CERN Accelerating science

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1.
Dynamic Aperture and Frequency Analysis in ELENA with Electron Cooler Magnetic Field Included / Bojtár, Lajos (CERN)
We present a new tracking algorithm and its implementation called SIMPA. It has the unique feature of long-term tracking of charged particles in arbitrary static electromagnetic fields in a symplectic way. [...]
2024 - 5 p. - Published in : JACoW COOL 2023 (2024) TUPAM1R3 Fulltext: PDF;
In : 14th International Workshop on Beam Cooling and Related Topics (COOL '23), Montreux, Switzerland, 8 - 13 Oct 2023, pp.TUPAM1R3
2.
Could "Flakes" of Neutral Paramagnetic or Dipolar Molecules Explain Beam Losses in the LHC? / Franchetti, Giuliano (Darmstadt, GSI ; Frankfurt U., FIAS) ; Zimmermann, Frank (CERN)
"Flakes" of neutral water or oxygen molecules carrying an electric or magnetic dipole moment can be attracted and trapped by the electromagnetic field of the circulating LHC proton beam. The possible presence of such flakes in the vacuum system could explain beam losses and beam instabilities encountered during the 2017 and 2018 LHC runs, and the observed effect of an external magnetic field..
Geneva : JACoW, 2021 - 4 p. - Published in : JACoW IPAC 2021 (2021) 4254-4257 Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, 24 - 28 May 2021, pp.4254-4257
3.
An Insight on the Thermal and Mechanical Numerical Evaluations for the High-Luminosity LHC Crab Cavities / Cano-Pleite, Eduardo (CERN) ; Amorim Carvalho, Alexandre (CERN) ; Artoos, Kurt (CERN) ; Calaga, Rama (CERN) ; Capatina, Ofelia (CERN) ; Capelli, Teddy (CERN) ; Carra, Federico (CERN) ; Dassa, Luca (CERN) ; Garlasché, Marco (CERN) ; Leuxe, Raphael (CERN) et al.
One of the key devices of the HL-LHC project are SRF crab cavities. A cryomodule with two Double Quarter Wave (DQW) crab cavities has been successfully fabricat-ed and tested with beam at CERN whereas the Radio Frequency Dipole (RFD) crab cavities are currently on its fabrication process. [...]
2019 - 6 p. - Published in : (2019) , pp. 931-936 Fulltext: PDF;
In : 19th International Conference on RF Superconductivity, Dresden, Germany, 30 Jun - 05 Jul 2019, pp.931-936
4.
Longitudinal and Quadrupolar Coupling Impedance of an Elliptical Vacuum Chamber With Finite Conductivity in Terms of Mathieu Functions / Migliorati, Mauro (Rome U. ; INFN, Rome ; CERN) ; Biancacci, Nicolo (CERN) ; Palumbo, Luigi (Rome U. ; INFN, Rome) ; Vaccaro, Vittorio (INFN, Naples ; Naples U.)
The resistive wall impedance of an elliptical vacuum chamber in the classical regime with infinite thickness is known analytically for ultra-relativistic beams by means of the Yokoya form factors. Starting from the longitudinal electric field of a point charge moving at arbitrary speed in an elliptical vacuum chamber, which we express in terms of Mathieu functions, in this paper we take into account the finite conductivity of the beam pipe walls and evaluate the longitudinal and quadrupolar impedance for any beam velocity. [...]
IPAC-2018-THPAF036; CERN-ACC-2018-135.- 2018 - 4 p. - Published in : 10.18429/JACoW-IPAC2018-THPAF036 Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.THPAF036
5.
Multiphysics Analysis of Crab Cavities for High Luminosity LHC Upgrade / Kononenko, Oleksiy (SLAC) ; Calaga, Rama (CERN) ; Li, Zenghai (SLAC) ; Zanoni, Carlo (CERN)
Development of the superconducting RF crab cavities is one of the major activities under the high luminosity LHC upgrade project that aims to increase the machine discovery potential. The crab cavities will be used for maximizing and leveling the LHC luminosity hence having tight tolerances for the operating voltage and phase. [...]
NAPAC-2016-MOB2CO04.- 2017 - 3 p. - Published in : 10.18429/JACoW-NAPAC2016-MOB2CO04 Fulltext: PDF; External link: JACoW
In : 2016 North American Particle Accelerator Conference, Chicago, IL, USA, 9 - 14 Oct 2016, pp.MOB2CO04
6.
Pre-alignment of Accelerating Structures for Compact Acceleration and High Gradient using In-situ Radiofrequency Methods / Galindo Munoz, Natalia (CERN) ; Boria, Vicente (Valencia, Polytechnic U.) ; Catalán Lasheras, Nuria (CERN) ; Faus-Golfe, Angeles (Valencia U., IFIC ; Orsay, LAL) ; Grudiev, Alexej (CERN)
To achieve a high accelerating gradient of 100 MV/m, the CLIC project under study at CERN uses a 23 cm long tapered normal-conducting travelling wave Accelerating Structure (AS) operating at 12 GHz. Minimisation of the long-range wakefields (WF) is assured by damping of the HOM through four radial waveguides in each cell without distorting the accelerating mode. [...]
CERN-ACC-2016-199; CLIC-Note-1085.- 2016 - 4 p. - Published in : 10.18429/JACoW-IPAC2016-WEPOR016 Published version from JACoW: PDF;
In : 7th International Particle Accelerator Conference, Busan, Korea, 8 - 13 May 2016, pp.WEPOR016
7.
Bead-Pull Measurement Method and Tuning of a Prototype CLIC Crab Cavity / Wegner, Rolf (CERN) ; Wuensch, Walter (CERN) ; Burt, Graeme (Lancaster U.) ; Woolley, Benjamin (Lancaster U.)
A bead-pull method has been developed which measures in a single bead passage the amplitude and phase advance of deflecting mode travelling wave structures. This bead-pull method has been applied to measure and tune a Lancaster University-designed prototype crab cavity for CLIC. [...]
CERN-ACC-2014-404.- 2014 - 3 p. - Published in : (2014) , pp. MOPP035 Published version from JACoW: PDF; External link: JACoW
In : 27th Linear Accelerator Conference, Geneva, Switzerland, 31 Aug - 5 Sep 2014, pp.MOPP035
8.
Ferrite Material Characterization in a Static Bias Field for the Design of a Tunable Cavity / Eberhardt, Johannes (CERN) ; Caspers, Fritz (CERN) ; Vollinger, Christine (CERN)
During the development of ferrite-loaded accelerating cavities, the electromagnetic properties of the dispersive ferrite material need to be known. We describe a coaxial short-circuit measurement technique to measure the complex permeability of toroidal-shaped samples (127mm outer and 70mm inner diameter) that are exposed to an external magnetic bias field. [...]
2014 - 3 p. - Published in : , pp. THPRI053 Fulltext: PDF; External link: JACoW server
In : 5th International Particle Accelerator Conference, Dresden, Germany, 15 - 20 Jun 2014, pp.THPRI053
9.
Wake Computations for the Beam Positioning Monitors of PETRA III / Bandyopadhyay, Ayan Kumar (Otto-Von-Guericke University, Magdeburg) ; Balewski, Klaus (DESY, Hamburg) ; Joestingmeier, Andreas (Otto-Von-Guericke University, Magdeburg) ; Omar, Abbas (Otto-Von-Guericke University, Magdeburg) ; Wanzenberg, Rainer (DESY, Hamburg)
2006 - 3 p. External link: Published version from JACoW
In : 10th European Particle Accelerator Conference, Edinburgh, UK, 26 - 30 Jun 2006, pp.3326
10.
The Strict Solution of a Radiation Problem in Toroidal Cavity / Harutunyan, Taron Artur (YSU, Yerevan) ; Gazazyan, Edmond David (YerPhI, Yerevan) ; Khojoyan, Martin Avetic (YerPhI, Yerevan)
2006 - 3 p. External link: Published version from JACoW
In : 10th European Particle Accelerator Conference, Edinburgh, UK, 26 - 30 Jun 2006, pp.3260

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