GENERATIONOFINTENSEPULSEDHEAVY ION BEAM BYBIPOLARPULSEACCELERATOR

A newtypeofpulsed ionbeamaccelerator named"bipolar pulse accelerator (BPA)"hasbeenproposed inorder to improve thepurity ofintense pulsed ionbeams. Toconfirm theprinciple oftheBPA,we developed a bipolar pulse generator forthebipolar pulse experiment, whichconsists of aMarxgenerator andapulse forming line (PFL) witharail gapswitch onits end. Wereport thefirst experimental result ofthebipolar pulse andevaluate theelectrical characteristics ofthebipolar pulse generator. Whenthebipolar pulse generator wasoperated at70%0ofthefull charge condition ofthePFL,thesquare bipolar pulse, whichconsists ofthe first pulse withavoltage of-138kVandapulse duration of 72ns(FWHM)andthesecond pulse withavoltage of+130 kVandapulse duration of70ns(FWHM),issuccessfully obtained. Theevaluation oftheelectrical characteristics indicates thatthedeveloped generator canproduce the bipolar pulse withfast rise timeandsharp reversing time. At present thebipolar pulse generator isinstalled intheBytype magnetically insulated iondiodeandwe aredoingthe experiment ontheproduction ofanintense pulsed ionbeam bythebipolar pulse accelerator.