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DT UPGRADE STRATEGY PowerPoint PPT Presentation

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DT UPGRADE STRATEGY. M.Dallavalle for the DT Collaboration. The DT plan for the future started in 2009 It covers from 2013 up to LS3 Physics target: warrant the same excellent performance while LHC “grows” up LS1 2013 is the first step of a long-term strategy

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M.Dallavalle for the DT Collaboration

  • The DT plan for the future started in 2009

    • It covers from 2013 up to LS3

    • Physics target: warrant the same excellent performance while LHC “grows” up

  • LS1 2013 is the first step of a long-term strategy

    • Improve robustness and longevity

    • Improve flexibility to adapt to new conditions and to exploit new possibilites

      • In particular for the TRIGGER

    • Learn from Today’s system: what & why improve

    Nowadays: System overview


    Sector collector

    Studies with single-hits show that the tubes can stand the LHC environment

    Aging of Minicrate electronics

    • On-chamber Minicrates contain TDCs and trigger ASICs. BTIs date back to mid 1990s. Boards have been tested for at-least 10 years of LHC at 10^34 Hz/cm2.

    • BTIM of Trigger Boards contain 4 BTI dies: bonds are sensitive to thermal stress during switch on/off. Current stock of spares is a potential issue.

    • Conclusion: Minicrates can survive until LS3 provided we reinforce our stock of BTIMs

    C. F. Bedoya May 22nd, 2012


    DT LS 1: Replacement of theta TRB


    Trigger in the theta view

    *BTIM functionality ported to rad-hard FPGA and new THETATRB being produced. These will replace the old THETATRBs in MB1 and MB2 of the external wheels (+2,-2)

    * Cannibalizeretrieved BTIM forreparationof PHI TRBs

    BTIM technology obsolete=> migrate to FPGA


    Minicrates in LS3

    • The electronics will be 30 years old

    • It has been designed for using HDL and the functionality can be transported to New more performing technologies

      • See theta TRB replacement as an example

  • However, the connections of Minicrates and the other system boxes constitute a bottleneck of the system: change to optical fibers as much as possible

  • Sector Collector limitations

    • In particular, the flow of Minicrate data goes through the Sector Collectors (one per wheel) in the detector towers and this is a limit to the connectivity of the minicrates and constitute potential single failure points, given the limited access to UXC

    • Move the SC to USC: connect all Minicrates to USC with optical fibers

    System overview after LS1





    Sector collector

    New TSC

    New opportunities with all chamber trigger data in USC

    • The optical fibers from the Minicrates can be split and offer input for running a new system in parallel to the current.

    • At trigger level can test new algorithms exploiting single chamber (or even single Super-Layer) triggers in the difficult regions

    • Can study new algorithms to improve redundancy with RPC (also available on fibers in USC).

    • DT/RPC coincidence at station level can improve the BX ID in situations of high PU

    Trigger Track finding limitations

    • The track finding algorithm requires trigger segments from at least 2 chambers along a muon track

    • This is a problem at eta +0.25,-0.25, i.e. in the cracks between wheel 0 and wheel +1,-1

    Inefficiency btwn YB0 andYB+1,-1

    another crack: The overlap region

    • Trigger logics memo:

    • CSCTF >= 3 CSC

    • DTTF >= 2 DTs

    • RPC 3of4 or 4of6 RPC

    • Overlap DT&CSC, RPC not used

    Perchaps coincidence of signals from single DT, CSC, RPC chambers can be exploited for improving the efficiency in difficult regions

    MuonPt assignment in trigger


    HLT: Full TDC data;

    Standalone muonsystem;limited by multiple scattering

    HLT: tracker + mu ID will allow trigger thresholds =< 20 GeV

    DTTF Xsec (μb)


    DTTF η<0.8


    DTTF η<1.2



    (Courtesy of C. Battilana (CIEMAT) )

    LV1 Track finder with Muon + tracker

    • extract selected tracker information and combine it with the muon system in order to produce a muon trigger at Level-1

    • after SC relocation, some PIXEL information (outer layer preferentially) could already be used, if available, in 2017

    • Keep independence of the new tracker design. Define Region-of-Interest

    R.o.I. for muon track

    • Different possibilities:

      • The RoI can be defined by the muon system at a pre-Lv1 stage so that the load of data transfer from the tracker is reduced. This probably needs a new fast detector underneath MB1 stations with very rough (10-25 cm) position determination (MTT (CMS IN-2007/058), Y.Erdogan’s talk at this morning’s DT upgrade session,)

      • The RoI can be defined at the Regional Level, using the DT trigger primitives to search the full tracker data (P.L.Zotto, DT part in upgrade Technical Proposal)

      • The RoI can be defined by the tracker searching in the muon primitives a matching segment to a tracker stub (with tracker pt above threshold)

    DT ugrade strategy in short

    • PHASE 1 LS1 (2013-2014)

    • Replacement of theta TRB (Trigger boards) : new TRBs use FPGAs; recuperate BTIMs as spares for R-phi TRBs

    • * Relocation of Sector Collector from the cavern (UXC) to the counting room (USC): optical fibers to bring TDC data and trigger primitives from all chambers in USC

    PHASE 1 following steps (not strictly related to LHC shutdowns) (2015-2017):

    Exploit optical fibers bringing all chamber (trigger) data in USC for running also a concurrent system for track finding (may also use RPC, pixel?, …)

    * Replacement of DTTF (DT Track Finder)

    * Redesign of the TSC boards (Sector Collector trigger)

    * Redesign of the ROS boards (Sector Collector read-out)

    PHASE 2 (LS3) (2018 and beyond)

    * Insert connection with the tracker in the Level-1 trigger system (RoI)

    * Replacement of Minicrate electronics??



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