CERN Accelerating science

LHC

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2021-03-06
06:02
A fiber optic sensors monitoring system for the central beam pipe of the CMS experiment / Fienga, Francesco (CERN ; U. Naples (main) ; INFN, Naples) ; Szillasi, Zoltan (Debrecen, Inst. Nucl. Res.) ; Beni, Noemi (CERN) ; Irace, Andrea (Naples U.) ; Gaddi, Andrea (CERN) ; Zeuner, Wolfram (CERN) ; Ball, Austin (CERN) ; Buontempo, Salvatore (CERN ; INFN, Naples) ; Breglio, Giovanni (CERN ; U. Naples (main) ; INFN, Naples)
In this paper we describe the main characteristics and experimental results, recorded in more than four years of data acquisition, of a temperature and strain monitoring system, called i-pipe, based on Fiber Bragg Grating (FBG) sensors arrays applied for the first time to a sector of the Large Hadron Collider (LHC) at the European Organization for Nuclear Research (CERN): the central beam pipe (BP) of the Compact Muon Solenoid (CMS). The monitoring system, consisting of four arrays of 16 FBG sensors each, as better described in the text, is placed on four directives of the LHC section that passes inside the CMS experiment, namely the CMS central BP. [...]
2019 - 6 p. - Published in : Opt. Laser Technol. 120 (2019) 105650

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2021-03-03
09:00
Simulation for mitigating dilution kicker high voltage flashover incidents / Loebner, Alina Melaschenko (Aarhus University (DK))
The bachelor’s thesis covers the development of the project “Simulation for mitigating dilution kicker high voltage flashover incidents” made at CERN. [...]
CERN-ACC-NOTE-2021-0007.
- 2021. - 52 p.
Access to fulltext

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2021-03-03
07:53
Particles of the Universe: an ATLAS Experiment Colouring Book in Finnish | Maailmankaikkeuden hiukkaset: ATLAS-kokeen värityskirja / Anthony, Katarina (Universita degli Studi di Udine (IT)) ; Velho, Mariana (Universidade Nova de Lisboa (PT))
Language: Finnish - The ATLAS Colouring Book (Ages 4+): Explore the world of particles in this free-to-download colouring book! Meet the elementary particles that scientists have discovered – so far! – and learn about the role they play in our Universe..
ATLAS-OUTREACH-2021-012.
- 2021. - 18.
Language: Finnish

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2021-02-26
13:51
ATLAS Experiment Colouring Book in Polish | Kolorowanka eksperymentu ATLAS / Anthony, Katarina (Universita degli Studi di Udine (IT)) ; Velho, Mariana (Universidade Nova de Lisboa (PT))
Language: Polish - The ATLAS Experiment Colouring Book is a free-to-download educational book, ideal for kids aged 5-9. [...]
ATLAS-OUTREACH-2021-011.
- 2021. - 16.
Language: Polish

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2021-02-26
13:42
Particles of the Universe: an ATLAS Experiment Colouring Book in Polish | Cząstki Wszechświata: Kolorowanka Eksperymentu ATLAS / Anthony, Katarina (Universita degli Studi di Udine (IT)) ; Velho, Mariana (Universidade Nova de Lisboa (PT))
Language: Polish - The ATLAS Colouring Book (Ages 4+): Explore the world of particles in this free-to-download colouring book! Meet the elementary particles that scientists have discovered – so far! – and learn about the role they play in our Universe..
ATLAS-OUTREACH-2021-010.
- 2021. - 18.
Language: Polish

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2021-02-20
06:37
Incoherent electron cloud effects in the Large Hadron Collider / Paraschou, K (CERN ; Aristotle U., Thessaloniki) ; Iadarola, G (CERN)
During the operation of the Large Hadron Collider in 2018, the majority of physics data was collected with a beam energy of 6.5 TeV, a bunch spacing of 25 ns and with β-functions in the high luminosity interaction points equal to 30 cm. In this configuration, it was found through several experimental measurements that electron cloud induces a significant degradation of the beam lifetime. [...]
2020 - 7 p. - Published in : 10.23732/CYRCP-2020-009.249 Fulltext: PDF;
In : ICFA mini-Workshop on Mitigation of Coherent Beam Instabilities in Particle Accelerators (MCBI 2019), Zermatt, Switzerland, 23 - 27 Sep 2019, pp.249-255 (CERN-2020-009)

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2021-02-20
06:37
Destabilising effect of resistive transverse dampers / Métral, E (CERN)
A resistive transverse damper is needed for multi-bunch operation in a machine like the CERN LHC and it is very efficient as it considerably reduces the necessary amount of nonlinearities (from octupoles) needed to reach beam stability through Landau damping. However, a resistive transverse damper also destabilizes the single-bunch motion below the transverse mode coupling instability (TMCI) intensity threshold (for zero chromaticity), introducing a new kind of instability, which has been called “ISR instability” (for Imaginary tune Split and Repulsion). [...]
2020 - 6 p. - Published in : 10.23732/CYRCP-2020-009.221 Fulltext: PDF;
In : ICFA mini-Workshop on Mitigation of Coherent Beam Instabilities in Particle Accelerators (MCBI 2019), Zermatt, Switzerland, 23 - 27 Sep 2019, pp.221-226 (CERN-2020-009)

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2021-02-20
06:37
Impact of coherent and incoherent beam-beam effects on the beams stability / Buffat, Xavier (CERN)
Various coherent instability mechanisms involving colliding beams are described together with techniques for their mitigation. They are illustrated with some examples based mostly on the recent experience at the Large Hadron Collider..
2020 - 6 p. - Published in : 10.23732/CYRCP-2020-009.256 Fulltext: PDF;
In : ICFA mini-Workshop on Mitigation of Coherent Beam Instabilities in Particle Accelerators (MCBI 2019), Zermatt, Switzerland, 23 - 27 Sep 2019, pp.256-261 (CERN-2020-009)

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2021-02-20
06:37
Beam transfer function and stability diagram in the Large Hadron Collider / Tambasco, C (Ecole Polytechnique, Lausanne) ; Pieloni, T (Ecole Polytechnique, Lausanne) ; Buffat, X (CERN) ; Métral, E (CERN)
Predictions of transverse instability thresholds in the LHC are based on the computation of Landau damping by calculating the stability diagram (SD). However any modification of the tune spread and/or particle distribution modifies the expected Landau damping in the beams. [...]
2020 - 6 p. - Published in : 10.23732/CYRCP-2020-009.115 Fulltext: PDF;
In : ICFA mini-Workshop on Mitigation of Coherent Beam Instabilities in Particle Accelerators (MCBI 2019), Zermatt, Switzerland, 23 - 27 Sep 2019, pp.115-120 (CERN-2020-009)

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2021-02-18
06:11
Consequences of longitudinal coupled-bunch instability mitigation on power requirements during the HL-LHC filling / Karpov, I (CERN) ; Baudrenghien, P (CERN) ; Medrano, L E Medina (CERN) ; Timko, H (CERN)
During the filling of the Large Hadron Collider (LHC), it is desirable to keep the RF cavity voltage constant both in amplitude and phase to minimize the emittance blow-up and injection losses. To have a constant voltage and to minimize power consumption, a special beam-loading compensation scheme called half-detuning is used in the LHC, for which the cavity fundamental resonant frequency needs to be de-tuned from the RF frequency by an appropriate value. [...]
2020 - 6 p. - Published in : 10.23732/CYRCP-2020-009.312 Fulltext: PDF;
In : ICFA mini-Workshop on Mitigation of Coherent Beam Instabilities in Particle Accelerators (MCBI 2019), Zermatt, Switzerland, 23 - 27 Sep 2019, pp.312-317 (CERN-2020-009)

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