1 / 10

Beam parameters for 5 TeV operation in 2008

Detailed analysis and assumptions for optimizing beam parameters at 5 TeV operation in 2008, covering aperture, luminosity, and target parameters for efficient collider performance.

atimothy
Download Presentation

Beam parameters for 5 TeV operation in 2008

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. Beam parameters for 5 TeV operation in 2008 • General assumptions • Aperture • Luminosity • Overall target parameters • Next steps • Acknowledgements: E. Chapochnikova, W. Herr, J. Tuckmantel M. Giovannozzi LHCCWG - April 8th 2008

  2. General assumptions - I • The analysis is based on the general parameters for Phase A. • In particular, no crossing angle is assumed and the same values for beta*. • Longitudinal parameters: • Nominal at 7 TeV • Emittance: 2.5 eVs (due to blow-up) • Bunch length: 7.55 cm • Rms energy spread: 1.13 ×10-4 • At 5 TeV one can assume the same values. However… LHCCWG - April 8th 2008

  3. General assumptions - II • The hardware for generating the longitudinal blow-up will not be ready for the commissioning. • Hence, emittance will be of the order of 1 eVs even at top energy. • The corresponding set of beam parameters (5 TeV or 7 TeV) will have to be defined (discussions with Elena on-going). LHCCWG - April 8th 2008

  4. Aperture - I 7 TeV Aperture in IR1 at top energy with beta*=2 m and no crossing angle 5 TeV LHCCWG - April 8th 2008

  5. Aperture - II IR8. Spectrometer at 7 TeV value Aperture in IR2 and 8 at 5 TeV with beta*=10 m and 2 m, respectively. No external crossing angle IR2. Spectrometer at 7 TeV value LHCCWG - April 8th 2008

  6. Aperture - III Summary of aperture bottleneck at 5 TeV Aperture in IR5 at 5 TeV with beta*=2 m. No crossing angle LHCCWG - April 8th 2008

  7. Aperture - IV • Some additional remarks: • Werner analysed in details the situation with the external crossing angle for IR8. Down to beta*=2 m aperture and separations are enough until bunch spacing of 50 ns. • Simulations concerning aperture vs. beam energy with • beta* as from Phase A • No crossing angle • Constant separation bump LHCCWG - April 8th 2008

  8. Luminosity • Target values depend on bg • Re-scale values from Phase A by 0.71. • Luminous region: • Assuming same longitudinal parameters, then it re-scales with respect to the nominal case by 0.71. • Nominal case: • The final result depends on the value of the longitudinal parameters LHCCWG - April 8th 2008

  9. Overall target parameters • First iteration on target parameters made (43 and 156 bunches). • Finalisation once the longitudinal parameters will be fixed. • Also the table for the synchrotron radiation effects will need to be updated. LHCCWG - April 8th 2008

  10. Next steps • Define longitudinal parameters • Re-evaluate the global set of beam parameters • Evaluate the situation concerning the radiation damping • However, the optics configuration is already available from the official LHC web site http://lhc.web.cern.ch/lhc/ LHCCWG - April 8th 2008

More Related