{"id":3416,"date":"2025-10-04T11:36:35","date_gmt":"2025-10-04T09:36:35","guid":{"rendered":"https:\/\/www.swissrocketman.fr\/Wordpress\/?p=3416"},"modified":"2025-10-04T13:23:21","modified_gmt":"2025-10-04T11:23:21","slug":"lasers-de-calibration-detecteur-ua1-lep-cern-81","status":"publish","type":"post","link":"https:\/\/www.swissrocketman.fr\/Wordpress\/?p=3416","title":{"rendered":"Lasers de calibration d\u00e9tecteur UA1 LEP (CERN 81)"},"content":{"rendered":"
<\/div><\/div><\/div><\/div>\n

Notice historique : Contrat CERN n\u00b0 590 255\/EF<\/h1>\n

Objet : D\u00e9veloppement et fourniture de lasers de calibration pour le d\u00e9tecteur UA1<\/strong><\/h3>\n

R\u00e9f\u00e9rence<\/h3>\n
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  • \n

    Contrat n\u00b0 590 255\/EF<\/strong><\/h3>\n<\/li>\n
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    Signataire : Arnold NERACHER<\/strong>, ing\u00e9nieur ind\u00e9pendant<\/h3>\n<\/li>\n
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    Organisme : CERN \u2013 Organisation europ\u00e9enne pour la recherche nucl\u00e9aire<\/strong><\/h3>\n<\/li>\n
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    Date : 22\/04\/1981<\/h3>\n<\/li>\n<\/ul>\n

    Contexte<\/h3>\n

    Le d\u00e9tecteur UA1<\/strong>, install\u00e9 sur le collisionneur SPS proton\u2013antiproton<\/strong> du CERN au d\u00e9but des ann\u00e9es 1980, a jou\u00e9 un r\u00f4le central dans la d\u00e9couverte des bosons W et Z (Prix Nobel de physique 1984 attribu\u00e9 \u00e0 Carlo Rubbia et Simon van der Meer).
    Afin d\u2019assurer la pr\u00e9cision de la chambre \u00e0 d\u00e9rive centrale<\/strong> (central drift chamber), un syst\u00e8me de calibration par lasers puls\u00e9s<\/strong> fut mis en place. Ces lasers envoyaient des impulsions lumineuses contr\u00f4l\u00e9es pour simuler les trajectoires de particules et calibrer la r\u00e9ponse \u00e9lectronique du d\u00e9tecteur.<\/h3>\n

    R\u00f4le du contrat<\/h3>\n
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      Le contrat 590 255\/EF<\/strong> engageait Arnold Neracher<\/strong>, ing\u00e9nieur sp\u00e9cialis\u00e9 en lasers \u00e0 gaz puls\u00e9s (TEA N\u2082, excit\u00e9s \u00e9lectriquement), \u00e0 d\u00e9velopper et fournir une s\u00e9rie de lasers sp\u00e9cifiquement con\u00e7us pour r\u00e9pondre aux besoins du syst\u00e8me UA1.<\/h3>\n<\/li>\n
    • \n

      Au total, 60 lasers<\/strong> furent r\u00e9alis\u00e9s et livr\u00e9s au CERN dans le cadre de ce contrat.<\/h3>\n<\/li>\n
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      Ce syst\u00e8me de calibration permit d\u2019am\u00e9liorer la fiabilit\u00e9 des mesures de trajectoires et l\u2019\u00e9talonnage fin du d\u00e9tecteur central.<\/h3>\n<\/li>\n<\/ul>\n

      Importance technique<\/h3>\n
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        Les lasers de Neracher \u00e9taient bas\u00e9s sur des architectures innovantes de lasers \u00e0 azote puls\u00e9s (TEA, Transversely Excited Atmospheric), capables de d\u00e9livrer des impulsions ultra-br\u00e8ves et r\u00e9p\u00e9titives.<\/h3>\n<\/li>\n
      • \n

        Leur robustesse et leur compacit\u00e9 ont permis d\u2019\u00e9quiper de mani\u00e8re syst\u00e9matique les diff\u00e9rentes sections du d\u00e9tecteur UA1.<\/h3>\n<\/li>\n
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        Ce d\u00e9veloppement illustre la collaboration \u00e9troite entre le CERN et des ing\u00e9nieurs\/entrepreneurs ind\u00e9pendants pour r\u00e9pondre \u00e0 des besoins exp\u00e9rimentaux tr\u00e8s sp\u00e9cifiques.<\/h3>\n<\/li>\n<\/ul>\n

        Sources compl\u00e9mentaires<\/h3>\n
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          CERN-EP\/89-62 : First running experience with the laser calibration system of the UA1 Central Detector<\/em>.<\/h3>\n<\/li>\n
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          Brevets d\u2019Arnold Neracher sur les lasers \u00e0 gaz puls\u00e9s (ex. US4292600, US4367553).<\/h3>\n<\/li>\n
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          Archives personnelles : contrat original CERN 590 255\/EF (collection priv\u00e9e).<\/h3>\n<\/li>\n<\/ul>\n<\/div><\/section><\/div>
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