315 research outputs found
Diagnostics needs for beam-beam studies and optimization
During the recent years of LHC operation, we analysed the situation of beam
instrumentation and the need to optimize it for beam-beam studies. The most
important beam instrumentation devices will be highlighted and modifications or
optimizations will be suggested. A complete wish list will be presented to make
sure we will be ready after LS1 (Long Shutdown 1) to study the beam-beam effect
in a more complete way.Comment: 3 pages, contribution to the ICFA Mini-Workshop on Beam-Beam Effects
in Hadron Colliders, CERN, Geneva, Switzerland, 18-22 Mar 201
Observations of beam-beam effects at the LHC
This paper introduces a list of observations related to the beam-beam
interaction that were collected over the first years of LHC proton physics
operation (2010-12). Beam-beam related effects not only have been extensively
observed and recorded, but have also shaped the operation of the LHC for
high-intensity proton running in a number of ways: the construction of the
filling scheme, the choice of luminosity levelling techniques, measures to
mitigate instabilities, and the choice of settings for improving performance
(e.g. to reduce losses), among others.Comment: Presented at the ICFA Mini-Workshop on Beam-Beam in Hadron Colliders,
CERN, Geneva, Switzerland, 18-22 March 201
Coherent beam-beam mode in the LHC
Observations of single bunch beam-beam coherent modes during dedicated
experiments in the LHC are presented. Their role in standard operation for
physics is discussed and, in particular, candidates of beam-beam coherent mode
driven unstable by the machine impedance are presented.Comment: 4 pages, contribution to the ICFA Mini-Workshop on Beam-Beam Effects
in Hadron Colliders, CERN, Geneva, Switzerland, 18-22 Mar 201
Long Range Beam-beam Effects in the LHC
We report on the experience with long-range beam--beam effects in the LHC, in
dedicated studies as well as the experience from operation. Where possible, we
compare the observations with the expectations.Comment: Presented at the ICFA Mini-Workshop on Beam-Beam in Hadron Colliders,
CERN, Geneva, Switzerland, 18-22 March 201
Commissioning of the Beam Interlock System for the TT40 and TT41 Transfer Lines of the SPS
The extraction area of LSS4 in the SPS and the TT40 and TT41 transfer lines have been equipped with a new interlock system to protect the machine elements against beam induced failure during operation with the high intensity CNGS beams. The system commissioning that was performed during the 2006 SPS run followed pre-defined commissioning procedures. An extensive WEB based documentation of the tests has been established to track the state of the interlock system, in particular of interlock references. This document presents a short summary of the commissioning as well as the complete documentation of the interlock tests
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