CERN Accelerating science

Accelerator Physics

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2019-02-21
06:42
First Beam Tests at the CERN SPS of an Electro-Optic Beam Position Monitor for the HL-LHC / Arteche, Alberto (Royal Holloway, U. of London) ; Bashforth, Sophie (JAI, UK) ; Boorman, Gary (Royal Holloway, U. of London ; JAI, UK) ; Bosco, Alessio (Royal Holloway, U. of London ; JAI, UK) ; Chritin, Nicolas (CERN) ; Gibson, Stephen (Royal Holloway, U. of London ; JAI, UK) ; Krupa, Michal (CERN) ; Lefèvre, Thibaut (CERN) ; Levens, Thomas (CERN)
An Electro-Optic Beam Position Monitor is being developed for the HL-LHC, aimed at the detection of high order proton bunch instabilities and as a diagnostic for crabbed bunch rotation. A prototype EO-BPM was installed in the CERN SPS during 2016 and recent first beam tests of the EO pick-up are presented. [...]
2018 - 4 p. - Published in : 10.18429/JACoW-IBIC2017-TUPCF23 Fulltext: PDF;
In : 6th International Beam Instrumentation Conference, Grand Rapids, MI, USA, 20 -24 Aug 2017, pp.TUPCF23

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2019-02-19
04:10
A magnetic spectrometer to measure electron bunches accelerated at AWAKE / AWAKE Collaboration
A magnetic spectrometer has been developed for the AWAKE experiment at CERN in order to measure the energy distribution of bunches of electrons accelerated in wakefields generated by proton bunches in plasma. [...]
arXiv:1902.05752.
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2019-02-12
17:06
MD#2889: 16L2 Event Dynamics and UFO Nature Investigation / Lindstrom, Bjorn Hans Filip (Uppsala University (SE)) ; Apollonio, Andrea (CERN) ; Dziadosz, Martyna (AGH University of Science and Technology (PL)) ; Gorzawski, Arkadiusz (University of Malta (MT)) ; Grob, Laura Katharina ; Holzer, Eva Barbara (CERN) ; Lechner, Anton (CERN) ; Medvedeva, Tatiana (Russian Academy of Sciences (RU)) ; Schmidt, Rudiger (Technische Universitaet Darmstadt (DE)) ; Valette, Matthieu et al.
Micrometer sized particles (UFOs) entering the beam are a known cause of localized beam losses since the beginning of high intensity beam operation, however the origin of these particles is not fully known [...]
CERN-ACC-2019-0032.
- 2019. - 5 p.
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2019-02-08
06:14
Direct Observation of Incoherent Cherenkov Diffraction Radiation in the Visible Range / Kieffer, R (CERN) ; Bartnik, L (Cornell U.) ; Bergamaschi, M (CERN) ; Bleko, V V (Tomsk Polytechnic U.) ; Billing, M (Cornell U.) ; Bobb, L (Diamond Light Source) ; Conway, J (Cornell U.) ; Forster, M (Cornell U.) ; Karataev, P (Royal Holloway, U. of London) ; Konkov, A S (Tomsk Polytechnic U.) et al.
We report on the observation of incoherent Cherenkov radiation emitted by a 5.3 GeV positron beam circulating in the Cornell electron-positron storage ring as the beam passes in the close vicinity of the surface of a fused silica radiator (i.e., at a distance larger than 0.8 mm). The shape of the radiator was designed in order to send the Cherenkov photons towards the detector, consisting of a compact optical system equipped with an intensified camera. [...]
2018 - 6 p. - Published in : Phys. Rev. Lett. 121 (2018) 054802 Fulltext: PDF;

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2019-02-08
06:14
Mapping the Damping Dynamics of Mega-Ampere Electron Pulses Inside a Solid / Shaikh, Moniruzzaman (Tata Inst.) ; Lad, Amit D (Tata Inst.) ; Birindelli, Gabriele (CELIA, Bordeaux) ; Pepitone, Kevin (CERN) ; Jha, Jagannath (Tata Inst.) ; Sarkar, Deep (Tata Inst.) ; Tata, Sheroy (Tata Inst.) ; Chatterjee, Gourab (Tata Inst.) ; Dey, Indranuj (Tata Inst.) ; Jana, Kamalesh (Tata Inst.) et al.
We report the lifetime of intense-laser ($2 \times 10^{19}$ W/cm$^2$) generated relativistic electron pulses in solids by measuring the time evolution of their Cherenkov emission. Using a picosecond resolution optical Kerr gating technique, we demonstrate that the electrons remain relativistic as long as 50 picoseconds—more than 1000 times longer than the incident light pulse. [...]
2018 - 5 p. - Published in : Phys. Rev. Lett. 120 (2018) 065001 Fulltext: PDF;

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2019-02-04
15:25
Detailed review of the LHC optics commissioning for the nonlinear era / Maclean, Ewen Hamish (University of Malta (MT)) ; Tomas Garcia, Rogelio (CERN) ; Carlier, Felix Simon (Technische Universiteit Delft (NL)) ; Coello De Portugal - Martinez Vazquez, Jaime Maria (Universitat Politecnica Catalunya (ES)) ; Fol, Elena (Johann-Wolfgang-Goethe Univ. (DE)) ; Fuchsberger, Kajetan (CERN) ; Garcia-Tabares Valdivieso, Ana (Universidad Complutense (ES)) ; Giovannozzi, Massimo (CERN) ; Hofer, Michael (Vienna University of Technology (AT)) ; Malina, Lukas (CERN) et al.
In 2017, optics commissioning strategy for low-β∗ operation of the CERN Large Hadron Collider (LHC) underwent a major revision. [...]
CERN-ACC-2019-0029.
- 2019.
Full text

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2019-02-01
14:09
Electron beam measurements with beam loss monitors in AWAKE / Verra, Livio
In this thesis I study experimentally electron beam loss signals in AWAKE, the Advanced WAKEfield experiment at CERN [...]
CERN-THESIS-2019-003 -

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2019-02-01
13:41
Beam Loading in a Proton Driven Plasma Wakefield Accelerator / Olsen, Veronica
Plasma wakefield accelerators promise to deliver orders of magnitude higher accelerating gradients than conventional accelerator technology [...]
CERN-THESIS-2018-343 - Oslo, Norway : University of Oslo, 2019-02-25. - 120 p.

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2019-01-30
15:12
Preliminary EIR design including optimized lattice deck: Deliverable D3.3 / Tomas Garcia, Rogelio (CERN) ; Martin, Roman (CERN)
Annotated beam optics and lattice files with specifications of the required magnet parameters (strengths and apertures) including consolidated position and element characteristics. Specification of the required magnet types and quantities including magnet field quality specifications..
CERN-ACC-2019-0018.- Geneva : CERN, 2019 Fulltext: CERN-ACC-2019-0018 - PDF; EuroCirCol-P3-WP3-D3.3_PreliminaryEIRdesignIncludingOptimizedLatticeDeck_V0200 - PDF;

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2019-01-30
14:52
Overview of EIR design options: Deliverable D3.1 / Seryi, Andrei (University of Oxford (GB)) ; Tomas Garcia, Rogelio (CERN)
This document describes the options of EIR design and collider layouts to be considered for further detailed studies. We primarily focus on factors leading to selection of the optimal L* parameter, describe the options considered and the presently selected value, as well as possible further optimization [...]
CERN-ACC-2019-0017.- Geneva : CERN, 2016 Fulltext: PDF;

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