CERN Accelerating science

All CERN Accelerators documents

Последно добавени:
2020-09-29
09:14
Optimisation of the CLIC positron source at the 1.5 TeV and 3 TeV stages / Zhao, Yongke (CERN, Shandong University (CN)) ; Latina, Andrea (CERN) ; Doebert, Steffen (CERN) ; Schulte, Daniel (CERN) ; Ma, Lianliang (Shandong University (CN))
Positron source is very important for many accelerator experiments. [...]
CERN-ACC-2020-0026 ; CLIC-Note-1165.
- 2020. - 29 p.
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2020-09-28
21:56
Revisiting QCD corrections to the forward-backward charge asymmetry of heavy quarks in $\mathrm{e^{+}e^{-}}$ collisions: really a problem? / Alcaraz Maestre, Juan (Centro de Investigaciones Energéti cas Medioambientales y Tecnológicas (ES))
We review in some detail the QCD corrections to the measurement of the forward-backward charge asymmetry of heavy quarks in the $\mathrm{e^{+}e^{-}\to Q\overline{Q}(g)}$ process at the Z pole. We show that the size of these corrections can be reduced by an order of magnitude by using simple cuts on jet acollinearity. [...]
Geneva : CERN, 2020 Access to fulltext document: PDF;

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2020-09-26
06:00
A Highschooler’s Guide to GeV-Range Electromagnetism / Chatterji, Satchit (Unlisted, IN) ; Desai, Aayush (Unlisted, IN) ; Dwarkesh, Aditya (Unlisted, IN) ; Ganesh, Anushree (Unlisted, IN) ; Kunder, Ameya (Unlisted, IN) ; Malhotra, Pulkit (Unlisted, IN) ; Sahoo, Roshni (Unlisted, IN) ; Shah, Jinal (Unlisted, IN) ; Velmurugan, Kiranbhaskar (Unlisted, IN) ; Joos, Markus (CERN) et al.
The following article has been written primarily by the high school students who make up the team “Cryptic Ontics”, one of the two winning teams in the 2018 edition of CERN’s Beamline for Schools (BL4S) competition, and is based on the set of experiments the students endeavoured to conduct over the course of a two-week period at CERN. [...]
2020.
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2020-09-25
11:23
Can an extra HOM-like impedance explain the high octupole threshold at Q′ ∼ 0 in the LHC? / Antipov, Sergey ; Biancacci, Nicolo (CERN) ; Metral, Elias (CERN)
The 2015 LHC octupole threshold measurement campaign revealed a higher Landau octupole current between the measured octupole threshold and impedance model predictions for chromaticities below few units. [...]
CERN-ACC-NOTE-2020-0051.
- 2020. - 13 p.

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2020-09-25
11:02
Numerical simulations studies on single-bunch instabilities driven by electron clouds at the LHC / Sabato, Luca (CERN) ; Iadarola, Giovanni (CERN) ; Mether, Lotta (CERN)
Instabilities driven by electron clouds in the LHC are studied by means of numerical simulations performed with the PyECLOUD-PYHEADTAIL suite. [...]
CERN-ACC-NOTE-2020-0050.
- 2020. - 29 p.
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2020-09-25
10:47
MD 3603: Dynamic Aperture with uncorrected dipole b3 / Hofer, Michael (Vienna University of Technology (AT)) ; Carlier, Felix Simon (Technische Universiteit Delft (NL)) ; Dilly, Joschua Werner (Humboldt University of Berlin (DE)) ; Fol, Elena (Goethe University Frankfurt (DE)) ; Garcia-Tabares Valdivieso, Ana (Universidad Complutense (ES)) ; Maclean, Ewen Hamish (CERN) ; Malina, Lukas (CERN) ; Persson, Tobias Hakan Bjorn (CERN) ; Coello De Portugal - Martinez Vazquez, Jaime Maria ; Solfaroli Camillocci, Matteo (CERN) et al.
The hadron collider options currently investigated as part of the FCC study rely on the use of dipoles with a field strength of 16 T or above in order to achieve the targeted collision energy. [...]
CERN-ACC-NOTE-2020-0049.
- 2020. - 22 p.
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2020-09-25
10:42
MD3287: Luminosity scans with waist shifts / Coello De Portugal - Martinez Vazquez, Jaime Maria ; Malina, Lukas (CERN) ; Tomas Garcia, Rogelio (CERN)
This note reports on the first measurements of the beam waist displacements in the LHC using luminosity scans. [...]
CERN-ACC-NOTE-2020-0048.
- 2020. - 11 p.

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2020-09-25
10:28
LHC injection losses for tighter collimator settings in view of HE-LHC / Bartmann, Wolfgang (CERN) ; Bracco, Chiara (CERN) ; Bruce, Roderik (CERN) ; Crouch, Matthew Paul ; Goddard, Brennan (CERN) ; Molson, James (CERN) ; Redaelli, Stefano (CERN)
In view of the smaller physical apertures of Nb3Sn magnets for the HE-LHC study, a machine study was performed in the LHC to tighten correspondingly the ring and injection protection collimators and measure the change in loss behaviour. [...]
CERN-ACC-NOTE-2020-0047.
- 2020. - 10 p.

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2020-09-25
04:09
Systematic error studies for the charged particle EDM measurement proposal / Tahar, M. Haj (CERN) ; Carli, C. (CERN)
Proposals aimed at measuring the Electric Dipole Moment (EDM) for charged particles require a good understanding of the systematic errors that can contribute to a vertical spin buildup mimicking the EDM signal to be detected. [...]
arXiv:2008.12058.
- 20 p.
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2020-09-24
09:47
Study of beam-gas interaction at the LHC for the Physics Beyond Collider Fixed-Target study / Boscolo Meneguolo, Caterina (Universita e INFN, Padova (IT))
CERN-THESIS-2020-120.- 80 p. Fulltext: PDF; External link: Approve this document (restricted)

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