optimizing ir design for lhc luminosity upgrade
DESCRIPTION
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 - PowerPoint PPT PresentationTRANSCRIPT
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– ~12 m providing transverse size <30 cm dia.
• Develop designs for quads, dipoles that can tolerate high radiation, high heat
Preliminary IR
Q1 is in harm’s way, but moving closer actually reduces losses
D1
Q1
Multiplicity ~ f() e-bt Eparticle ~ pt /
So energy flow concentrates strongly down the beam direction.
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
Ironless Quadrupole for Q1
316 T/m
6 K supercritical cooling
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)
D1: levitated-pole dipole
Cold iron pole piece, warm iron flux return.
Cancel Lorentz forces on coils, pole steel.
8.7 T
4.5 K
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!