Ib feem ntawm lub tshuab nqus tsev vacuum (cov khoom siv plasma) ntawm cov khoom siv fusion sim thiab yav tom ntej fusion reactor tuaj rau hauv kev sib cuag nrog ntshav. Thaum cov plasma ions nkag mus rau hauv cov khoom, cov khoom no dhau los ua cov atom nruab nrab thiab nyob hauv cov khoom. Yog tias pom los ntawm cov atoms uas tsim cov khoom, cov plasma ions uas nkag mus ua impurity atoms. Cov impurity atoms migrate maj mam nyob rau hauv interspaces ntawm cov atoms uas tsim cov khoom thiab nws thiaj li, lawv diffuse nyob rau hauv cov khoom. Ntawm qhov tod tes, qee qhov impurity atoms rov qab los rau saum npoo thiab rov ua dua rau cov ntshav. Rau qhov ruaj khov ntawm fusion plasma, qhov sib npaug ntawm kev nkag mus ntawm cov plasma ions rau hauv cov khoom thiab rov ua dua ntawm impurity atoms tom qab tsiv teb tsaws los ntawm sab hauv cov khoom yuav yog qhov tseem ceeb heev.

Txoj kev tsiv teb tsaws ntawm impurity atoms hauv cov ntaub ntawv nrog cov qauv siv lead ua zoo tshaj plaws tau raug qhia zoo hauv ntau qhov kev tshawb fawb. Txawm li cas los xij, cov ntaub ntawv tiag tiag muaj cov qauv polycrystalline, thiab tom qab ntawd txoj kev tsiv teb tsaws chaw hauv thaj tsam ntawm thaj tsam lis tseem tsis tau qhia meej. Tsis tas li ntawd, nyob rau hauv cov khoom uas tsis tu ncua kov plasma, cov qauv siv lead ua tawg vim yog kev cuam tshuam ntau dhau ntawm plasma ions. Txoj kev tsiv teb tsaws ntawm impurity atoms hauv cov khoom siv nrog cov qauv siv lead ua tsis zoo tsis tau kuaj xyuas txaus.

Pab pawg tshawb fawb ntawm xibfwb Atsushi Ito, ntawm National Institutes of Natural Sciences NIFS, tau ua tiav hauv kev tsim ib txoj hauv kev rau kev tshawb nrhiav tsis siv neeg thiab ceev ceev txog kev tsiv teb tsaws chaw hauv cov ntaub ntawv uas muaj cov atom geometry los ntawm cov molecular dynamics thiab cov lej sib npaug hauv lub supercomputer. Ua ntej, lawv tshem tawm ntau tus lej me me uas npog tag nrho cov khoom siv.

Hauv txhua qhov me me lawv suav cov kev tsiv teb tsaws chaw ntawm impurity atoms los ntawm molecular dynamics. Cov kev suav ntawm cov npe me me yuav ua tiav hauv lub sijhawm luv luv vim tias qhov loj ntawm lub npe me me thiab cov naj npawb ntawm cov atoms yuav tsum tau kho tsis ntau. Vim tias cov kev suav hauv txhua qhov me me tuaj yeem ua tiav ntawm nws tus kheej, kev suav suav ua ke nrog NIFS supercomputer, Plasma Simulator, thiab HELIOS supercomputer system ntawm Computational Simulation Center ntawm International Fusion Energy Research Center (IFERC-CSC), Aomori, Nyiv. Ntawm Plasma Simulator, vim tias nws tuaj yeem siv 70,000 CPU cores, kev suav ib txhij dhau 70,000 tus thawj tuaj yeem ua tau. Ua ke tag nrho cov txiaj ntsig ntawm kev suav los ntawm cov thawj me me, txoj kev tsiv teb tsaws hla tag nrho cov khoom tau txais.

Xws li txoj kev sib luag ntawm lub khoos phis tawj super txawv ntawm ib qho uas feem ntau siv, thiab hu ua MPMD3)-hom parallelization. Ntawm NIFS, txoj kev simulation uas siv tau MPMD-hom parallelization tau raug npaj. Los ntawm kev sib xyaw ua ke nrog cov tswv yim tsis ntev los no hais txog automatization, lawv tau tuaj txog ntawm txoj kev tshawb nrhiav kev kub ceev rau txoj kev tsiv teb tsaws chaw.

Los ntawm kev siv txoj kev no, nws tuaj yeem tshawb nrhiav tau yooj yim txoj kev tsiv teb tsaws ntawm impurity atoms rau cov ntaub ntawv tiag tiag uas muaj cov kab lis kev cai siv lead ua lossis txawm tias cov ntaub ntawv ntawm cov qauv siv lead ua tsis zoo los ntawm kev sib cuag nrog plasma ntev. Kev tshawb xyuas tus cwj pwm ntawm kev sib sau ua ke ntawm impurity atoms hauv cov khoom siv raws li cov ntaub ntawv hais txog txoj kev tsiv teb tsaws no, peb tuaj yeem ua kom peb cov kev paub tob txog qhov sib npaug hauv cov ntshav thiab cov khoom siv. Yog li kev txhim kho hauv plasma confinement tau cia siab.

Cov txiaj ntsig no tau nthuav tawm thaum lub Tsib Hlis 2016 ntawm 22nd International Conference on Plasma Surface Interaction (PSI 22), thiab yuav muab luam tawm hauv phau ntawv xov xwm Nuclear Materials and Energy.