DRIFT CHAMBER

The Central Tracker proposed by the Bari and Lecce INFN groups for the detector IDEA at FCC-ee and CEPC is an ultra-light drift chamber equipped with cluster counting/timing readout techniques. Main peculiarities of this design are the high transparency in terms of multiple scattering contributions to the momentum measurement of charged particles and the very promising particle identification capabilities.

The proposal is inspired by the original design of the KLOE drift Chamber, successfully operated at the Daphne facility of the Frascati INFN Laboratories during 20 years (from 1999 until 2019) and culminated with the construction of the MEG2 drift chamber, which has just completed the commissioning phase at the PSI laboratories in Zurich and is ready to start data taking in 2022.

Drift chamber prototypes will need to be built and tested by the groups from INFN Lecce and Bari in the coming years.

The R&D program developed over the last few years has regarded five different topics:

• engineering design of the drift chamber end plates with a novel recovery scheme of the mechanical wire tension in order to minimize the amount of material in front of the end-plate calorimeter;
• development of a new type of field wires based on carbon monofilaments coated with a thin metal film to allow for ease of soldering;
• development of a fast digitizer coupled to a FPGA for fast filtering and pre-analysis of the signal spectra, aiming at strongly reducing the amount of data transfer;
• beam test on different configurations of drift tubes to establish the optimal operating parameters for an efficient application of the cluster counting technique;
• simulation and reconstruction of tracks in the IDEA drift chamber exploiting the cluster counting technique for particle identification and the cluster timing technique for improving the impact parameter resolution.