{"id":1936,"date":"2017-06-03T18:33:34","date_gmt":"2017-06-03T16:33:34","guid":{"rendered":"http:\/\/fusion.bsc.es\/?p=1936"},"modified":"2017-06-07T09:36:02","modified_gmt":"2017-06-07T07:36:02","slug":"first-first-principles-based-simulation-of-a-transition-to-high-confinement-fusion-plasma-on-titan-supercomputer","status":"publish","type":"post","link":"https:\/\/fusion.bsc.es\/index.php\/2017\/06\/03\/first-first-principles-based-simulation-of-a-transition-to-high-confinement-fusion-plasma-on-titan-supercomputer\/","title":{"rendered":"First first-principles-based simulation of a transition to high-confinement fusion plasma on Titan supercomputer"},"content":{"rendered":"<figure id=\"attachment_2011\" aria-describedby=\"caption-attachment-2011\" style=\"width: 740px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-2011\" src=\"http:\/\/fusion.bsc.es\/wp-content\/uploads\/titan2-e1496820786613.jpg\" alt=\"\" width=\"750\" height=\"366\" srcset=\"https:\/\/fusion.bsc.es\/wp-content\/uploads\/titan2-e1496820786613.jpg 2000w, https:\/\/fusion.bsc.es\/wp-content\/uploads\/titan2-e1496820786613-400x195.jpg 400w, https:\/\/fusion.bsc.es\/wp-content\/uploads\/titan2-e1496820786613-1024x499.jpg 1024w\" sizes=\"auto, (max-width: 750px) 100vw, 750px\" \/><figcaption id=\"caption-attachment-2011\" class=\"wp-caption-text\">Simulation was performed on the Titan supercomputer. Source: Oak Ridge Leadership Computing Facility.<\/figcaption><\/figure>\n<p style=\"text-align: justify;\">For the first time, scientists have been able to simulate <strong>the spontaneous transition of turbulence at the edge of a fusion plasma to the high-confinement mode (H-mode)<\/strong> that sustains fusion reactions. The detailed simulation is the first basic physics, or <strong>first-principles-based, modeling<\/strong> with few simplifying assumptions.<!--more--><\/p>\n<p style=\"text-align: justify;\"><em>\u201cAfter 35 years, the fundamental physics of the bifurcation of turbulence into H-mode has now been simulated, thanks to the rapid development of the computational hardware and software capability,\u201d<\/em>\u00a0explained Dr. C.S. Chang, the first author of the <strong>Physical Review Letters<\/strong> paper [118, 175001 (2017)] that reported the findings. The co-authors included a team from <a href=\"http:\/\/www.pppl.gov\/\" target=\"_blank\" rel=\"noopener noreferrer\">PPPL<\/a>, the <a href=\"http:\/\/ucsd.edu\/\">University of California<\/a>, San Diego, and the <a href=\"https:\/\/www.psfc.mit.edu\/\">MIT Plasma Science and Fusion Center<\/a>.<\/p>\n<p style=\"text-align: justify;\">The researchers used <strong>extreme-scale plasma turbulence code <a href=\"http:\/\/epsi.pppl.gov\/computing\/xgc-1\">XGC <\/a><\/strong>to perform the simulation.\u00a0The massively parallel simulation, which revealed the physics behind the transition, ran for three days and took 90 percent of the capacity of <strong><a href=\"https:\/\/www.olcf.ornl.gov\/computing-resources\/titan-cray-xk7\/\">Titan<\/a> <\/strong>at the <a href=\"https:\/\/www.olcf.ornl.gov\/\">Oak Ridge Leadership Computing Facility (OLCF)<\/a>. Titan is the\u00a0most powerful supercomputer for open science in the United States and is capable of performing up to 27 million billion (1015) operations per second.<\/p>\n<p style=\"text-align: justify;\">For more information, see <a href=\"http:\/\/www.pppl.gov\/news\/2017\/05\/scientists-perform-first-basic-physics-simulation-spontaneous-transition-edge-fusion\"><strong>the PPPL\u00a0news<\/strong><\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>For the first time, scientists have been able to simulate the spontaneous transition of turbulence at the edge of a fusion plasma to the high-confinement mode (H-mode) that sustains fusion reactions. The detailed simulation is the first basic physics, or first-principles-based, modeling with few simplifying assumptions.<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1,6],"tags":[],"class_list":["post-1936","post","type-post","status-publish","format-standard","hentry","category-news","category-world"],"_links":{"self":[{"href":"https:\/\/fusion.bsc.es\/index.php\/wp-json\/wp\/v2\/posts\/1936","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fusion.bsc.es\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fusion.bsc.es\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fusion.bsc.es\/index.php\/wp-json\/wp\/v2\/users\/7"}],"replies":[{"embeddable":true,"href":"https:\/\/fusion.bsc.es\/index.php\/wp-json\/wp\/v2\/comments?post=1936"}],"version-history":[{"count":12,"href":"https:\/\/fusion.bsc.es\/index.php\/wp-json\/wp\/v2\/posts\/1936\/revisions"}],"predecessor-version":[{"id":2033,"href":"https:\/\/fusion.bsc.es\/index.php\/wp-json\/wp\/v2\/posts\/1936\/revisions\/2033"}],"wp:attachment":[{"href":"https:\/\/fusion.bsc.es\/index.php\/wp-json\/wp\/v2\/media?parent=1936"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fusion.bsc.es\/index.php\/wp-json\/wp\/v2\/categories?post=1936"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fusion.bsc.es\/index.php\/wp-json\/wp\/v2\/tags?post=1936"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}