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Muon Collider Machine-Detector Interface

This text detailed innovations in Muon Collider MDI design, with advanced physics, detector interface, and machine specs discussed. Learn about optimized tungsten masks, detailed magnet designs, and advanced source term files. Discover the latest technological breakthroughs shaping the future of accelerator physics.

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Muon Collider Machine-Detector Interface

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  1. Fermilab Accelerator Physics Center Muon Collider Machine-Detector Interface MAP 2012 Winter Meeting SLAC March 4-8, 2012 Nikolai Mokhov Fermilab

  2. MDI Plans (Telluride, June 2011) and Status • Generate new √S = 1.5 TeV source term files with • new mask/liner/spacer configuration at ±200 m • Model is up and running but decided to change magnet design • updated MARS15 with no weight variation for low-energy n, g and e • Eth = 0.001 eV (n), 1 keV (other particles including e & g, just finished with EMS) • 1 to 10 full bunch crossings • Same for √S =3 TeV latticeto be released by Y. Alexahin • In detector response modeling focus on time gating and double-layer tracker, calorimeter and event reconstruction in presence of updated backgrounds Muon Collider MDI - N.V. Mokhov

  3. MARS15 Model -100 < s < 100 m Muon Collider MDI - N.V. Mokhov

  4. -30 < s < 30 m Muon Collider MDI - N.V. Mokhov

  5. MARS Detector & MDI Tight tungsten masks between and liners inside all magnets, dipole component in quads Optimized tungsten nozzle: 10 deg at 6-100 cm 5 deg at 100-600 cm Rin = 0.36 cm at z=100 cm BCH2 cladding Sophisticated shielding: W, iron, concrete & BCH2 Muon Collider MDI - N.V. Mokhov

  6. MDI Team • Lattice design: Y. Alexahin • Magnet design: V.V. Kashikhin, I. Novitski, A. Zlobin • MDI design and MARS15 modeling: N. Mokhov, S. Striganov, I. Tropin, plus Muons Inc. G4beamline activity • ILCroot detector modeling: V. Di Benedetto, C. Gatto, A. Mazzacane, N. Terentiev • Physics feedback and lcsim startup: E. Eichten, N. Graf, R. Lipton, A. Para, H. Wenzel Muon Collider MDI - N.V. Mokhov

  7. Energy Deposition in IR Dipoles Dynamic heat load:200 W/m in W-rods, and 245 W/m in cold mass Muon Collider MDI - N.V. Mokhov

  8. m+ Beam Decays Horizontal Magnet local coordinate system Ring outside Muon Collider MDI - N.V. Mokhov

  9. Dipole and Tungsten Mask 2×4cm L=20cm, R=15cm Albedo trap in water-cooled W-rods; two 3×30mm AlBemet spacers Muon Collider MDI - N.V. Mokhov

  10. Ring Quadrupole 7.5-mm W liner Muon Collider MDI - N.V. Mokhov

  11. Five m- decays at 3 – 23 m: “Good” Muon Collider MDI - N.V. Mokhov

  12. Five m- decays at 3 – 23 m: “Bad” Muon Collider MDI - N.V. Mokhov

  13. Five m- decays at 3 – 23 m: “Ugly” Muon Collider MDI - N.V. Mokhov

  14. Source Term to Feed Detector Simulations • High-statistics files of particles • entering the detector black hole: • Two 0.75-TeV beams • Minimal or no variation of weights • Eth = 200 keV and 1 keV (new) • TOF and full origin info • Two groups (with external • weight w0): • ±25m, 0.5 M decays, w0=23 • ±(25-190)m, 24 M decays, w0<<1 MARS15 calculated source term at the MDI interface surface to feed detector simulation groups Muon Collider MDI - N.V. Mokhov

  15. Main Features: Origin in Lattice (1) The origin of all particles (except BH muons) entering the detector is the straight section of about ±2 to ±25 m near the IP with a broad maximum from 6 m (back of nozzle) to 17 m (IP side of the first dipole). Muon Collider MDI - N.V. Mokhov

  16. Source Tagging Muon Collider MDI - N.V. Mokhov

  17. Main Features: Origin in Lattice (2) • This is the combined effect of • Angular divergence of secondary particles • Strong magnetic field of dipoles in IR • Tight tungsten masks • Good performance of optimized nozzles • Confinement of decay electrons in the aperture (inside detector), forcing them to hit the nozzle on the opposite side of IP Muon Collider MDI - N.V. Mokhov

  18. Source Tagging: Bethe-HeitlerMuons 90% from ±100m Muon Collider MDI - N.V. Mokhov

  19. Longitudinal Distributions of Entry Points m+ beam Maxima at abs(z)<1.5m: thinnest shielding Muon Collider MDI - N.V. Mokhov

  20. Particle Fluence in Horizontal Plane at z=0 Ring outside Muon Collider MDI - N.V. Mokhov

  21. MARS15 Developments Since Telluride (1) • 95% finished planned massive developments of newest MARS15. It has a lot of improvements, extensions and new features. Snapshot of new features: • Driven by Muon Collider detector needs and to improve description of low-energy electromagnetic physics, EGS5 code was implemented in MARS15 for electrons and photons below 20 MeV; as a result their minimal cutoff energy can now be as low as 1 keV (compared to previous 200 keV), same as for charged hadrons, muons and heavy ions (minimal neutron energy is 0.001 eV). • Improved modeling of dE/dx and DPA for all particles at 1 keV to 100 TeV in elements and mixtures. • Work in progress on hadron-nucleus event generators at intermediate energies (1 – 8 GeV) and at E0 < 30 MeV. Muon Collider MDI - N.V. Mokhov

  22. EMS in Be at 5 and 0.5 MeV Muon Collider MDI - N.V. Mokhov

  23. EMS in Cu at 5 and 0.5 MeV Muon Collider MDI - N.V. Mokhov

  24. EMS in Si for 30, 40 and 50 keV Electrons * Werner et al. (1988) Muon Collider MDI - N.V. Mokhov

  25. MARS15 Developments Since Telluride (2) • Powerful ROOT geometry option with beamline mode and 3D visualization. • No. of regions increased from 1.e5 to 2.e5 (driven by ANSYS and detector applications). • No. of materials in a given run increased from 100 to 500. • NMAT and old MATR cards as well as MIXTURE routine disappeared;materials definitions were moved from MARS.INP to a materials file; its name can now be defined in MARS.INP on a new MATR card, e.g.MATR 'MATER_Mu2e_PS.INP' (default name is MATER.INP);user-defined materials are now specified in that materials file. • ENDF (MCNP) materials definitions will be generated automatically inside the code. Muon Collider MDI - N.V. Mokhov

  26. ROOT Geometry in MARS15 Muon Collider MDI - N.V. Mokhov

  27. MARS15 Developments Since Telluride (3) • No. of elements in a composite material increased from 20 to 30 • Stopped nuclide scoring (crucial for tiny objects) added in addition to their production rates • DeTra module for decay and transmutation of nuclides integrated to the main code • No. of materials with detailed info on nuclides and for DeTra in a given run increased from 20 to 40 • In addition, substantial developments on physics/background detector simulation: new version of ILCRoot with double-layer geometry, refined timing definition, and impressive results (see talk by N. Terentiev) Muon Collider MDI - N.V. Mokhov

  28. Timing for Vertex and Tracker Detector Hits MARS Load ILCRoot Hits Timing is a powerful tool to reject backgrounds escaping sophisticated MDI and entering VTX and tracker See N. Terentiev’s talk Muon Collider MDI - N.V. Mokhov

  29. Background Hits in VTX and Tracker Barrels }MC at 1034 cm-2 s-1 CMS at 1034 cm-2 s-1 and √S = 14 TeV Muon Collider MDI - N.V. Mokhov

  30. MDI Plans for the Rest of FY12 • Arrive at consistent cos-theta designs for IR dipoles and combined-function quadrupoles • Implement them in the newest MARS15, perform test runs and first optimizations of inner absorbers and masks • Full MARS runs for backgrounds at the MDI interface • Perform timing and double-layer rejection studies with this new source term and latest ILCRoot version; compare this with lcsim once available • Agree on a “full-bunch” model and launch production runs • 3-TeV activities in parallel Muon Collider MDI - N.V. Mokhov

  31. New 3-TeV Lattice Yu. Alexahin Muon Collider MDI - N.V. Mokhov

  32. Details in the 30-m region Yu. Alexahin Muon Collider MDI - N.V. Mokhov

  33. Cos-theta Dipole with Asymmetric Absorber Field quality and stress problems in the open-midplane dipole are extremely difficult to mitigate. Dynamic heat loads are still too high. Therefore, switch to a classical Cos-theta large-aperture design with an asymmetric absorber inside To be optimized Expect background reduction! Muon Collider MDI - N.V. Mokhov

  34. Combined-Function IR Quadrupoles Nb3Sn HTS Nb3Sn HTS • Dbore = 150 mm, Bq = 9.9 T, Gq = 70.1 T/m Dbore = 150 mm, Bq = 10.3 T, Gq = 89.8 T/m 2-T dipole field to facilitate chromaticity correction and dilute decay electron fluxes on the detector with large aperture to accommodate tungsten absorber Expect background reduction! Muon Collider MDI - N.V. Mokhov

  35. MDI FY13 Work Plan • Conceptual design of 3 TeV IR magnets and shields • Update ILCroot/lcsim detector models for 3 TeV • Detailed MARS model of 3 TeV MDI region • MARS 3 TeV production runs for energy deposition & backgrounds • Physics/backgrounds detector simulation with this source • Revisit/study offsite neutrino-induced radiation Muon Collider MDI - N.V. Mokhov

  36. MDI FY14 Work Plan • MARS optimization simulations to further reduce energy deposition and detector backgrounds • In iterations with detector group, evaluate if physics goals can be achieved • MARS energy deposition, background and radiation studies for a conceptual design of collimation system Muon Collider MDI - N.V. Mokhov

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