CMS Upgrade

The upgrade program of the CMS detector is being designed to accomodate to the LHC plans for increasing its luminosity from its nominal design value of 1034 cm-2 s-1 to up to a factor 10, which implies the redesign and replacement of certain parts of the detector. A first upgrade program, so called Phase 1 in CMS, was built to cope with up to a factor 2 increase of instantaneous luminosity by 2016 and a Phase 2 upgrade program that should cope with up to a factor 10 integrated luminosity (3000 fb-1) and factors 5 to 10 instantaneous luminosity by 2023.

The CIEMAT group has been involved in the upgrade activities of the CMS DT project since the very beggining. We have had important responsibilites during the Phase 1 Upgrade (DT Upgrade coordinator) and have lead the upgrade program from its conception until now, when it is close to finalization.

The DT Phase 1 upgrade program consisted in the Sector Collector relocation during 2013-2014 with the extraction of the second level of electronics from the cavern into the counting room, and the corresponding copper to optical converters. This task was followed by the installation of new second level of trigger (TwinMux) and readout electronics (uROS) as part of the Phase 1 Upgrade.

The mid term future of LHC includes a major upgrade around 2020 which will increase its integrated luminosity (rate of collisions) by a factor of 10 beyond the original design value. This will require a redesign and replacement of certain parts of the detector. In particular in the DT chambers a significant portion of the readout and trigger electronics will be substituted. Our group is currently involved in the R&D of these detector upgrade activities. 

All the internal documents can be found in this web page: DT Upgrade Info



  • DT Sector Collector Relocation
  • TwinMux and uROS
  • HL-LHC CMS DT Upgrade (Phase 2)

The Sector Collector relocation was the first stage of the upgrade program for the Drift Tubes subdetector of the CMS experiment. It was accomplished during Long Shutdown 2013-2014, and consisted in the relocation of the second-level of trigger and readout electronics from the experimental (UXC) to the service cavern (USC), relieving the environmental constraints and improving accessibility for maintenance and future upgrades.

Extending the 30 meters copper electrical links for additional 100 m would degrade reliability, so the information was converted to optical with a custom system capable of dealing with the DC-unbalanced data. Initially, present electronics was used (during 2015 and up to 2017 for the ROS-25), so optical-to-copper conversion was also been installed.