Speaker
Description
The muon trigger of the ATLAS muon barrel is obtained using Resistive Plate Chambers (RPC). The legacy RPCs used in the experiment were designed to work to a reference luminosity of 10^34 cm-2 s-1 with a safety factor of 5, with respect to the expected background rates, corresponding to about 300 fb-1 integrated luminosity. It is expected that HL-LHC will reach a 7.5 times higher luminosity, working until at least 2040, leading to an integrated luminosity of 5000 fb-1, which is far beyond the conditions the RPC were supposed to face.
In order to cope these conditions, a major RPC upgrade project is foreseen by ATLAS. A new full coverage layer of 272 new generation RPC triplet chambers, will be installed in the inner barrel (BI), increasing the redundancy, the selectivity and the acceptance of the trigger.
The new RPCs will have a rate capability and longevity extended by a factor of 10 thanks to a new integrated design of front end electronics and detector faraday cage. The RPC gas gap is halved with respect to legacy RPC providing a correspondingly increased time resolution exploited by the embedded electronics capable to transmit at deterministic latency digitized RPC hits with 60 ps precision.
This new layer of RPC will lead to a more redundant and flexible trigger algorithm, allowing at the same time to operate the legacy RPCs at lower tensions, in order to extend their longevity until to all HL-LHC duration.
The first prototypes of the new RPCs, using the newly designed gas gaps have been already produced and tested this year.
The state of art of the upgrade project, as well as the first performance results on the prototypes of the new generation RPCs will be presented.
| Your name | Mauro Iodice |
|---|---|
| Institute | INFN - Roma Tre |
| mauro.iodice@cern.ch | |
| Nationality | Italian |
