摘 要: | 1.IlltroductionIthasbeenobservedforyearsthatanincreaseinthedensityinatokamakbeyondacertainlimitproducesamultifacetedasymmetricradiationfromtheedge(MARFE)[l].AMARFEisatoroidallysymmetrictokamakphenomenonoccuringatdonorradiineartheplasmaboundary,definedbyalimiterormagneticseparatrix.Afurtherincreaseindensityusuallyleadsto2disruptivecollapseofthetemperatureprofile,butundercertainconditionsevolvesintoacoolpoloidallysymmetricedgedistributioninwhichvirtuallyalloftheplajsmaheatingpowerisradiateda…
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