All CERN Accelerators documents

2020-02-22
07:03
 Analysis of 440 GeV proton beam–matter interaction experiments at the High Radiation Materials test facility at CERN / Burkart, F (Frankfurt U. ; CERN) ; Schmidt, R (CERN) ; Raginel, V (CERN) ; Wollmann, D (CERN) ; Tahir, N A (Darmstadt, GSI) ; Shutov, A (IPCP, Chernogolovka) ; Piriz, A R (Castilla-La Mancha U.) In a previous paper [Schmidt et al., Phys. Plasmas 21, 080701 (2014)], we presented the first results on beam–matter interaction experiments that were carried out at the High Radiation Materials test facility at CERN. [...] AIP, 2015 - 9 p. - Published in : J. Appl. Phys. 118 (2015) 055902

2020-02-22
07:03
 Transformer ratio saturation in a beam-driven wakefield accelerator / Farmer, J P (Heinrich Heine U., Dusseldorf) ; Martorelli, R (Heinrich Heine U., Dusseldorf) ; Pukhov, A (Heinrich Heine U., Dusseldorf) We show that for beam-driven wakefield acceleration, the linearly ramped, equally spaced train of bunches typically considered to optimise the transformer ratio only works for flat-top bunches. Through theory and simulation, we explain that this behaviour is due to the unique properties of the plasma response to a flat-top density profile. [...] AIP, 2015 - 6 p. - Published in : Phys. Plasmas 22 (2015) 123113

2020-02-22
07:03
 Calibration of Fourier domain short coherence interferometer for absolute distance measurements / Montonen, R (Helsinki Inst. of Phys. ; Helsinki U.) ; Kassamakov, I (Helsinki Inst. of Phys. ; Helsinki U.) ; Hæggström, E (Helsinki U.) ; Österberg, K (Helsinki Inst. of Phys. ; Helsinki U.) We calibrated and determined the measurement uncertainty of a custom-made Fourier domain short coherence interferometer operated in laboratory conditions. We compared the optical thickness of two thickness standards and three coverslips determined with our interferometer to the geometric thickness determined by SEM. [...] OSA, 2015 - 5 p. - Published in : Appl. Opt. 54 (2015) 4635

2020-02-21
09:30
 A Proposal for an Automatic Longitudinal Tomography Demonstration Project in the Proton Synchrotron Booster / Albright, Simon (CERN) Longitudinal phase space tomography is a vital tool for beam diagnostics in most of the CERN synchrotrons, it is used to reconstruct the longitudinal phase space, and to measure the longitudinal emittance and energy spread. [...] CERN-ACC-NOTE-2020-0014. - 2020. - 12 p. Full text

2020-02-20
18:15
 Measurement of $D^0-\overline{D^0}$ mixing parameters and search for $CP$ violation in $D^0 \rightarrow K^+ \pi^-$ decays with LHCb Run 2 data / Ribatti, Roberto (Universita & INFN Pisa (IT)) $D^0-\overline{D^0}$ mixing parameters are measured in the decay-time-dependent ratio of $D^0 \rightarrow K^+ \pi^-$ to $D^0 \rightarrow K^- \pi^+$ rates. The analysis uses a data sample of proton-proton collisions corresponding to an integrated luminosity of $5.9\,\text{fb}^{-1}$ collected by LHCb experiment from 2015 to 2018 at the center-of-mass energy of $13$ TeV. [...] CERN-THESIS-2019-298.- Fulltext: PDF; External link: Approve this document (restricted)

2020-02-19
16:42
 Finite Element Analysis of Magneto-Thermal Transient Effects in Superconducting Accelerator Magnets / Wilczek, Michal (Lodz Technical University (PL)) In this thesis, an electro-thermal multidimensional model is constructed in ANSYS APDL to simulate self-protectability scenarios of superconducting magnets. The analysis takes the longitudinal and the turn-to-turn quench propagation into account. [...] CERN-THESIS-2020-006.- 141 p. Fulltext: PDF; External link: Approve this document (restricted)

2020-02-18
18:42
 Anomaly detection for the injection kickermagnets of the CERN Large HadronCollider / Dewitte, Thiebout Thomas Reliability, availability and maintainability are parameters that determine if a large-scale accelerator system can be operated in a sustainable and cost effective manner. Beam transfer equipment such as kicker systems are critical components with potential significant impact on the global performance of the entire machine complex [...] CERN-THESIS-2019-294.- 85 p. Fulltext: PDF; External link: Approve this document (restricted)

2020-02-18
12:10
 MD4944: Local linear coupling measurement at the IPs / Persson, Tobias Hakan Bjorn (CERN) ; Carlier, Felix Simon (Technische Universiteit Delft (NL)) ; Hofer, Michael (Vienna University of Technology (AT)) ; Maclean, Ewen Hamish (University of Malta (MT)) ; Tomas Garcia, Rogelio (CERN) ; Garcia-Tabares Valdivieso, Ana (Universidad Complutense (ES)) It was observed that a large local linear coupling around IP2 reduced the luminosity during the 2018 ion run. [...] CERN-ACC-NOTE-2020-0013. - 2020. - 9 p.

2020-02-18
12:05
 Assessment of numerical methods for particle tracking in field maps / Agazzi, Costanza (Politecnico di Milano (IT)) Particle tracking in accelerators elements requires accurate and eﬃcient numerical methods. The aim of this thesis is to study and test methods which guarantee the conservation of particle motion properties when crossing non-linear elements. [...] CERN-THESIS-2019-292.- 106 p. Fulltext: PDF; External link: Approve this document (restricted)

2020-02-18
09:18
 Q-Measurement in the SPS / Mills, W P C LabII-CO-Int-BM-PM-73-3 ; CERN-LabII-CO-Int-BM-PM-73-3. - 1973. - 15 p. Full text