CERN Accelerating science

LHC

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2014-09-17
12:26
SPS Beam Steering for LHC Extraction / Gianfelice Wendt, E (Fermilab) ; Bartosik, H (-) ; Cornelis, K (-) ; Norderhaug Drosdal, L (-) ; Goddard, B (-) ; Kain, V (-) ; Meddahi, M (-) ; Papaphilippou, Y (-) ; Wenninger, J (-)
Beside producing beams for fixed target operation, the CERN Super Proton Synchrotron (SPS) accelerates beams for injection into the Large Hadron Collider (LHC). [...]
CERN-ACC-2014-0204.
- 2014. - 3 p.

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2014-09-16
09:38
Impact of Nb3Sn Dipoles on the LHC Lattice and Beam Optics / Holzer, B
In view of the LHC operation at full energy (7 TeV) as well as in preparation for the HL-LHC luminosity upgrade an improved collimation system is planned, which foresees additional collimators in the dispersion suppressor region of the ring. [...]
CERN-ACC-NOTE-2014-0063.
- 2014. - 32 p.

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2014-09-10
09:43
Injection and Extraction Systems for a High-Power Proton Synchrotron at CERN / Bartmann, W ; Fedosseev, V ; Goddard, B ; Kramer, T
A new High-Power Proton Synchrotron (HP-PS) is being studied at CERN for the second phase of the Long Baseline Neutrino facility (LAGUNA-LBNO) where a 2 MW beam power shall impinge onto a target. [...]
CERN-ACC-2014-0200.
- 2014. - 3 p.

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2014-09-05
10:30
Observation of the Higgs particle in γγ events and search for the Higgs particle in Zγ events at ATLAS / Liu, Kun
This thesis focuses on the searches for the Higgs boson in events with photons in the √ final states, using the full proton-proton collision data collected by ATLAS at s = 7 and 8 TeV in 2011 and 2012 [...]
172 p.

TeL server - Fulltext
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2014-08-22
08:24
Study on off-momentum tail scraping in the LHC / Mirarchi, D ; Redaelli, S ; Bruce, R
A study on o-momentum tail population in the LHC was performed through collimator scraping at high dispersion region. [...]
CERN-ACC-NOTE-2014-0061.
- 2014. - 13 p.
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2014-08-12
15:21
FEM Analysis of Beam-Coupling Impedance and RF Contacts Criticality of the LHC UA9 Piezo Goniometer / Danisi, A (CERN) ; Zannini, C (CERN) ; Passarelli, A (CERN) ; Masi, A (CERN) ; Losito, R (CERN) ; Salvant, B (CERN)
The UA9 piezo-goniometer has been designed to guarantee micro-radians-accuracy angular positioning of a silicon crystal for a crystal collimation experiment in the LHC, and to minimize the impact on the LHC beam coupling impedance. This paper presents a Finite Element Method (FEM) study of the device, in both parking and operational positions, to evaluate its impact on the LHC impedance budget. [...]
CERN-ACC-2014-0192.- Geneva : CERN, 2014 - 4 p. Fulltext: PDF;
In : 5th International Particle Accelerator Conference, Dresden, Germany, 15 - 20 Jun 2014, pp.1692-1694

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2014-08-12
15:03
FLUKA Simulation of Particle Fluences to ALICE due to LHC Injection Kicker Failures / Shetty, N V (CERN) ; Bracco, C (CERN) ; Di Mauro, A (CERN) ; Lechner, A (CERN) ; Leogrande, E (CERN) ; Uythoven, J (CERN)
The counter-rotating beams of the LHC are injected in insertion regions which also accommodate the ALICE and LHCb experiments. An assembly of beam absorbers ensures the protection of machine elements in case of injection kicker failures, which can affect either the injected or the stored beam. [...]
CERN-ACC-2014-0190.- Geneva : CERN, 2014 - 4 p. Fulltext: PDF;
In : 5th International Particle Accelerator Conference, Dresden, Germany, 15 - 20 Jun 2014, pp.109-111

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2014-08-12
14:44
Energy Deposition and Quench Level Calculations for Millisecond and Steady-State Quench Tests of LHC Arc Quadrupoles at 4 TeV / Shetty, N V (CERN) ; Auchmann, B (CERN) ; Chetvertkova, V (CERN) ; Lechner, A (CERN) ; Priebe, A (CERN) ; Sapinski, M (CERN) ; Verweij, A (CERN) ; Wollmann, D (CERN)
In 2013, beam-induced quench tests with 4 TeV protons were performed to probe the quench level of LHC arc quadrupole magnets at timescales corresponding to millisecond beam losses and steady-state losses. As the energy deposition in magnet coils cannot be measured directly, this study presents corresponding FLUKA simulations as well as estimates of quench levels derived with the QP3 code. [...]
CERN-ACC-2014-0189.- Geneva : CERN, 2014 - 5 p. Fulltext: PDF;
In : 5th International Particle Accelerator Conference, Dresden, Germany, 15 - 20 Jun 2014, pp.105-108

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2014-08-07
16:40
Mechanical Engineering and Design of Novel Collimators for HL-LHC / Carra, F (CERN) ; Bertarelli, A (CERN) ; Dallocchio, A (CERN) ; Gentini, L (CERN) ; Gradassi, P (CERN) ; Maitrejean, G (CERN) ; Manousos, A (CERN) ; Mariani, N (CERN) ; Mounet, N (CERN) ; Quaranta, E (CERN) et al.
In view of High Luminosity LHC (HL-LHC) upgrades, collimator materials may become a limit to the machine performance: the high RF impedance of Carbon-Carbon composites used for primary and secondary collimators can lead to beam instabilities, while the Tungsten alloy adopted in tertiary collimators exhibits low robustness in case of beam-induced accidents. An R&D; program has been pursued to develop new materials overcoming such limitations. [...]
CERN-ACC-2014-0184.- Geneva : CERN, 2014 - 5 p. Fulltext: PDF;
In : 5th International Particle Accelerator Conference, Dresden, Germany, 15 - 20 Jun 2014, pp.369-372

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2014-08-06
15:02
Construction and bench testing of a prototype rotatable collimator for the LHC / Markiewicz, T (SLAC) ; Bong, E (SLAC) ; Keller, L (SLAC) ; Aberle, O (CERN) ; Bertarelli, A (CERN) ; Gradassi, P (CERN) ; Marsili, A (CERN) ; Redaelli, S (CERN) ; Rossi, A (CERN) ; Salvachua, B (CERN) et al.
A second generation prototype rotatable collimator has been fabricated at SLAC and delivered to CERN for further vacuum, metrology, function and impedance tests. [...]
CERN-ACC-2014-0181.
- 2014. - 4 p.
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