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Twin Solenoid & Dipoles, update - FCC detector meeting, 16/9/15 -

Twin Solenoid & Dipoles, update - FCC detector meeting, 16/9/15 -. Matthias Mentink for FCC-hh Detector Magnets Working Group. Geometry overview Magnetic properties and Field integrals Conclusion & Outlook. Overall Geometry: Cold Mass. Force and torque neutral dipole. Twin Solenoid: Spokes.

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Twin Solenoid & Dipoles, update - FCC detector meeting, 16/9/15 -

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  1. Twin Solenoid & Dipoles, update- FCC detector meeting, 16/9/15 - Matthias Mentink for FCC-hh Detector Magnets Working Group Geometry overview Magnetic properties and Field integrals Conclusion & Outlook

  2. Overall Geometry: Cold Mass Force and torque neutral dipole Twin Solenoid: Spokes • Full pseudo-rapidity coverage: Twin Solenoid for low-η particles, dipoles for high-η particles • Force & Torque neutral twin solenoid through cold spokes, force & torque neutral dipoles through lateral compensation coils • Acting shielding  ‘Peanut-shaped’ 5mT boundary: RZ=0 = 32 m, RWidest = 35 m, ZR=0 = 57 m • Total mass: 6 kt (Twin Solenoid) + 2 x 0.5 kt (Dipoles) = 7 kt Twin Solenoid: Inner solenoid Dipole lateral coils Dipole main coils Twin Solenoid: Outer solenoid

  3. Twin Solenoid Geometry: Cold Mass 16 12 8 4 0 B [T] 9.7 m OR = 13.5 m 6 5 4 3 2 1 0 IR = 13 m • (Preliminary) Conductor & support structure composition: aluminium dominated • Conceptual design optimized for low mass  high stress & strain • Coil thickness and overall weight may increase 2.8 T OR = 7.1 m Radial Position R [m] 19.9 m IR = 6.25 m 6 T -12 -8 4 0 4 8 12 Axial position Z [m]

  4. Twin Solenoid Geometry: Vacuum Vessel • Vacuum vessel surrounds cold mass, with typical vacuum vessel thickness: 0.25 – 0.4 m (+ localized reinforcement) • Consists of stainless steel, mass: 2.4 kt • Bore tube (surrounds 12 m free bore) can support up to 15 kt of detector mass, with peak deflection: ~15 mm

  5. Force & Torque Neutral Dipole Geometry Dipole main coil Dipole lateral coils • Dipole: Magnetic field oriented in y direction, field integral: 10 Tm • Conical shape, free bore coverage: η = 2.5 • Mean free bore: 6 m, length: 6 m • Lateral coils: For force & torque balancing and stray field reduction

  6. Magnetic field lines • Shown here: Magnetic field lines in YZ plane • Dipole polarity: Up & down configuration

  7. Field integrals: Twin Solenoid only η = 0 η = ∞ • Twin solenoid field integrals: • 36 Tm inside 12 m free bore at η = 0 • 15 Tm between inner and outer solenoid vacuum vessels at η = 0 • 0 Tm at η = ∞

  8. Field integrals: Dipoles only ~ 1.5 T in main coil center ~ 4 T in lateral coil center • Dipole field integrals: • 10 Tm for η > 2.5 • Complex field map for η < 2.5 • Peak field on conductor: 6.0 T

  9. Conclusion & Outlook • Summary: • Twin solenoid + dipoles featuring full η coverage • Preliminary design: Twin Solenoid (53 GJ, 6 kt) • + Force & torque neutral dipoles (2 x 1.5 GJ, 0.5 kt) • To be investigated: • Conductor technology • Reduction in outer radius • Influence of magnetic properties of HCAL • And many details… For details on mechanical properties, thermal behaviour etc: Mentink et al., IEEE Trans. on Appl. Supercond. 2015 (to be published, preprint available now)

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