Investigation of the Compression of Magnetized Plasma and Magnetic Flux by Dimitry Mikitchuk

Author:Dimitry Mikitchuk
Language: eng
Format: epub, pdf
ISBN: 9783030208554
Publisher: Springer International Publishing

Fig. 2.6Spectroscopic setup for measurements of the plasma parameters

Fig. 2.7Interferometric setup

Figure 2.6 presents the optical setup used to measure simultaneously the plasma parameters along various chords of the cylindrical plasma. This spectroscopic setup was designed to consist only reflecting optics (i.e. mirrors) in order to exclude chromatic aberration that significantly distort the measurements when wide spectral region is used, as required here for the plasma parameters determination. The imploding plasma was imaged on the slit of the 0.5 m imaging spectrometer using a concave mirror. As shown in the Fig. 2.6, the concave mirror’s axis is rotated by 6, in order to separate the optical paths of the incident and reflected rays, while maintaining the astigmatic aberration small.

To study the instabilities evolution for different initial , 2D visible imaging and interferometry are used. The plasma is imaged from the radial direction by a 300-mm focal-length lens with 3 demagnification. The plasma self-emission filtered to the 4000–6000 Å region is recorded by an ICCD camera with a gate time of 5 ns.

The interferometric system, shown in Fig. 2.7, consists of a Michelson interferometer, using the second harmonic (532 nm) of a Q-switched Nd:YAG laser with a pulse duration of 7 ns and a CCD camera.

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