[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"doc-seo-153990-105":3,"detail-sidebar-cat-0-en-105":81,"doc-detail-153990-en":130},{"code":4,"msg":5,"data":6},0,"ok",{"site_id":7,"language":8,"slug":9,"title":10,"keywords":11,"description":12,"schema_data":13,"social_meta":74,"head_meta":76,"extra_data":78,"updated_unix":80},105,"en","aspects-of-trapped-confined-alpha-physics-on-tftr","Aspects of Trapped Confined Alpha Physics on TFTR","","Energy distributions and radial density profiles of fast confined trapped alpha particles in DT experiments on TFTR are measured from 0.5 to 3.5 MeV using the Pellet Charge Exchange diagnostic. The method applies active neutral particle analysis with the ablation cloud of an injected lithium or boron pellet as the neutralizer. Core spectra match classical slowing down, while Doppler broadening near birth energy indicates the effective temperature of interacting deuterium and tritium ions.",{"@graph":14,"@context":73},[15,34,56],{"@type":16,"itemListElement":17},"BreadcrumbList",[18,23,27,31],{"item":19,"name":20,"@type":21,"position":22},"https://docshare.wps.com","Home","ListItem",1,{"item":24,"name":25,"@type":21,"position":26},"https://docshare.wps.com/document/","Document",2,{"item":28,"name":29,"@type":21,"position":30},"https://docshare.wps.com/document/research-report/","Research & Report",3,{"item":32,"name":10,"@type":21,"position":33},"https://docshare.wps.com/document/aspects-of-trapped-confined-alpha-physics-on-tftr/153990/",4,{"url":32,"name":10,"@type":35,"image":36,"author":41,"headline":10,"publisher":44,"fileFormat":47,"inLanguage":8,"description":12,"dateModified":48,"datePublished":49,"encodingFormat":47,"isAccessibleForFree":50,"interactionStatistic":51},"DigitalDocument",{"url":37,"@type":38,"width":39,"height":40},"https://docshare.wps.com/thumbnails/aspects-of-trapped-confined-alpha-physics-on-tftr/153990.png","ImageObject",300,407,{"name":42,"@type":43},"Paura","Person",{"url":19,"name":45,"@type":46},"DocShare","Organization","application/pdf","2026-09-19","2026-08-28",true,{"@type":52,"interactionType":53,"userInteractionCount":55},"InteractionCounter",{"@type":54},"ViewAction",6,{"@type":57,"mainEntity":58},"FAQPage",[59,65,69],{"name":60,"@type":61,"acceptedAnswer":62},"What energy range is covered for trapped alpha measurements on TFTR?","Question",{"text":63,"@type":64},"Trapped alpha energy distributions are measured in the range 0.5 to 3.5 MeV using the Pellet Charge Exchange diagnostic.","Answer",{"name":66,"@type":61,"acceptedAnswer":67},"How does the PCX diagnostic detect trapped alphas in these experiments?",{"text":68,"@type":64},"It performs active neutral particle analysis using the ablation cloud from an injected lithium or boron pellet as a neutralizer, with a line of sight that selects trapped alphas near a specific pitch-angle condition.",{"name":70,"@type":61,"acceptedAnswer":71},"What mechanisms shape alpha spectra and density profiles outside the core?",{"text":72,"@type":64},"Outside the core, alpha spectra and density profiles are influenced by magnetic field ripple and are consistent with stochastic ripple diffusion, while sawtooth oscillations broaden alpha density profiles.","https://schema.org",{"og:url":32,"og:type":75,"og:title":10,"og:site_name":45,"og:description":12},"article",{"robots":77,"canonical":32},"index,follow",{"doc_id":79,"site_id":7},153990,1787884702,{"code":4,"msg":82,"data":83},"success",[84,88,92,96,101,105,110,114,119,122,126],{"id":22,"doc_module":4,"doc_module_name":25,"category_name":85,"show_sort_weight":86,"slug":87},"Story & Novel",90,"story-novel",{"id":26,"doc_module":4,"doc_module_name":25,"category_name":89,"show_sort_weight":90,"slug":91},"Literature",80,"literature",{"id":33,"doc_module":4,"doc_module_name":25,"category_name":93,"show_sort_weight":94,"slug":95},"Exam",70,"exam",{"id":97,"doc_module":4,"doc_module_name":25,"category_name":98,"show_sort_weight":99,"slug":100},5,"Comic",60,"comic",{"id":55,"doc_module":4,"doc_module_name":25,"category_name":102,"show_sort_weight":103,"slug":104},"Technology",50,"technology",{"id":106,"doc_module":4,"doc_module_name":25,"category_name":107,"show_sort_weight":108,"slug":109},7,"Healthcare",40,"healthcare",{"id":111,"doc_module":4,"doc_module_name":25,"category_name":29,"show_sort_weight":112,"slug":113},8,30,"research-report",{"id":115,"doc_module":4,"doc_module_name":25,"category_name":116,"show_sort_weight":117,"slug":118},9,"Religion & Spirituality",20,"religion-spirituality",{"id":117,"doc_module":4,"doc_module_name":25,"category_name":120,"show_sort_weight":117,"slug":121},"World Cup","world-cup",{"id":123,"doc_module":4,"doc_module_name":25,"category_name":124,"show_sort_weight":123,"slug":125},10,"Lifestyle","lifestyle",{"id":127,"doc_module":4,"doc_module_name":25,"category_name":128,"show_sort_weight":97,"slug":129},19,"General","general",{"code":4,"msg":82,"data":131},{"doc_id":79,"user_id":132,"nickname":42,"user_avatar":133,"doc_module":4,"category_id":111,"category_name":29,"doc_title":10,"doc_description":12,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":55,"is_deleted":4,"is_public":22,"is_downloadable":22,"audit_status":22,"page_count":106,"language":139,"language_code":8,"site_id":7,"html_lang":8,"table_of_contents":140,"faqs":141,"seo_title":142,"seo_description":12,"update_tm":80,"read_time":143},13056712833777,"https://ap-avatar.wpscdn.com/davatar_29158cc5080c5b710cf443261637dec0","GA–A22323  \nASPECTS OF  \nTRAPPED CONFINED ALPHA PHYSICS  \nON TFTR  \nby  \nM.P. PETROV, N.N. GORELENKOV, R.V. BUDNY,  \nH.H. DUONG, R.K. FISHER, J.M. McCHESNEY,  \nD.K. MANSFIELD, S.S. MEDLEY, and P.B. PARKS  \nJUNE 1996  \nGA–A22323  \nASPECTS OF  \nTRAPPED CONFINED ALPHA PHYSICS  \nON TFTR  \nby  \nM.P. PETROV, 1 N.N. GORELENKOV,2 R.V. BUDNY,3  \nH.H. DUONG,4 R.K. FISHER, J.M. McCHESNEY,  \nD.K. MANSFIELD,3 S.S. MEDLEY, 3 and P.B. PARKS  \nThis is a preprint of a paper to be presented at the 23rd  \nEuropean Physical Society Conference on Controlled Fusion  \nand Plasma Physics, June 24–28, 1996, Kiev, Ukraine, and tobe printed in the Proceedings  \nWork supported by  \nthe U.S. Department of Energy  \nunder Grant DE-FG03-92ER54150  \nand Contract DE-AC02-CH03073  \n1A.F. Ioffe Physical-Technical Institute  \n2 TRINITI  \n3 Princeton Plasma Physics Laboratory  \n4 Gemeral Atomics ORAU Fellow  \nGENERAL ATOMICS PROJECT 3937 JUNE 1996  \nPetrov et al.: Aspects of Trapped Confined Alpha Physics on TFTR  \nAspects of Trapped Confined Alpha Physics  \non TFTR  \nM.P. Petrov  \nA.F. Ioffe Physical-Technical Institute, St. Petersburg, 19402, Russia  \nN.N. Gorelenkov  \nTRINITI, Troitsk 142092, Russia  \nR.V. Budny, D.K. Mansfield, S.S. Medley  \nPrinceton Plasma Physics Laboratory, Princeton, New Jersey 08543, U.S.A.  \nH.H. Duong, R.K. Fisher, J.M. McChesney, P.B. Parks General Atomics, San Diego, California 92186, U.S.A.  \nAbstract  \nThe energy distributions and radial density profiles of the fast-confined trapped alpha particles in DT experiments on TFTR are being measured in the energy range 0.5 to 3.5 MeV using the Pellet Charge Exchange diagnostic developed in a collaboration involving General Atomics, the A.F. Ioffe Physical-Technical Institute, and the Princeton Plasma Physics Laboratory. A brief description of the measurement technique which involves active neutral particle analysis using the ablation cloud surrounding an injected lithium or boron pellet as the neutralizer is presented. In the core of quiescent TFTRdischarges, measured alpha spectra are consistent with classical slowing down. Measured Doppler broadening of alphas near the birth energy is consistent with the effective temperature of interacting deuterium and tritium ions. Outside the core alpha energy spectra and density profiles are influenced by the magnetic field ripple and appear to be consistent with stochastic ripple diffusion. Sawtooth oscillations lead to the significant broadening of alpha density profiles. The experimental data are modeled using a FokkerPlanck Post TRANSP (FTTP) code which includes the effects of the classical slowing down, magnetic field ripple losses, and the sawtooth mixing of alpha particles. The comparison of the experimental data with the FPPT calculations shows that broadening of trapped alpha density profiles after the sawtooth crashes can be explained by the influence of poloidal electric field generated during the crashes.  \nGeneral Atomics Report GA–A22323 iii  \nPetrov et al.: Aspects of Trapped Confined Alpha Physics on TFTR  \n1. Introduction  \nThe energy distributions and radial density profiles of the fast confined trapped alpha particles in DT experiments on TFTR are being measured in the energy range 0.5 to3.5 MeV using the Pellet Charge Exchange (PCX) diagnostic. This technique uses the active neutral particle analysis with the ablation cloud of an injected lithium or boron pellet as the neutralizer [1] . Initial measurements of the fast confined alpha energy distributions and alpha density radial profiles in the presence of stochastic ripple diffusion and sawtooth oscillations were reported previously [2,3] . This paper focuses on more detailed analysis of some aspects of fast confined alpha physics on the basis of modeling of PCX experimental results with and without the presence of stochastic ripple diffusion and sawtooth mixing.  \n2. PCX Technique and Data Analysis  \nThe PCX diagnostic on TFTR uses lithium and boron pellets injected along amid","cbCaigNS1PizxRgG","https://ap.wps.com/l/cbCaigNS1PizxRgG","pdf",73285,"English","# Abstract\n# Introduction\n# PCX Technique and Data Analysis\n# Alpha Slowing Down in the Core of Quiescent Discharges","[{\"question\":\"What energy range is covered for trapped alpha measurements on TFTR?\",\"answer\":\"Trapped alpha energy distributions are measured in the range 0.5 to 3.5 MeV using the Pellet Charge Exchange diagnostic.\"},{\"question\":\"How does the PCX diagnostic detect trapped alphas in these experiments?\",\"answer\":\"It performs active neutral particle analysis using the ablation cloud from an injected lithium or boron pellet as a neutralizer, with a line of sight that selects trapped alphas near a specific pitch-angle condition.\"},{\"question\":\"What mechanisms shape alpha spectra and density profiles outside the core?\",\"answer\":\"Outside the core, alpha spectra and density profiles are influenced by magnetic field ripple and are consistent with stochastic ripple diffusion, while sawtooth oscillations broaden alpha density profiles.\"}]","Aspects of Trapped Confined Alpha Physics on TFTR | PDF",18]