{"id":737,"date":"2021-06-28T17:46:08","date_gmt":"2021-06-28T17:46:08","guid":{"rendered":"https:\/\/www.matterwaveoptics.eu\/?p=737"},"modified":"2021-07-08T14:32:26","modified_gmt":"2021-07-08T14:32:26","slug":"semakin-aleksei-experiments-with-ultra-low-atomic-hydrogen","status":"publish","type":"post","link":"https:\/\/www.matterwaveoptics.eu\/FOMO2022\/fomo2021\/contributed-talks\/fomo2021-abstract\/semakin-aleksei-experiments-with-ultra-low-atomic-hydrogen\/","title":{"rendered":"Semakin, Aleksei &#8212; Experiments with ultra-low atomic hydrogen"},"content":{"rendered":"\n<p class=\"has-text-align-center wp-block-paragraph\"><em>Wihuri Physical Laboratory, Physics and Astronomy department, University of Turku, 20014 Turku, Finland<\/em><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">We designed and constructed of a large magnetic trap for storage and cooling of atomic hydrogen operating in the vacuum space of the dilution refrigerator at temperature of 1.5\u00a0K. Aiming on a largest volume of the trap we implemented octupole configuration of linear currents (Ioffe bars) for radial confinement, combined with two axial pinch solenoids and a 3.5\u00a0T solenoid for cryogenic H dissociator. The octupole magnet is built from 8 race-track coils &#8211; segments which are compressed towards each other with magnetic forces. This provides a mechanically stable and robust construction with a possibility of replacement\/repair of each segment. The trap is thermally linked to the 1\u00a0K pot of a dilution refrigerator with a special care to avoid highly conductive loops in which the eddy currents could severely limit ramping speed of magnetic field. Maximum trap depth of 0.54\u00a0K (0.8\u00a0T) was reached corresponding to an effective volume of 0.5\u00a0l for hydrogen gas at 200\u00a0mK.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Presentation<\/h2>\n\n\n\n<div data-wp-interactive=\"core\/file\" class=\"wp-block-file\"><object data-wp-bind--hidden=\"!state.hasPdfPreview\" hidden class=\"wp-block-file__embed\" data=\"https:\/\/www.matterwaveoptics.eu\/FOMO2022\/wp-content\/uploads\/2021\/07\/FOMO2021-Semakin-Aleksei-\u2014-Experiments-with-ultra-low-atomic-hydrogen.pdf\" type=\"application\/pdf\" style=\"width:100%;height:600px\" aria-label=\"Embed of Embed of FOMO2021-Semakin-Aleksei-\u2014-Experiments-with-ultra-low-atomic-hydrogen..\"><\/object><a href=\"https:\/\/www.matterwaveoptics.eu\/FOMO2022\/wp-content\/uploads\/2021\/07\/FOMO2021-Semakin-Aleksei-\u2014-Experiments-with-ultra-low-atomic-hydrogen.pdf\">FOMO2021-Semakin-Aleksei-\u2014-Experiments-with-ultra-low-atomic-hydrogen<\/a><a href=\"https:\/\/www.matterwaveoptics.eu\/FOMO2022\/wp-content\/uploads\/2021\/07\/FOMO2021-Semakin-Aleksei-\u2014-Experiments-with-ultra-low-atomic-hydrogen.pdf\" class=\"wp-block-file__button\" download>Download<\/a><\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Abstract<\/h2>\n\n\n\n<div data-wp-interactive=\"core\/file\" class=\"wp-block-file\"><object data-wp-bind--hidden=\"!state.hasPdfPreview\" hidden class=\"wp-block-file__embed\" data=\"https:\/\/www.matterwaveoptics.eu\/FOMO2022\/wp-content\/uploads\/2021\/06\/Semakin-Aleksei-Experiments-with-ultra-low-atomic-hydrogen..pdf\" type=\"application\/pdf\" style=\"width:100%;height:600px\" aria-label=\"Embed of Embed of Semakin-Aleksei-Experiments-with-ultra-low-atomic-hydrogen...\"><\/object><a href=\"https:\/\/www.matterwaveoptics.eu\/FOMO2022\/wp-content\/uploads\/2021\/06\/Semakin-Aleksei-Experiments-with-ultra-low-atomic-hydrogen..pdf\">Semakin-Aleksei-Experiments-with-ultra-low-atomic-hydrogen.<\/a><a href=\"https:\/\/www.matterwaveoptics.eu\/FOMO2022\/wp-content\/uploads\/2021\/06\/Semakin-Aleksei-Experiments-with-ultra-low-atomic-hydrogen..pdf\" class=\"wp-block-file__button\" download>Download<\/a><\/div>\n","protected":false},"excerpt":{"rendered":"<p>We designed and constructed of a large magnetic trap for storage and cooling of atomic hydrogen operating in the vacuum space of the dilution refrigerator at temperature of 1.5 K. Aiming on a largest volume of the trap we implemented octupole configuration of linear currents (Ioffe bars) for radial confinement, combined with two axial pinch solenoids and a 3.5 T solenoid for cryogenic H dissociator. The octupole magnet is built from 8 race-track coils &#8211; segments which are compressed towards each other with magnetic forces. This provides a mechanically stable and robust construction with a possibility of replacement\/repair of each segment. The trap is thermally linked to the 1 K pot of a dilution refrigerator with a special care to avoid highly conductive loops in which the eddy currents could severely limit ramping speed of magnetic field. Maximum trap depth of 0.54 K (0.8 T) was reached corresponding to an effective volume of 0.5 l for hydrogen gas at 200 mK. <\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_crdt_document":"","_uag_custom_page_level_css":"","_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[6,18],"tags":[],"class_list":["post-737","post","type-post","status-publish","format-standard","hentry","category-fomo2021-abstract","category-presentations"],"jetpack_featured_media_url":"","uagb_featured_image_src":{"full":false,"thumbnail":false,"medium":false,"medium_large":false,"large":false,"1536x1536":false,"2048x2048":false,"ashe-slider-full-thumbnail":false,"ashe-full-thumbnail":false,"ashe-list-thumbnail":false,"ashe-grid-thumbnail":false,"ashe-single-navigation":false},"uagb_author_info":{"display_name":"Cretan Matterwaves","author_link":"https:\/\/www.matterwaveoptics.eu\/FOMO2022\/author\/bec\/"},"uagb_comment_info":0,"uagb_excerpt":"We designed and constructed of a large magnetic trap for storage and cooling of atomic hydrogen operating in the vacuum space of the dilution refrigerator at temperature of 1.5 K. Aiming on a largest volume of the trap we implemented octupole configuration of linear currents (Ioffe bars) for radial confinement, combined with two axial pinch&hellip;","jetpack_sharing_enabled":true,"publishpress_future_action":{"enabled":false,"date":"2026-08-21 20:30:06","action":"category","newStatus":"draft","terms":[],"taxonomy":"category","extraData":[]},"publishpress_future_workflow_manual_trigger":{"enabledWorkflows":[]},"_links":{"self":[{"href":"https:\/\/www.matterwaveoptics.eu\/FOMO2022\/wp-json\/wp\/v2\/posts\/737","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.matterwaveoptics.eu\/FOMO2022\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.matterwaveoptics.eu\/FOMO2022\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.matterwaveoptics.eu\/FOMO2022\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/www.matterwaveoptics.eu\/FOMO2022\/wp-json\/wp\/v2\/comments?post=737"}],"version-history":[{"count":5,"href":"https:\/\/www.matterwaveoptics.eu\/FOMO2022\/wp-json\/wp\/v2\/posts\/737\/revisions"}],"predecessor-version":[{"id":1024,"href":"https:\/\/www.matterwaveoptics.eu\/FOMO2022\/wp-json\/wp\/v2\/posts\/737\/revisions\/1024"}],"wp:attachment":[{"href":"https:\/\/www.matterwaveoptics.eu\/FOMO2022\/wp-json\/wp\/v2\/media?parent=737"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.matterwaveoptics.eu\/FOMO2022\/wp-json\/wp\/v2\/categories?post=737"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.matterwaveoptics.eu\/FOMO2022\/wp-json\/wp\/v2\/tags?post=737"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}