1 / 15

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 .

price-noble
Download Presentation

Aperture for AFP, ALICE, and LHCb (LHC)

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  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

More Related