Performance studies of new optics for the time-of-flight detector of the AFP project

Libor Nozka, Karel Cerny, Miroslav Hrabovsky, Tomas Komarek, Filip Krizek, Dusan Mandat, Marko Milovanovic, Michael Rijssenbeek, Petr Schovanek, Tomas Sykora, Vladimir Urbasek, Jaromir Zatloukal (+1 others)
2020 Optics Express  
We present the results of performance studies of the upgraded optical part of the time-of-flight subdetector prototype for the AFP (ATLAS Forward Proton) detector obtained during the test campaign in a synchrotron test-beam facility with 5 GeV electrons at the DESY laboratory (Hamburg, Germany) in June 2019. The detection of the particle arrival time is based on generation of Cherenkov light in an L-shaped fused silica bar. In the previous version of the ToF, all bars were made of two pieces
more » ... de of two pieces (radiator and light guide) glued together with a dedicated glue (Epotek 305). This solution suffers from additional radiation damage of glue. We adopted a new technique of bar production without the need of glue. The new bars have a higher optical throughput by a factor of 1.6, reduced fragility, and better geometrical precision.
doi:10.1364/oe.394582 pmid:32672248 fatcat:6sagbepdvnhdzlumemso5w6sym