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Optimizing IR Design for LHC Luminosity Upgrade

Optimizing IR Design for LHC Luminosity Upgrade. Peter McIntyre and Akhdiyor Sattarov Texas A&M University. To optimize an IR insertion: makes the lenses strong put them close to the IP. Maximize gradients in quad triplet Inquire with experiments how close to go

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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 • Inquire with experiments how close to go • ~12 m providing transverse size <30 cm dia. • Develop designs for quads, dipoles that can tolerate high radiation, high heat

  3. Preliminary IR

  4. Q1 is in harm’s way, but moving closer actually reduces losses Q1 D1 Multiplicity ~ f() e-bt Eparticle ~ pt / So energy flow concentrates strongly down the beam direction.

  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 316 T/m 6 K supercritical cooling

  7. Q2, Q3: push gradient usingblock-coil Nb3Sn quadrupoles 334 T/m @6 K supercritical cooling (no iron) 390 T/m @2 K superfluid cooling (w/iron)

  8. 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.

  9. 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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