it ium , ▁the ▁optimal ▁reaction ▁rates ▁occur ▁at ▁temper atures ▁on ▁the ▁order ▁of ▁ 1 0 0 , 0 0 0 , 0 0 0 ▁K . ▁The ▁pl asma ▁is ▁he ated ▁to ▁a ▁high ▁temperature ▁by ▁o hm ic ▁he ating ▁( running ▁a ▁current ▁through ▁the ▁pl asma ). ▁Add itional ▁he ating ▁is ▁applied ▁using ▁neutral ▁beam ▁injection ▁( which ▁cross ▁magnetic ▁field ▁lines ▁without ▁a ▁net ▁def lection ▁and ▁will ▁not ▁cause ▁a ▁large ▁elect romagnet ic ▁dis ruption ) ▁and ▁radio ▁frequency ▁( R F ) ▁or ▁mic row ave ▁he ating . ▁ ▁At ▁such ▁high ▁temper atures , ▁particles ▁have ▁a ▁large ▁kin etic ▁energy , ▁and ▁hence ▁velocity . ▁If ▁un conf ined , ▁the ▁particles ▁will ▁rapidly ▁escape , ▁taking ▁the ▁energy ▁with ▁them , ▁cool ing ▁the ▁pl asma ▁to ▁the ▁point ▁where ▁net ▁energy ▁is ▁no ▁longer ▁produced . ▁A ▁successful ▁re actor ▁would ▁need ▁to ▁contain ▁the ▁particles ▁in ▁a ▁small ▁enough ▁volume ▁for ▁a ▁long ▁enough ▁time ▁for ▁much ▁of ▁the ▁pl asma ▁to ▁f use . ▁In ▁I TER ▁and ▁many ▁other ▁magnetic ▁conf in ement ▁react ors , ▁the ▁pl asma , ▁a ▁gas ▁of ▁charged ▁particles , ▁is ▁conf ined ▁using ▁magnetic ▁fields . ▁A ▁charged ▁particle ▁moving ▁through ▁a ▁magnetic ▁field ▁experiences ▁a ▁force ▁per pend icular ▁to ▁the ▁direction ▁of ▁travel , ▁resulting ▁in ▁cent rip etal ▁acceleration , ▁thereby ▁conf ining ▁it ▁to ▁move ▁in ▁a ▁circle ▁or ▁hel ix ▁around