Abstract
A Mach Zehnder interferometer is described which is used for electron line density measurements of a rapidly varying plasma. Fringe detections is made with a system of two photo-multipliers which allows one to follow the sense of variation of the electron line density in an unambiguous manner. The sensitivity of the device (approximately 0.01 fringe) allows precise measurements to be made in experimental situations where electron line density variations produce only fractions of a fringe shift. This interferometer is used to measure the electron line density of an axial current discharge in 25 mtorr H2. The density profile of the plasma is obtained by scanning a 3 mm wide He-Ne laser beam across the diameter of the discharge tube. Complete ionisation of the gas is found after 9 μsec.
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