CERN Accelerating science

Accelerator Physics

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2018-02-16
06:53
On the impact of non-symplecticity of space charge solvers / Titze, Malte (CERN)
To guarantee long-term reliability in the predictions of a numerical integrator, it is a well-known requirement that the underlying map has to be symplectic. It is therefore important to examine in detail the impact on emittance growth and noise generation in case this condition is violated. [...]
2016 - 4 p. - Published in : 10.18429/JACoW-HB2016-MOPR029 Fulltext: PDF;
In : 57th ICFA Advanced Beam Dynamics Workshop on High-Intensity and High-Brightness Hadron Beams, Malmö, Sweden, 3 - 8 Jul 2016, pp.MOPR029

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2018-02-15
06:04
Identification and reduction of the CERN SPS impedance / Shaposhnikova, Elena (CERN) ; Argyropoulos, Theodoros (CERN) ; Bohl, Thomas (CERN) ; Lasheen, Alexandre (CERN) ; Repond, Joël (CERN) ; Timko, Helga (CERN)
The first SPS impedance reduction programme has been completed in 2001, preparing the ring for its role as an injector of the LHC. This action has eliminated microwave instability on the SPS flat bottom and later nominal beam could be delivered to the LHC. [...]
2016 - 6 p. - Published in : 10.18429/JACoW-HB2016-TUAM3X01 Fulltext: PDF;
In : 57th ICFA Advanced Beam Dynamics Workshop on High-Intensity and High-Brightness Hadron Beams, Malmö, Sweden, 3 - 8 Jul 2016, pp.TUAM3X01

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2018-02-15
06:04
Dynamic beta and beta-beating effects in the presence of the beam-beam interactions / Pieloni, Tatiana (CERN) ; Barranco, Javier (Ecole Polytechnique, Lausanne) ; Buffat, Xavier (CERN) ; Concalves Jorge, Patrik (Ecole Polytechnique, Lausanne) ; Medina Medrano, Luis (CERN) ; Tambasco, Claudia (CERN) ; Tomás, Rogelio (CERN)
The Large Hadron Collider (LHC) has achieved correction of beta beat down to better than 5%. The beam-beam interactions at the four experiments result as extra quadrupole error in the lattice. [...]
2016 - 4 p. - Published in : 10.18429/JACoW-HB2016-MOPR027 Fulltext: PDF;
In : 57th ICFA Advanced Beam Dynamics Workshop on High-Intensity and High-Brightness Hadron Beams, Malmö, Sweden, 3 - 8 Jul 2016, pp.MOPR027

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2018-02-15
06:04
Numerical modeling of fast beam ion instabilities / Mether, Lotta (CERN) ; Iadarola, Giovanni (CERN) ; Rumolo, Giovanni (CERN)
The fast beam ion instability may pose a risk to the operation of future electron accelerators with beams of high intensity and small emittances, including several structures of the proposed CLIC accelerator complex. Numerical models can be used to identify necessary vacuum specifications to suppress the instability, as well as requirements for a possible feedback system. [...]
2016 - 5 p. - Published in : 10.18429/JACoW-HB2016-WEAM4X01 Fulltext: PDF;
In : 57th ICFA Advanced Beam Dynamics Workshop on High-Intensity and High-Brightness Hadron Beams, Malmö, Sweden, 3 - 8 Jul 2016, pp.WEAM4X01

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2018-02-14
06:10
Dispersion free and dispersion target steering experience at CTF3 / Gamba, Davide (CERN ; JAI, UK) ; Burrows, Philip (Oxford U. ; JAI, UK) ; Corsini, Roberto (CERN) ; Persson, Tobias (CERN) ; Skowroński, Piotr (CERN) ; Tecker, Frank (CERN)
One of the goals of the CLIC Test Facility (CTF3) at CERN is to demonstrate the feasibility of the CLIC Drive Beam recombination, which takes place in the Drive Beam Recombination Complex (DBRC). The tight geometry of the DBRC together with its strong optics and the high energy-spread of the beam require a careful control of the beam size along the different sections of the DBRC. [...]
2017 - 4 p. - Published in : 10.18429/JACoW-LINAC2016-MOPRC008 Fulltext: PDF;
In : 28th Linear Accelerator Conference, East Lansing, Michigan, 25 - 30 Sep 2016, pp.MOPRC008

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2018-02-13
06:31
HIE-ISOLDE SC Linac progress and commissioning in 2016 / Venturini Delsolaro, Walter (CERN) ; Bravin, Enrico (CERN) ; Delruelle, Nicolas (CERN) ; Elias, Michal (CERN) ; Fadakis, Eleftherios (CERN) ; Ferreira Somoza, Jose (CERN) ; Formenti, Fabio (CERN) ; Fraser, Matthew (CERN) ; Gayde, Jean-Christophe (CERN) ; Guillotin, Nicolas (CERN) et al.
After the first successful physics run with radioactive ion beams at HIE ISOLDE, in October 2015 [1], the staged deployment of the linac continued in 2016 by adding a second cryomodule and by refurbishing the first one. During the physics run with one cryomodule, the second cryomodule was being assembled. [...]
2017 - 5 p. - Published in : 10.18429/JACoW-LINAC2016-WE1A05 Fulltext: PDF;
In : 28th Linear Accelerator Conference, East Lansing, Michigan, 25 - 30 Sep 2016, pp.WE1A05

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2018-02-13
06:31
S-band booster design and emittance preservation for the Awake $e^-$ injector / Mete Apsimon, Oznur (Lancaster U. ; Cockcroft Inst. Accel. Sci. Tech.) ; Apsimon, Robert (Lancaster U. ; Cockcroft Inst. Accel. Sci. Tech.) ; Burt, Graeme (Lancaster U. ; Cockcroft Inst. Accel. Sci. Tech.) ; Döbert, Steffen (CERN) ; Xia, Guoxing (U. Manchester (main) ; Cockcroft Inst. Accel. Sci. Tech.)
AWAKE is a proton driven plasma wakefield acceleration experiment at CERN which uses the protons from the SPS. It aims to study the self modulation instability of a proton bunch and the acceleration of an externally injected electron beam in the plasma wakefields, during the so called Phase II until the technical stop of LHC and its injector chain (LS2) in 2019. [...]
2017 - 3 p. - Published in : 10.18429/JACoW-LINAC2016-TUPRC016 Fulltext: PDF;
In : 28th Linear Accelerator Conference, East Lansing, Michigan, 25 - 30 Sep 2016, pp.TUPRC016

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2018-01-31
11:43
MD2190: Q" Stabilization during injection / Schenk, Michael (EPFL - Ecole Polytechnique Federale Lausanne (CH)) ; Fartoukh, Stephane (CERN) ; Li, Kevin Shing Bruce (CERN) ; Malina, Lukas (University of Oslo (NO)) ; Metral, Elias (CERN) ; Tomas Garcia, Rogelio (CERN)
This MD is a follow-up study of MD1831, where single bunches were stabilized against impedance-driven instabilities at 6.5 TeV in the LHC with Q''. [...]
CERN-ACC-NOTE-2018-0003.
- 2018. - 11 p.
Full text

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2018-01-31
07:36
Optics and Non-Linear Beam Dynamics at 4 and 6.5 TeV / Tomás, R (CERN) ; Bach, T (CERN) ; Hagen, P (CERN) ; Langner, A (CERN) ; Levinsen, Y I (CERN) ; Mcateer, M J (CERN) ; Maclean, E H (CERN) ; Persson, T H B (CERN) ; Skowronski, P (CERN) ; White, S (CERN)
2012 has been an extraordinary year for the control and understanding of the LHC optics. A record low β-beating of about 7% has been achieved during nominal operation. [...]
Geneva : CERN, 2012 - 12 p. - Published in : (2012) , pp. 171-182 Fulltext: PDF;
In : 4th Evian Workshop on LHC beam operation, Evian-les-Bains, France, 17 - 20 Dec 2012, pp.171-182

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2018-01-31
07:36
Stability of colliding beams at 6.5 TeV / Pieloni, T (CERN) ; Arduini, G (CERN) ; Bruce, R (CERN) ; Herr, W (CERN) ; Metral, E (CERN) ; Mounet, N (CERN) ; Buffat, X (CERN) ; White, S M (CERN)
In this paper we will try to propose some possible scenarios for operation of beams during the betatron squeeze, adjust and stable beam mode at 6.5 TeV energy for after the LS1. The available parameter space in term of intensity, chromaticity, octupole current, damper gain, bunch spacing and length will be explored and conclusions on possible settings for the operation will be based when possible on experience from the LHC physics runs. [...]
Geneva : CERN, 2012 - 8 p. - Published in : (2012) , pp. 101-108 Fulltext: PDF;
In : 4th Evian Workshop on LHC beam operation, Evian-les-Bains, France, 17 - 20 Dec 2012, pp.101-108

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