{"id":25841,"date":"2016-03-10T23:53:59","date_gmt":"2016-03-10T22:53:59","guid":{"rendered":"http:\/\/dfg-lfa.org\/?p=25841"},"modified":"2021-07-26T09:33:02","modified_gmt":"2021-07-26T07:33:02","slug":"genffahrt-der-klassen-ts1-und-ts2","status":"publish","type":"post","link":"https:\/\/dfg-lfa.org\/fr\/2016\/03\/genffahrt-der-klassen-ts1-und-ts2\/","title":{"rendered":"Voyage \u00e0 Gen\u00e8ve des classes de TS1 et TS2"},"content":{"rendered":"<p><figure id=\"attachment_25849\" aria-describedby=\"caption-attachment-25849\" style=\"width: 300px\" class=\"wp-caption alignleft\"><a href=\"https:\/\/dfg-lfa.org\/wp-content\/uploads\/Genf1.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-25849\" title=\"Genf\" src=\"https:\/\/dfg-lfa.org\/wp-content\/uploads\/Genf1-300x168.jpg\" alt=\" \" width=\"300\" height=\"168\" srcset=\"https:\/\/dfg-lfa.org\/wp-content\/uploads\/Genf1-300x168.jpg 300w, https:\/\/dfg-lfa.org\/wp-content\/uploads\/Genf1-150x84.jpg 150w, https:\/\/dfg-lfa.org\/wp-content\/uploads\/Genf1-590x331.jpg 590w, https:\/\/dfg-lfa.org\/wp-content\/uploads\/Genf1.jpg 800w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><figcaption id=\"caption-attachment-25849\" class=\"wp-caption-text\"> <\/figcaption><\/figure><\/p>\n<p>Dans le cadre d&rsquo;un voyage \u00e0 Gen\u00e8ve, les \u00e9l\u00e8ves des classes de TS1 et TS2 ont eu la possibilit\u00e9 d&rsquo;avoir un aper\u00e7u de la recherche moderne en visitant le CERN (Conseil europ\u00e9en pour la recherche nucl\u00e9aire) et de la politique internationale \u00e0 l&rsquo;Office des Nations unies.<\/p>\n<p><strong>17 F\u00e9vrier 2016 &#8211; Visite de la ville<\/strong><\/p>\n<p>Apr\u00e8s un voyage en bus de 6 heures et apr\u00e8s nous \u00eatre install\u00e9s dans l&rsquo;auberge de jeunesse situ\u00e9e au centre de la ville, nous nous sommes mis en route pour visiter Gen\u00e8ve  sous la direction de Mme Bischoff et pour d\u00e9couvrir ses plus beaux monuments, comme par exemple le lac de Gen\u00e8ve avec sa grande fontaine, la Cath\u00e9drale ou la place de la R\u00e9forme. Le soir, nous avons eu la possibilit\u00e9 de terminer la visite de la ville par nous m\u00eames.<!--more--><\/p>\n<figure id=\"attachment_25851\" aria-describedby=\"caption-attachment-25851\" style=\"width: 590px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/dfg-lfa.org\/wp-content\/uploads\/Genf2.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"size-large wp-image-25851\" title=\"Genf\" src=\"https:\/\/dfg-lfa.org\/wp-content\/uploads\/Genf2-590x163.jpg\" alt=\" \" width=\"590\" height=\"163\" srcset=\"https:\/\/dfg-lfa.org\/wp-content\/uploads\/Genf2-590x163.jpg 590w, https:\/\/dfg-lfa.org\/wp-content\/uploads\/Genf2-150x41.jpg 150w, https:\/\/dfg-lfa.org\/wp-content\/uploads\/Genf2-300x83.jpg 300w, https:\/\/dfg-lfa.org\/wp-content\/uploads\/Genf2.jpg 800w\" sizes=\"auto, (max-width: 590px) 100vw, 590px\" \/><\/a><figcaption id=\"caption-attachment-25851\" class=\"wp-caption-text\"> <\/figcaption><\/figure>\n<p><strong>18 F\u00e9vrier 2016 &#8211; Visite des bureaux de l&rsquo;ONU et du CERN<\/strong><\/p>\n<figure id=\"attachment_25857\" aria-describedby=\"caption-attachment-25857\" style=\"width: 300px\" class=\"wp-caption alignright\"><a href=\"https:\/\/dfg-lfa.org\/wp-content\/uploads\/Genf3.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-25857\" title=\"Genf\" src=\"https:\/\/dfg-lfa.org\/wp-content\/uploads\/Genf3-300x168.jpg\" alt=\" \" width=\"300\" height=\"168\" srcset=\"https:\/\/dfg-lfa.org\/wp-content\/uploads\/Genf3-300x168.jpg 300w, https:\/\/dfg-lfa.org\/wp-content\/uploads\/Genf3-150x84.jpg 150w, https:\/\/dfg-lfa.org\/wp-content\/uploads\/Genf3-590x331.jpg 590w, https:\/\/dfg-lfa.org\/wp-content\/uploads\/Genf3.jpg 853w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><figcaption id=\"caption-attachment-25857\" class=\"wp-caption-text\"> <\/figcaption><\/figure>\n<p>Nous avons pass\u00e9 la matin\u00e9e dans le bureau des Nations Unies: gr\u00e2ce \u00e0 une visite guid\u00e9e du palais nous avons pu d\u00e9couvrir quelques-unes des 35 salles de conf\u00e9rence, orn\u00e9es d&rsquo;oeuvres d&rsquo;art donn\u00e9es en cadeau par les pays membres.<\/p>\n<p>Apr\u00e8s une promenade dans le jardin botanique et un d\u00e9jeuner rapide, nous nous sommes mis en route pour le conseil europ\u00e9en de la recherche nucl\u00e9aire, le CERN. L\u00e0-bas nous attendait Michael Winn, un ancien \u00e9l\u00e8ve du LFA qui nous a pr\u00e9sent\u00e9 son travail de physicien. Il nous a d\u00e9crit le quotidien des employ\u00e9s du plus grand centre de recherche fondamentale du monde. Puis, nous avons form\u00e9 de plus petits groupes et Michael et deux de ses coll\u00e8gues nous ont montr\u00e9 les lieux de cr\u00e9ation du World Wide Web, le LEIR (Long Energy Ion Ring- un acc\u00e9l\u00e9rateur de particules dont les ions de plomb alimentent l&rsquo;anneau acc\u00e9l\u00e9rateur) et une exposition sur le LHC (Large Hadron Collider, un acc\u00e9l\u00e9rateur de particules circulaire de 27 km de long).<\/p>\n<p>Pour appr\u00e9cier l&rsquo;atmosph\u00e8re scientifique un peu plus longtemps, nous avons mang\u00e9 ce soir-l\u00e0 dans une des cantines du CERN, avant de nous promener \u00e0 nouveau dans Gen\u00e8ve.<\/p>\n<p><strong>19 F\u00e9vrier 2016 &#8211; Visite du d\u00e9tecteur de particules ALICE <\/strong><\/p>\n<p>Le meilleur moment de notre s\u00e9jour \u00e0 Gen\u00e8ve a s\u00fbrement \u00e9t\u00e9 la descente dans un puits de 60m de profondeur vers le d\u00e9tecteur de particules de l&rsquo;exp\u00e9rimentation ALICE. Comme l&rsquo;acc\u00e9l\u00e9rateur a \u00e9t\u00e9 \u00e9teint en d\u00e9cembre 2015, il est maintenant possible d&rsquo;en faire la maintenance et la visite . Mais lorsque celui-ci est enclench\u00e9, le champ magn\u00e9tique de 8 Tesla\u00a0 et une haute exposition aux rayons rendent toute visite impossible.<\/p>\n<p>ALICE est un d\u00e9tecteur de 16 m de large et de 25m de long, qui est entour\u00e9 de blocs de b\u00e9ton pour prot\u00e9ger des rayons.A travers un conduit de quelques centim\u00e8tres de large seulement, des ions sont lanc\u00e9s \u00e0 grande vitesse dans des directions oppos\u00e9es de fa\u00e7on \u00e0 ce qu&rsquo;ils entrent en collision. Gr\u00e2ce \u00e0 ce proc\u00e9d\u00e9, on peut \u00e9tudier les plus petites particules de la mati\u00e8re pour comprendre comment est construit notre monde. Malheureusement, nous n&rsquo;avons pu observer ce d\u00e9tecteur que de l&rsquo;ext\u00e9rieur, vu qu&rsquo;il faudrait 5 jours pour l&rsquo;ouvrir en raison des blocs de b\u00e9ton \u00e0 d\u00e9placer.<\/p>\n<p>En conclusion, nous pouvons dire que, gr\u00e2ce \u00e0 ce voyage, nous avons pu avoir un aper\u00e7u de la recherche moderne. Cela nous a aussi permis de comprendre comment les th\u00e9ories que nous avons partiellement vues en cours sont mises en pratique au CERN. En outre, nous avons pu approcher les meilleurs physiciens du monde et voir quel est leur quotidien. Cette visite a \u00e9t\u00e9 impressionnante et nous la referions volontiers, si nous en avions la possibilit\u00e9 et si nos connaissances pr\u00e9alables dans ce domaine \u00e9taient plus vastes.<\/p>\n<p>Nous remercions Michael Winn et ses coll\u00e8gues Alexander et Felix mais aussi les professeurs qui nous ont accompagn\u00e9s, Mme Bischoff et Mme Boubakri.<\/p>\n<p>Les lecteurs int\u00e9ress\u00e9s peuvent  <a href=\"https:\/\/www.google.com\/maps\/@46.2516866,6.0208045,3a,75y,306.55h,84.7t\/data=!3m7!1e1!3m5!1sE_gmTqm0tFwAAAQJODm60Q!2e0!3e2!7i13312!8i6656\">ici<\/a> faire une visite virtuelle dans ALICE et s&rsquo;imaginer l&rsquo;exp\u00e9rimentation ou m\u00eame explorer l&rsquo;ensemble du tunnel long de 27 km.<\/p>\n<p style=\"text-align: right;\"><em>Marie Stiefel, Vincent Ried, Lukas Bischof<\/em><\/p>\n<p><\/p>\n<div class=\"shariff shariff-align-left shariff-widget-align-left shariff-buttonstretch\" style=\"display:none\"><ul class=\"shariff-buttons theme-white 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