{"id":9546,"date":"2024-01-07T17:26:57","date_gmt":"2024-01-07T17:26:57","guid":{"rendered":"https:\/\/www.istp.cnr.it\/?post_type=product&#038;p=9546"},"modified":"2024-01-07T17:26:57","modified_gmt":"2024-01-07T17:26:57","slug":"long-pulse-d2-and-n2-seeded-discharges-on-the-upper-actively-cooled-tungsten-divertor-of-west","status":"publish","type":"product","link":"https:\/\/www.istp.cnr.it\/it\/research-product\/long-pulse-d2-and-n2-seeded-discharges-on-the-upper-actively-cooled-tungsten-divertor-of-west\/","title":{"rendered":"Long pulse D2 and N2 seeded discharges on the upper actively cooled tungsten divertor of WEST"},"content":{"rendered":"<p>A series of L-mode discharges in upper single null configuration with more than 30 s duration were performed in the WEST tokamak with the strike line on actively cooled tungsten-coated divertor components. This series of discharges accumulated 20 min of plasma and a strike point fluence of \u00bb \u00b4 &#8211; 2 10 m25 2 in two days of operation in attached conditions. The discharges showed good density control, no tungsten accumulation and overall very benign thermal behaviour of the upper divertor. A subset of the discharges were seeded with nitrogen either in the divertor or midplane region to study plasma-wall interaction and associated ammonia formation in this weakly pumped scenario with all-tungsten plasma-facing components. While ammonia signals remained too weak for useful analysis, a strong dependence of nitrogen plasma penetration efficiency and residence time on the injection location was found. This hints towards a currently underestimated plasma-near nitrogen reservoir in these tokamak discharges in divertor configuration.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Dittmar T.; Loarer T.; Drenik A.; Bourdelle C.; Brezinsek S.; Desgranges C.; Douai D.; Fedorczak N.; Guirlet R.; Gunn J.; Meyer O.; Laguardia L.; Tsitrone E.; the WEST team<\/p>\n","protected":false},"featured_media":1294,"comment_status":"closed","ping_status":"open","template":"","meta":[],"product_cat":[574],"product_tag":[1198,1199,1200,1201,1202],"class_list":["post-9546","product","type-product","status-publish","has-post-thumbnail","hentry","product_cat-journal-articles","product_tag-tungsten-divertor","product_tag-west-tokamak","product_tag-long-pulse-operation","product_tag-nitrogen-seeding","product_tag-ammonia-formation","prodpage-style2"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.istp.cnr.it\/it\/wp-json\/wp\/v2\/product\/9546","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.istp.cnr.it\/it\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/www.istp.cnr.it\/it\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/www.istp.cnr.it\/it\/wp-json\/wp\/v2\/comments?post=9546"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.istp.cnr.it\/it\/wp-json\/wp\/v2\/media\/1294"}],"wp:attachment":[{"href":"https:\/\/www.istp.cnr.it\/it\/wp-json\/wp\/v2\/media?parent=9546"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/www.istp.cnr.it\/it\/wp-json\/wp\/v2\/product_cat?post=9546"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/www.istp.cnr.it\/it\/wp-json\/wp\/v2\/product_tag?post=9546"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}