Measurement of the Laser Beam Position and Width for the Thomson Scattering Diagnostics on Tokamak COMPASS

0371331 - ÚFP 2012 RIV CZ eng C - Conference Paper (international conference)
Aftanas, Milan - Bílková, Petra - Böhm, Petr - Weinzettl, Vladimír - Stöckel, Jan - Hron, Martin - Pánek, Radomír
Measurement of the Laser Beam Position and Width for the Thomson Scattering Diagnostics on Tokamak COMPASS.
Proceedings of the 20th Annual Conference of Doctoral Students - WDS 2011. Prague: MATFYZPRESS, 2011 - (Šafránková, J.; Pavlů, J.), s. 237-240. WDS, 2. ISBN 978-80-7378-185-9.
[WDS 2011 - Annual Conference of Doctoral Students /20./. Prague (CZ), 31.05.2011-03.06.2011]
R&D Projects: GA ČR GA202/09/1467; GA MŠMT 7G10072
Institutional research plan: CEZ:AV0Z20430508
Keywords : plasma diagnostics * Tokamak devices
Subject RIV: BL - Plasma and Gas Discharge Physics
http://www.mff.cuni.cz/veda/konference/wds/proc/proc-contents.php?year=2011

COMPASS tokamak is equipped with new key diagnostic—Thomson scattering system. This unique multi-point system has been designed with the main aim to investigate electron density and temperature profiles on the COMPASS tokamak (R = 0.56 m, a = 0.18 m, BT max = 2.1 T). The spatial resolution is optimized namely for the pedestal studies (radial spatial resolution a/100). This contribution describes particular steps of optical alignment of the important part of the Thomson scattering system, Nd:YAG lasers (1.6 J at 1064 nm, 30 Hz). Laser beam width has to be precisely measured and laser beam position has to be precisely set before the measurement and checked for all laser shots to be able of decrypting the information about the plasma density and also to improve precision of the measurement. New tool for automatic measurement of the laser beam misalignment is introduced.
Permanent Link: http://hdl.handle.net/11104/0204872