CERN Accelerating science

All CERN Accelerators documents

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2021-07-22
17:45
Description of beam instabilities in synchrotrons with wakefields and space charge forces using the circulant matrix model / Buffat, X (CERN) ; Métral, E (CERN) ; Gottlob, E (Ecole Polytechnique, Lausanne ; U. Brussels (main)) ; Høgh, C (Ecole Polytechnique, Lausanne ; Imperial Coll., London) ; Oeftiger, A (Darmstadt, GSI ; CERN) ; Pieloni, T (Ecole Polytechnique, Lausanne)
A new model for the description of beam instabilities in synchrotrons featuring wakefields and space charge forces is proposed, using the circulant matrix approach. The predictions of this model are discussed in light of past ones, with a particular emphasis on the possible mitigation of the transverse mode coupling instability by space charge forces. [...]
2021 - 12 p. - Published in : Phys. Rev. Accel. Beams 24 (2021) 060101

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2021-07-22
17:44
Kalman filter-based longitudinal phase-space reconstruction method for hadron machines / Alves, Diogo (CERN) ; Lasocha, Kacper (CERN)
This work proposes a novel longitudinal phase-space reconstruction method for hadron machines. The proposed method is based on a Kalman filter and can therefore provide real-time estimates of the phase-space reconstruction. [...]
2021 - 9 p. - Published in : Phys. Rev. Accel. Beams 24 (2021) 072801 Fulltext: PDF;

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2021-07-22
17:44
High-Temperature Superconductor Coatings for Beam Impedance Reduction in Particle Colliders: Nonlinear Effects / Calatroni, Sergio (CERN) ; Vaglio, Ruggero (CNR-SPIN, Naples ; INFN, Naples)
Coating of surfaces facing particle beams with hightemperature superconductors (HTS) for reducing the beam coupling impedance is being considered for the next generation of hadron colliders, such as the FCC-hh at CERN, where HTS would be exposed to the high-frequency wakefields generated by the particle bunches and to the strong field of the steering magnets. In this frame, we present a simple model for the calculation of the microwave response of HTS exposed to a strong external magnetic field, which takes into account the nonlinearity of the pinning potential of the vortex lattice. [...]
2021 - 8 p. - Published in : IEEE Trans. Appl. Supercond. 31 (2021) 3500208 Fulltext: stamp - HTM; High-Temperature_Superconductor_Coatings_for_Beam_Impedance_Reduction_in_Particle_Colliders_Nonlinear_Effects - PDF;

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2021-07-22
11:38
Local field reconstruction from rotating coil measurements in particle accelerator magnets / Ion, Ion Gabriel (Darmstadt, Tech. U.) ; Liebsch, Melvin (CERN) ; Simona, Abele (Darmstadt, Tech. U. ; Milan, Polytech.) ; Loukrezis, Dimitrios (Darmstadt, Tech. U.) ; Petrone, Carlo (CERN) ; Russenschuck, Stephan (CERN) ; De Gersem, Herbert (Darmstadt, Tech. U.) ; Schöps, Sebastian (Darmstadt, Tech. U.)
In this paper a general approach to reconstruct three dimensional field solutions in particle accelerator magnets from distributed magnetic measurements is presented. To exploit the locality of the measurement operation a special discretization of the Laplace equation is used. [...]
arXiv:2106.15168.- 2021-09-21 - Published in : Nucl. Instrum. Methods Phys. Res., A 1011 (2021) 165580

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2021-07-22
11:37
Performance and luminosity models for heavy-ion operation at the CERN Large Hadron Collider / Bruce, R. (CERN) ; Jebramcik, M.A. (CERN ; DESY) ; Jowett, J.M. (CERN ; Darmstadt, GSI) ; Mertens, T. (Helmholtz-Zentrum, Berlin) ; Schaumann, M. (CERN)
A good understanding of the luminosity performance in a collider, as well as reliable tools to analyse, predict, and optimise the performance, are of great importance for the successful planning and execution of future runs. In this article, we present two different models for the evolution of the beam parameters and the luminosity in heavy-ion colliders. [...]
arXiv:2107.09560.- 2021-07-12 - 24 p. - Published in : Eur. Phys. J. Plus 136 (2021) 745 Fulltext: PDF;

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2021-07-21
17:20
A novel facility for cancer therapy and biomedical research with heavy ions for the South East European International Institute for Sustainable Technologies / Damjanovic, Sanja (SEEIIST Association (CH)) ; Amaldi, Ugo (TERA Foundation (IT)) ; Benedetto, Elena (SEEIIST Association (CH)) ; Bisoffi, Giovanni (Universita e INFN, Legnaro (IT)) ; Dosanjh, Manjit ; Durante, Marco ; Foka, Yiota (GSI - Helmholtzzentrum fur Schwerionenforschung GmbH (DE)) ; Grubling, Peter (SEEIIST Association (CH)) ; Rossi, Sandro ; Sapinski, Mariusz (SEEIIST Association (CH)) et al.
The South East European International Institute for Sustainable Technologies (SEEIIST) proposes the construction of a major joint Research Infrastructure in the region, to rebuild cooperation after the recent wars and overcome lasting consequences like technology deficits and brain drain, having at its core a facility for cancer therapy and biomedical research with heavy ions [...]
CERN-ACC-NOTE-2021-0019 ; NIMMS-Note-005.
- 2021. - 6 p.
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2021-07-21
17:00
The next ion medical machine study at CERN: Towards a next generation cancer research and therapy facility with ion beams / Vretenar, Maurizio (CERN) ; Bencini, Vittorio (TERA Foundation (IT)) ; Khalvati, Mohammad Reza ; Lombardi, Alessandra (CERN) ; Tommasini, Davide (CERN) ; Benedetto, Elena (SEEIIST Association (CH)) ; Sapinski, Mariusz (SEEIIST Association (CH)) ; Foka, Yiota (GSI - Helmholtzzentrum fur Schwerionenforschung GmbH (DE))
Cancer therapy with ions has several advantages over X- ray and proton therapy, but its diffusion remains limited primarily because of the size and cost of the accelerator. [...]
CERN-ACC-NOTE-2021-0018 ; NIMMS-Note-004.
- 2021. - 6 p.
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2021-07-21
16:33
GaToroid - Status and Perspectives / Bottura, Luca (CERN) ; Dutheil, Yann (CERN) ; Felcini, Enrico (EPFL - Ecole Polytechnique Federale Lausanne (CH)) ; Haziot, Ariel (CERN) ; Lehtinen, Tuukka (CERN) ; Tommasini, Davide (CERN) ; Vernassa, Gianluca (INFN e Universita Genova (IT))
We describe in this report the status of the study performed at CERN on GaToroid, an idea of a novel magnetic configuration based on the symmetry properties of a toroidal magnetic field, that could find its use in gantries for hadron therapy. [...]
CERN-ACC-NOTE-2021-0017 ; NIMMS-Note-003 ; EDMS 2444379.
- 2020. - 52 p.
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2021-07-21
16:07
ABERRATION CHROMATIQUE ET D’OUVERTURE DANS UNE LENTILLEO MAGNETIQUE. (additif au rapport HUE 1) / HUE, JEAN ; SEPTIER, ALBERT
CERN-PS-HUE-Sp-1.
- 1956. - 9 p.
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2021-07-21
15:36
BUNCH LENGTHENING AND MICROWAVE INSTABILITY / Sacherer, F J ;
CERN-PS-BR-77-5.
- 1977. - 9 p.
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