and cancer therapy), industry (metal and coverage processing), in the microwave electronics with the wavelength less than 1 cm.

It is supposed that in the course of the project work performance cooperation and information exchange with American and European scientists engaged in similar problems would take place.


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