Speaker
Wladyslaw Henryk Trzaska
(University of Jyvaskyla (FI))
Description
Fast Interaction Trigger (FIT) will be the main forward trigger, luminometer and time zero detector for the ALICE experiment during LHC Run 3 and 4(from ~2020 onwards). It will also determine multiplicity, centrality, and reaction plane of heavy ion collisions. FIT will consist of two arrays of Cherenkov radiators coupled to MCP-PMT sensors and of a segmented scintillator ring increasing the acceptance, improving the performance, adding sensitivity to detect beam-gas events and providing some degree of redundancy. The arrays will be placed on the opposite sides of the interaction point (IP). Because of the asymmetry imposed by the presence of the hadron absorber, also the placement of the FIT arrays will be asymmetric: ~800 mm from IP on the absorber side and ~3200 mm from IP on the opposite side. Scheduled for installation during the Long Shutdown 2 (from mid 2018 till the end of 2019) FIT is in the midst of an intense R&D and prototyping period. The timing, amplitude and efficiency characteristics are determined with relativistic particles at CERN PS and with fast lasers. The ongoing Monte Carlo studies verify the physics performance and refine the geometry of the FIT arrays. The presentation will give a short description of FIT, summary of the performance, and the outcome of the simulations.
| On behalf of collaboration: | ALICE |
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Author
Wladyslaw Henryk Trzaska
(University of Jyvaskyla (FI))
