Heidelberg 2015 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 54: Laser Applications: Miscellaneous
Q 54.2: Vortrag
Donnerstag, 26. März 2015, 12:30–12:45, K/HS2
Investigation of laser-induced contamination in the KATRIN Raman system — •Matthias Wecker1, Sebastian Fischer1, Timothy James1, Magnus Schlösser2, and Helmut Telle2 — 1Karlsruhe Institute of Technology, Germany — 2Universidad Complutense de Madrid, Spain
Optics being exposed to high-power laser irradiation can suffer from laser-induced contamination (LIC), i.e. a loss of transmissivity due to the formation of a light absorbing layer at the position of the laser beam on the optics surface. The effect is triggered by outgassing material in the proximity of the optics which emanates volatile compounds, e.g. hydrocarbons.
LIC has been studied in the context of a Raman system developed and used for the monitoring of the isotopic purity of radioactive tritium gas. This system will be used in the Karlsruhe Tritium Neutrino (KATRIN) experiment, which aims for the determination of the neutrino mass in a model-independent approach. As the expected operation time of the KATRIN Raman system is five years with a duty cycle of > 60% at a minimum level of maintanance, LIC has to be minimized and suitable countermeasures for its removal found.
This talk gives an overview on the LIC-related issues in the KATRIN Raman system. It summarizes test experiments, which were conducted to investigate the effect of different outgassing materials and to test methods for the removal of LICs. Finally, the implications of the results on the projected long-term operation of the KATRIN Raman system are discussed.