CERN Accelerating science

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1.
Report from LHC MD 3312: Replicating HL-LHC DA / Dilly, Joschua Werner (Humboldt University of Berlin (DE)) ; Albert, Markus (CERN) ; Carlier, Felix Simon (CERN) ; Coello De Portugal - Martinez Vazquez, Jaime Maria ; Dalena, Barbara (Université Paris-Saclay (FR)) ; Fol, Elena (CERN) ; Hofer, Michael (CERN) ; Maclean, Ewen Hamish (CERN) ; Malina, Lukas ; Persson, Tobias Hakan Bjorn (CERN) et al.
During MD3312 on the 30.10.2018 the non-linear conditions in the insertion regions of the planned HL-LHC were replicated to our best knowledge and within the capabilities of the hardware currently available in the LHC: A flat ATS-optics scheme of beta* = 15cm / 60cm in IP1 and IP5 was applied as well as sextupole, octupole and (normal) dodecapole errors were introduced into the machine via the corrector magnets in the interaction regions. [...]
CERN-ACC-NOTE-2022-0021.
- 2022
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2.
Optics Measurement and Correction Strategies for HL-LHC / Buffat, Xavier (CERN) ; Carlier, Felix Simon (CERN) ; Coello De Portugal - Martinez Vazquez, Jaime Maria ; De Maria, Riccardo (CERN) ; Dilly, Joschua Werner (Humboldt University of Berlin (DE)) ; Fol, Elena (CERN) ; Fuster Martinez, Nuria ; Gamba, Davide (CERN) ; Garcia Morales, Hector ; Garcia-Tabares Valdivieso, Ana (Universidad Complutense (ES)) et al.
The baseline strategy for optics commissioning in the HL-LHC era is presented and reviewed in detail, along with recent developments and unsolved matters in the linear and nonlinear optics measurement and correction techniques..
CERN-ACC-2022-0004.
- 2022. - 104 p.
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3.
Optics Measurements and Correction Plans for the HL-LHC / Persson, Tobias (CERN) ; Buffat, Xavier (CERN) ; Carlier, Felix (CERN) ; Coello de Portugal, Jaime Maria (PSI, Villigen) ; De Maria, Riccardo (CERN) ; Dilly, Joschua (CERN) ; Fol, Elena (CERN) ; Gamba, Davide (CERN) ; Garcia Morales, Hector (CERN) ; García-Tabarés Valdivieso, Ana (CERN) et al.
The High Luminosity LHC (HL-LHC) will require stringent optics correction to operate safely and deliver the design luminosity to the experiments. In order to achieve this, several new methods for optics correction have been developed. [...]
2021 - 4 p. - Published in : 10.18429/JACoW-IPAC2021-WEPAB026 Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, Br, 24 - 28 May 2021, pp.2656-2659
4.
LHC 3324: Counteracting coupling decay at injection, / Persson, Tobias Hakan Bjorn (CERN) ; Maclean, Ewen Hamish (CERN) ; Hulpers, Fredrik ; Solfaroli Camillocci, Matteo (CERN) ; Hofer, Michael (CERN) ; Tomas Garcia, Rogelio (CERN) ; Garcia-Tabares Valdivieso, Ana (Universidad Complutense (ES))
The b3 spool-pieces are corrector sextupole magnets (MCS), are designed to correct the b3-error of the main dipoles. [...]
CERN-ACC-NOTE-2021-0008.
- 2021. - 22 p.
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5.
Optics-Measurement-Based BPM Calibration / García-Tabarés Valdivieso, Ana (CERN) ; Tomás, Rogelio (CERN)
Beam position monitors (BPMs) are key elements in accelerator operation, providing essential information about different beam parameters that are directly related to the accelerator performance. In order to obtain an accurate conversion from an induced voltage to the center of charge position, the BPMs have to be calibrated prior to its installation in the accelerator. [...]
2019 - 5 p. - Published in : 10.18429/JACoW-IBIC2019-WEPP034 Fulltext: PDF;
In : 8th International Beam Instrumentation Conference (IBIC 2019), Malmo, Sweden, 8 - 12 Sep 2019, pp.WEPP034
6.
MD 3603: Dynamic Aperture with uncorrected dipole b3 / Hofer, Michael (Vienna University of Technology (AT)) ; Carlier, Felix Simon (Technische Universiteit Delft (NL)) ; Dilly, Joschua Werner (Humboldt University of Berlin (DE)) ; Fol, Elena (Goethe University Frankfurt (DE)) ; Garcia-Tabares Valdivieso, Ana (Universidad Complutense (ES)) ; Maclean, Ewen Hamish (CERN) ; Malina, Lukas (CERN) ; Persson, Tobias Hakan Bjorn (CERN) ; Coello De Portugal - Martinez Vazquez, Jaime Maria ; Solfaroli Camillocci, Matteo (CERN) et al.
The hadron collider options currently investigated as part of the FCC study rely on the use of dipoles with a field strength of 16 T or above in order to achieve the targeted collision energy. [...]
CERN-ACC-NOTE-2020-0049.
- 2020. - 22 p.
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7.
MD4944: Local linear coupling measurement at the IPs / Persson, Tobias Hakan Bjorn (CERN) ; Carlier, Felix Simon (Technische Universiteit Delft (NL)) ; Hofer, Michael (Vienna University of Technology (AT)) ; Maclean, Ewen Hamish (University of Malta (MT)) ; Tomas Garcia, Rogelio (CERN) ; Garcia-Tabares Valdivieso, Ana (Universidad Complutense (ES))
It was observed that a large local linear coupling around IP2 reduced the luminosity during the 2018 ion run. [...]
CERN-ACC-NOTE-2020-0013.
- 2020. - 9 p.
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8.
Optics-measurement-based Beam Position Monitor Calibration. / Garcia-Tabares Valdivieso, Ana
Accurate measurements of the focusing properties of an accelerator are essential for proper operation of a synchrotron, both for the machine protection and for the performance of the experiment [...]
CERN-THESIS-2019-211 - 153 p.

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9.
Optics measurements in the CERN PS Booster using turn-by-turn BPM data / Garcia-Tabares Valdivieso, Ana (UCM, Somosaguas) ; Skowroński, Piotr (CERN) ; Tomás García, Rogelio (CERN)
As part of the LHC Injector Upgrade Project the injection of the CERN PS Booster will be changed to increase intensity and brightness of the delivered beams. The new injection scheme is likely to give rise to beta beating above the required level of 5% and new measurements are required. [...]
CERN-ACC-2019-138.- 2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-MOPGW080 Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.MOPGW080
10.
First High-Intensity Beam Tests with Telescopic Flat Optics at the LHC / Fartoukh, Stephane (CERN) ; Azzopardi, Gabriella (University of Malta (MT)) ; Bruce, Roderik (CERN) ; Buffat, Xavier (CERN) ; Coello De Portugal - Martinez Vazquez, Jaime Maria ; Dilly, Joschua Werner (Ministere des affaires etrangeres et europeennes (FR)) ; Fol, Elena (Johann-Wolfgang-Goethe Univ. (DE)) ; Fuster Martinez, Nuria (CERN) ; Garcia-Tabares Valdivieso, Ana (Universidad Complutense (ES)) ; Hofer, Michael (Vienna University of Technology (AT)) et al.
The paper reports on the first high-intensity beam tests obtained with flat optics in 2018 (MD2148). [...]
CERN-ACC-2019-0052.
- 2019. - 39 p.

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