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P: Fachverband Plasmaphysik
P 3: Diagnostik
P 3.7: Talk
Monday, March 30, 2009, 15:40–15:55, INP-Staffelgeschoß
HIBP calibration on WEGA stellarator — •Yuriy Podoba1, Matthias Otte1, Friedrich Wagner1, Alexander Zhezhera2, Alexander Chmyga2, Alexander Kozachok2, Alexander Komarov2, Ivan Bondarenko2, Galina Deshko2, Sergey Khrebtov2, and Ludmila Krupnik2 — 1Max-Planck-Institut für Plasmaphysik, Greifswald, Germany — 2Kharkov Institute of Plasma Physics, Kharkov, Ukraine
The heavy ion beam probe (HIBP) is an established non-perturbing diagnostic for determining spatial distributions of plasma potential, density, temperature and poloidal magnetic field of magnetically confined plasmas. These quantities can be determined from the change in the ion beam parameters (charge, intensity and trajectory) passing through a plasma volume due to collisions with electrons and interactions with the confining magnetic field. The WEGA HIBP operates with a Na+ with an energy of 39.5 keV and beam current 35 µA. Conventionally the coordinate mapping of the HIBP is provided by ray tracing calculations of the ion beam in the magnetic field. However, it is very difficult to include all physical effects in the model, thus the result of the calculations may significantly differ from the real probing position. In order to improve the mapping precision an additional measurements of the beam position have been provided using a beam detector array inside the vacuum vessel. This allows to compare the measured and calculated ion beam position in order to find out the reasons for the coordinate mismatch and include adjustments in the calculation code. Results of this calibration are presented in this work.