1 / 37

MEIC Detector and IR Integration

MEIC Detector and IR Integration. Vasiliy Morozov, Charles Hyde, Pawel Nadel-Turonski MEIC Detector and IR Design Mini-Workshop, October 31, 2011. MEIC Primary “Full-Acceptance” Detector. 7 m. (approximately to scale). detectors. solenoid. ion FFQs. ion dipole w/ detectors. ions. IP.

angelo
Download Presentation

MEIC Detector and IR Integration

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. MEIC Detector and IR Integration Vasiliy Morozov, Charles Hyde, Pawel Nadel-Turonski MEIC Detector and IR Design Mini-Workshop, October 31, 2011

  2. 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

  3. Interaction Region: Ions Distance from the IP to the first FF quad = 7 m Quad strengths of FF triplet at 100 GeV/c Q1 = -64.1 T/m Q2 = 64.5 T/m Q3 = -17.0 T/m ±10 cm quad aperture allows clear line of sight at ±0.5 CCB next to FFB for chromatic correction Chromaticity Compensation Block (CCB) Beam Extension Section Final Focusing Block (FFB) 7 m βymax ~ 2700 m βx* = 10 cm βy* = 2 cm Whole Interaction Region: 158 m

  4. Tracking Through FFB • Maximum excursion in X plane for positive particle • At lower p/p values, maximum x occurs in the 2nd quad; at higher p/p values, maximum x is in the 3rd quad • p/p is equivalent to (q/m), i.e. p after d break up behaves as p/p = -0.5

  5. Maximum Orbit Excursion vs Momentum Offset • Quad aperture = Field at the pole tip / Maximum field gradient

  6. G4beamline Simulations • GEANT 4 toolkit for beam line simulations • Realistic simulations of complete system at later design stages • Not very well suited for optimization tasks p/p = -0.5 p/p = 0.0 p/p = 0.5

  7. Detector Solenoid • 4 T field at the center, 5 m long, 2.5 m inner radius, IP 2 m downstream from edge • Realistic solenoid model: many infinitely-thin current sheets evenly spread radially • Ion beam at IP is at 50 mrad to the solenoid axis • 60 GeV/c proton orbit distortion at the entrance into the spectrometer dipole 5 m downstream of IP assuming proton and electron orbits are in horizontal plane at IP • x = 250 mm, y = -8.9 mm, px/p = 0.050, py/p = -0.0024

  8. Correcting Orbit Distortion • Important to correct vertical offset and angle to make the orbit flat in the ring • Tricky because no space for corrector dipoles between IP and downstream FFB • Suggested solution: • Rotate the interaction plane by a certain angle around the solenoid axis • Rotate the spectrometer dipole around its axis by a certain angle • Other options • Let the ion orbit shift inside the FFB quads and correct it downstream • Install FFB quads at an angle to keep the distorted orbit centered • Make the spectrometer dipole a few independent dipoles used as correctors • Shift the IP • ?? • Combination of some of the above options

  9. Suggested Solution • Was shown in simulations to correct the vertical orbit distortion for 60 GeV/c protons with 50 mrad crab crossing angle but should work in general • The spectrometer dipole is modeled as a 1 m long box with 2 T uniform vertical field • The rotation angles are first obtained analytically and then checked in simulation • The required rotation of the interaction plane around the solenoid axis is 36.8 mrad • Can be done by corrector dipoles in front of the solenoid where there is space • The required spectrometer dipole rotation around its axis is -57.7 mrad • Perhaps can be implemented without mechanical rotation by using additional coil windings in the dipole to rotate the field • Dipole axis lies in horizontal plane • For the dipole model used, the correction is not sensitive to the dipole axis alignment in horizontal plane • In the solenoid model used, the solenoidal fringe field extends into the dipole and was not taken into account when calculating the correction, therefore there is a small effect from the fringe field, field maps should be used for more accurate simulations

  10. Corrected Orbit

  11. Final Focusing Block • Distance from the IP to the first quad = 7 m • Quadrupole lengths: L1 = L2 = L3 = 1.5 m • Quad strengths @ 100 GeV/c: Q1 = -64.1 T/m, Q2 = 64.5 T/m, Q3 = -17.0 T/m

  12. Tracking through FFB

  13. FFB Acceptance Study • 60 GeV/c proton beam originates at the interaction point • Beam particles uniformly distributed within a horizontal (vertical) angle of 1 around the beam trajectory and p/p of 0.7 • Quad aperture radii = 10 cm  6 T / (field gradient @ 100 GeV/c) • Particles that pass through the FFB shown in blue

  14. Optimized FFB • Distance from the IP to the first quad = 7 m • Quadrupole lengths: L1 = 1.2 m, L2 = 2.4 m, L3 = 1.2 m • Quad strengths @ 100 GeV/c: Q1 = -79.7 T/m, Q2 = 41.3 T/m, Q3 = -23.6 T/m Pawel Nadel-Turonski & Alex Bogacz

  15. Tracking through Optimized FFB • Each quad aperture = B max / (field gradient @ 100 GeV/c)

  16. Optimized 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

  17. 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

  18. Complete System • 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 • FFB • Big spectrometer dipole • 4 m downstream of the FFB, sector bend, 3.5 m long, 60 mrad bending angle, 20 cm square aperture

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

  20. System Acceptance for p/p = -0.5 • Protons with p/p = -0.5 uniformly distributed within 1 horizontal & vertical angles around the nominal 60 GeV/c proton beam trajectory • Each quad aperture = 6 T / (field gradient @ 100 GeV/c)

  21. System Acceptance for p/p = 0.0 • Protons with p/p = 0.0 uniformly distributed within 1 horizontal & vertical angles around the nominal 60 GeV/c proton beam trajectory • Each quad aperture = 6 T / (field gradient @ 100 GeV/c)

  22. System Acceptance for p/p = +0.5 • Protons with p/p = +0.5 uniformly distributed within 1 horizontal & vertical angles around the nominal 60 GeV/c proton beam trajectory • Each quad aperture = 6 T / (field gradient @ 100 GeV/c)

  23. Transverse Coordinates for p/p = -0.5 • 30 GeV/c protons, each quad aperture = 6 T / (field gradient @ 100 GeV/c) • Blue: within cone with polar angle < 0.25; green: 0.25 <  < 0.5;red:  > 0.5 At the entrance into the big dipole At the exit from the big dipole

  24. Transverse Coordinates for p/p = 0.0 • 60 GeV/c protons, each quad aperture = 6 T / (field gradient @ 100 GeV/c) • Blue: within cone with polar angle < 0.25; green: 0.25 <  < 0.5;red:  > 0.5 At the entrance into the big dipole At the exit from the big dipole

  25. Transverse Coordinates for p/p = +0.5 • 90 GeV/c protons, each quad aperture = 6 T / (field gradient @ 100 GeV/c) • Blue: within cone with polar angle < 0.25; green: 0.25 <  < 0.5;red:  > 0.5 At the entrance into the big dipole At the exit from the big dipole

  26. Separation of Electron and Ion Beams

  27. 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

  28. 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

  29. 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

  30. 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

  31. 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

  32. 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

  33. 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

  34. 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

  35. 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

  36. 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| > N/A @ p/p = 0 |x| > 3 mrad @ p/p = 0

  37. Future Plans 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. Hybrid permanent / electro magnet electron FFB design? (Pawel Nadel-Turonski & Alex Bogacz) Evaluation of the engineering aspects, such as magnet parameters, electron and ion beam line separation, etc.

More Related