LHC Beam Operation Workshop - Evian 7-9 December 2010

Session

Session 5: Beam losses

8 Dec 2010, 16:30

Hilton, Evian

Description

Chair: Ralph Assmann. Scientific secretary: Stefano Redaelli

Presentation materials

Discussion Summary

S05_discussion.pdf

S05_discussion.ps

S05_discussion.tex

14. Multi-turn losses and cleaning

D. Wollmann

08/12/2010, 16:30

In the LHC all multi-turn losses should occur at the collimators in the cleaning insertions. The cleaning inefficiency (leakage rate) is the figure of merit to describe the performance. In combination with the quench limit of the superconductive magnets and the instantaneous life time of the beam this defines the cleaning dependent beam intensity limit of the LHC. In addition, limits can arise...

15. Injection/extraction losses

W. Bartmann

08/12/2010, 17:00

Single pass losses at injection into LHC and extraction to the beam dump are distinguished regarding their origin. Potential mitigations as increasing the opening of the injection protection devices or temporarily blinding the BLM system at injection are discussed. The limits for injecting higher intensities in 2011 due to losses above BLM thresholds together with the risk for quenching...

16. Losses away from collimators: statistics and extrapolation

E.B. Holzer

08/12/2010, 17:30

The Beam Loss Monitors (BLMs) in long straight sections and the dispersion suppressors being covered in the following talk, this presentation focuses on beam losses in the LHC arcs. The main task of the approximately 2200 arc monitors is quench prevention. The arcs are generally very well protected by the collimators. The aim of this talk is to search for possible holes in this protection, and...

17. BLM thresholds: limiting locations

A. Nordt

08/12/2010, 17:50

Around 4000 Beam Loss Monitors are installed around the LHC ring and they must detect dangerous beam losses which could quench the superconducting magnets or damage components of the accelerator. The LHC BLM system was working very well during the 2009 and 2010 run. All dangerous beam losses have been detected by the system and the beam dump was always initiated correctly so that no damage...

18. General discussion

08/12/2010, 18:10