简介:Theq-profilecontrolproblemintheramp-upphaseofplasmadischargesisconsid-eredinthiswork.Themagneticdiffusionpartialdifferentialequation(PDE)modelsthedynamicsofthepoloidalmagneticfluxprofile,whichisusedinthisworktoformulateaPDE-constrainedop-timizationproblemunderaquasi-staticassumption.Theminimumsurfacetheoryandconstrainednumericoptimizationarethenappliedtoachievesuboptimalsolutions.Sincethetransientdy-namicsispre-givenbytheminimumsurfacetheory,thenthismethodcandramaticallyacceleratethesolutionprocess.Inordertoberobustunderexternaluncertaintiesinrealimplementations,PID(proportional-integral-derivative)controllersareusedtoforcetheactuatorstofollowthecomputationalinputtrajectories.Ithasthepotentialtoimplementinreal-timeforlongtimedischargesbycombiningthismethodwiththemagneticequilibriumupdate.
简介:Targetplasmas,onwhichtheformationoftheelectrostaticpotentialsandtheim-provementoftheconfinementarestudied,areproducedwithICRFintheGAMMA10tandemmirror.Theiontemperatureofmorethan10keVhasbeenachievedinrelativelylowdensityplasmas.WhenthestrongICRFheatingisapplied,itisobservedthatthehighfrequencyandthelowfrequencyfluctuationsareexcitedandsuppresstheincreaseoftheplasmaparameters.Recently,anewhighpowergyrotronsystemhasbeenconstructedandtheECRHpowerinplugextendsupto370kW.Theimprovementoftheconfinementduetotheformationofthepotentialintheaxialdirectionandthestrongradialelectricfieldshearhasbeenobserved.
简介:Anewrectangularpulsetriggergeneratorhasbeendevelopedwhichcangeneratetwo10kVpulseswitharisetimelessthan1ns,ajitterof0.2nsandawidthofabout10nsand40ns,respectively.Thisgeneratorusestwopolymer-foilswitchesand25ohmBlumleintransmissionlinescomposedoftwo-parallelstandardcoaxialcablesdischargingintotwo50ohmoutputcables.Thepulsewidthandthedelaybetweentwopulsescanbeadjustedbychangingthelengthofthecables.