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Processes

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2025-01-14
11:18
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-2023-0005. - 2023 - 22.

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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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