GlueX Collaboration Meeting, Newport News, October 25-27, 2007 GlueX Simulations Status Report Richard Jones GlueX Collaboration Meeting, Newport News, October 25-27, 2007
Dec 21, 2015
GlueX Collaboration Meeting, Newport News, October 25-27, 2007
GlueX Simulations
Status Report
Richard Jones
GlueX Collaboration Meeting, Newport News, October 25-27, 2007
GlueX collaboration meeting, Newport News, October 25-27, 2007 2
Major developments over last year Simulation workshop
in Newport News, Nov. 2006. define CD2 geometry document it implement in XML
GlueX collaboration meeting, Newport News, October 25-27, 2007 3
Major developments, cont. Tracking Review at
Jlab, Mar. 2007. reduce materials quantify effects
GlueX collaboration meeting, Newport News, October 25-27, 2007 4
FDC material reductions
Active region1. CD2 reference design2. reduction 13. reduction 2
Also note CDC1. end plate2. inner cylinder
CDC contribution will get much bigger with additional inner layers – MC study requiredMC study required
GlueX collaboration meeting, Newport News, October 25-27, 2007 5
Other FDC issues Singles rates Forward dead zone
is this resolved? Lorentz angle shifts of
FDC hits to be incorporated
in HDGeant?
GlueX collaboration meeting, Newport News, October 25-27, 2007 6
CDC modifications
Reductions change downstream end
plate from aluminum to carbon-epoxy composite
reduce thickness from 6mm to 4mm
New inner layers rates are OK
inner layers(hypothetical)
GlueX collaboration meeting, Newport News, October 25-27, 2007 7
CDC modifications
Reductions change downstream end
plate from aluminum to carbon-epoxy composite
reduce thickness from 6mm to 4mm
New inner layers rates are OK space is OK, once we
shrink the start counter what about forward what about forward
gamma shadowing?gamma shadowing?
MC study needed
GlueX collaboration meeting, Newport News, October 25-27, 2007 8
Start Counter
existing model based on CLAS design nice document in docdb describing the
existing design need revised document
specification on how to reduce the existing one
or, at leastor, at least
GlueX collaboration meeting, Newport News, October 25-27, 2007 9
Calorimetry
Major insights from simulations shift of UPV coverage to mate with BCAL focus on the BCAL/FCAL overlap region as key
to reconstructing important physics channels open question of BCAL energy threshold radiation damage around forward beam hole
Geometry models BCAL and FCAL models are stable UPV model is in flux New development in forward region, hopefully
GlueX collaboration meeting, Newport News, October 25-27, 2007 10
Gas Cerenkov
Stand-alone Monte Carlo toy model of Cerenkov optics, Eugene Chudakov
This mirror geometry can go into HDGeant. Is it ready for prime time?
GlueX collaboration meeting, Newport News, October 25-27, 2007 11
Reference Design for CD3
Now available from David and Simon
GlueX collaboration meeting, Newport News, October 25-27, 2007 12
Reference Design for CD3
Additional layers added to the CDC – tentative?– tentative? Start counter reduced to accomodate new inner
layers in CDC – needs work– needs work Changes to both the FDC annulus and active area
materials – excellent detail– excellent detail Adjust the positions of the FDC packages – good– good Change the shape of the Cerenkov nose from a tube
to a cone + put in correct mirrors, PMTs?+ put in correct mirrors, PMTs? Change magnetic field map from original 1400A to
larger 1500A – requires TOSCA recalculation, – requires TOSCA recalculation, good opportunity to extend coverage of the good opportunity to extend coverage of the mapmap
GlueX collaboration meeting, Newport News, October 25-27, 2007 13
Related developments
Improved detector response models for TOF and BCAL – Matt and Beni– Matt and Beni
Realistic inclusive hadronic event generation using Pythia – Elke and Eugene– Elke and Eugene
CEBAF beam raytracing simulation – CASA– CASA realistic halo model for tagger simulation currently limited by CASA sim statistics used to justify an updated halo spec for Hall D
preliminary spec: fraction outside core Gaussian < 10-5
estimate from raytracing: outside core Gaussian ~ 3·10-5
GlueX collaboration meeting, Newport News, October 25-27, 2007 14
Related developments
tagger backgrounds from halo less than 1% of signal with sizeable margin
GlueX collaboration meeting, Newport News, October 25-27, 2007 15
Action items
Implement improved magnetic field – Richard, – Richard, DavidDavid
Release the new reference geometry – Richard – Richard Incremental updates to geom v4 document – David – David Feedback on CDC changes material effects – Mihajlo – Mihajlo Implement mag. field effects in FDC – Simon– Simon Implement mag. field effects in FDC – ?– ? Implement new mirror geometry in hdds – Richard– Richard Implement and test new ideas in calorimetryImplement and test new ideas in calorimetry – –
team team