2015-11-17-MEMO-CSw¶

Offline:¶

• Tracker sign flip
  • We observe a sign flip in x when connecting TKU to TOF1 & TKD to TOF2
  • TKU and TKD are consistent with each other
  • In the MC, there is no flip in x, but there is a sign flip in y in the MC
  • For now focussing on real data:
    • The channel mapping looks OK
      • Verified by taking some data with different bits of the tracker turned on/off
      • The channels (at digit-level) show up exactly where expected based on understanding of tracker layout and drawing
    • The spacepoint position appears flipped
    • Points to somewhere in the digit->spacepoint bridge
      • could be either description of the geometry, or interpretation (code-handling) of the geometry, or reconstruction code
      • AD has looked through the geometry and believes it agrees with drawing
      • CHeidt believes the space-point algorithm is doing the right thing, given its inputs.
    • CHeidt and AD working through it
      • CHeidt has a "fix", which does fix it, but it is arbitrary.
    • EO and DR have just started looking at the code independently

• Tracker momentum reconstruction
  • CHunt has started looking into it this week, dissecting the reconstruction routines

• MC
  • Setup on offrec01, using G4BL 3-200 generated by JN
  • Processed a few to check scripts and speed, but holding off until (various) reconstruction issues are resolved

• Geometry
  • the EMR geometry has been fixed by RB (sensitive detector definitions in the GDML description)
    • FD needs to validate it

Infrastructure¶

• Failover tests scheduled for tomorrow (Nov 18)
  • trigger failover of CDB and servers, recover, document procedure