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News from eRHIC Matt Lamont, Thomas Ullrich , William Foreman, Anders Kirleis , Michael Savastio , Peter Schnatz Elke Aschenauer and the CAD- eRHIC Team. ERL-based eRHIC Design. 5 mm. 5 mm. 5 mm. 5 mm. 20 GeV e -beam. 16 GeV e -beam. Common vacuum chamber. 12 GeV e -beam.

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  1. News from eRHICMatt Lamont,Thomas Ullrich,William Foreman,Anders Kirleis, Michael Savastio,Peter SchnatzElkeAschenauerand the CAD-eRHIC Team

  2. ERL-based eRHIC Design 5 mm 5 mm 5 mm 5 mm 20 GeV e-beam 16 GeV e-beam Common vacuum chamber 12 GeV e-beam 8 GeV e-beam 2 x 200 m SRF linac 4 (5) GeV per pass 5 (4) passes eRHIC detector Gap 5 mm total 0.3 T for 30 GeV Polarized e-gun 10-20 GeV ex 325 GeV p 130 GeV/u Au possibility of 30 GeV @ low current operation Beam dump MeRHIC detector Coherent e-cooler PHENIX STAR 4 to 5 vertically separated recirculating passes

  3. Geometrical constraints: If it is possible use the existing interaction region at RHIC 2 o’clock and wider tunnel to place the superconducting linac inside it. Minimize civil construction cost and re-use for eRHIC already built and installed linac. Medium Energy eRHIC Concept

  4. IR-Design for MeRHIC IP-2 • no synchrotron shielding included • allows p and heavy ion decay product tagging • IP-2 height beam-pipe floor 5’-8” (with digging ~10’)

  5. Zeus @ HERA I

  6. Zeus @ HERA II

  7. Hera I vs Hera II

  8. The Alan Caldwell detector p Si tracking stations EM Calorimeter Hadronic Calorimeter Compact – fits in dipole magnet with inner radius of 80 cm. Long - |z|5 m e

  9. The Alan Caldwell detector 2x14 Si tracking stations

  10. First ideas for a detector concept Solenoid (4T) Dipol 3Tm Dipol 3Tm FPD FED // // ZDC / TRD r: 5 ft / 1.5m ~15m

  11. central tracking ala BaBar Drift Chambers

  12. ToDo list • optimize magnetic fields • do we need 4T for solenoid and 3Tm for dipole • what radiation length can we tolerate  low Q2 • optimize distance Dipole to Solenoid • impact of beam lines through the detector on physics • need to optimize acceptance at low scattering angle • need acceptance down to 1o • finalize code to write root-trees

  13. Start immediately at 12o’clock

  14. 12:00 experimental area

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