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Super BigBite concepts Bogdan Wojtsekhowski, JLab

Super BigBite concepts Bogdan Wojtsekhowski, JLab. Physics requirements Some experiments Layout for the GEP-15 Proposed spectrometer Detector configuration Expected parameters Stages of implementation. Physics requirements. Generic experiments to consider:

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Super BigBite concepts Bogdan Wojtsekhowski, JLab

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  1. Super BigBite conceptsBogdan Wojtsekhowski, JLab Physics requirements Some experiments Layout for the GEP-15 Proposed spectrometer Detector configuration Expected parameters Stages of implementation

  2. Physics requirements Generic experiments to consider: • Inclusive (e,e’) - pol DIS • Exclusive (e,e’N) - GEP/GMP • Semi-inclusive (e,e’h) - SIDIS Requirements: • Solid angle - > 20 msr • Scattering angle - 5-30 deg. • Momentum range - 1-8 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 ~ 1039 • A1n/d2n; A1p/dp; • Transversity (e,e’) and (e,e’K+/-) • FFs with polarized target - GEN, GEP

  4. GEP-15 layout

  5. Design considerations • Vertical bending • Detector should be behind magnetic field • Compact beam spot on the target • Simple dipole is the best for large momentum bite • Field integral and bend angle vs detector resolution • Progress in tracking detector technology

  6. Proposed Spectrometer • Magnet of 100 tons with aperture 46 cm x 122 cm full 3 Tesla-meter field integral • Detector package:- GEM trackers resolution: 0.07 mm - Calorimeter based trigger > 1 GeV - Lead-glass PID for electron - Fast RICH from HERMES for ,K How to put a wide magnet at 10o angle near the target? Iron yoke is cut off to allow for the beam pipe!

  7. Small angle concept

  8. Layout of SuperBigBite 2-nd arm RICH Preshower Shower

  9. Parameters Momentum acceptance at full field - 2 GeV/c and higher Momentum resolution ~ 0.5% for 8 GeV/c Solid angle at 14 degree is 55 msr (72” from pivot to yoke) Solid angle has aspect ratio 1:2.5 Angle resolution of 0.3 mrad Vertex resolution of 1 mm Target length 40 cm Simple optics, flat acceptance - perfect for terms like sin2

  10. The 48D48 magnet at BNL 100 tons, 18.5” x 48” x 48” field volume

  11. GEM base tracker Rate capability ~ 10 kHz/mm2

  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 calorimeters • Proposal GEP/GMP (GEP-15) is submitted to the PAC32 • Proposal GMN/GMP is under preparation to the next PAC • GMN 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 prototype Franco’s collaboration: INFN+Glasgow+UVA+FIU+JLab • Reconstruction of the hadron calorimeter - W&M+Dubna • More proposals are under development for 12 GeV PACs • Possible second arm magnet for the J/

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