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1、>6-vT^^iSympo3iuaonE"gineeriagProblemsofFusionResearch,Chicago,IL,BNL30330NEGATIVEIONBEAMFORMATION,TRANSPORTANDACCELERATION*BNL—30330••J.O.AlessiCDE82004702arookhavenNationalLaboratoryAssociatedUniversities,lac.Upeon,NewYork11973MASTERAbstractanodetransparencylow,chusminimizingchegasflowou
2、cofchesource.In3SLsources,che*-densicyactheBNLNeucral3eamDevelopmentCroupiswork-thecachodeis>100rnA/cnr,whilethedensicyintheingonchedevelopmentofnegaciveionbaaedneucralextractionalicsis0.5-2.0Aicsr.bsataayscens,usinghighcurrentdensitysurface3-jstaasourcesofchemagnetronandhallowcachodeFigur
3、e1showsaO—beamemittancezeasuredfromaischarge(HCO)cype."Jichchemagnetronsource,theapulsedmagnetronsource(wichacathodegroove),^Ianiscocransoorca2AD—beamthroughabendingalongwichtheextractiongeometryused.Thebeam-a»;necbeforeaccelerationco200keV.Inexpari-anglesperpendiculartotheemissionslicaret
4、ypi-njnc3wichapulsedmagnetron,0.4Aofft—wastrans-cally±250orad(for353ofthebeam).ParallelcoTOC;=>1througha90°,n=1,bendingmagnetwith303chesiicstheanglesarenormallyS75arad.The:r^.nsaission.ViiclicheLoweroperacingpressureinemictanceofche.beamfromamagnecronwichouc:.-.-•HCOsource,closecoupledacce
5、lerationwillbegroovesinchecachodealsoshowedsimilarangles.a-jsUed.TheMEQALAC,XFQ,andadcacceleratingThRlargeanglesperpendiculartocheslicsmaybei::.ssewichperiodicquadrupolefocusingarecon-dueinparecochefactchactheextractedbeamhasitieredforreachinghigherenergies.Apreliminarytwoenergycomponents,
6、-onebeing"fasc"ionswichan-t.'.p^r-..-3ancwasperformedwithquadrupole,beamtrans-energyequaltothecachodevoltage(1SQ-200V),and>J::anda3.3TAbeuta-astransportedthroughacheotherbeingalowenergycosponenccomingfrom=cr;ijoftwelvequadrupoles,wich3mmape-CurssandchechargeexchangebecweenchefascS—ionsandi
7、:0C.2Ilengthof7.2cm.hydrogenatomsinthedischargegap.Theopticsforchetwoenergycomponentscannotbeoptimizedsimul-caneously.Hichacwogapexcraccor,chebeamanglesperpendicularcocheslitswerereducedaignificanc--r.trjauctianly,butnocwithoutalargedecreaseinbeaminten-Adcheen
