First mirror contamination studies for polarimetry MSE measurements for ITER
The Motional Stark Effect (MSE) diagnostic on ITER will need to guide the light through a labyrinth of mirrors to provide neutron shielding. Knowledge of how the mirrors change the polarization is essential for accurate determination of the q-profile. The optical properties of the plasma facing mirror are also expected to change with time due to exposition/ erosion. For the purpose of examining this experimentally a detector system, using twin Photo Elastic Modules (PEM) was constructed. Measurements have been performed on freshly prepared mirrors, on mirrors after exposure to plasmas in Tore Supra and labyrinth designs. The result shows a significant effect on the optical properties and demonstrate the need for in situ monitoring. We propose strategies to reduce the problem.
Bibliographic Reference: An oral paper given at: 15th Topical Conference on High-Temperature Plasma Diagnostics Organised by: General Atomics, San Diego (US) Held at: Hyatt Regency Islandia Hotel, San Diego(US)
Availability: Available from Association EURATOM-CEA, Département de Recherches sur la Fusion Contrôlée, CEA Cadarache, F-13108 St Paul-Lez-Durance, France Tel: (+33) 4 42 25 70 01; Fax: (+33) 4 42 25 64 21 E-mail: firstname.lastname@example.org
Record Number: 200417505 / Last updated on: 2004-05-10
Original language: en
Available languages: en