Enhancing the Performances of Conventional B-Geometry ECR Ion Sources with Broadband Microwave Radiation
As clearly demonstrated at several laboratories,the performances of electron-cyclotron resonance (ECR)ion sources can be enhanced by increasing the physical sizes(volumes)of embedded ECR zones.Enlarged ECR zones have been achieved by engineering the central magnetic field region of these sources so they are uniformly-distributedvolumesin resonance with single-frequency rf power.Alternatively.the number of ECR surfaces in conventional minimum-B geometry sources can be increased by heating their plasmas with multiple,discrete frequency microwave radiation.Broadband rf power offers a simple,low cost and arguably more effective means for increasing the physical sizes of the ECR zones within the latter source type.In this article,theoretical arguments are made in support of the volume effect and the charge-state enhancing effects of broadband microwave radiation (bandwidth:200MHz) plasma heating are demonstrated by comparing the high-charge-states of Ar ion beams,produced by powering a conventional minimum-B geometry,6.4GHz ECR ion source,equipped with a biased disk,with those produced by conventional bandwidth(bandwidth:～1.5MHz) radiation.
ECR ion source ECR volume-effect ECR zone size broadband ECR plasma heating
G.D.Alton Y.Kawai Y.Liu O.Tarvainen P.Suominen H.Koivisto
国际会议
The 17th International Workshop on ECR Ion Sources and Their Application(第17届国际ECR离子源研讨会)
兰州
英文
128-132
2006-09-17（万方平台首次上网日期，不代表论文的发表时间）