CERN Accelerating science

ATS Notes

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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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2018-03-26
16:45
Magnetic Field Measurements of the GOLIATH Magnet in EHN1 / Rosenthal, Marcel (CERN) ; Charitonidis, Nikolaos (CERN) ; Chatzidaki, Panagiota ; Margraf, Rachel ; Wilkens, Henric (CERN) ; Bergsma, Felix (CERN) ; Giudici, Pierre-Ange (CERN)
This note describes the measurement campaign of the magnetic field of the GOLIATH magnet conducted in 2017. [...]
CERN-ACC-NOTE-2018-0028.
- 2018. - 20 p.
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2018-03-23
12:14
Report from LHC MD 2171: Amplitude dependent closest tune approach from normal and skew octupoles / Maclean, Ewen Hamish (CERN) ; Tomas Garcia, Rogelio (CERN) ; Persson, Tobias Hakan Bjorn (CERN) ; Carlier, Felix Simon (Technische Universiteit Delft (NL))
Simulation-based studies predict significant amplitude-dependent closest tune approach can be generated by skew octupole sources in conjunction with their normal octupolar counterparts. [...]
CERN-ACC-NOTE-2018-0027.
- 2018. - 15 p.

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2018-03-08
09:30
LHC MD2877: Beam-beam long range impact on coupling measurements / Wenninger, Jorg (CERN) ; Buffat, Xavier (CERN) ; Carlier, Felix Simon (Technische Universiteit Delft (NL)) ; Coello De Portugal - Martinez Vazquez, Jaime Maria (Universitat Politecnica Catalunya (ES)) ; Fuchsberger, Kajetan (CERN) ; Hostettler, Michi (Universitaet Bern (CH)) ; Persson, Tobias Hakan Bjorn (CERN) ; Tomas Garcia, Rogelio (CERN) ; Valuch, Daniel (CERN) ; Garcia-Tabares Valdivieso, Ana (Universidad Complutense (ES))
The LHC is now operating with a tune separation of ∼0.004 in collision. [...]
CERN-ACC-NOTE-2018-0026.
- 2018. - 11 p.
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2018-03-08
09:26
Average beta-beating from random errors / Tomas Garcia, Rogelio (CERN) ; Garcia-Tabares Valdivieso, Ana (Universidad Complutense (ES)) ; Langner, Andy Sven ; Malina, Lukas (University of Oslo (NO)) ; Franchi, Andrea
The impact of random errors on average β-beating is studied via analytical derivations and simulations. [...]
CERN-ACC-NOTE-2018-0025.
- 2018. - 8 p.
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2018-03-02
12:29
Crystal Collimation Cleaning Measurements with Proton Beams in LHC / Rossi, Roberto (Sapienza Universita e INFN, Roma I (IT)) ; Aberle, Oliver (CERN) ; Andreassen, Odd Oyvind (CERN) ; Butcher, Mark (CERN) ; Dionisio Barreto, Cristovao Andre (CERN) ; Masi, Alessandro (CERN) ; Mirarchi, Daniele (CERN) ; Montesano, Simone (CERN) ; Lamas Garcia, Inigo (CERN) ; Redaelli, Stefano (CERN) et al.
During this MD, performed on July 29th, 2016, bent silicon crystal were tested with proton beams for a possible usage of crystal-assisted collimation. [...]
CERN-ACC-NOTE-2018-0024.
- 2016. - 11 p.
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特輯:
LHC MD Notes (108)