Upgrade of the ALICE central barrel tracking detectors: ITS and TPC
Özet
The ALICE Collaboration will undertake a major upgrade of the detector
apparatus during the second LHC Long Shutdown LS2 (2019-2020) in view of
the Runs 3 and 4 (2021-2029). The objective of the upgrade is two-fold:
i) an improvement of the tracking precision and efficiency, in
particular in the low-momentum range, ii) an improvement of the readout
capabilities of the experiment, in order to fully exploit the luminosity
for heavy ions envisaged after LS2. The first goal will be achieved by
replacing the Inner Tracking System with a new tracker, composed of
seven layers of silicon pixel detectors. The new tracker will be made up
of about 25000 Monolithic Active Pixel Sensors with fast readout,
resulting in a material thickness reduced to 0.3\% (inner layers) -1\%
(outer layers) of the radiation length and a granularity of 28 x28 mu
m(2). The second goal will be achieved, among other measures, by
replacing the readout chambers of the 90 m(3) Time Projection Chamber
with Micro Pattern Gaseous Detectors. In particular, the new readout
chambers will consist of stacks of 4 Gas Electron Multiplier foils
combining different hole pitches. The upgraded detector will operate
continuously without the use of a triggered gating grid. It will thus be
able to record all Pb-Pb collisions at the LHC interaction rate of 50
kHz.
Koleksiyonlar
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