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Enhancing Physics Research Capabilities at 12 GeV Hall C: Upgrade Details and Future Prospects

This detailed presentation discusses the December 8, 2011, Town Meeting regarding the post-upgrade plans for Hall C at a beam energy range of 2-11 GeV/c. The upgrade includes the Super High Momentum Spectrometer (SHMS) with horizontal bender, quads, and dipole components. It covers minimum opening angles, detector huts, and beam polarimeters, offering ideal facilities for various reactions, L/T separations, and low cross sections. The future plans involve installing new facilities for p0 detectors, nucleon detectors, and detectors for exclusive reactions. Additionally, it includes the reuse of CLAS6 TOF detectors and upgrades to spectrometers, beam pipes, and detectors to enhance the research capabilities of the facility. The meeting emphasized maintaining Hall C's unique high momentum and L/T separation capabilities while accommodating new physics-driven installations and large experimental facilities.

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Enhancing Physics Research Capabilities at 12 GeV Hall C: Upgrade Details and Future Prospects

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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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