<p>In this thesis visible spectroscopy is developed and used for two applications.</p><p>Studies of motional Stark effect spectra for diagnosing the current distribution in the fusion plasmas with two different spectroscopic diagnostic systems: ratiometry and interferometry. Both systems provide non-invasive method for diagnosis of the internal plasma properties, e.g. magnetic field. Pitch angle of magnetic field lines are obtained from polarisation of Stark split <i>H</i>α<sub> </sub>spectral lines emitted by energetic hydrogen atoms injected into the plasma volume by neutral beam. Several methods of calibration of the systems on TEXTOR and JET are discussed. The main result of this work is the first measurement of the safety factor radial profile with new ratiometric MSE system on TEXTOR.</p><p>Studies of molecular fragmentation of free molecules <i>CH</i><sub>4</sub> and <i>NH</i><sub>3 </sub>excited with synchrotron radiation by detection of the fluorescence from the fragments. The results give the decay path ways for the molecules when excited below the<i> N</i> and <i>C i</i>onisation edges.</p>
| Identifer | oai:union.ndltd.org:UPSALLA/oai:DiVA.org:kth-4252 |
| Date | January 2006 |
| Creators | Jakubowska, Katarzyna |
| Publisher | KTH, Physics, Stockholm : Fysik |
| Source Sets | DiVA Archive at Upsalla University |
| Language | English |
| Detected Language | English |
| Type | Licentiate thesis, comprehensive summary, text |
| Relation | Trita-FYS, 0280-316X ; 2006:66 |
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