RT Journal Article
T1 Radiation effects in optical coatings for ITER diagnostics
A1 Pereira González, Augusto
A1 Medrano Casanova, Mercedes
A1 León Gutiérrez, Edgar
A1 Pastor Santos, María Del Carmen
A1 Mota García, Fernando
A1 Vila Vázquez, Rafael Alberto
A1 Rodríguez, C.
A1 Carrasco García, Ricardo
A1 Lapayese, F
A1 Rodríguez Fernández, Carmen
A1 Lapayese Puebla, Fernando
A1 Peña Gómez, Ángel De La
A1 Soleto Palomo, Alfonso
A1 Rincón Rincón, Esther
A1 Cabrera Pérez, Santiago
A1 Queral Mas, Vicente
A1 Fernández Navarro, Alejandro
A1 López Heredero, Raquel
A1 Torquemada Vico, María del Carmen
A1 Rodrigo, T
A1 Gómez, L
A1 Belenguer Dávila, Tomás
A1 Vermeeren, Ludo
A1 Leysen, Willem
A1 Piqueras, Juanjo
A1 Le Guern, Frederic
A1 Alén Cordero, Cristina
AB 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.
PB Elsevier Science SA
SN 0920-3796
YR 2023
FD 2023-03
LK https://hdl.handle.net/20.500.14352/73021
UL https://hdl.handle.net/20.500.14352/73021
LA eng
NO Received 19 October 2022, Revised 11 December 2022, Accepted 27 December 2022, Available online 13 January 2023, Version of Record 13 January 2023
NO Fusion for Energy
DS Docta Complutense
RD 22 abr 2025