1. GlueX Simulations Status Report on CD3 geometry Richard Jones GlueX Collaboration Meeting, Newport News, January 10-12, 2008

2. GlueX collaboration meeting, Newport News, January 10-12, 2008 2 Detector subsystems  Target - unchanged  Start Counter - updated  Central Drift Chamber - updated  Forward Drift Chamber - updated  Barrel Calorimeter - updated  Upstream Calorimeter/Veto – removed  Gas Cerenkov - updated  Time-of-Flight counter - unchanged  Forward Calorimeter - unchanged  Solenoid / magnetic field – updates in progress

3. GlueX collaboration meeting, Newport News, January 10-12, 2008 3 Target - unchanged  liquid hydrogen volume diameter 3 cm length 30 cm kapton walls 150 m thick  vacuum chamber walls 1 cm of high-density (0.11 g/cm 3 ) ROHACELL exterior diameter 8 cm  vacuum entrance, exit windows 70 m of aluminum

4. GlueX collaboration meeting, Newport News, January 10-12, 2008 4 Start Counter - updated  layer structure high density ROHACELL r=6.95 - 7.48 cm scintillator 2.15 mm thick low density ROHACELL r=7.69 – 8.68 cm cellulose wrapping tape 0.5 mm thick  forward tapered section first conical section 22.5° taper second conical segment 45° taper all layers constant thickness innermost diameter 4.58 cm

5. GlueX collaboration meeting, Newport News, January 10-12, 2008 5 Central Drift Chamber - updated  active length shortened to 150 cm  two options for stereo layer sequence option 1 1.stereo layers 4-7 and 13-16 2.sequence -,-,+,+ in each option 2 1.stereo layers 4-6, 12-14, 20-22 2.sequences -,-,- ; +,+,+ ; -,-,-  trade-off issues polar angle resolution track finding / pattern recognition

6. GlueX collaboration meeting, Newport News, January 10-12, 2008 6 Forward Drift Chamber - updated  changed package positions compressed in z last package in stronger field region  different dead region in each package 2.3 cm, 3.2 cm, 3.9 cm, 4.6 cm  important reduction in outer radius of active region now r=48.5 cm allows space for HV coupling capacitors  detailed sandwich repeating structure for frames  important new materials at r=60cm for cooling 0.5 mm copper cylinder around frame periphery 0.7 mm aluinum cylinder between packages

7. GlueX collaboration meeting, Newport News, January 10-12, 2008 7 Barrel Calorimeter - updated  overall dimensions unchanged  new readout segmentation scheme innermost 12 cm covered by 4 (phi) x 6 (depth) 2 x 2 cm 2 cells with Winston cones and SiPMs. outermost 10.48 cm covered by 2 x 2 5.23 x 5.04 cm 2 cells with light collectors, light pipes  readout scheme specifies coupling with Winston cones of uniform 2 x 2 cm 2 collection area large gaps appear in phi at outer layers coverage ranges from 92.6% (layer 1) to 80.4% (layer 6) for inner layers, 96.7% - 90.7% outer layers may affect energy resolution, should be studied only energy in readout cells is seen in simulation

8. GlueX collaboration meeting, Newport News, January 10-12, 2008 8 Barrel Calorimeter - updated  total channel count settled 2304 SiPM channels (upstream + downstream 384 outer channels (several per Planacon?)  routing of light pipes not shown, probably doesn’t matter because outside acceptance

9. GlueX collaboration meeting, Newport News, January 10-12, 2008 9 Upstream Veto – removed  commented out

10. GlueX collaboration meeting, Newport News, January 10-12, 2008 10 Gas Cerenkov Stand-alone Monte Carlo toy model of Cerenkov optics, Eugene Chudakov This mirror geometry is now in HDGeant. Optical properties by E. Chudakov

11. GlueX collaboration meeting, Newport News, January 10-12, 2008 11 Time-of-Flight counter - unchanged  two layers 2.54 cm thick square area 255 cm on a side square beam hole 12 cm on a side unwrapped in simulation, probably ok

12. GlueX collaboration meeting, Newport News, January 10-12, 2008 12 Forward Calorimeter - unchanged  quasi circular, radius 29 x 4 cm  beam hole 3 x 3 blocks  nothing special for beam-hole region  energy deposition response model

13. GlueX collaboration meeting, Newport News, January 10-12, 2008 13 Solenoid / magnetic field  uniform field in azimuth  map coverage from 4 cm to 254 cm  linear extrapolation outside mapped region probably inaccurate in downstream region update underway to new larger map new map dimensions ?? CD3 studies should use the new map

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