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Accelerator Physics

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2019-06-03
14:15
Novel beam-based correction and stabilisation methods for particle accelerators / Malina, Lukas
Precise control of beam optics and beam stability is of critical importance for machine protection and performance of today's high-energy particle accelerators [...]
CERN-THESIS-2018-426 ISSN1501-7710/No.2041. - Oslo, Norway : University of Oslo, 2018-10-24. - 134 p.

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2019-05-21
12:15
Characterization of impedance and wakefields of accelerator devices in the short bunch limit and beam dynamics effects for the CLIC Damping Rings / Passarelli, Andrea
The Damping Rings (DRs) complex of the Compact LInear Collider (CLIC) has to provide ultra low emittances to the linear accelerating sections in order to reach a luminosity of $2\times10^{34}$ cm$^2$ s$^{-1}$ at the centre of mass energy $3$ TeV [...]
CERN-THESIS-2019-045 -

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2019-05-20
15:18
Protons Beyond the LHC Injectors Upgrade Project / Koukovini Platia, Eirini (CERN) ; Bartosik, Hannes (CERN) ; Forte, Vincenzo (CERN) ; Giovannozzi, Massimo (CERN) ; Huschauer, Alexander (CERN) ; Lasheen, Alexandre (CERN) ; Rumolo, Giovanni (CERN) ; Chapochnikova, Elena (CERN)
The Large Hadron Collider (LHC) Injectors Upgrade (LIU) project is implementing major changes during the second long shutdown (LS2) across the injectors complex. The main aim of the project is to improve the performance of the accelerator chain for the production of LHC beams [...]
CERN-PBC-REPORT-2019-004.- Geneva : CERN, 2019 - 35. Fulltext: PDF;

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2019-05-17
08:29
Electron Cloud Effects / Iadarola, G (CERN) ; Rumolo, G (CERN)
Secondary electron emission in combination with the elecromagnetic fields generated by a bunched beam can lead to the formation of electron clouds in the beam chambers of particle accelerators. The interaction of the circulating beam with the e-cloud can lead to transverse instabilities, beam losses, transverse emittance degradation. [...]
2018 - 8 p. - Published in : CERN Yellow Rep. Conf. Proc. 1 (2018) 49-56 Fulltext: PDF;
In : ICFA Mini-Workshop on Impedances and Beam Instabilities in particle accelerators, Benevento, Italy, 18 - 22 Sep 2017, pp.49-56 (CERN-2018-003-CP)

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2019-05-16
15:36
Landau Damping for TMCI: with vs. without Transverse Damper / Metral, Elias (CERN)
The Landau damping of the Transverse Mode-Coupling Instability (TMCI) is discussed both without and with a resistive transverse damper. [...]
CERN-ACC-NOTE-2019-0018. - 2019. - 21 p.
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2019-05-16
12:10
Properties of the electromagnetic fields generated by a circular-symmetric e-cloud pinch in the ultra-relativistic limit / Iadarola, Giovanni (CERN)
The electromagnetic fields generated by an electron cloud in the beam pipe of a particle accelerator introduce additional forces in the dynamics of the particle beams, which can be responsible of beam instabilities, beam losses and transverse emittance blow-up [...]
CERN-ACC-NOTE-2019-0017. - 2019. - 10 p.
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2019-05-16
07:39
ERL17 Workshop, WG2 Summary: Optics, Beam Dynamics and Instrumentation / Bogacz, Alex (Jefferson Lab) ; Schulte, Daniel (CERN)
During the workshop a number of interesting projects were discussed: ERL at KEK, ALICE, PERLE, LHeC, eRHIC, CBETA, ERL for MESA and BERLinPro; a nice mixture of future, existing and past facilities. A rather vigorous development of new ERLs is aggressively pushing the limits: maximizing number of passes, maximizing virtual beam power, opening longitudinal acceptance, mitigation of limiting factors: BBU, CSR/microbunching, diagnostics and Instrumentation for multiple beams, multiparticle tracking studies of dark current and halo formation. [...]
2018 - 1 p. - Published in : 10.18429/JACoW-ERL2017-FRIBCC002 Fulltext: PDF;
In : 59th ICFA Advanced Beam Dynamics Workshop on Energy Recovery Linacs, Geneva, Switzerland, 18 - 23 Jun 2017, pp.FRIBCC002

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2019-05-14
16:30
Optimisation of Storage Rings and RF Accelerators via Advanced Optical-Fibre Based Detectors / Kastriotou, Maria
In particle accelerators, diverse causes may lead to the unwanted deviation of the beam particles from the nominal beam orbit and their loss in the machine [...]
CERN-THESIS-2018-415 -

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2019-05-14
06:58
AWAKE Proton Beam Commissioning / Schmidt, Janet (CERN) ; Barrientos, Diego (CERN) ; Barros Marin, Manoel (CERN) ; Biskup, Bartolomej (CERN) ; Boccardi, Andrea (CERN) ; Bogey, Thierry (CERN) ; Bohl, Thomas (CERN) ; Bracco, Chiara (CERN) ; Cettour Cave, Stephane (CERN) ; Damerau, Heiko (CERN) et al.
AWAKE will be the first proton driven plasma wakefield acceleration experiment worldwide. The facility is located in the former CNGS area at CERN and includes a proton, laser and electron beam line merging in a 10 m long plasma cell, which is followed by the experimental diagnostics. [...]
2017 - 4 p. - Published in : 10.18429/JACoW-IPAC2017-TUPIK032 Fulltext: PDF;
In : 8th International Particle Accelerator Conference, Copenhagen, Denmark, 14 - 19 May 2017, pp.TUPIK032

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2019-05-11
06:26
Needs and Solutions for Machine Impedance Reduction / Vollinger, C (CERN) ; Farricker, A (CERN) ; Kaltenbacher, T R (CERN) ; Kramer, P (CERN) ; Popovic, B K (CERN)
Particle beams with highest possible beam intensities are requested nowadays, hence in modern circular accelerators, the consideration of beam coupling impedance issues is of increasing relevance. Classical sources of beam coupling impedance are RF-systems, injection and extraction kickers, but also beam diagnostic elements such as wire scanners where the object itself forms an undesired cavity, and beam pipe transitions, namely tapers or steps. [...]
2018 - 7 p. - Published in : CERN Yellow Rep. Conf. Proc. 1 (2018) 125-131 Fulltext: PDF;
In : ICFA Mini-Workshop on Impedances and Beam Instabilities in particle accelerators, Benevento, Italy, 18 - 22 Sep 2017, pp.125-131 (CERN-2018-003-CP)

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