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Physics Division Town Meeting

Physics Division Town Meeting. December 8, 2011. Hall C after 12 GeV Upgrade. Beam Energy: 2 – 11 GeV /c Super High Momentum Spectrometer (SHMS) Horizontal Bender, 3 Quads, Dipole P  11 GeV /c dP /P 0.5 – 1.0x10 -3 Acceptance: 5msr, 30% 5.5  <  < 40 

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Physics Division Town Meeting

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  1. Physics Division Town Meeting December 8, 2011

  2. Hall C after 12 GeV Upgrade • Beam Energy: 2 – 11 GeV/c • Super High Momentum Spectrometer (SHMS) • Horizontal Bender, 3 Quads, Dipole • P  11 GeV/c • dP/P 0.5 – 1.0x10-3 • Acceptance: 5msr, 30% • 5.5 <  < 40 • High Momentum Spectrometer (HMS) • P  7.5 GeV/c • dP/P 0.5 – 1.0x10-3 • Acceptance: 6.5msr, 18% • 10.5 <  < 90 • Minimum opening angle: 17 • Well shielded detector huts • Compton and Moller beam polarimeters • Ideal facility for: • Rosenbluth (L/T) separations • Inclusive & Exclusive reactions • Low cross sections (neutrino level)

  3. Approved and Conditional 12 GeV Hall C Experiments

  4. Hall C 5-10 years after upgrade • Maintain unique Hall C capabilities • High momentum • Low cross sections • L/T separations • Maintain ability for large installations/new facilities driven by physics • 0 detector • Inclusive/exclusive p(e,e0) • Large solid angle detector for backward nucleons • EMC/SRC • Reinstall HKS and HKS spectrometers • A(e,eK+) • Calorimeter for J/ detector • N J/ scattering length

  5. An (e,e0) L/T facility in Hall C Beam direction • Use HMS as precision electron arm for L/T • Remove SHMS HB magnet, install 0.3 Tm sweeping magnet (copy features of HB to minimize stray field on beam) • Add 25 msrp0 detector using 1116 PbWO4 blocks (with new temperature-controlled frame) • Cantilevered platforms of SHMS carriage (rotatable between 6 and 29 degrees) • Augment p0 detector with newPMT bases & flash ADCs • Dedicated beam pipe with large critical angle + shielding target RSIDIS RDIS disappears with Q2! HMS

  6. Backward nucleon detector – EMC effect HMS SHMS • Recycled CLAS6 TOF detectors

  7. HKS/HES in 12 GeV Hall C A(e,eK+) - One pass beam, low beam currents Compatible with a high energy/current parity program HES e- HKS K+ SHMS HMS

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