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Articles by Pascal Dominik
MD 7224: LHC collimation quench test with protons
Home > Articles & Preprints > CERN Notes > Accelerators & Technology Sector Notes > MD 7224: LHC collimation quench test with protons Report number CERN-ACC-NOTE-2023-0024 Title MD 7224: LHC collimation quench test with protons If you experience any problem watching the video, click the download button below Author(s) Hermes, Pascal Dominik (CERN) ; Abramov, Andrey (CERN) ; Bruce, Roderik (CERN) ; Calzolari, Daniele (Universita e INFN, Padova (IT)) ; D'Andrea, Marco (CERN) ; Giovannozzi,...
HL-LHC Run 4 proton operational scenario
Report number CERN-ACC-2022-0001 Title HL-LHC Run 4 proton operational scenario If you experience any problem watching the video, click the download button below Download Embed Author(s) Tomas Garcia, Rogelio (CERN) ; Arduini, Gianluigi (CERN) ; Baudrenghien, Philippe (CERN) ; Bruning, Oliver (CERN) ; Bruce, Roderik (CERN) ; Buffat, Xavier (CERN) ; Calaga, Rama (CERN) ; De Maria, Riccardo (CERN) ; Dilly, Joschua Werner (Humboldt University of Berlin (DE)) ; Efthymiopoulos, Ilias (CERN) ;...
CERN Document Server
For the high-luminosity upgrade of the Large Hadron Collider (HL-LHC), the development of the 11-T Nb3Sn dipole (MBH) is progressing. At present, one double-aperture and five single-aperture short-model magnets have been built and tested. Magnetic measurements have been performed both at ambient and cryogenic temperatures. In addition, a double-aperture short model and the first full-length collared-coil assemblies have been produced and measured at ambient temperature.
Detailed IR aperture measurements
MD 1673 was carried out on October 5 2016, in order to investigate in more detail the available aperture in the LHC high-luminosity insertions at 6.5 TeV and ??=40 cm. Previous aperture measurements in 2016 during commissioning had shown that the available aperture is at the edge of protection, and that the aperture bottleneck at ??=40 cm in certain cases is found in the separation plane instead of in the crossing plane.
CERN Document Server
This note summarizes the collimation quench test MD with 208Pb82+ beams at 6.37Z TeV in which a quench of a dipole magnet in the dispersion suppressor (DS) downstream of the betatron collimation region (IR7) was achieved. The aim of the test was to experimentally validate the quench limit in this region by means of inducing high losses at the LHC collimation system and quench the magnet with the collimation debris mainly lost at the IR7 DS.
CERN Document Server
The betatron collimators in IR7 constitute the backbone of the collimation system of the LHC. A fraction of the secondary halo protons or heavy-ion fragments, scattered out of the primary collimator, is not captured by the secondary collimators but hits cold magnets in the IR7 dispersion suppressor (DS) where the dispersion starts to increase. A possible approach to reduce these losses is based on the installation of additional collimators in the DS region.
CERN Document Server
This note summarizes MD 307, performed on August 27 2015, during which we measured with beam the global apertures at 6.5 TeV with IR1 and IR5 squeezed to β* =40 cm and a half crossing angle of 205 rad. The measurement technique involved opening collimators in steps, while inducing beam losses at each step, until the main loss location moved from the collimators to the global bottleneck in one of the triplets.
CERN Document Server
MD 310 was carried out on August 28 2015, in order to investigate the collimation performance using nominal optics with B*=40 cm, 2 o retraction collimator settings in IR7, and the very tight TCT settings which are necessary to protect the small normalized aperture. With these tight settings, we expect higher losses on the TCTs which should cause also higher beam-halo background at the experiments.
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