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In this Ph.D. project a method is developed to measure the magnetic field and to derive variations in the total plasma pressure due to (dia-) magnetic effects. For this purpose a plasma diagnostic has been set up at the fusion experiment ASDEX Upgrade to measure spectroscopically polarized light. The light is emitted from fast beam-particles excited by the plasma. Since the fast atoms travel through a magnetic field at high velocity, a strong Lorentz field is seen in the moving frame. This electric field gives rise to the so-called motional Stark-effect (MSE) and it is possible to conclude from the Stark-spectrum on the magnetic field.
