Calorimeter Transition Region Richard Jones & Paul Eugenio GlueX Collaboration Meeting January 11, 2008.

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Presentation transcript:

Calorimeter Transition Region Richard Jones & Paul Eugenio GlueX Collaboration Meeting January 11, 2008

Calorimeter Transition Region

CD3 geometry improved, but gap still apparent

Gap Access via Cerenkov voids Redesigned Cerenkov housing gap access

Add Conic Gap Calorimeter

Gap Calorimeter segment conical unit 9o9o 11 o GCAL cm

GCAL module concept Use BCAL module to construct GCAL modules  machine 16 GCAL per BCAL module  requires 3 additional BCAL modules (48→51, +6%)‏ 25 cm 8 cm 14 cm 10 cm 13 cm GCAL cone

Example: 1 GeV photon at 9.3º Provides a clean definition of the forward calorimeter acceptance

Noticethe early conversion in the cables is 99% recovered in the GCal Notice: the early conversion in the cables is 99% recovered in the GCal Example: 1 GeV photon at 10º

This is clearly the most difficult case. E bcal +E gcal = 88% E0 Notice:in addition to capturing most of the escape energy, the Gcal also shadows the Fcal from the forward splash Notice: in addition to capturing most of the escape energy, the Gcal also shadows the Fcal from the forward splash Example: 1 GeV photon at 11º

By 12º the BCal captures the entire shower Example: 1 GeV photon at 12º

No clustering, just summing energy but proximity to source means that the energy is highly localized – see event image at 10º These photons are substantially lost in the simulation without the GCal Energy Spectrum: 1 GeV photons at 10.5º

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