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Continuum Emission Spectroscopy on a Plasmaline Microwave Discharge Source

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  • Medicine


Continuum Emission Spectroscopy on a Plasmaline Microwave Discharge Source S. Hübner (1*) , E.A.D. Carbone (1) , A.J. Rijke (1) , J.J.A.M. van der Mullen (1) (1) Department of Applied Physics, Technische Universiteit Eindhoven, P.O. Box 513 5600 MB Eindhoven (*) [email protected] The visible range of radiation is the most often studied one. Essential plasma properties could be obtained by passive diagnostics of optical emission in this spectral region of a discharge. Because of the large errors in the usual determination of plasma properties it is convenient to apply multiple diagnostic methods. This so-called poly diagnostic approach can decrease the uncertainties a lot. In this study absolute bremsstrahlung continuum measurements were carried out. This straightforward technique was already used in the past (1) . From which we learned that accurate calibration is an important issue. In order to do so, one needs an absolute calibrated radiation source. Here a deuterium lamp and a tungsten ribbon lamp were used. As a validation the results of electron density were compared to Thomson Scattering measurements. The latter, active laser diagnostic method, is more reliable than continuum emission, but also more demanding. The complete setup for this diagnostic, including a triple grating spectrograph (TGS) for blocking the intense Rayleigh scattered light, is described elsewhere in detail (2,3) . The experiment was conducted on a plasmaline discharge setup. That means a discharge sustained by an inner conductor which is surrounded by a quartz tube. On the outside of this containment a vacuum vessel is situated with a low variable pressure of 1 to 20 mbar of argon gas. The input power at a fixed frequency of 2.45 GHz is about 100 to 300 W. A monochromator equipped with an CCD-camera for long-term light exposure was used. It should be mentioned here that line radiation of the plasma close to the wavele

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