SU1252715A1 - Interferometer for diagnostic checking of plasma - Google Patents

Abstract

The invention relates to the field of technology. physics. The accuracy of the nprf measurement of the electron plasma concentration is measured. The device contains a microwave generator 1, signal dividers 2.3, a rotator 4 of the polarization plane, a plasma chamber 6, a frequency shifter 7, a mixer (C) 8, a phase meter 10, a reference channel 11. The goal is achieved by introducing a second rotator 5 the second C 9 and the implementation of the second divider 3 three-channel. C 9 and 8 receive the radiation of the ordinary (E II H) and extraordinary (EIH) waves of the frequency f + F (F is the shift frequency, f is the frequency of the microwave generator 1) and the radiation of the wave of the reference channel 11 of the frequency f . At sample C 8 and 9, oscillations of the frequency inverter F are released, the phases of which correspond to the phases of ordinary and extraordinary waves transmitted through the plasma. Phase meter 10 measures the difference between these phases, and the electron concentration of a high-density magnetoactive plasma is calculated from it. 1 il. i (L tm t ate to h

Description

125271

H-goiter7) is related to technical physics, and is imme- diately to the microwave plasma diagnostics and can be used, for example, to determine the electron concentration, of a high-density magnetoactive gas discharge plasma.

The invention is an increase in accuracy when measuring the electron density of a high-density magneto-active plasma.

The drawing shows a structural electrical circuit of the proposed device.

An interferometer for plasma diagnostics contains a microwave generator 1, the first 2 and second 3 signal dividers, the first A and second 5 rotators of the polarization plane, the plasma chamber 6, the frequency shifter 7, the first B and second 9 mixers, the phase meter 10, the reference channel 11.

The device works as follows.

The microwave radiation of the microwave generator 1 is divided by a (film) divider 2 signal into signals arriving at the rotator 4 of the polarization plane and into the reference channel 11. The electric field vector E of the wave is turned by the rotator 4 of the polarization plane so that the angle between it and the vector The intensity of the transverse magnetic field H in the plasma was 30–40. Further, the microwave radiation is transmitted to the plasma chamber 6. In the presence of a magnetically active plasma, two waves propagate in it: the ordinary E C H N and the non-existent EiH, which enter the frequency shifter 7. Next, an ordinary and extraordinary wave with the converted frequency f + F (where f is the frequency of the microwave generator 1 and F is the frequency of the shift) passes through divider 3, with one of these waves falling on the first mixer 8, and the other on the second mixer 9. Vector electric

Editor O. Bugir

Compiled by A.Lysov

Tehred V. Kadar Proofreader L. Pilipenko

Order 4618/46 Circulation 778 Subscription VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

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The field E of the frequency wave f reflected from the film of the splitter 2 signal and propagating in the reference channel 11 is rotated by the rotator 5 of the polarization plane by an amount which provides a three-digit division on the divider 3 of the signal. In this case, the component of the wave of the reference channel with the polarization vector E, parallel to the wires of the lattice, the splitter of the 3 signal, goes to the mixer 9, and from the orthogonal one goes to the mixer 8.

Thus, the mixers 9 and 8 receive the radiation of ordinary and extraordinary waves of the frequency f - F and the radiation of the wave of the reference channel 11 of the frequency f. At the output of mixers 8 and 9, oscillations of the intermediate frequency F are separated, the phases of which correspond to the phases of ordinary and extraordinary waves transmitted through the plasma. Phase meter 10 measures the difference of these phases, from which the electron density of a high-density magnetoactive plasma is calculated.

Claims (1)

Invention Formula Plasma diagnostic interferometer containing a series-connected microwave generator, a first signal divider, a first polarization rotator, a plasma chamber, a frequency shifter, a second signal divider, a first mixer and a phase meter, with the reference channel between the second outputs of the first and second signal dividers, due to the fact that, in order to increase the accuracy in measuring the electron density of a high-density magnetoactive plasma, a second rotator of the polarization plane is inserted into the reference channel, The signal divider is three-channel, and a second mixer is connected between its output and the second input of the phase meter.