Enhancing the Performances of Conventional B-Geometry ECR Ion Sources with Broadband Microwave Radiation

G.D.Alton<SUP>1</SUP>; Y.Kawai<SUP>2</SUP>; Y.Liu<SUP>1</SUP>; O.Tarvainen<SUP>3</SUP>; P.Suominen<SUP>3</SUP>; H.Koivisto<SUP>3</SUP>

Chinese Physics C> 2007, Vol. 31> Issue(S1) : 128-132

Enhancing the Performances of Conventional B-Geometry ECR Ion Sources with Broadband Microwave Radiation

Oak Ridge National Laboratory, Oak Ridge, TN 37831-6372, USA2 AccSys Technology, 1177 A Quarry Lane, Pleasanton, CA 94566, USA3 Department of Physics, P.O. Box 35, FIN-40014, University of Jyvaskyla JYFL, Finland

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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.

References

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G.D.Alton¹, Y.Kawai², Y.Liu¹, O.Tarvainen³, P.Suominen³ and H.Koivisto³. Enhancing the Performances of Conventional B-Geometry ECR Ion Sources with Broadband Microwave Radiation[J]. Chinese Physics C, 2007, 31(S1): 128-132.

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Received: 2007-05-30
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Enhancing the Performances of Conventional B-Geometry ECR Ion Sources with Broadband Microwave Radiation

Oak Ridge National Laboratory, Oak Ridge, TN 37831-6372, USA2 AccSys Technology, 1177 A Quarry Lane, Pleasanton, CA 94566, USA3 Department of Physics, P.O. Box 35, FIN-40014, University of Jyvaskyla JYFL, Finland

Received Date: 2007-05-30

Accepted Date: 1900-01-01

Available Online: 2007-01-03

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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Enhancing the Performances of Conventional B-Geometry ECR Ion Sources with Broadband Microwave Radiation

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