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ATLAS C alorimeters Phase- 1, Phase-2 upgrades Calorimeters Electronics CERN group participation

ATLAS C alorimeters Phase- 1, Phase-2 upgrades Calorimeters Electronics CERN group participation. Calorimeters. Calorimeter detectors are expected to operate correctly through all life of ATLAS and will not be changed. Exception : upgrade of Forward calorimeter area

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ATLAS C alorimeters Phase- 1, Phase-2 upgrades Calorimeters Electronics CERN group participation

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  1. ATLAS Calorimeters Phase-1, Phase-2 upgrades • Calorimeters • Electronics CERN group participation Calo upgrades 27.4.2012

  2. Calorimeters • Calorimeter detectors are expected to operate correctly through all life of ATLAS and will not be changed. • Exception : upgrade of Forward calorimeter area • Beyond nominal luminosity ion build up can lead to loss of signal. • This is compounded by voltage drop across HV protection resistors located in the cryostat. • Effect of this will be signal degradation at the inner edge (high η) in the FCal • Beam heating could potentially cause Liquid Argon to boil Calo upgrades 27.4.2012

  3. Calorimeters • Options under discussion: • Replace FCAL with a new sFCAL • Smaller LAr gaps (250 um -> 100 um) • Needs additionally new summing boards and new cooling loops • Place a Mini-FCAL in front • Reduces energy and ionization in current FCAL to acceptable • Options CU-Diamonds, HP Xe, Cold Mini FCAL • All options being considered for Ph-2. Nothing in Ph-1. • All have (+-) implications with the EC cryostats Calo upgrades 27.4.2012

  4. Calorimeters • Opening of EC cryostats might be independently needed or not • To replace HEC Preamp electronics inside, at outer HEC radius • Will depend on exact dose and safety factors • Trying to measure this precisely • If needed, would integrate also FCAL upgrade Calo upgrades 27.4.2012

  5. Electronics for Calorimeters • All calorimeters electronics will need to be upgraded • Beyond their foreseen lifetime • Beyond their foreseen radiation tolerance • Triggering capabilities are degrading at higher and higher μ • Current electronics limits the latency budget for L1 trigger • Full exchange of FE and BE electronics in Ph-2 for Tile & LAr • Ph-1 clearly compromises ATLAS physics capability • Raise trigger thresholds for EM objects-> inacceptable To keep rate @ 20kHz,need to raise threshold to 35 GeV Thresholds for non isolated EM objects vs. Inst. Luminosity @ 20kHz Level-1 Trigger rate Calo upgrades 27.4.2012

  6. Electronics for Calorimeters • Use EM shower features (now used @ LVL2) to improve trigger @ LVL1: • keep single e-pT~25 GeV • Need more granularity at trigger LVL1 to reject jets faking triggers • Separate layer information helps (somewhat) for jets Proposal Use segmentation of 0.25×0.25 of MID layer generate Ratio factors Current Trigger (LVL1) Use 0.1×0.1 cells, Σ all depths Calo upgrades 27.4.2012

  7. Electronics for Calorimeters Calo upgrades 27.4.2012

  8. Electronics for Calorimeters • Implementation : • Increase the granularity sent to trigger Tower Builder Boards (TBBs) • Not build Towers any more, but transmit separate layers • No more analog transmission (UX15->USA15) but “super-cell” digitization on FE (SCDBs) • Keep analog system for Tile, as backup for LAr • Receive samples @ ~ROD like device (DPS), transform into Et, ΣEt... • Transmit those quantities to trigger processor (eFEX, jFEX) with sliding window algorithms Calo upgrades 27.4.2012

  9. Electronics for Calorimeters • Constraints :Needs to be compatible with rest of system • No FEB exchanges, only change partial sums (on mezzanine boards) • More signals to route: new baseplanes at FE crates • Keep total latency compatible with current L1 (2.5 μs) • Should be used in Ph-2 Calo upgrades 27.4.2012

  10. Electronics for Calorimeters • Should be used in Ph-2 Calo upgrades 27.4.2012

  11. Electronics for Calorimeters • Effort to introduce changes in adiabatic way • Keep Analog TBBs, cables, L1Calo preprocessor, processor…. • Install a demonstrator system in LS1 (~1Φ wedge) : • Modify one FE crate with new baseplane • Prototype SCDB, prototype DPS • Readout new trigger primitives, compare with standard L1Calo and with readout • In LS2 install new SCDBs boards in the FE, long fibers, New DPS boards in the BE • In LS3 full replacement of FE and BE RODs Calo upgrades 27.4.2012

  12. FE crate FE Boards TBB Trigger cables LVPS Calo upgrades 27.4.2012 12

  13. E.g. Barrel and Std EMEC Slot # “Easy” case 1 empty slot Needs SCDBto treat 284  channels  (PS:  30;  Front:  112;   Middle:  112;  Back:  30)   New baseplane Calo upgrades 27.4.2012

  14. Tile plans • No possibility to exchange all electronics and drawers for Ph-1 • Mandatory for Ph-2 • Current R&D program explores several options Calo upgrades 27.4.2012

  15. Tile plans Calo upgrades 27.4.2012

  16. Tile plans Calo upgrades 27.4.2012

  17. Tile plans Calo upgrades 27.4.2012

  18. Tile plans Calo upgrades 27.4.2012

  19. CERN groups participation • LAr • Electronics coordination • System tests @ SR1 EMF • Demonstrate new boards do not degrade current system • Demonstrate performance of new approach before installing on ATLAS • Start preparing system 2nd half of 2012 • Installation in ATLAS, Commissioning • Demonstrator in 1st half 2014 • Tile • Tests of 3 approaches @ setup in B175 • Demonstrate performance of new approach • Installation in ATLAS, Commissioning • 1stDemonstrator in 1st half 2014 • Both systems need support at the level of • Fellow • DOCT • Subsistences • Tile & LAr: Normally small CERN participation for deliverables Calo upgrades 27.4.2012

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