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DT UPGRADE STRATEGY

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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DT UPGRADE STRATEGY

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  1. DT UPGRADE STRATEGY M.Dallavalle for the DT Collaboration

  2. 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

  3. Nowadays: System overview TRBs Sector collector

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

  5. 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

  6. C. F. Bedoya May 22nd, 2012 6 DT LS 1: Replacement of theta TRB Minicrate 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 DTTF

  7. 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

  8. 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

  9. System overview after LS1 UXC USC 2016-2017? DTTF Sector collector New TSC

  10. 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

  11. 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

  12. Inefficiency btwn YB0 andYB+1,-1

  13. 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

  14. MuonPt assignment in trigger LV1 HLT: Full TDC data; Standalone muonsystem;limited by multiple scattering HLT: tracker + mu ID will allow trigger thresholds =< 20 GeV

  15. DTTF Xsec (μb) 1 DTTF η<0.8 0.1 DTTF η<1.2 0.01 0.001 (Courtesy of C. Battilana (CIEMAT) )

  16. 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

  17. 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)

  18. 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??

  19. Conclusions …possibly….

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