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Accueil > Séminaires et conférences

Séminaires et conférences

par Francois Legrand - 1er février 2011

Aujourd'hui Mardi 23 Avril 2024

  • Séminaire
    amphi Charpak
    2024-04-22 à 14:00

    A 1.20 m diameter auxiliary telescope equipped with a slitless spectrograph has been installed near the main 8.40 m telescope of the Rubin-LSST project. This device is designed to monitor variations in the transparency of the atmosphere as a function of wavelength and time, in order to know in real time the effective shape of the passbands of the main telescope.
    The spectrograph initially designed on the basis of a periodic grating was unable to obtain a good quality spectrum over the entire wavelength range (400nm to 1050nm) for reasons that will be explained in the seminar.
    We have developed a thin dispersive holographic optical element, which has been operational since February 2021, which has not only enabled us to obtain spectra with the best possible resolution, but also with a diffraction efficiency that is almost double that of the initial device.
    I will describe the stages of this project, the objectives of which are to achieve photometric accuracy of the order of one per thousand with the Rubin-LSST main telescope, and to improve the performance of images taken under non-photometric conditions.
     


Prochainement

  • Evénement
    Higgs 12-22-2-28
    2024-04-23 à 10:30

    Join Zoom Meeting
    https://cern.zoom.us/j/94940524377?pwd=dnI4NnZUWGNMN1ZpRFJncFU1ZlMrQT09

     

  • Evénement
    2024-04-24 à 10:00

    Topic: LPNHE-neutrino
    Time: This is a recurring meeting Meet anytime

    Join Zoom Meeting
    https://cern.zoom.us/j/91824390474?pwd=Yy8zSGljWFM4WGVtKy9yN0hFN3ZaZz09

    Meeting ID: 918 2439 0474
    Passcode: 59057139

  • Séminaire
    amphi Charpak
    2024-04-29 à 14:00

    The production of cold antihydrogen atoms at CERN's Antiproton Decelerator (AD) has opened up the possibility to perform direct measurements of the Earth's gravitational acceleration on antimatter bodies. This is the main goal of the AEgIS, ALPHA-g and GBAR collaborations: to measure the value of g, using different approaches. These approaches, both continuous and pulsed, as well as a first result by the ALPHA-g collaboration, will be presented and discussed. Further physics directions also related to inertial sensing, in particular of the AEgIS collaboration relying on pulsed formation and manipulation processes, will also be touched upon, as they also open up unexplored venues in nuclear physics and in novel precision tests of fundamental symmetries.


Planning des salles du LPNHE
Mardi 23 Avril 2024

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