| 宽带微波馈入对于具有常规磁场构型的ECR离子源性能的提高 |
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| 引用本文： | G.D.Alton,Y.Kawai,Y.Liu,O.Tarvainen,P.Suominen,H.Koivisto. 宽带微波馈入对于具有常规磁场构型的ECR离子源性能的提高[J]. 中国物理 C, 2007, 31(Z1): 128-132 |
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| 作者姓名： | G.D.Alton Y.Kawai Y.Liu O.Tarvainen P.Suominen H.Koivisto |
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| 作者单位： | 1 Oak Ridge National Laboratory, Oak Ridge, TN 37831-6372, USA;2 AccSys Technology, 1177 A Quarry Lane, Pleasanton, CA 94566, USA;3 Department of Physics, P.O. Box 35, FIN-40014, University of Jyvaskyla JYFL, Finland |
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| 基金项目： | Supported by the U.S.Department of Energy under contract DE-AC05-00OR22725 with UT-Battelle,LLC |
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| 摘 要： | 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.En- larged ECR zones have been achieved by engineering the central magnetic field region of these sources so they are uniformly-distributed"volumes"in 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 ef- fects 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.
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| 收稿时间： | 2007-05-30 |
| 修稿时间： | 2007-04-20 |
Enhancing the Performances of Conventional B-Geometry ECR Ion Sources with Broadband Microwave Radiation |
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| G.D.Alton,Y.Kawai,Y.Liu,O.Tarvainen,P.Suominen,H.Koivisto. Enhancing the Performances of Conventional B-Geometry ECR Ion Sources with Broadband Microwave Radiation[J]. High Energy Physics and Nuclear Physics, 2007, 31(Z1): 128-132 |
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| Authors: | G.D.Alton Y.Kawai Y.Liu O.Tarvainen P.Suominen H.Koivisto |
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| Abstract: | 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-distributed"volumes"in 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. |
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| Keywords: | ECR ion source ECR volume-effect ECR zone size broadband ECR plasma heating |
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