{"id":46173,"date":"2020-09-21T11:34:34","date_gmt":"2020-09-21T09:34:34","guid":{"rendered":"https:\/\/aktuelles.uni-frankfurt.de\/?p=46173"},"modified":"2023-02-22T14:21:20","modified_gmt":"2023-02-22T13:21:20","slug":"physics-collision-movie-with-upgraded-particle-detector-at-cern","status":"publish","type":"post","link":"https:\/\/aktuelles.uni-frankfurt.de\/en\/english\/physics-collision-movie-with-upgraded-particle-detector-at-cern\/","title":{"rendered":"Physics: Collision movie with upgraded particle detector at CERN"},"content":{"rendered":"<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"650\" height=\"450\" src=\"https:\/\/aktuelles.uni-frankfurt.de\/wp-content\/uploads\/2020\/09\/beitragsbild_ALICE_upgrade_Robert_Muenzer.jpg\" alt=\"\" class=\"wp-image-46161\" srcset=\"https:\/\/aktuelles.uni-frankfurt.de\/wp-content\/uploads\/2020\/09\/beitragsbild_ALICE_upgrade_Robert_Muenzer.jpg 650w, https:\/\/aktuelles.uni-frankfurt.de\/wp-content\/uploads\/2020\/09\/beitragsbild_ALICE_upgrade_Robert_Muenzer-300x208.jpg 300w\" sizes=\"(max-width: 650px) 100vw, 650px\" \/><figcaption><em>Working on the ALICE detector under corona conditions: from the left: Robert M\u00fcnzer (Goethe University Frankfurt, GU), Chilo Garabatos (GSI Helmholtzzentrum f\u00fcr Schwerionenforschung), Lars Bratrud (GU), Yiota Chatzidaki (Heidelberg University), Christian Lippmann (GSI). Credit: Robert M\u00fcnzer<\/em><\/figcaption><\/figure><\/div>\n\n\n\n<p><em>Physicists at Goethe\nUniversity lead one of the technical refurbishments of \u201cALICE\u201d for researching\nquark-gluon plasma<\/em><\/p>\n\n\n\n<p>The ALICE experiment at the particle accelerator CERN in Geneva has the aim of providing new insights into an extremely hot and dense state of matter, the quark-gluon plasma. The entire matter of the universe was in this state just a few millionths of a second after the big bang, and the ALICE experiment will help researchers discover how the universe developed out of this primordial soup. An international team of scientists led by the physicist Harald Appelsh\u00e4user from Goethe University Frankfurt have therefore upgraded the centrepiece of the ALICE detector to current state of the art technology.<\/p>\n\n\n\n<p>For the moment, the accelerators at CERN are at rest during the \u201csecond long shutdown\u201d. During this time, the accelerators undergo upgrades and refurbishments so that more particles can be accelerated and the number of collisions will increase in the future. The detectors are also undergoing upgrades. But while the large all-purpose detectors ATLAS and CMS are not scheduled for larger upgrades until the next, and third long shutdown in 2025, the specialised detector ALICE will enter the upcoming measurement campaign already upgraded.<\/p>\n\n\n\n<p>ALICE is a unique project among the\nresearch adventures surrounding CERN\u2019s Large Hadron Collider (LHC). While the\nother three detectors decipher what occurs in collisions of protons, the\nresearchers in the ALICE experiment are concerned with lead ions \u2013 particles\nthat are many times heavier. Each year, the LHC is operated with lead ions for\none month so that the ALICE detector can collect data. The researchers want to\nlearn more about a particular state of matter: quark-gluon-plasma. It is\ncreated inside the ALICE experiment when lead nuclei collide with each other at\nhigh energy and are dissolved into their elementary components for a short\nmoment. In this hot and dense soup of matter, quarks and gluons, otherwise\nfirmly attached in the protons and neutrons, can move around virtually freely.\nWhat happens during the collisions may provide insight into how our universe as\nwe know it today was formed out of a giant primordial out of quark-gluon\nplasma.<\/p>\n\n\n\n<div style=\"height:27px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Recording a movie instead of taking individual\npictures<\/strong><\/h3>\n\n\n\n<p>After the shutdown, the upgraded ALICE\ndetector will show what it can now do: previously, the LHC accelerator\ndelivered 10,000 collisions per second. At 18,000 particles per collision this amounts\nto 180 million particles per second, only a portion of which was able to be\nrecorded by the ALICE detector. After the shutdown, the technological hurdles\nwhich have until now limited the number of recorded collisions will have been\neliminated. The LHC should then deliver 50,000 collisions of lead ions per\nsecond, resulting in 900 million particles per second. \u201cWe want to record all\ncollisions in entirety and, in fact, continuously, in other words, to record a\nmovie instead of individual pictures,\u201d explains Harald Appelsh\u00e4user, Professor\nat the Institute for Nuclear Physics at Goethe University Frankfurt and project\nleader of the subdetector that will make the biggest difference after the\nupgrade.<\/p>\n\n\n\n<div style=\"height:27px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Detector under construction<\/strong><\/h3>\n\n\n\n<p>To achieve this, one of the central\ndetectors of the 26-metre long and 16-metre high ALICE detector complex, the\nTime Projection Chamber (TPC), was removed and carefully brought from the\nunderground detector cavern into a clean room on the surface. Different parts\nthat were developed all over the world during the past several years were\ngradually and carefully installed. Now the technologically upgraded TPC has\nbeen returned to its home at the heart of ALICE.<\/p>\n\n\n\n<p>The highlights are the new readout\nchambers which no longer consist of many fine wires, but basically of about\nfive billion tiny holes. In these holes, the signals of the charged particles\nwill be amplified so that the scientists can precisely calculate the track of\neach particle. These chambers are called \u201cGEMs\u201d \u2013 Gas Electron Multipliers \u2013\nand are a CERN invention which has already found its way into medical\nprocedures. 500,000 channels ensure that nothing escapes the ALICE experiment.\nEach second during the collisions later results in 3.4 terabytes of data. <\/p>\n\n\n\n<p>New procedures must also be developed\nwhich can process this flood of data. With the participation of high-performance\ncomputing expert Professor Volker Lindenstruth and his colleagues, scientists\nfrom Goethe University will be playing a leading role here as well. &nbsp;\u201cWe now have the finest of the fine and look\nforward to the first collisions,\u201d says Appelsh\u00e4user.<\/p>\n\n\n\n<p>The new GEM readout chambers were custom\nfit for the ALICE experiment through testing and development in Germany \u2013 at Goethe\nUniversity Frankfurt as well as at the Bonn and Heidelberg Universities, the\nTechnical University Munich, and the GSI Helmholtzzentrum f\u00fcr\nSchwerionenforschung, and later assembled in different countries which in\naddition to Germany included Hungary, Finland, Romania and the USA. \u201cThe\nlogistics were pretty complicated,\u201d explains project leader Appelsh\u00e4user. \u201cThe\nTPC was brought to the clean room in 2019 that was where we removed the older\nchambers and installed and tested the new ones. Luckily, we had just finished\nbefore the pandemic started.\u201d<\/p>\n\n\n\n<p>During the shutdown ALICE will also\nreceive a new inner tracking chamber, positioned closer to the collision point and\nfurther increasing precision compared to its predecessor. And the detectors\nhave to be precise, for only through exact determination of particle paths and\nparticle energies can conclusions be reached about the first split seconds of\nthe universe.<\/p>","protected":false},"excerpt":{"rendered":"<p>Physicists at Goethe University lead one of the technical refurbishments of \u201cALICE\u201d for researching quark-gluon plasma The ALICE experiment at the particle accelerator CERN in Geneva has the aim of [&hellip;]<\/p>\n","protected":false},"author":8,"featured_media":46161,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_eb_attr":"","_price":"","_stock":"","_tribe_ticket_header":"","_tribe_default_ticket_provider":"","_ticket_start_date":"","_ticket_end_date":"","_tribe_ticket_show_description":"","_tribe_ticket_show_not_going":false,"_tribe_ticket_use_global_stock":"","_tribe_ticket_global_stock_level":"","_global_stock_mode":"","_global_stock_cap":"","_tribe_rsvp_for_event":"","_tribe_ticket_going_count":"","_tribe_ticket_not_going_count":"","_tribe_tickets_list":"[]","_tribe_ticket_has_attendee_info_fields":false,"footnotes":""},"categories":[126,254],"tags":[242],"post_folder":[],"class_list":["post-46173","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-english","category-research","tag-physics"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - 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