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BigBite Spectrometer Equipment
by
Douglas W. Higinbotham
BigBite Family of Experiments
• Threshold Pion Production (Hadron Package) {Cryo-Target}
• Transversity & d2 (Electron Package) {3He Target}
• Ay (HRS) & (e,e’d) (Hadron Package) {3He Target}
BigBite Infrastructure For Transversity
• Magnet Continues To Work Without Issue (one spare coil)
• Power Supply Has Had Only Minor Problems– Problem Tends To Be With Communication– We Rarely Change Field, So Not Big Issue– Technicians Have Tried To Fix This
• Extremely Tight Space To Get To 30 Degrees– New Right Foot Designed and Ordered– Work On Beam-line Area Needs To Be Done (Folts)
• GEN Field Clamp Extended• Re-use GEN Side Shielding • Add Better Internal Shielding (Multi-Experiment Problem)
BigBite Detectors For Transversity
• Three Full Wire Chambers– Send Middle Chamber To UVa During March– Designer Assigned– Upgrade Chamber Major Item For Review
• Trigger Scintillators• PreShower & Shower Detector
– Several PMTs Marginal (near 2kV) and Few Dead
– Either Buying 60 PMTs or 10 PMTs• NEW Gas Cherenkov Designed by Brad
– Major Item For Review– Asked JLab For 60k This FY For This Project
Wire-Chamber Electronics
• We have both VME and Fastbus! Though would need four more VME units for middle chamber read-out.
• 200 pre-Amp cards and associate equipment in production.
– Over 100 have been delivered.
– Rest In The Electronics Group’s Queue
• 40 more pre-Amp cards are being ordered.
• 210 needed for three 6 plane chambers (240 total order)
Electronics and Cables
• All experiments will share wirechamber electronics.• The pi0 & (e,e’d) experiments will be using mostly
their own NIM/CAMAC electronics.• d2 and Transversity NIM/CAMAC electronics
converging, BUT not yet finalized. – Brad is adding Cherenkov to trigger setup– Must be done in the coming week!– Albert Coming To Help Supervise Construction
Test Lab
• All BigBite experiments share the test lab space.– Douglas Manages The Space– Eugene Is Area Safety Warden
• Bertha Power Supply (440V) Needs To Be Moved To Test Lab– Single Source Of Power– Solves Outlet Problem and Hopefully Grounding Problems
• Safety Is Important– Some Items Need Safety Procedures– Procedures Needs Many Signatures
• Once GEP III Leaves, We Will Get Some Space Back• BUT, It Will Continue To Be Very Crowded
– Work Safely!