CERN Accelerating science

Article
Report number FERMILAB-CONF-14-450-AD-APC ; arXiv:1411.4580 ; FERMILAB-CONF-14-450-AD-APC
Title Measurements of beam halo diffusion and population density in the Tevatron and in the Large Hadron Collider
Author(s) Stancari, Giulio (Fermilab)
Publication 2015-03
Imprint 17 Nov 2014
Number of pages 5
Note Comments: 5 pages, 1 figure, 1 table. Submitted to the Proceedings of the 54th ICFA Advanced Beam Dynamics Workshop on High-Intensity and High-Brightness Hadron Beams (HB2014), East Lansing, MI, USA, November 10-14, 2014
5 pages, 1 figure, 1 table. Submitted to the Proceedings of the 54th ICFA Advanced Beam Dynamics Workshop on High-Intensity and High-Brightness Hadron Beams (HB2014), East Lansing, MI, USA, November 10-14, 2014
In: 54th ICFA Advanced Beam Dynamics Workshop on High-Intensity, High Brightness and High Power Hadron Beams, East-Lansing, USA, 10 - 14 Nov 2014, pp.WEO3AB01
Subject category Accelerators and Storage Rings
Accelerator/Facility, Experiment CERN LHC
Fermilab Tevatron
Abstract Halo dynamics influences global accelerator performance: beam lifetimes, emittance growth, dynamic aperture, and collimation efficiency. Halo monitoring and control are also critical for the operation of high-power machines. For instance, in the high-luminosity upgrade of the LHC, the energy stored in the beam tails may reach several megajoules. Fast losses can result in superconducting magnet quenches, magnet damage, or even collimator deformation. The need arises to measure the beam halo and to remove it at controllable rates. In the Tevatron and in the LHC, halo population densities and diffusivities were measured with collimator scans by observing the time evolution of losses following small inward or outward collimator steps, under different experimental conditions: with single beams and in collision, and, in the case of the Tevatron, with a hollow electron lens acting on a subset of bunches. After the LHC resumes operations, it is planned to compare measured diffusivities with the known strength of transverse damper excitations. New proposals for nondestructive halo population density measurements are also briefly discussed.
Copyright/License arXiv nonexclusive-distrib. 1.0
publication: (License: CC-BY)



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