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Processes

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2024-12-20
12:11
Long-range beam-beam mitigation for round optics / Fartoukh, Stephane (CERN) ; Kostoglou, Sofia (CERN)
When colliding high intensity bunch trains at low beta*, a sufficiently large crossing angle needs to be imposed at the interaction point (IP) in order to separate the two beams before and after the collision, and mitigate the so-called long-range beam-beam (BBLR) effect, which otherwise can be very detrimental to the beam lifetime. [...]
CERN-ACC-NOTE-2023-0029. - 2023

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2022-04-21
12:13
How to Install and Operate Fixed Target Experiments in the North an East Experimental Areas at CERN / Gerbershagen, Alexander (CERN) ; Banerjee, Dipanwita (CERN) ; Bernhard, Johannes (CERN) ; Brugger, Markus (CERN) ; Charitonidis, Nikolaos (CERN) ; Gatignon, Lau (Lancaster University (GB)) ; Lazzaroni, Michael (CERN) ; Romagnoli, Giulia (CERN)
This note describes the required input, decision process and life cycle for the design, installation/adaptation, and operation of fixed target beam lines at the North and East Areas at CERN. [...]
CERN-ACC-NOTE-2022-0015. - 2022. - 8 p.
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2022-03-29
18:15
On the Evolution of the chromatic Functions around an IP computed by MAD-X / Carli, Christian (CERN) ; Skoufaris, Kyriacos (CERN)
The chromatic functions W defined by Montague are computed by MAD-X. [...]
CERN-ACC-NOTE-2022-0011. - 2022. - 7 p.
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2020-12-16
17:32
New Ideas for the MAD-X Aperture Calculation / Risselada, Thys
If a beam screen shape is made up of straight and circular segments the N1 values may be calculated exactly for each segment by a simple geometric construction..
CERN-ACC-NOTE-2020-0066. - 2020. - 11 p.
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2020-12-10
17:53
Resonance driving terms and tune spread with amplitude driven a beam-beam long range kick and a DC wire kick / Skoufaris, Kyriacos (University of Crete (GR)) ; Sterbini, Guido (CERN) ; Papaphilippou, Yannis (CERN)
This document presents in detail the derivation of the formulas that describe the resonance driving terms and the tune spread with amplitude generated by the beam-beam long range interactions and the DC wire compensators in cyclical machines. [...]
CERN-ACC-NOTE-2020-0064. - 2020. - 21 p.

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2020-11-26
12:42
Dynamic simulations and transient management of the HL-LHC cryogenic system during beam operation / Bradu, Benjamin (CERN)
This paper presents a set of dynamic simulations performed on the future High Luminosity Large Hadron Collider (HL-LHC) cryogenic system. [...]
CERN-ACC-NOTE-2020-0060. - 2020. - 36 p.
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2020-09-18
15:52
Design and Tuning of Secondary Beamlines in the CERN North and East Areas / Gatignon, Lau (CERN)
This document gives guidance for the design and tuning of secondary beam lines at CERN. [...]
CERN-ACC-Note-2020-0043. - 2020.
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2020-08-20
13:33
Numerical tools for Crab Cavity simulations / Alekou, Androula (University of Manchester (GB)) ; Appleby, Robert Barrie (University of Manchester (GB)) ; Bartosik, Hannes (CERN) ; Papaphilippou, Yannis (CERN)
This note gives the steps to be followed in order to include the crab cavities module in MAD-X for tracking simulations in SixTrack. [...]
CERN-ACC-NOTE-2020-0042. - 2020. - 16 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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2019-10-22
10:48
MD 3292: Measurements of Landau Damping by Means of BTF Measurements / Tambasco, Claudia (EPFL - Ecole Polytechnique Federale Lausanne (CH)) ; Amorim, David (Universite Grenoble-Alpes (FR)) ; Buffat, Xavier (CERN) ; Bruce, Roderik (CERN) ; Gasior, Marek (CERN) ; Levens, Tom (CERN) ; Mereghetti, Alessio (CERN) ; Metral, Elias (CERN) ; Mounet, Nicolas (CERN) ; Pieloni, Tatiana (EPFL - Ecole Polytechnique Federale Lausanne (CH)) et al.
The methodology applied in previous MDs has shown the possibility of using BTFs measurements to estimate the transverse Landau Damping of the beams for different machine configurations. [...]
CERN-ACC-NOTE-2019-0045. - 2019. - 10 p.
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