Beam diffusion measurements using collimator scans in the LHC
Citations Over TimeTop 14% of 2013 papers
Abstract
The time evolution of beam losses during a collimator scan provides information on halo diffusion and population. This is an essential input for machine performance characterization and for the design of collimation systems. Beam halo measurements in the CERN Large Hadron Collider were conducted through collimator scrapings in a dedicated beam study for the first time at 4 TeV. Four scans were performed with two collimators, in the vertical plane for beam 1 and horizontally for beam 2, before and after bringing the beams into collisions. Inward and outward steps were performed. A diffusion model was used to interpret the observed loss rate evolution in response to the collimator steps. With this technique, diffusion coefficients were estimated as a function of betatron oscillation amplitude from approximately 3 to 7 standard deviations of the transverse beam distribution. A comparison of halo diffusion and core emittance growth rates is also presented.
Related Papers
- → Beam collimation for CSNS/RCS(2010)4 cited
- → Overranging and overbeaming measurement in area detector computed tomography: A method for simultaneous measurement in volume helical acquisition(2019)18 cited
- Collimator with shed cover for forming the beam of electrons of the B5M-25 betatron(1973)
- → New Post-Linac Collimation System for the Next Linear Collider(LCC-0052)(2003)
- Beam collimation for CSNS/RCS(2010)