Study of Luminous Emission from a Coaxial Plasma Discharge Device in the Presence of External Transverse Magnetic Field
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Abstract
The experimental investigations in this paper are focused on the study of luminous radiation emission from coaxial plasma discharge device and the effect of applied transverse magnetic field <i>B<sub>tr</sub></i> on it. The experiment was done in (1.5 KJ - 10 KV) coaxial plasma discharge device. The discharge is operated in Nitrogen gas at pressures from 1 to 2.2 torr. Helmholtz magnetic coils are placed outside the coaxial electrodes with its axis at a distance = 3 cm from the coaxial electrodes muzzle, then <i>B<sub>tr</sub></i> with a maximum induction ≈ 0.85 T is applied perpendicularly to the expanded plasma from the coaxial electrodes muzzle. The diagnostics used in the measurements include a Rogowsky coil and a photomultiplier tube equipped with light collimator. The experimental results showed that the maximum intensity of luminous radiation is detected at axial distance (side view) <i>z</i> = 8 cm and gas pressure, <i>P</i> = 2.2 torr. It also showed that the maximum value of axial luminous plasma zone velocity = 2.383 × 10<sup>6</sup> cm/s at <i>z</i> = 11 cm and <i>P</i> = 1.4 torr. In mode of presence of external <i>B<sub>tr</sub></i>, the investigations have shown that, at <i>P</i> = 1.4 torr the maximum intensity of luminous radiation (detected at end-view position) is reduced by 17%, the full width at half maximum, <i>FWHM</i> of luminous radiation signal is increased by 40 times, while the luminous radiation signal is delayed by ta = 438 µs. In two modes of operation <i>t<sub>a</sub></i> and <i>FWHM</i> have approximately a minimum values at <i>P</i> = 1.4 torr.
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