Speaker
Dr.
Tatiana Karavicheva
(INR,RAS)
Description
As a result of the LHC injectors upgrade after the Long Shutdown (2019-2020),
the expected Pb-Pb luminosity and collision rate during the so called Runs 3 and 4
will considerably exceed the design parameters for several of the key ALICE
detectors systems including the forward trigger detectors. Fast Interaction Trigger
(FIT) will be the primary forward trigger, luminosity, and collision time
measurement detector. It will also determine multiplicity, centrality, and reaction
plane of heavy ion collisions. FIT is expected to match and even exceed the
functionality and performance currently secured by three ALICE sub-detectors: the
time zero detector (T0), the VZERO system, and the Forward Multiplicity Detector
(FMD). FIT will consist of two arrays of Cherenkov radiators with MCP-PMT
sensors and of a single, large-size scintillator ring. Because of the presence of the
muon spectrometer, the placement of the FIT arrays will be asymmetric: ~800 mm
from the interaction point (IP) on the absorber side and ~3200 mm from IP on the
opposite side. The ongoing beam tests and Monte Carlo studies verify the physics
performance and refine the geometry of the FIT arrays .The presentation gives a
short description of FIT , triggers and readout requirement for the ALICE
Upgrade, a summary of the performance, and the outcome of the simulations and
beam tests.
Primary authors
Dr.
Tatiana Karavicheva
(INR,RAS)
Mr.
Yury Melikyan
(NRNU MEPhI)
