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Accelerators & Technology Sector Notes

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2018-05-22
11:55
LHCb Upgrades and operation at 1034 cm-2 s-1 luminosity –A first study / Efthymiopoulos, Ilias (CERN) ; Arduini, Gianluigi (CERN) ; Baglin, Vincent (CERN) ; Burkhardt, Helmut (CERN) ; Cerutti, Francesco (CERN) ; Claudet, Serge (CERN) ; Di Girolamo, Beniamino (CERN) ; De Maria, Riccardo (CERN) ; Esposito, Luigi Salvatore (CERN) ; Karastathis, Nikos (CERN) et al.
Presently, the LHCb experiment at IP8 operates at reduced luminosity (~4.0 1032 cm-2 s-1) compared to ATLAS and CMS experiments. [...]
CERN-ACC-NOTE-2018-0038. - 2018.

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2018-04-23
09:05
Proposal for a Simplified Management of Accelerator Settings in the Injector Complex Based on Automatic Setting Propagation / Damerau, Heiko (CERN)
With the increasing number of beams with different characteristics the number of controls settings to pilot the accelerator hardware has grown proportionally. [...]
CERN-ACC-NOTE-2018-0037. - 2018. - 6 p.

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2018-04-20
16:04
Status of the studies on collective effects involving beam-beam interactions at the HL-LHC / Buffat, Xavier (CERN) ; Barraud, Laurent (Universite Pierre et Marie Curie et Universite Denis Diderot (FR)) ; Metral, Elias (CERN) ; Ribes Metidieri, Ariadna (University of Barcelona (ES)) ; Barranco Garcia, Javier (EPFL - Ecole Polytechnique Federale Lausanne (CH)) ; Goncalves Jorge, Patrik ; Pieloni, Tatiana (EPFL - Ecole Polytechnique Federale Lausanne (CH)) ; Tambasco, Claudia (EPFL - Ecole Polytechnique Federale Lausanne (CH))
This note summarised the status of the studies on the coherent beam-beam effects in the HL-LHC project. [...]
CERN-ACC-NOTE-2018-0036. - 2018. - 24 p.
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2018-04-20
15:58
Report from LHC MDs 1391 and 1483: Tests of new methods for study of nonlinear errors in the LHC experimental insertions / Maclean, Ewen Hamish (University of Malta (MT)) ; Carlier, Felix Simon (Technische Universiteit Delft (NL)) ; Fuchsberger, Kajetan (CERN) ; Giovannozzi, Massimo (CERN) ; Persson, Tobias Hakan Bjorn (CERN) ; Tomas Garcia, Rogelio (CERN)
Nonlinear errors in experimental insertions can pose a significant challenge to the operability of low-β∗ colliders. [...]
CERN-ACC-NOTE-2018-0035. - 2017. - 14 p.

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2018-04-20
15:54
Report from LHC MD 1391: First tests of the variation of amplitude detuning with crossing angle as an observable for high-order errors in low-β∗ colliders / Maclean, Ewen Hamish (University of Malta (MT)) ; Carlier, Felix Simon (Technische Universiteit Delft (NL)) ; Fuchsberger, Kajetan (CERN) ; Giovannozzi, Massimo (CERN) ; Persson, Tobias Hakan Bjorn (CERN) ; Tomas Garcia, Rogelio (CERN)
Nonlinear errors in experimental insertions can pose a significant challenge to the operability of low-β∗ colliders. [...]
CERN-ACC-NOTE-2018-0034. - 2017. - 10 p.

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2018-04-13
10:26
MD2065: Emittance exchange with linear coupling / Carver, Lee Robert (University of Liverpool (GB)) ; Buffat, Xavier (CERN) ; Persson, Tobias Hakan Bjorn (CERN) ; Amorim, David (Universite Grenoble-Alpes (FR)) ; Levens, Tom (CERN) ; Pesah, Arthur Chalom
In order to better understand the luminosity imbalance between ATLAS and CMS that was observed in 2016, it was proposed to perform a test whereby the horizontal and vertical emittances are exchanged by crossing the tunes in the presence of linear coupling. [...]
CERN-ACC-NOTE-2018-0033. - 2018. - 4 p.
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2018-04-09
15:09
New beam-based and direct magnetic waveform measurements of the BTx.KFA10(20) vertical recombination kickers and induced emittance blow-up simulations at 1.4 and 2 GeV / Forte, Vincenzo (CERN) ; Fraser, Matthew Alexander (CERN) ; Borburgh, Jan (CERN) ; Sermeus, Luc (CERN)
In the framework of the LHC Injectors Upgrade (LIU) project [1], this document summarises a new reconstruction methodology for the measurement of the magnetic waveforms of the vertical re-combination kickers BT1.KFA10, BT4.KFA10 and BT2.KFA20, from data collected during several Machine Development (MD) sessions. [...]
CERN-ACC-NOTE-2018-0032. - 2018. - 30 p.
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2018-04-09
15:05
Magnetic Waveform Measurements of the PS Injection Kicker KFA45 and Future Emittance Growth Estimates / Forte, Vincenzo (CERN) ; Fraser, Matthew Alexander (CERN) ; Ferrero Colomo, Alvaro (CERN)
In the framework of the LHC Injectors Upgrade (LIU) project [1], this document summarises the beam-based measurement of the magnetic waveform of the PS injection kicker KFA45 [2], from data collected during several Machine Development (MD) sessions in 2016 and 2017. [...]
CERN-ACC-NOTE-2018-0031. - 2018. - 47 p.
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2018-04-03
16:30
MD2725: 16L2 aperture measurement / Mirarchi, Daniele ; Redaelli, Stefano (CERN) ; Rossi, Roberto (Sapienza Universita e INFN, Roma I (IT))
Dumps induced by sudden increase of losses in the half-cell 16L2 have been a serious machine limitation during the 2017 run. [...]
CERN-ACC-NOTE-2018-0030. - 2018. - 8 p.
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2018-03-27
16:21
Muon Beam Studies in the H4 beam line and the Gamma Irradiation Facility (GIF++) / Margraf, Rachel ; Charitonidis, Nikolaos (CERN)
In this note, we present detailed simulation results for the trajectory of a muon beam, traversing beam zones PPE-134 and PPE-154, produced by a 150 GeV positive hadron beam incident on collimators 9 & 10 in the H4 beam line when these collimators are placed off-beam axis to stop all hadrons and electrons [...]
CERN-ACC-NOTE-2018-0029. - 2018. - 25 p.
Muon Beam Studies in the H4 beam line and the Gamma Irradiation Facility (GIF++)

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