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CERN Accelerating science

LHC

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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)

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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)

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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.

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2020-02-14
07:40
A Comparative Study of Radiation-Tolerant Fiber Optic Sensors for Relative Humidity Monitoring in High-Radiation Environments at CERN / Berruti, G (CERN ; Sannio U.) ; Consales, M (Sannio U.) ; Borriello, A (CNR, IMCB) ; Giordano, M (CNR, IMCB) ; Buontempo, S (INFN, Naples) ; Makovec, A (Debrecen U.) ; Breglio, G (U. Naples (main)) ; Petagna, P (CERN) ; Cusano, A (Sannio U.)
In this paper, we report a comparative study of fiber optic sensors for applications of relative humidity (RH) monitoring in high-radiation environments. [...]
2014. - 15 p.

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2020-01-23
17:31
MD 3584: Long-Range Beam-Beam 2018 / Karastathis, Nikos ; Fartoukh, Stephane (CERN) ; Kostoglou, Sofia (National Technical Univ. of Athens (GR)) ; Papaphilippou, Yannis (CERN) ; Pojer, Mirko (CERN) ; Poyet, Axel (Universite Grenoble-Alpes (FR)) ; Solfaroli Camillocci, Matteo (CERN) ; Sterbini, Guido (CERN)
A recurrent issue of the LHC operation, observed both during Run1 and Run2 is the asymmetric behaviour of the two beams in terms of particle losses. [...]
CERN-ACC-NOTE-2020-0011.
- 2020. - 29 p.
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2020-01-23
14:41
Study of the Transverse Mode Coupling Instability in the CERN Large Hadron Collider / Amorim, David
The High-Luminosity upgrade of the CERN LHC will increase the performance of the accelerator and the potential physics discoveries [...]
CERN-THESIS-2019-272 -

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2020-01-23
14:37
LHC MD 2401: Beam-Based Measurement of the MKD Rise Time / Wiesner, Christoph (CERN) ; Bartmann, Wolfgang (CERN) ; Bracco, Chiara (CERN) ; Carlier, Etienne (CERN) ; Fraser, Matthew Alexander (CERN) ; Hessler, Christoph ; Magnin, Nicolas (CERN) ; Renner, Elisabeth (Vienna University of Technology (AT))
This note summarises the beam-based measurements of the MKD rise time for both LHC beams performed during MD4 on December 2nd, 2017 and discusses the results [...]
CERN-ACC-NOTE-2020-0010.
- 2018. - 6 p.
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2020-01-17
14:37
LHC MD4044: Asynchronous Beam Dump Test with Bunched Beam at Flat Top / Wiesner, Christoph (CERN) ; Apollonio, Andrea (CERN) ; Bartmann, Wolfgang (CERN) ; Bracco, Chiara (CERN) ; Carlier, Etienne (CERN) ; Frankl, Matthias Immanuel ; Fraser, Matthew Alexander (CERN) ; Hessler, Christoph ; Lechner, Anton (CERN) ; Magnin, Nicolas (CERN) et al.
This note summarises the LHC Machine Development (MD) 4044, which studied the beam-loss and quench behaviour during asynchronous beam dumps at injection and at top energy using bunched beam in the abort gap. [...]
CERN-ACC-NOTE-2020-0009.
- 2020. - 15 p.
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2020-01-17
14:34
LHC MD2930: Asynchronous Beam Dump Test with Bunched Beam / Wiesner, Christoph (CERN) ; Bartmann, Wolfgang (CERN) ; Bracco, Chiara (CERN) ; Carlier, Etienne (CERN) ; Fraser, Matthew Alexander (CERN) ; Hessler, Christoph ; Lechner, Anton (CERN) ; Magnin, Nicolas (CERN) ; Renner, Elisabeth (Vienna University of Technology (AT)) ; Wollmann, Daniel (CERN) et al.
This note summarises the results of LHC Machine Development (MD) 2930, which studied the beam-loss behaviour during asynchronous beam dumps at 450 GeV and at 6.5 TeV using bunched beam in the abort gap. [...]
CERN-ACC-NOTE-2020-0008.
- 2020. - 10 p.
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2020-01-16
17:27
An alternative method to measure amplitude dependence of the closest tune approach / Maclean, Ewen Hamish (University of Malta (MT)) ; Carlier, Felix Simon (Technische Universiteit Delft (NL)) ; Persson, Tobias Hakan Bjorn (CERN) ; Tomas Garcia, Rogelio (CERN) ; Fuchsberger, Kajetan
In the linear regime, a minimum closest approach of the fractional horizontal and vertical tunes exists, due to linear coupling between the transverse planes. [...]
CERN-ACC-NOTE-2020-0007.
- 2020.
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