| Paper | Title | Page |
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| MOPMR027 | Employing Beam-Gas Interaction Vertices for Transverse Profile Measurements | 296 |
| SUPSS073 | use link to see paper's listing under its alternate paper code | |
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Interactions of high-energy beam particles with residual gas offer a unique opportunity to measure the beam profile in a non-intrusive fashion. Such a method was successfully pioneered* at the LHCb experiment using a silicon microstrip vertex detector. During the recent Large Hadron Collider shutdown at CERN, a demonstrator Beam-Gas Vertexing system based on eight scintillating-fibre modules was designed**, constructed and installed on Ring 2 to be operated as a pure beam diagnostics device. The detector signals are read out and collected with LHCb-type front-end electronics and a DAQ system consisting of a CPU farm. Tracks and vertices will be reconstructed to obtain a beam profile in real time. Here, first commissioning results are reported. The advantages and potential for future applications of this technique are discussed.
* LHCb collaboration, Journal of Instrumentation, 9, P12005 ** P. Hopchev in Proc. of IPAC 2014, June 15-20, 2014, Dresden Germany |
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| DOI • | reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPMR027 | |
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| MOPMR031 | Investigation of Injection Losses at the Large Hadron Collider with Diamond Based Particle Detectors | 310 |
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| During the operation of the Large Hadron Collider (LHC) in 2015, increased injection losses were observed. To minimize stress on accelerator components in the injection regions of the LHC and to guarantee an efficient operation these losses needed to be understood and possible mitigation techniques should be studied. Measurements with diamond particle detectors revealed the loss structure with ns-resolution for the first time. Based on these measurements, recaptured beam from the Super Proton Synchrotron (SPS) surrounding the nominal bunch train was identified as the major contributor to the injection loss signals. Methods to reduce the recaptured beam in the SPS were successfully tested and verified with the diamond particle detectors. In this paper the detection and classification of LHC injection losses are described. The methods to reduce these losses and verification measurements are presented and discussed. | ||
| DOI • | reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPMR031 | |
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| THPOR048 | Beam Losses at CERNs PS and SPS Measured with Diamond Particle Detectors | 3898 |
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| Diamond particle detectors have been used in the LHC to measure fast particle losses with a nanosecond time resolution. In addition, these detectors were installed in the PS and the SPS. The detectors are mounted close to the extraction septum of the PS (transfer line to SPS) and the SPS (transfer lines TI2 and TI8 to LHC). Mainly, they monitor the losses occurring during the extraction process but the detectors are also able to measure turn-by-turn losses in the accelerators. In addition, detailed studies concerning losses due to ghost bunches were performed. This paper will describe the installed diamond detector setup, discuss the measurement results and possible loss mitigations. | ||
| DOI • | reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOR048 | |
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| THPOY046 | Data Analysis and System Survey Framework for the LHC Beam Loss Monitoring System | 4207 |
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| A data analysis framework has been developed to perform systematic queries and automatic analysis of the large amount of data produced by the LHC beam loss monitoring system. The framework is used to provide continuous system supervision and can give advance warning of any potential system failures. It is also used to facilitate LHC beam loss analysis for determining the critical beam-abort threshold values. This paper describes the functionality of the framework and the results achieved from the analysis. | ||
| DOI • | reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOY046 | |
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