LHC-CC10, 4th LHC Crab Cavity Workshop

Session

Optics & Beam Physics Aspects

15 Dec 2010, 10:30

6/2-024 - BE Auditorium Meyrin (CERN)

17. Upgrade optics with crab cavities

Riccardo De Maria (CERN)

15/12/2010, 10:30

Review of the main LHC optics constraints. New flexible upgrade optics and its beta* reach. Possible LHC baseline layout wtih crab cavities. Choice of beta*'s and crossing angle with local crab cavities. Optics consistency check and chromatic correction scheme. Potential crab cavity locations and the crab voltage required. Longitudinal space constraints. Transverse mechanical aperture...

33. Effect of non-zero dispersion

Prof. Georg Hoffstaetter (Cornell University, LEPP)

15/12/2010, 10:50

Effect of non-zero dispersion for a local crab crossing scheme for the LHC is considered and its impact on stable working point in the presence of crab cavities is analysed. The maximum allowed dispersion (and slope of dispersion?) at the crab-cavity is estimated. Effects of higher order optical aberrations and RF curvature, and their impact on the IR region optics and working point are also...

19. Impedance effects during injection, energ ramp & store

Elena Chapochnikova (CERN)

15/12/2010, 11:10

Review of longitudinal and transverse impedance budgets for the LHC energy cycle. Assessment of crab-cavity impedance spectrum for LHC compatibility.

20. Luminosity leveling with crabs

Guido Sterbini (CERN BE-ABP)

15/12/2010, 11:30

Concept of lumonisity leveling and the effect of luminosity leveling with crab cavities at ultimate bunch intensities. The use of crab cavities for smaller than nominal emittances for operation with total beam-beam tune shifts of 0.02 to 0.03.

34. Very large crossing angle & magnet technology

Dr Ezio Todesco (CERN)

15/12/2010, 11:50

Assuming a successful implementation of the crab scheme with the current IR focusing layout, a future outlook with concepts and associated challenges for the magnet technology to devise independent focusing channels at the IRs for the two beams with larger-angle crab crossing. This could alleviate long range beam-beam problems and enable easier optics solutions for reducing beta*.