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FCal2 Mapping Problem

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  1. FCal2 Mapping Problem P.Krieger, Toronto LAr Week, Munich, April 2011

  2. Bad Channel / FCal Positioning Studies • Plot of <Ecell> vs. rT (transverse distance of FCal cell from beamspot) • Here using run 169045 (Pb-Pb collision data: lots of FCal energy FCal1A FCal1C

  3. FCalA (three ranges of rT)

  4. FCalC (three ranges of rT)

  5. FCal2A rT < 180 mm i.e. FCal2A iϕ = 01, iη = 29 A2.01.29 A2.05.29 A2.09.29 A2.13.29 A2.02.29 A2.06.29 A2.10.29 A2.14.29

  6. FCal2C rT < 180 mm C2.01.29 C2.05.29 C2.09.29 C2.13.29 C2.02.29 C2.06.29 C2.10.29 C2.14.29

  7. Look at FCal2A Initial thought: A2.01.29   <-->  A2.02.29 A2.05.29   <-->  A2.06.29 A2.09.29   <-->  A2.10.29 A2.13.29   <-->  A2.14.29 since, according to mapping spreadsheet, or example, A2.06.29 has smaller rT than A2.05.29 But look more closely…..

  8. Drawing close to 1/10 scale View is of readout side of FCal2A (so towards the IP since that is the rear face)

  9. Drawing close to 1/10 scale

  10. FCal2A Signal Endplate Drawing FCal2A Readout Tile Drawing Drawing close to 1/10 scale Note that these views are from the same side, so should match.

  11. Reality Check: As-built detector modules

  12. FCal2C Inner Edge Tiling FCal2A Inner Edge Tiling Location of downward pointing fish-shaped channel consistent with FCal2 Tiling drawings.

  13. FCal3A check

  14. Summary • FCal2 channel mapping is OK (there is no mis-cabling). • FCal2 electrode mapping is wrong  tube layout pattern for entire FCal2 (both sides) is the mirror image of what is should be (and layout is not mirror symmetric). • The tube layout assumed for a given channel (iϕ,iη) is that that actually belonging to the channel with the same iη value but reflected iϕ. • This affects the shape and position of every FCal2 channel, but the effect is rather small except for irregular-shaped channels which have rather different shapes on the -x and +x side of the detector: in practical terms this mean un-summed channels at the inner and out edge. • This problem is not present for either the FCal1 or FCal3 modules. • The mapping needs to be fixed. But this will take a bit of time. • This will also necessitate regeneration of the nearest neighbour map (Sven) as well as changes to the simulation.