简介:AnewpelletinjectionsystemwasinstalledontheEASTtokamakandpreliminaryexperimentswereperformedduringthe2012runcampaign.TypicalphenomenaassociatedwithdeuteriumpelletinjectionintoaplasmadischargehavebeenobservedincludingsuddenincreasesoftheelectrondensityandHα/Dαemissionintensityaswellasasignificantdecreaseinplasmaelectrontemperature.ProfileshavebeenstudiedinordertounderstandtheinfluenceofpelletfuellingonEASTdischarges.Eventhoughtheinjectorwasspecificallydesignedforplasmafuelling,ELMtriggeringusingthepelletinjectionhasalsobeentested.InordertofindappropriateparametersfortriggeringELMsinH-modeplasmas,scanningofthepelletinjectionspeedwasemployedforpelletsinjectedfromboththehighfieldsideandlowfieldsideoftheplasmacolumn.Ithasbeenobservedthatlow-speedpelletsinjectedintoH-modeplasmafromthelow-fieldsidecouldtriggeranELMfollowedbyanumberofsmallerinducedELMsatabout300Hz.