Speaker
Description
The PPS sub-detector of CMS, in operation since 2016, has shown exceptional performance, operating tracking and timing detectors in the challenging high radiation environment a few millimetres from the LHC beam. During Long Shutdown 3 the PPS detector will be upgraded with additional stations and a new timing detector based on LGAD+ETROC. The high and non-uniform irradiation requires dedicated techniques for radiation damage mitigation and a custom pixel geometry to meet operational requirements. FBK has been contracted to produce a custom TI-LGAD Pre-Production for PPS2, implementing the custom pixel geometry. Additional geometry variations, for optimising PPS2 physics acceptance have been implemented.
Standard LGADs, from the UFSD4 production, have been exposed to non-uniform irradiation gradients mimicking the extreme conditions expected in PPS2 with peak fluences up to 1E16 p/cm$^2$. Post irradiation, the IV characteristics of these sensors have been measured, compatible with community data from uniform irradiation. Work is ongoing on characterising these non-uniform irradiated sensors using test beam data.
Once delivered, the PPS2 TI-LGAD Pre-Production devices will be characterised before irradiation and after uniform and non-uniform irradiation, using the same procedures established with the standard UFSD4 LGADs. In preparation for these activities, a suite of multi-channel systems are being developed, with a test beam setup supporting up to 96 channels operating the sensors down to -30 C and a pogo-pin based test setup for multichannel IV measurements. The multichannel system is essential for evaluating the non-uniform irradiated devices across the irradiation gradient.
| Type of presentation (in-person/online) | in-person presentation |
|---|---|
| Type of presentation (I. scientific results or II. project proposal) | I. Presentation on scientific results |
