1 Super BigBite concepts Bogdan Wojtsekhowski, JLab Physics requirementsSome experimentsLayout for the GEP-15Proposed spectrometerDetector configurationExpected parametersStages of implementation
2 Physics requirements Generic experiments to consider: Requirements: Inclusive (e,e’) - pol DISExclusive (e,e’N) - GEP/GMPSemi-inclusive (e,e’h) - SIDISRequirements:Solid angle - > 20 msrScattering angle deg.Momentum range GeV/c
3 Some of Experiments GMN with 6 GeV beam (Q2 up to 8 GeV2) Many experiments for 11 GeV beam:GEP - unique kinem. correlation -> L ~ 1039A1n/d2n; A1p/dp;Transversity (e,e’) and (e,e’K+/-)FFs with polarized target - GEN, GEP
5 Design considerations Vertical bendingDetector should be behind magnetic fieldCompact beam spot on the targetSimple dipole is the best for large momentum biteField integral and bend angle vs detector resolutionProgress in tracking detector technology
6 Proposed Spectrometer Magnet of 100 tons with aperture 46 cm x 122 cm full 3 Tesla-meter field integralDetector package:- GEM trackers resolution: 0.07 mm- Calorimeter based trigger > 1 GeV- Lead-glass PID for electron- Fast RICH from HERMES for ,KHow to put a wide magnet at 10o angle near the target?Iron yoke is cut off to allow for the beam pipe!
8 Layout of SuperBigBite 2-nd armRICH Preshower Shower
9 Parameters mrad msr Momentum acceptance at full field - 2 GeV/c and higherMomentum resolution ~ 0.5% for 8 GeV/cSolid angle at 14 degree is 55 msr (72” from pivot to yoke)Solid angle has aspect ratio 1:2.5Angle resolution of 0.3 mradVertex resolution of 1 mmTarget length 40 cmSimple optics, flat acceptance - perfect for terms like sin2mrad5101520msr13385885
10 The 48D48 magnet at BNL100 tons, 18.5” x 48” x 48” field volume
12 Best PID: fast RICH -like in HERMES Sensitive area ~ 60x200 cm2 viewed with 1934 PMTs
13 Plans Development will be driven/funded by the GEP-15 collaboration Components reused are a magnet and both calorimetersProposal GEP/GMP (GEP-15) is submitted to the PAC32Proposal GMN/GMP is under preparation to the next PACGMN with the magnet - before 2011 at 50% field ( 1/4 power )Support stand and full power for the magnet (refurbished BNL’s)Construction of the tracking detectors - BIG NEW!I - 10x10 cm prototype, II- 40x140 cm prototypeFranco’s collaboration: INFN+Glasgow+UVA+FIU+JLabReconstruction of the hadron calorimeter - W&M+DubnaMore proposals are under development for 12 GeV PACsPossible second arm magnet for the J/
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