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Processes

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2018-10-23
17:16
New SC Algorithm for MAD-X / Schmidt, Frank (CERN) ; Alexahin, Yuri (Fermi National Accelerator Lab. (US))
MAD-X allows to simulate space-charge effects by approximating the macro-particle ensemble with a Gaussian distribution and using analytic formulas for calculation of the space-charge kick at locations which should be chosen in advance e.g [...]
CERN-ACC-2018-0036. - 2018. - 20 p.
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2018-09-25
17:58
Higher Order Dispersion and Momentum Compaction in MAD-X/PTC using NormalForm / Schmidt, Frank (CERN) ; Skowronski, Piotr Krzysztof (CERN) ; Valishev, Alexander (Fermi National Accelerator Lab. (US)) ; Lebedev, Valeri (Fermi National Accelerator Lab. (US))
Dispersion and the momentum compaction factor have been treated since ages in the literature of accelerator physics to first order. [...]
CERN-ACC-NOTE-2018-0062. - 2018. - 14 p.
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2018-08-13
15:09
Review of path-length calculations for rectangular bending magnets with arbitrary pole-face angles / Berrig, Olav Ejner (CERN)
This document shows how to calculate the path-length of rectangular bending magnets in a beam line. [...]
CERN-ACC-NOTE-2018-0059. - 2017. - 9 p.
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2018-08-01
11:15
An Updated Global Optics Correction Scheme / Dilly, Joschua Werner (Ministere des affaires etrangeres et europeennes (FR)) ; Malina, Lukas (CERN) ; Tomas Garcia, Rogelio (CERN)
Currently, the linear global correction scheme implemented in the OMC software uses responses to the available correctors, computed as difference quotients by MAD-X requiring appropriate step-size. [...]
CERN-ACC-NOTE-2018-0056. - 2018. - 15 p.
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2018-07-23
16:20
MD2148: Flat optics / Coello De Portugal - Martinez Vazquez, Jaime Maria (Universitat Politecnica Catalunya (ES)) ; Fartoukh, Stephane (CERN) ; Fol, Elena (Johann-Wolfgang-Goethe Univ. (DE)) ; Garcia-Tabares Valdivieso, Ana (Universidad Complutense (ES)) ; Maclean, Ewen Hamish (University of Malta (MT)) ; Malina, Lukas (CERN) ; Persson, Tobias Hakan Bjorn (CERN) ; Skowronski, Piotr Krzysztof (CERN) ; Solfaroli Camillocci, Matteo (CERN) ; Tomas Garcia, Rogelio (CERN) et al.
This note reports on the first attempt to measure and correct optics errors at β∗=60/30 cm and β∗=60/15 cm flat optics. [...]
CERN-ACC-NOTE-2018-0051. - 2018. - 14 p.
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2018-06-25
15:34
Modelling and implementation of the “6D” beam-beam interaction / Iadarola, Giovanni (CERN) ; De Maria, Riccardo (CERN) ; Papaphilippou, Yannis (CERN)
These slides illustrate the numerical modelling of a beam-beam interaction using the “Synchro Beam Mapping” approach. [...]
CERN-ACC-SLIDES-2018-0001. - 2018. - 104 p.
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2018-03-01
11:56
6D beam-beam interaction step-by-step / Iadarola, Giovanni (CERN) ; De Maria, Riccardo (CERN) ; Papaphilippou, Yannis (CERN)
This document describes in detail the numerical method used in different simulation codes for the simulation of beam-beam interactions using the “Synchro Beam Mapping” approach, in order to correctly model the coupling introduced by beam-beam between the longitudinal and the transverse plane. [...]
CERN-ACC-NOTE-2018-0023. - 2017. - 27 p.
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2016-09-30
10:27
Suppression of Amplitude dependent closest tune approach and first tests of the ADT as an AC-dipole (MD 1412) / Persson, Tobias Hakan Bjorn (CERN) ; Gasior, Marek (CERN) ; Maclean, Ewen Hamish (CERN) ; Olexa, Jakub (CERN) ; Tomas Garcia, Rogelio (CERN) ; Valuch, Daniel (CERN) ; Wierichs, David Alexander ; Carlier, Felix Simon (Technische Universiteit Delft (NL))
The amplitude detuning has been observed to decrease significantly as the horizontal and vertical tunes are approaching each other. [...]
CERN-ACC-NOTE-2016-0057. - 2016. - 6 p.
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2016-09-23
11:29
Coupling Measurements and Corrections for the Combined Ramp and Squeeze / Persson, Tobias Hakan Bjorn (CERN) ; Gorzawski, Arkadiusz (Ecole Polytechnique Federale de Lausanne (CH)) ; Langner, Andy Sven (CERN) ; Malina, Lukas (University of Oslo (NO)) ; Maclean, Ewen Hamish (CERN) ; Coello De Portugal - Martinez Vazquez, Jaime Maria (Universitat Politecnica Catalunya (ES)) ; Redaelli, Stefano (CERN) ; Salvachua Ferrando, Belen Maria (CERN) ; Schaumann, Michaela (CERN) ; Solfaroli Camillocci, Matteo (CERN) et al.
In operation of the LHC the ramp and the squeeze process have been independent beam processes up to now. [...]
CERN-ACC-NOTE-2016-0056. - 2016. - 6 p.

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2016-08-26
09:32
Demonstration of coupling correction below the per-mil limit in the LHC / Maclean, Ewen Hamish (CERN) ; Carlier, Felix Simon (Technische Universiteit Delft (NL)) ; Fartoukh, Stephane (CERN) ; Persson, Tobias Hakan Bjorn (CERN) ; Skowronski, Piotr Krzysztof (CERN) ; Tomas Garcia, Rogelio (CERN) ; Wierichs, David Alexander
Linear coupling between betatron motion in the transverse planes is one of the key optics parameters for any accelerator. [...]
CERN-ACC-NOTE-2016-0053. - 2016. - 7 p.

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