| Paper | Title | Page |
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| MOPTY052 | Experimental and Simulation Studies of Hydrodynamic Tunneling of Ultra-Relativistic Protons | 1048 |
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The expected damage due to the release of the full LHC beam energy at a single aperture bottleneck has been studied. These studies have shown that the range of the 7 TeV LHC proton beam is significantly extended compared to that of a single proton due to hydrodynamic tunneling effect. For instance, it was evaluated that the protons and their showers will penetrate up to a length of 25 m in solid carbon compared to a static range of around 3 m. To check the validity of these simulations, beam- target heating experiments using the 440 GeV proton beam generated by the SPS were performed at the HiRadMat test facility at CERN *. Solid copper targets were facially irradiated by the beam and measurements confirmed hydrodynamic tunneling of the protons and their showers. Simulations have been done by running the energy deposition code FLUKA and the 2D hydrodynamic code, BIG2, iteratively. Very good agreement has been found between the simulations and the experimental results ** providing confidence in the validity of the studies for the LHC. This paper presents the simulation studies, the results of a benchmarking experiment, and the detailed target investigations.
* N.A. Tahir et al., Phys. Rev. Special Topics Accel. Beams 15 (2012) 051003. ** R. Schmidt et al., Phys. Plasmas 21 (2014) 080701. |
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| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPTY052 | |
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| MOPTY059 | First Operational Experience of DSL Based Analysis Modules for LHC Hardware Commissioning | 1073 |
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| The Large Hadron Collider powering systems have been tested and commissioned before to start the second run of physics production. This commissioning used for the first time analysis modules defined directly by system experts in an english-like domain specific language. In these modules, the experts defined assertions that the data generated by the powering tests must verify in order for the test to pass. These modules concerned 4 tests executed for more than 1000 systems. They allowed experts to identify issues that were hidden behind the repetitive manual analysis performed during the previous campaigns. This paper describes this first operational experience of the analysis modules, as well as the replay of all the previous campaign with them. It will also present a critical point of view on these modules to identify their drawbacks and the next step to improve this system. | ||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPTY059 | |
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| TUPTY053 | Roadmap towards High Accelerator Availability for the CERN HL-LHC Era | 2143 |
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| High Luminosity-LHC is the future upgrade of the LHC that aims at delivering an integrated luminosity of 3000 fb-1 over about 10 years of operation, starting from 2025. Significant modifications [1] will be implemented to accelerator systems, including new superconducting magnets, crab cavities, superconducting links, new collimators and absorbers based on advanced materials and design and additional cryo-plants. Due to the limit imposed by the number of simultaneous events at the experiments (pile-up) on peak luminosity, the latter will be levelled to 5*1034 cm-2s−1. The target integrated luminosity can only be achieved with a significant increase of the total available time for beam collisions compared to the 2012 LHC run, despite a beam current that is planned to double the nominal 0.58 A. Therefore one of the key figures of merit to take into account for system upgrades and new designs is their impact on the accelerator availability. In this paper the main factors affecting LHC availability will be discussed and predictions on the impact of future system upgrades on integrated luminosity presented. Requirements in terms of the maximum allowed number of dumps for the main contributing systems to LHC unavailability will be derived. | ||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-TUPTY053 | |
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