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Optimizing IR Design for LHC Luminosity Upgrade

This study focuses on optimizing the IR insertion for the LHC luminosity upgrade. The goal is to maximize gradients, reduce aperture, and develop designs for quadrupoles and dipoles that can tolerate high radiation and heat. Collaborators are needed for this work in progress.

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Optimizing IR Design for LHC Luminosity Upgrade

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  1. Optimizing IR Design for LHC Luminosity Upgrade Peter McIntyre and Akhdiyor Sattarov Texas A&M University

  2. To optimize an IR insertion:makes the lenses strong put them close to the IP • Maximize gradients in quad triplet • Move Q1 as close as possible, reduce aperture • Q1 shadows Q2, Q3 • Inquire with experiments how close to go • ~12 m providing transverse size <30 cm dia. • Eliminate shield wall to save 2 m? • Develop designs for quads, dipoles that can tolerate high radiation, high heat

  3. Preliminary IR

  4. Accommodate Q1 and Koutchuk’s D0 in CMS D0 Q1

  5. Design Q1 using structured cable 6-on-1 cabling of Nb3Sn strand around thin-wall inconel X750 spring tube Draw within a thicker inconel 718 jacket Interior is not impregnated – only region between cables in winding Volumetric cooling to handle volumetric heating from particle losses

  6. Ironless Quadrupole for Q1 340 T/m, 40 mm aperture Good field quality 46 K supercritical cooling Expect to tolerate >50 W/m ~40 cm cold mass diameter

  7. Control flux return size using NbTi trimExample: active shielding 24 T LHC Tripler dipole NbTi trim windings Field strength on steel boundary, full field: 100 G max 5 cm from surface without fringe trim with fringe trim 00 900 Steel flux plate  dipole boundary condition  suppress persistent current multipoles, snap-back

  8. Q2, Q3: push gradient usingblock-coil Nb3Sn quadrupoles 450 T/m @ 2 K superfluid cooling 50 mm aperture ~70 mm cold mass diameter

  9. D1: levitated-pole dipole 8.7 T 4.5 K Cold iron pole piece, warm iron flux return. Cancel Lorentz forces on coils, pole steel.

  10. This approach to IR elements opens new opportunities to optimizes IR optics Comparison to baseline IR: Reduce * Reduce # of subsidiary bunch crossings Reduce sensitivity to error fields and placements Open space for another doublet to fully separate corrections in x, y. This is a work in progress. I need collaborators!

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