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Detector / Interaction Region Integration

Detector / Interaction Region Integration. Vasiliy Morozov, Charles Hyde, Pawel Nadel-Turonski Joint CASA/Accelerator and Nuclear Physics MEIC/ELIC Meeting February 3, 2012. Motivation. Pawel Nadel-Turonski. MEIC Primary “Full-Acceptance” Detector. 7 m. (approximately to scale).

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Detector / Interaction Region Integration

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  1. Detector / Interaction Region Integration Vasiliy Morozov, Charles Hyde, Pawel Nadel-Turonski Joint CASA/Accelerator and Nuclear Physics MEIC/ELIC Meeting February 3, 2012

  2. Motivation Pawel Nadel-Turonski

  3. MEIC Primary “Full-Acceptance” Detector 7 m (approximately to scale) detectors solenoid ion FFQs ion dipole w/ detectors ions IP 0mrad electrons electron FFQs 50 mrad 2 m Detect particles with angles below 0.5obeyond ion FFQs and in arcs. 2 m 2+3 m Central detector Detect particles with angles down to 0.5o before ion FFQs. Need up to 2 Tm dipole in addition to central solenoid. Central detector, more detection space in ion direction as particles have higher momenta TOF Make use of the (50 mr) crossing angle for ions! Solenoid yoke + Muon Detector Solenoid yoke + Hadronic Calorimeter Cerenkov RICH Muon Detector 4-5 m EM Calorimeter Tracking HTCC Hadron Calorimeter EM Calorimeter Distance IP – electron FFQs = 3.5 m Distance IP – ion FFQs = 7.0 m (Driven by push to 0.5 detection before ion FFQs) 2 m 3 m 2 m Pawel Nadel-Turonski & Rolf Ent

  4. GEANT4 Model • Detector solenoid • 4 T field at the center, 5 m long, 2.5 m inner radius, IP 2 m downstream from edge • Small spectrometer dipole in front of the FFB • 1.2 T (@ 60 GeV/c), 1 m long, hard-edge uniform field • Interaction plane and dipole are rotated around z to compensate orbit offset • FFB • Big spectrometer dipole • 4 m downstream of the FFB, sector bend, 3.5 m long, 60 mrad bending angle (12 Tm, 3.43 T @ 60 GeV/c), 20 cm square aperture

  5. Separation of Electron and Ion Beams

  6. Beam Parallel after FFB • FFB: quad lengths = 1.2, 2.4, 1.2 m, quad strengths @ 100 GeV/c = -79.6, 41.1, -23.1 T/m • 1.2 Tm (@ 60 GeV/c) outward-bending dipole in front of the final focus • 12 Tm (@ 60 GeV/c) inward-bending dipole 4 m downstream of the final focus Pawel Nadel-Turonski & Alex Bogacz

  7. FFB Acceptance • 60 GeV/c protons, each quad aperture = B max / (field gradient @ 100 GeV/c) 9 T max 6 T max 12 T max

  8. FFB Acceptance for Neutrons • Neutrons uniformly distributed within 1 horizontal & vertical angles around 60 GeV/c proton beam • Each quad aperture = B max / (field gradient @ 100 GeV/c) 9 T max 6 T max 12 T max

  9. System Acceptance at 6 T max Field • Uniform distribution horizontally & vertically within 1 around 60 GeV/c protons • Each quad aperture = 6 T / (field gradient @ 100 GeV/c)  electron beam  electron beam p/p = 0.5 p/p = -0.5 neutrons p/p = 0

  10. Momentum & Angle Resolution • Beam parallel after the final focus • Protons with p/p spread launched at different angles to nominal 60 GeV/c trajectory • Red hashed band indicates 10 beam stay-clear

  11. Momentum & Angle Resolution • Beam parallel after the final focus • Protons with p/p spread launched at different angles to nominal 60 GeV/c trajectory • Red hashed band indicates 10 beam stay-clear |p/p| > 0.03 @ x,y = 0

  12. Momentum & Angle Resolution • Beam parallel after the final focus • Protons with different p/p launched with x spread around nominal 60 GeV/c trajectory • Red hashed band indicates 10 beam stay-clear

  13. Momentum & Angle Resolution • Beam parallel after the final focus • Protons with different p/p launched with x spread around nominal 60 GeV/c trajectory • Red hashed band indicates 10 beam stay-clear |x| > 2 mrad @ p/p = 0

  14. Beam Focused after FFB • FFB: quad lengths = 1.2, 2.4, 1.2 m, quad strengths @ 100 GeV/c = -89.0, 51.1, -35.7 T/m • 1.2 Tm (@ 60 GeV/c) outward-bending dipole in front of the final focus • 12 Tm (@ 60 GeV/c) inward-bending dipole 4 m downstream of the final focus Pawel Nadel-Turonski & Charles Hyde

  15. System Acceptance at 6 T max Field • Uniform distribution horizontally & vertically within 1 around 60 GeV/c protons • Each quad aperture = 6 T / (field gradient @ 100 GeV/c)  electron beam  electron beam p/p = 0.5 p/p = -0.5 neutrons p/p = 0

  16. System Acceptance with Varied Quad Fields • Uniform distribution horizontally & vertically within 1 around 60 GeV/c protons • Quad apertures = 9, 9, 6 T / (field gradient @ 100 GeV/c)  electron beam  electron beam p/p = 0.5 p/p = -0.5 neutrons p/p = 0

  17. Detector / IR Layout n p e

  18. Momentum & Angle Resolution • Beam focused after the FFB • Protons with p/p spread launched at different angles to nominal 60 GeV/c trajectory • Red hashed band indicates 10 beam stay-clear

  19. Momentum & Angle Resolution • Beam focused after the FFB • Protons with p/p spread launched at different angles to nominal 60 GeV/c trajectory • Red hashed band indicates 10 beam stay-clear |p/p| > 0.005 @ x,y = 0

  20. Momentum & Angle Resolution • Beam focused after the FFB • Protons with different p/p launched with x spread around nominal 60 GeV/c trajectory • Red hashed band indicates 10 beam stay-clear

  21. Momentum & Angle Resolution • Beam focused after the FFB • Protons with different p/p launched with x spread around nominal 60 GeV/c trajectory • Red hashed band indicates 10 beam stay-clear |x| > N/A @ p/p = 0 |x| > 3 mrad @ p/p = 0

  22. Electron FFB • Quads nearest to IP are inside strong solenoid fringe field  either permanent-magnet or super-conducting quadrupoles • Consider hybrid electron FFB design (P. Nadel-Turonski & A. Bogacz): first two quads are permanent-magnet, subsequent quads are super-conducting (smaller OD) • Outer radius of a permanent-magnet quad (M. Sullivan) depending on the inner radius and field gradient:rinner = 20 mm, G = 15 T/m  router = 23.4 mm • Permanent-magnet quad • can be placed closer to IP • covers smaller solid angle  greater acceptance

  23. Hybrid Electron FFB Optics at 3 GeV/c • Drift lengths: 3, 0.25, 0.25, 1, 0.2 m • Quad lengths: 0.5, 0.5, 0.5, 0.5, 0.3 m • Quad inner radii: 2, 2, 2, 4, 4 cm; quad outer radii: 3, 3, 9, 11, 11 cm • Quad strengths: -15.0, 15.0, -5.87, 7.70, -8.48 T/m

  24. Hybrid Electron FFB Optics at 5 GeV/c • Drift lengths: 3, 0.25, 0.25, 1, 0.2 m • Quad lengths: 0.5, 0.5, 0.5, 0.5, 0.3 m • Quad inner radii: 2, 2, 2, 4, 4 cm; quad outer radii: 3, 3, 9, 11, 11 cm • Quad strengths: -15.0, 15.0, -14.7, 20.4, -19.3 T/m

  25. Hybrid Electron FFB Optics at 11 GeV/c • Drift lengths: 3, 0.25, 0.25, 1, 0.2 m • Quad lengths: 0.5, 0.5, 0.5, 0.5, 0.3 m • Quad inner radii: 2, 2, 2, 4, 4 cm; quad outer radii: 3, 3, 9, 11, 11 cm • Quad strengths: -15.0, 15.0, -34.0, 45.6, -38.0 T/m

  26. Detector / IR Layout n p e

  27. Upstream Ion / Downstream Electron Side • Electron FFB • 4 m distance to IP? • 1 polar angle acceptance • Superconducting quads (solenoid fringe field, small size, large aperture) • Electron beam focused inside spectrometer dipole? • Ion FFB • First quad immediately after first electron quad at ~4.5-5 m • Ion quads interleaved with electron quads

  28. Conclusions Completed the study of forward ion tagging, a few design choices to be made Request to nuclear physics Come up with specs for detector resolution requirements – this will help to motivate and make the design choices, in particular, quantify the advantages of focused vs parallel downstream ion beam To do list Design forward electron tagging and upstream ion FFB Design optimization, e.g. acceptance of the FFB using genetic algorithm Integration into the ring optics, such as decoupling, dispersion compensation, understanding effect of large-aperture quadrupoles on the optics, etc. Evaluation of the engineering aspects, such as magnet parameters, electron and ion beam line separation, etc.

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