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The Phase2 geometries are automatically created using the script generate2026Geometry.py.

Different versions of various subdetectors can be combined. The available versions are:

Tracker:

  • T5: Phase2 tilted tracker (v6.1.3) w/ phase 2 pixel (v4.0.2.5)
  • T6: Phase2 tilted tracker (v6.1.4) w/ phase 2 pixel (v4.0.4) (TEDD slighly rotated + Inner Tracker barrel has lower radii than TDR T5 geometry)
  • T14: Phase2 tilted tracker (v6.1.6) w/ phase 2 pixel (v6.1.3) (Based from T12. OT: reduced envelope. IT: new chip size, different radii, 2x2 modules everywhere in TEPX, new ring paradigm in TEPX)
  • T15: Phase2 tilted tracker (v6.1.6) w/ phase 2 pixel (v6.1.3) (Active geometry: same as T14. Material Budget: major update in IT, gathering info from recent Mechanical designs.)

Calorimeters:

  • C4: HGCal (v9) + Phase2 HCAL and EB
  • C6: HGCal (v9) + HFNose + Phase2 HCAL and EB
  • C8: HGCal (v10 post TDR HGCal Geometry) + Phase2 HCAL and EB + Tracker cables in calorimeter region
  • C9: HGCal (v11 post TDR HGCal Geometry same as V8 + corner centering for HE part)

Muon system:

  • M2: Phase2 muon system for TDR w/ GE2/1, ME0, RE3/1, RE4/1 (incl. granularity in ME0, staggered GE2/1)
  • M3: same as M2 with change to the number of iRPC strips from 192 to 96 as in TDR

Fast Timing system:

  • I5: Fast Timing detector (LYSO barrel, silicon endcap), full description with passive materials, LYSO bars along z flat
  • I7: Fast Timing detector (LYSO barrel, silicon endcap), full description with passive materials, LYSO bars along phi flat
  • I9: Same as I7 but with ETL in the position defined in O3
  • I10: Same as I9 w/ material adjustments

The script also handles the common and forward elements of the geometry:

  • O2: detailed cavern description
  • O3: O2 + changes due to modified CALO region due to changes in the Endcap part
  • F2: modifications needed to accommodate detailed cavern, ZDC description is removed.
  • F3: same as F2 but changes due to HFNose

Several detector combinations have been generated:

  • D35 = T6+C4+M2+I5+O2+F2
  • D41 = T14+C8+M3+I9+O3+F2
  • D43 = T14+C4+M3+I7+O2+F2
  • D44 = T14+C6+M3+I7+O2+F3
  • D45 = T15+C8+M3+I10+O3+F2
  • D46 = T15+C9+M3+I10+O3+F2

D35 is the baseline for the MTD TDR, and D41 is the baseline for the L1T TDR.