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Aperture for AFP, ALICE, and LHCb (LHC)

Aperture for AFP, ALICE, and LHCb (LHC). M. Giovannozzi Acknowledgements: H. Burkhardt , B. Holzer , D. Macina , M. A. Gallilee , J. Jowett, G. Spigo. Disclaimer: unless otherwise stated, nominal parameters are used. AFP layout - I. AFP layout - II. Layout provided by G. Spigo .

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Aperture for AFP, ALICE, and LHCb (LHC)

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  1. Aperture for AFP, ALICE, and LHCb (LHC) M. Giovannozzi Acknowledgements: H. Burkhardt, B. Holzer, D. Macina, M. A. Gallilee, J. Jowett, G. Spigo Disclaimer: unless otherwise stated, nominal parameters are used. MG - LEB meeting

  2. AFP layout - I MG - LEB meeting

  3. AFP layout - II • Layout provided by G. Spigo. • Defined maximum aperture markers for MAD-X model: • Mechanical tolerances equal to those of neighbouring magnetic elements, i.e., 0.84 mm radial, 0.36 mm horizontal. • Aperture definition: maximum rectangle inscribed into real aperture shape. • Defined installation of markers for Beam 1 and Beam 2 elements. • Defined offset files. • No change in position between injection and top energy. • All files (and sample job) available under afs at ~giovanno/public/For_AFP MG - LEB meeting

  4. AFP aperture: results - I b*=11 m q=170 mrad Sep=2 mm MG - LEB meeting

  5. AFP aperture: results - II b*=0.55 m q=142.5 mrad Sep=0.5 mm MG - LEB meeting

  6. Alice beam pipe - I • New layout before LS2: certified (by M. A. Gallilee) nominal layout. • New layout after LS2: certified (by M. A. Gallilee) proposed layout. • S-dependent tolerances have been introduced for both layouts. • Several configurations considered: • Nominal injection • Nominal collision – proton physics • Nominal squeezed - ion physics MG - LEB meeting

  7. Alice beam pipe - II MG - LEB meeting

  8. Alice aperture: results - I • R = 17.2 mm, tol. = 5.1 mm -> n1 = 4.1 s • R = 19.2 mm, tol. = 5.1 mm -> n1 = 8.4 s b*=10 m qext=170 mrad Sep=2 mm MG - LEB meeting

  9. Alice aperture: results - II b*=10 m qtotal=88 mrad Sep=0.5 mm b*=0.6 m qtotal=150 mrad Sep=0.7 mm MG - LEB meeting

  10. LHCb beam pipe - I • New layout before LS2: certified (by M. A. Gallilee) nominal layout. • New layout after LS2: certified (by M. A. Gallilee) proposed layout. • S-dependent tolerances have been introduced for both layouts. • Several configurations considered: • Nominal injection • Nominal collision – proton physics • Nominal squeezed – proton physics MG - LEB meeting

  11. LHCb beam pipe - II MG - LEB meeting

  12. LHCb aperture: results - I b*=10 m qext=170 mrad Sep=2 mm MG - LEB meeting

  13. LHCb aperture: results - II b*=10 m qtotal=370 mrad Sep=2 mm b*=3 m qtotal=265 mrad Sep=0.7 mm MG - LEB meeting

  14. Conclusions for nominal LHC - I • AFP • Current proposal is compatible with aperture requirements. It is also compatible with high-beat optics. • Further aperture restrictions (installation of Ferrites) should be re-evaluated. • Compatibility between AFP and ALFA should be carefully assessed. • The AFP area will be completely changed in the HL-LHC era. • Alice • Too small aperture at injection beyond -2 m from IP! • High-beta optics not considered: it will enhance the aperture problems. • Top energy configurations are fine. • LHCb • No specific problems found. • V-crossing at top energy with b*=3 m considered: no problem found • All the files for Alice and LHCb are available under • /afs/cern.ch/eng/lhc/optics/V6.503/aperture: nominal beam pipe • /afs/cern.ch/eng/lhc/optics/V6.503/aperture/as-built: upgraded beam pipe Any feedback is more then welcome! MG - LEB meeting

  15. Conclusions for nominal LHC - II An important remark: the running conditions after LS2 are not completely defined (or at least known to me). An exhaustive analysis is therefore not possible, to date. MG - LEB meeting

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