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2019-09-20
08:41
The ATLAS multi-user upgrade and potential applications / Mustapha, B (Argonne, PHY) ; Nolen, J A (Argonne, PHY) ; Savard, G (Argonne, PHY) ; Ostroumov, P N (Michigan State U., East Lansing (main))
With the recent integration of the CARIBU-EBIS charge breeder into the ATLAS accelerator system to provide for more pure and efficient charge breeding of radioactive beams, a multi-user upgrade of the ATLAS facility is being proposed to serve multiple users simultaneously. ATLAS was the first superconducting ion linac in the world and is the US DOE low-energy Nuclear Physics National User Facility. [...]
2017 - 11 p. - Published in : JINST 12 (2017) T12002

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2019-09-19
16:25
A VdM Sequence File Web Application / Hickman, Thomas Kendall ; Marqversen, Frederik Kofoed ; Calia, Andrea (CERN) ; Hostettler, Michi (CERN)
To perform Van der Meer scans at the LHC, the experimental collaborations have to supply a text file containing a command sequence specifying the beam positions required. [...]
CERN-ACC-NOTE-2019-0038. - 2019.

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2019-09-19
11:31
Studies of PACMAN effects in the HL-LHC / Ribes Metidieri, Ariadna (University of Barcelona (ES)) ; Buffat, Xavier (CERN)
This note summarises the status of the studies on PACMAN beam-beam effects in the HL-LHC project. [...]
CERN-ACC-NOTE-2019-0037. - 2019. - 34 p.
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2019-09-17
07:00
Channeling and volume reflection of high-energy charged particles in short bent crystals. Crystal assisted collimation of the accelerator beam halo / Scandale, W (CERN) ; Taratin, A M (Dubna, JINR)
The experimental studies of high-energy charged particle deflection due to planar and axial channeling as well as volume reflection and multi volume reflections in short bent crystals at the extracted beams of the CERN Super Proton Synchrotron (SPS) are considered. The experiments on the studies of crystal assisted collimation of the CERN SPS beam halo and the first similar experiment with the CERN Large Hadron Collider (LHC) beam of 6500 GeV/c protons are also considered..
2019 - 107 p. - Published in : Phys. Rep. 815 (2019) 1-107

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2019-09-17
07:00
Automatic spike detection in beam loss signals for LHC collimator alignment / Azzopardi, Gabriella (U. Malta ; CERN) ; Valentino, Gianluca (U. Malta) ; Muscat, Adrian (U. Malta) ; Salvachua, Belen (CERN)
A collimation system is installed in the Large Hadron Collider to protect its super-conducting magnets and sensitive equipment from potentially dangerous beam halo particles. The collimator settings are determined following an alignment procedure, whereby collimator jaws are moved towards the beam until a suitable spike pattern, consisting of a sharp rise followed by a slow decay, is observed in nearby beam loss monitors. [...]
2019 - 9 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 934 (2019) 10-18

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2019-09-17
07:00
Suppression of amplitude dependent closest tune approach and its behavior under forced oscillations / Persson, T (CERN) ; Tomás, R (CERN) ; Maclean, E H (CERN)
An amplitude dependent closest tune approach (ADeCTA) was first observed in the LHC in 2012. This potentially harmful effect can be generated by linear coupling in conjunction with octupoles. [...]
2019 - 6 p. - Published in : Phys. Rev. Accel. Beams 22 (2019) 051001 Fulltext from Publisher: PDF;

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2019-09-14
06:30
An upgraded luminosity leveling procedure for the ALICE Experiment / de Cataldo, Giacinto (INFN, Bari ; CERN) ; Valentino, Gianluca (CERN ; U. Malta) ; Franco, Antonio (INFN, Bari ; CERN) ; Alemany, Reyes (CERN) ; Follin, Fabio (CERN) ; Hostettler, Michi (CERN ; U. Bern (main)) ; Wenninger, Jorg (CERN)
The Large Hadron Collider (LHC) Interface project (LHC_IF) ensures that the A Large Ion Collider Experiment (ALICE) can operate congruently and safely with the LHC in different machine configurations and beam modes. Measurements in proton–proton (pp) collisions are vital for ALICE and serve as a reference to calibrate the Pb ion–Pb ion (Pb–Pb) measurements. [...]
2019 - 8 p. - Published in : IEEE Trans. Nucl. Sci. 66 (2019) 763-770

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2019-09-13
06:00
Thermal study of the ironless inductive position sensors installed on the LHC collimators / Grima, Adrian (U. Malta ; CERN) ; Di Castro, Mario (CERN) ; Masi, Alessandro (CERN) ; Sammut, Nicholas (Malta U. ; CERN)
The safe operation of the European Organization for Nuclear Research Large Hadron Collider relies on a complex system for equipment protection. An essential part of machine protection is the collimation system since it is used to protect the equipment from beam losses. [...]
2019 - 8 p. - Published in : IEEE Trans. Nucl. Sci. 66 (2019) 688-695

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2019-09-11
07:14
Validation of energy deposition simulations for proton and heavy ion losses in the CERN Large Hadron Collider / Lechner, A (CERN) ; Auchmann, B (CERN) ; Baer, T (CERN) ; Bahamonde Castro, C (CERN) ; Bruce, R (CERN) ; Cerutti, F (CERN) ; Esposito, L S (CERN) ; Ferrari, A (CERN) ; Jowett, J M (CERN) ; Mereghetti, A (CERN) et al.
Monte Carlo shower simulations are essential for understanding and predicting the consequences of beam losses in high-energy proton and ion colliders. Shower simulations are routinely used at CERN for estimating the beam-induced energy deposition, radiation damage, and radioactivity in the Large Hadron Collider (LHC). [...]
2019 - 24 p. - Published in : Phys. Rev. Accel. Beams 22 (2019) 071003 Fulltext from Publisher: PDF;

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2019-09-10
16:31
Proceedings of the 2019 MPP Workshop / Strachinescu, Sabina-Ioana (National School of Political and Administrative Studies Bucharest (RO)) ; Wollmann, Daniel (CERN) ; Zerlauth, Markus (CERN)
This report contains the proceedings of the MPP Workshop on LHC Machine Protection, held in Bogis-Bossey from 7th to 8th of May [...]
CERN-ACC-2019-0053. - 2019. - 24 p.
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