CERN Accelerating science

Video Lectures

新增:
2020-05-25
14:28
Séminaire CERN contre le COVID-19
2020 - 0:47:48. KT Seminars External link: Event details In : Séminaire CERN contre le COVID-19

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2020-05-22
11:46
CERN against COVID-19 seminar
If you have questions for the speakers, you can submit them here: https://covid19-qa.web.cern.ch    
2020 - 1:05:15. KT Seminars External link: Event details In : CERN against COVID-19 seminar

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2020-05-19
17:05
Extraction of CKM matrix elements in single top quark t-channel production in pp collisions at sqrt(s) = 13 TeV, with CMS / Iorio, Alberto Orso Maria (speaker) (Universita e sezione INFN di Napoli (IT))
A model-independent extraction of the modulus of the Cabibbo– Kobayashi–Maskawa matrix elements Vtb, Vtd, and Vts, is presented for the first time using an event sample enriched in single top quark t-channel events. The analysis uses proton-proton collisions data from the LHC, collected during 2016 with the CMS experiment, at a centre-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 35.9 fb−1. [...]
2020 - 0:58:08. LHC Seminar External link: Event details In : Extraction of CKM matrix elements in single top quark t-channel production in pp collisions at sqrt(s) = 13 TeV, with CMS

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2020-05-15
16:57
Appendix A - A digression on beam optics: stability, discrete formalism and chaotic behaviour / Todesco, Ezio (speaker) (CERN)
In this first Appendix we make a digression on the equations of motion that rule the oscillations of particles in a magnetic lattice. We first present the analogy with optics, showing the similarities and the differences with beam dynamics. We then introduce the discrete methods to solve the equations for particle oscillations. [...]
2020 - 1:16:46. Masterclass - Superconducting Accelerator Magnets External link: Event details In : Appendix A - A digression on beam optics: stability, discrete formalism and chaotic behaviour

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2020-05-14
15:00
Unit 3 - The multipolar expansion of magnetic field / Todesco, Ezio (speaker) (CERN)
This unit belongs to the second part of the course, which is focussed on the physics of electromagnets.  In this unit we see how to express the magnetic field shape with a few coefficients, called the multipoles or field harmonics, thanks to the special form of the Maxwell equations. This formulations greatly simplifies the expression and the optimization of magnetic fields [...]
2020 - 1:41:57. Masterclass - Superconducting Accelerator Magnets External link: Event details In : Unit 3 - The multipolar expansion of magnetic field

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2020-05-12
14:54
Probing the evolution of quark-gluon plasma with anisotropic flow and its non-linear modes with ALICE / Zhou, You (speaker) (Niels Bohr Institute (DK))
The primary goal of the ultrarelativistic heavy-ion collision programme at the LHC is to study the properties of the quark-gluon plasma (QGP), a state of strongly interacting matter that exists at high temperatures and energy densities. Anisotropic flow, studied using the anisotropy of the momentum distribution of final state particles, is sensitive to the fluctuating initial geometry of the overlap region of the colliding nuclei, as well as to the properties of the QGP [...]
2020 - 0:54:12. LHC Seminar External link: Event details In : Probing the evolution of quark-gluon plasma with anisotropic flow and its non-linear modes with ALICE

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2020-05-08
14:39
Unit 2 - Luminosity of a collider and specification of the magnets in the interaction region / Todesco, Ezio (speaker) (CERN)
This unit belongs to the first part of the course, which is focussed on the main equations ruling the energy and the luminosity of a particle collider, and to the derivation of the magnet specifications.  In this unit we will review the definition of luminosity, and the equation giving the luminosity as a function of the beam parameters. Moreover, we will make  a summary of the main physical barriers limiting luminosity. We then discuss the details of the optics around the interaction point, showing the principle of beam size reduction through a triplet of quadrupoles. [...]
2020 - 1:22:56. Masterclass - Superconducting Accelerator Magnets External link: Event details In : Unit 2 - Luminosity of a collider and specification of the magnets in the interaction region

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2020-05-07
17:16
Unit 1 - The energy of a circular collider and magnet specifications in the arcs / Todesco, Ezio (speaker) (CERN)
2020 - 1:32:10. Masterclass - Superconducting Accelerator Magnets; Unit 1 - Energy of a synchrotron and magnet specifications in the arcs External links: Talk details; Event details In : Unit 1 - Energy of a synchrotron and magnet specifications in the arcs

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2020-05-06
11:01
Some epidemiological considerations on COVID, mainly in China and Italy / Parisi, Giorgio (speaker) (President of the “Academia dei Lincei”, Dipartimento di Fisica, Università di Roma ``La Sapienza")
I will present some epidemiological considerations on COVID, mainly in China and Italy, paying much attention to systematic errors in the epidemiological data that have many different sources, e.g. underreporting. [...]
2020 - 1:22:11. CERN Colloquium External link: Event details In : Some epidemiological considerations on COVID, mainly in China and Italy

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2020-05-06
10:44
Constraint on the matter-antimatter symmetry-violating phase in neutrino oscillations by the T2K experiment / Sanchez, Federico (speaker) (Universite de Geneve (CH))
The T2K Collaboration has published recently in Nature very exciting results showing the strongest constraint yet on the parameter that governs the breaking of the symmetry between matter and antimatter in neutrino oscillations. T2K has studied how beams of muon neutrinos and antineutrinos transition into electron neutrinos and electron antineutrinos, respectively [...]
2020 - 1:26:04. EP Seminar External link: Event details In : Constraint on the matter-antimatter symmetry-violating phase in neutrino oscillations by the T2K experiment

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