Shift interferometry for the study of the micropinch

Shift interferometry for the study of the micropinch plasma Tatyana Klimyuk group T 9 -21

CONTENT 1. The object of investigation 2. Interferometry in plasma studies 3. The main features of the shift method 4. Conclusions and objectives

The object of investigation Micropinch phenomenon takes place in the low-inductive vacuum spark trigger anode cathode trigger

The object of investigation trigger anode Properties of a micropinch plasma: ne =1020 cm-3 to the moment of pinching cathode Te ~ 50 e. V trigger Axial symmetry

Interferometry in plasma studies object Mach-Zehnder interferometer laser Michelson interferometer anode Problems: 1) Object is inside of the measuring system 2) Distorted interferogramm for big gradients of density object laser

Interferometry in plasma studies Why is the picture so distorted? Because the phase shift differs a lot in two neighboring areas Solusion: SHIFT INTERFEROMETER object laser

The main features of the shift method The phase difference of interfering beams: We can select the spatial shift this way: So the phase difference is expressed by the gradient of the refraction coefficient

The main features of the shift method We can obtain the integral density of plasma from this expression:

CONCLUSIONS & PERSPECTIVES 1. We can vary the accuracy by the selecting the transverse shift 2. The measuring system is very compact. So it can be used in big installations 3. The nearest aims: a) to make such a device with the spatial shift in two directions b) to obtain the interferogram on the “Pion” installation

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