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Definition: Muon & Quiet Bits

Definition: Muon & Quiet Bits. Definition: Muon bits: HCAL TPG calculates tower energy inside MIP window Note HCAL TPG reported on nonlinear E T scale -- not usable for MIP with Muon bit separately set and transmitted along with HCAL E T RCT ORs bits in 0.35   0.35  region

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Definition: Muon & Quiet Bits

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  1. Definition: Muon & Quiet Bits • Definition: • Muon bits: HCAL TPG calculates tower energy inside MIP window • Note HCAL TPG reported on nonlinear ET scale -- not usable for MIP with Muon bit separately set and transmitted along with HCAL ET • RCT ORs bits in 0.35   0.35  region • 252 Muon bits total accompany RCT electron candidate data • Quiet bits: RCT ET in 0.35   0.35  region below threshold • 252 Quiet bits total accompany RCT electron candidate data • Purpose: • Muon bits: independent muon detection & combination with existing muon triggers in GMT to confirm lower-quality triggers • Quiet bits: Combine with lowest threshold muon triggers in GMT to suppress punchthrough and other backgrounds. • GCT Processing: • Receive Q,M bits on electron candidate ECL cables. • Reorder into muon region order found in GMT • Transmit to GMT to Infiniband GT input • GT is unable to receive and remap RCT bits without rebuilding GT backplane and building new input (PSB) boards.

  2. GCT Project Muon & Quiet Bits • Background: • Part of the baseline design in the Trigger TDR • New GCT project approved after showing that all features of baseline design would be implemented • Including Muon & Quiet bits • New GCT project Muon & Quiet bit system was shown to be possible using the hardware planned for the rest of the system. • M & Q bits are not needed for start-up physics • Used in logic with the Global Muon Trigger to suppress backgrounds • Reason for Review: • Actual design for original implementation was found to use a large amount of the existing hardware in an inefficient manner. • To be covered in subsequent talk • GCT group has proposed a smaller more efficient design • Use of new technology implies technical risk • Group effort on this system is 2nd priority wrt. main GCT system • Determine if technical risk  schedule for use is acceptable.

  3. BACKUP • Calorimeter & Trigger Maps

  4. CMS Calorimeter Geometry EB, EE, HB, HE map to 18 RCT crates Provide e/g and jet, t, ET triggers

  5. Trigger Mapping

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