Experimental Interaction Region Optics for the High Energy

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Experimental Interaction Region Optics for the High Energy LHC Leon van Riesen-Haupt, J. Abelleira,

Experimental Interaction Region Optics for the High Energy LHC Leon van Riesen-Haupt, J. Abelleira, E. Cruz-Alaniz, P. Mirave, A. Seryi, JAI Oxford M. Crouch, M. Hofer, J. Keintzel, R. Tomas, F. Zimmermann, CERN

Experimental Interaction Region • Need a new triplet for the final focus L More

Experimental Interaction Region • Need a new triplet for the final focus L More rigid beam L Increase in debris J FCC Nb. Sn technology • Separation dipoles L More rigid beam L Less space J FCC Nb. Sn technology • Space for crab cavities • Matching section L More rigid beam L Has to fit in LHC tunnel FCC Week 2018: Experimental Interaction Region Optics for the High Energy LHC 2

Algorithm Set total length and fix required beam stay clear, β*, L*, gaps and

Algorithm Set total length and fix required beam stay clear, β*, L*, gaps and shielding FCC Week 2018: Experimental Interaction Region Optics for the High Energy LHC 3

Algorithm Use fast FOM to scan large range in parameter space Find setup with

Algorithm Use fast FOM to scan large range in parameter space Find setup with largest beam stay clear If beam stay clear larger than required Plot ideal setup and output lengths + strengths FCC Week 2018: Experimental Interaction Region Optics for the High Energy LHC 4 If BSC smaller than required Increase total length Set total length and fix required beam stay clear, β*, L*, gaps and shielding

Optics-FLUKA interaction J. Abelleira Set required β*, L* and use initial shielding Integrate and

Optics-FLUKA interaction J. Abelleira Set required β*, L* and use initial shielding Integrate and match into machine for further studies Use code to find shortest setup with good beam stay clear Use this setup for radiation studies of triplet Change shielding accordingly Work out shielding required for this setup FCC Week 2018: Experimental Interaction Region Optics for the High Energy LHC 5

 New Triplet • Overall 8. 2 m longer than HL-LHC Triplet • Study

New Triplet • Overall 8. 2 m longer than HL-LHC Triplet • Study resulted in triplet with 2 cm shielding • Talk by J. Abelleira FCC Week 2018: Experimental Interaction Region Optics for the High Energy LHC 6

Aperture • FCC Week 2018: Experimental Interaction Region Optics for the High Energy LHC

Aperture • FCC Week 2018: Experimental Interaction Region Optics for the High Energy LHC 7

Dipoles • Less space for separation than LHC due to triplet • Larger separation

Dipoles • Less space for separation than LHC due to triplet • Larger separation than LHC – 205 mm vs. 194 mm • D 1 – Single aperture – Superconducting – 140 mm aperture – 11 T (challenging) • D 2 – Double aperture – Superconducting – 70 mm aperture – 7 T FCC Week 2018: Experimental Interaction Region Optics for the High Energy LHC 8

Crab Cavities • FCC Week 2018: Experimental Interaction Region Optics for the High Energy

Crab Cavities • FCC Week 2018: Experimental Interaction Region Optics for the High Energy LHC 9

Matching to Arc • SF SD FCC Week 2018: Experimental Interaction Region Optics for

Matching to Arc • SF SD FCC Week 2018: Experimental Interaction Region Optics for the High Energy LHC 10

Matching to Arc • Lack of flexibility in Dispersion suppressor – Geometry fixed from

Matching to Arc • Lack of flexibility in Dispersion suppressor – Geometry fixed from LEP – TWIS constrained by arc • Very dependant on rest of lattice including DS – Worked in V 0. 2 – Currently no solution in V 0. 3 – See talk by R. Tomas on lattice versions FCC Week 2018: Experimental Interaction Region Optics for the High Energy LHC 11

Injection Optics • FCC Week 2018: Experimental Interaction Region Optics for the High Energy

Injection Optics • FCC Week 2018: Experimental Interaction Region Optics for the High Energy LHC 12

Dynamic Aperture with Triplet Errors • Using V 0. 2 • Errors scaled from

Dynamic Aperture with Triplet Errors • Using V 0. 2 • Errors scaled from FCC • Added errors one by one – – No errors for reference Added a 3/b 3 errors Added a 4/b 4 errors Included all errors E. Cruz, M. Crouch FCC Week 2018: Experimental Interaction Region Optics for the High Energy LHC 13

Dynamic Aperture with Triplet Errors • E. Cruz, M. Crouch FCC Week 2018: Experimental

Dynamic Aperture with Triplet Errors • E. Cruz, M. Crouch FCC Week 2018: Experimental Interaction Region Optics for the High Energy LHC 14

Dynamic Aperture with Triplet Errors • E. Cruz, M. Crouch FCC Week 2018: Experimental

Dynamic Aperture with Triplet Errors • E. Cruz, M. Crouch FCC Week 2018: Experimental Interaction Region Optics for the High Energy LHC 15

Dynamic Aperture with Triplet Errors • FCC Week 2018: Experimental Interaction Region Optics for

Dynamic Aperture with Triplet Errors • FCC Week 2018: Experimental Interaction Region Optics for the High Energy LHC 16

IR 4 and Tuning • Doubled space for RF cavities • Added another pair

IR 4 and Tuning • Doubled space for RF cavities • Added another pair of quadrupoles for tuning P. Mirave FCC Week 2018: Experimental Interaction Region Optics for the High Energy LHC 17

IR 4 and Tuning • Doubled space for RF cavities • Added another pair

IR 4 and Tuning • Doubled space for RF cavities • Added another pair of quadrupoles for tuning – Allows one to change phase advance – No beating in cavities FCC Week 2018: Experimental Interaction Region Optics for the High Energy LHC 18

IR 4 and Tuning • Doubled space for RF cavities • Added another pair

IR 4 and Tuning • Doubled space for RF cavities • Added another pair of quadrupoles for tuning – Allows one to change phase advance – No beating in cavities • Large range of phase advance – Can be used as handle to increase DA – Aim to implement something similar in IR 6 FCC Week 2018: Experimental Interaction Region Optics for the High Energy LHC 19

Conclusion • FCC Week 2018: Experimental Interaction Region Optics for the High Energy LHC

Conclusion • FCC Week 2018: Experimental Interaction Region Optics for the High Energy LHC 20

Thank you! FCC Week 2018: Experimental Interaction Region Optics for the High Energy LHC

Thank you! FCC Week 2018: Experimental Interaction Region Optics for the High Energy LHC 21

Backup FCC Week 2018: Experimental Interaction Region Optics for the High Energy LHC 22

Backup FCC Week 2018: Experimental Interaction Region Optics for the High Energy LHC 22

Triplet Optimisation Thin Lens FOM • Precise MADX Scan FCC Week 2018: Experimental Interaction

Triplet Optimisation Thin Lens FOM • Precise MADX Scan FCC Week 2018: Experimental Interaction Region Optics for the High Energy LHC 23