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Accelerator Physics

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2019-11-13
11:23
LHeC optics with β∗ = 10 cm and L∗ = 15 m / Cruz Alaniz, Emilia (University of Liverpool (GB)) ; Martin, Roman ; Tomas Garcia, Rogelio (CERN)
New proton optics have been designed for LHeC taking into account new final focus magnet designs and ensuring a full compatibility with HL-LHC version 1.3. [...]
CERN-ACC-NOTE-2019-0049. - 2019. - 17 p.
Full text

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2019-11-13
09:45
Optics-measurement-based Beam Position Monitor Calibration. / Garcia-Tabares Valdivieso, Ana (Universidad Complutense (ES))
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. Measurement of linear optics functions based on turn-by-turn measurements has been developed continuously in pursuit of more accurate results. [...]
CERN-THESIS-2019-211.- 153 p. Fulltext: PDF; External link: Approve this document (restricted)

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2019-11-13
07:58
Modelling and Control of the HL-LHC Nested Magnet Circuits at CERN / Yammine, Samer (CERN) ; Thiesen, Hugues (CERN)
In the scope of the High Luminosity - Large Hadron Collider project at CERN, six new superconducting quadrupole electromagnets are required for the final focusing of the beam before proton-to-proton collisions. To optimize the powering scheme, the quadrupoles will be powered in series by one high-current two-quadrant converter. [...]
2019 - 6 p. - Published in : 10.1109/COMPEL.2019.8769677
In : 20th Workshop on Control and Modeling for Power Electronics, Toronto, Canada, 16 - 19 Jun 2019, pp.1-6

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2019-11-13
07:58
Combined Testing And Validation Strategy For The New LHC Blm Processing Module / Schramm, V (CERN) ; Saccani, M (CERN) ; Viganò, W (CERN) ; Bertsche, B (Stuttgart U.)
A comprehensive strategy to test a new digital acquisition board has been implemented by the Beam Instrumentation Group of the European Organization for Nuclear Research (CERN) as part of a wider methodology for the design, production, test, and operation of high dependability electronic systems. This includes test benches for component and functional testing during production, as well as for validation and burn-in upon reception. [...]
2019 - 7 p. - Published in : 10.1109/RAMS.2019.8769268
In : 65th Annual Reliability & Maintainability Symposium, Orlando, USA, 28 - 31 Jan 2019, pp.1-7

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2019-11-01
06:03
SixTrack project: Status, runtime environment, and new developments / De Maria, Riccardo (CERN) ; Andersson, Joel (CERN) ; Field, Laurence (CERN) ; Giovannozzi, Massimo (CERN) ; Hermes, Pascal (CERN) ; Hoimyr, Nils (CERN) ; Iadarola, Giovanni (CERN) ; Kostoglou, Sofia (CERN) ; Maclean, Ewen (CERN ; U. Malta) ; McIntosh, Eric (CERN) et al.
SixTrack is a single-particle tracking code for high-energy circular accelerators routinely used at CERN for the Large Hadron Collider (LHC), its luminosity upgrade (HL-LHC), the Future Circular Collider (FCC), and the Super Proton Synchrotron (SPS) simulations. The code is based on a 6D symplectic tracking engine, which is optimised for long-term tracking simulations and delivers fully reproducible results on several platforms. [...]
2019 - 7 p. - Published in : 10.18429/JACoW-ICAP2018-TUPAF02 Fulltext from publisher: PDF;
In : 13th International Computational Accelerator Physics Conference (ICAP 2018), Key West, FL, USA, 20 - 24 Oct 2018, pp.TUPAF02

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2019-11-01
06:03
Space charge and transverse instabilities at the CERN SPS and LHC / Métral, Elias (CERN) ; Amorim, David (CERN) ; Arduini, Gianluigi (CERN) ; Bartosik, Hannes (CERN) ; Benedetto, Elena (CERN) ; Burkhardt, Helmut (CERN) ; Li, Kevin (CERN) ; Oeftiger, Adrian (CERN) ; Quatraro, Diego (CERN) ; Rumolo, Giovanni (CERN) et al.
At the CERN accelerator complex, it seems that only the highest energy machine in the sequence, the LHC, with space charge (SC) parameter close to one, sees the predicted beneficial effect of SC on transverse coherent instabilities. In the other circular machines of the LHC injector chain (PSB, PS and SPS), where the SC parameter is much bigger than one, SC does not seem to play a major (stabilising) role, and it is maybe the opposite in the SPS. [...]
2019 - 7 p. - Published in : 10.18429/JACoW-ICAP2018-SUPAG01 Fulltext from publisher: PDF;
In : 13th International Computational Accelerator Physics Conference (ICAP 2018), Key West, FL, USA, 20 - 24 Oct 2018, pp.SUPAG01

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2019-11-01
06:03
HOM-mitigation for future SPS 33-cell 200 MHz accelerating structures / Kramer, Patrick (CERN ; RWTH Aachen U.) ; Vollinger, Christine (CERN)
The CERN SPS 200 MHz travelling wave (TW) accelerating structures pose an intensity limitation for the planned High Luminosity (HL-) LHC upgrade. Higher-order modes (HOMs) around 630 MHz have been identified as one of the main sources of longitudinal multi-bunch instabilities. [...]
2019 - 7 p. - Published in : 10.18429/JACoW-ICAP2018-SAPAG04 Fulltext from publisher: PDF;
In : 13th International Computational Accelerator Physics Conference (ICAP 2018), Key West, FL, USA, 20 - 24 Oct 2018, pp.SAPAG04

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2019-10-31
09:54
Simulations of longitudinal beam stabilisation in the CERN SPS with BLonD / Repond, Joël (CERN ; Ecole Polytechnique, Lausanne) ; Iliakis, Konstantinos (CERN) ; Schwarz, Markus (CERN) ; Shaposhnikova, Elena (CERN)
The Super Proton Synchrotron (SPS) at CERN, the Large Hadron Collider (LHC) injector, will be pushed to its limits for the production of the High Luminosity LHC proton beam while beam quality and stability in the longitudinal plane are influenced by many effects. Particle simulation codes are an essential tool to study the beam instabilities. [...]
2019 - 7 p. - Published in : 10.18429/JACoW-ICAP2018-TUPAF06 Fulltext from publisher: PDF;
In : 13th International Computational Accelerator Physics Conference (ICAP 2018), Key West, FL, USA, 20 - 24 Oct 2018, pp.TUPAF06

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2019-10-26
07:04
Qualification and Calibration of Single-Mode Phosphosilicate Optical Fiber for Dosimetry at CERN / Di Francesca, Diego (CERN) ; Li Vecchi, Gaetano (CERN) ; Girard, Sylvain (St. Etienne U.) ; Morana, Adriana (St. Etienne U.) ; Reghioua, Imene (St. Etienne U.) ; Alessi, Antonino (St. Etienne U.) ; Hoehr, Cornelia (TRIUMF) ; Robin, Thierry (Unlisted, FR) ; Kadi, Yacine (CERN) ; Brugger, Markus (CERN)
We report the results of several complementary radiation tests to qualify and calibrate a highly radiation sensitive Single-Mode (SM) Optical Fiber (OF) for distributed dosimetry application at CERN. The Radiation Induced Attenuation (RIA) is the physical phenomenon used to evaluate the Total Ionizing Dose (TID) received by the OF sensor. [...]
2019 - 7 p. - Published in : J. Lightwave Technol. 37 (2019) 4643-4649

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2019-10-25
09:44
New spiral beam screen design for the FCC-hh injection kicker magnet / Chmielinska, Agnieszka (CERN ; Ecole Polytechnique, Lausanne) ; Barnes, Michael (CERN)
The injection kicker system for the Future Circular Collider (FCC-hh) must satisfy demanding requirements. To achieve low pulse ripple and fast field rise and fall times, the injection system will use ferrite loaded transmission line type magnets. [...]
2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-MOPGW074 Preprint: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.MOPGW074

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