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BigBite Spectrometer Equipment

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.

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BigBite Spectrometer Equipment

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  1. BigBite Spectrometer Equipment by Douglas W. Higinbotham

  2. 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}

  3. 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)

  4. 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

  5. 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)

  6. 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

  7. 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!

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