2026-06-27T22:43:04Zhttps://docta.ucm.es/rest/oai/request
oai:docta.ucm.es:20.500.14352/730212024-07-19T16:19:08Zcom_20.500.14352_14col_20.500.14352_15
Docta Complutense author Pereira González, Augusto author Medrano Casanova, Mercedes author León Gutiérrez, Edgar author Pastor Santos, María Del Carmen author Mota García, Fernando author Vila Vázquez, Rafael Alberto author Rodríguez, C. author Carrasco García, Ricardo author Lapayese, F author Rodríguez Fernández, Carmen author Lapayese Puebla, Fernando author Peña Gómez, Ángel De La author Soleto Palomo, Alfonso author Rincón Rincón, Esther author Cabrera Pérez, Santiago author Queral Mas, Vicente author Fernández Navarro, Alejandro author López Heredero, Raquel author Torquemada Vico, María del Carmen author Rodrigo, T author Gómez, L author Belenguer Dávila, Tomás author Vermeeren, Ludo author Leysen, Willem author Piqueras, Juanjo author Le Guern, Frederic author Alén Cordero, Cristina 2023-06-22T12:40:14Z 2023-06-22T12:40:14Z 2023-03 0920-3796 10.1016/j.fusengdes.2023.113438 https://hdl.handle.net/20.500.14352/73021 https://doi.org/10.1016/j.fusengdes.2023.113438 https://www.sciencedirect.com/science/article/pii/S0920379623000224 The aim is to provide an assessment of radiation damage in coated films on refractive substrates that could be used as relevant information to protect the field lenses in optical diagnostics for ITER. Radiation-resistant optical materials with transparent properties should transfer light from plasma to detectors through the interspace until the port cell area where they are located (more than 10 m from the vacuum window). These optical coatings and substrates should have resilience enough to withstand neutron and gamma irradiation without significant degradation of their transmittance. Coated sapphire (Al2O3 windows), YAG with Broad Band Anti-Reflective (BBAR) and substrates of BaF2/CaF2 protected with anti-humidity coating (Parylene-C) were extensively tested. After testing, transmission mea- surements and analysis of optical surfaces yield significant discoveries. All substrates showed good refractive performance under gamma radiation. On the contrary, Parylene-C did not resist temperatures above 100 degrees Celsius as expected, according to manufacturing specifications. In addition, it was observed that with an energy dose of 332 kGy of gamma rays and a significantly lower temperature of 50 degrees Celsius, the Parylene-C protection is also damaged. Coated sapphire had the best overall performance with respect to the neutron irradiation tests. Nevertheless, the decrease in transmission observed in the YAG and BaF2 coated samples is not significant for the expected cumulative neutron dose that these samples will receive at their location within the diagnostic. This information was considered for the selection of the best candidates as refractive lenses and optical coatings for the Preliminary Design Review (PDR) of ex-vessel components that will integrate the Wide-Angle Viewing System (WAVS) for ITER Equatorial Port 12. eng Radiation effects in optical coatings for ITER diagnostics journal article URL https://docta.ucm.es/bitstreams/777b3fd0-8dcb-43bd-9ffd-40d7694ca009/download File MD5 934bba070b0da4f2e0ba724fcceeeb6e 6130384 application/pdf 1-s2.0-S0920379623000224-main.pdf URL https://docta.ucm.es/bitstreams/db910f61-5d74-4ee3-9fcd-ef98a2da4d18/download File MD5 7b88f1722fa83a106a34557e454383da 39536 text/plain 1-s2.0-S0920379623000224-main.pdf.txt