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Chinese Physics C> 2007, Vol. 31> Issue(S1) : 80-84 

Recent Results with the 6 GHz Flat-B ECR Ion Source at ORNL-HRIBF

  •  Oak Ridge National Laboratory, Oak Ridge, TN 37831-6368, USA2 AccSys Technology, Pleasanton, CA 94566, USA

  • Experimental studies were conducted to characterize and improve the performance of the flat-B ECR ion source. The emittance of the source was investigated for the first time. The output beam currents of high-charge-states of Ar (q>8) were nearly doubled by increasing the plasma electrode aperture from 4mm to 6mm in diameter. To investigate possible enhancements with broadband microwave radiation, a "white" Gaussian noise generator was employed with a TWT amplifier to generate microwave radiation with a bandwidth of ～200MHz. The performance of the flat-B ECR ion source was found to be much better with narrow bandwidth radiation when the source was operated in the flat-B region. However, the ion beam intensities and charge state distributions were improved with the broadband radiation when the source was tuned {off} the flat-B region.
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    [1] . LIU Y, Alton G D, Reed C A et al. Rev. of Sci. Intrum.,1998, 69: 13112. Alton G D, Smithe D N. Rev. Sci. Instrum., 1994, 65: 7753. LIU Y, Alton G D, Bilheux H et al. Proc. 16th International Conf. on ECR Ion Sources, ed. M. Leitner, AIP, 2005,CP749: 1914. LIU Y, Meyer F M, Cole J M. Proc. 16th International Conf. on ECR Ion Sources, ed. M. Leitner, AIP, 2005,CP749: 1875. Celona L, Gammino S, Ciavola G et al. Proc. 16th International Conf. on ECR Ion Sources, ed. M. Leitner, AIP,2005, CP749: 996. XIE Z Q, Lyneis C M. Rev. Sci. Instrum., 1995, 66: 42187. Alton G D, Meyer F M, LIU Y et al. Rev. Sci. Instrum.,1998, 69: 23058. Vondrasek R et al. 16th Int. Workshop on ECR Ion Sources, Berkeley, California, September, 2004. 319. Vondrasek R, Scott R, Pardo P et al. Proc. 16th International Conf. on ECR Ion Sources, ed. M. Leitner, AIP,2005, CP749: 3110. Alton G D, Kawai Y, LIU Y et al. Proc. 16th International Conf. on ECR Ion Sources, ed. M. Leitner, AIP, 2005,CP749: 10311. Kawai Y, Alton G D, LIU Y. Proc. 2005 Particle Accelerator Conference, 152912. The Model UFX9850 white-noise generator is a product of Noise/Com, Inc. Parsippany, NJ 0705413. Alton G D, Kawai Y, LIU Y et al. HEP NP, 2007,31(Suppl.Ⅰ): 128(in Chinese)(Alton G D, Kawai Y, LIU Y et al. 高能物理与核物理,2007,31(Suppl.Ⅰ):128)14. Hassina N. Bilheux, Ph.D. thesis, Université de Versailles Saint-Quentin-en-Yvelines, France (2003)

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Y.Liu1, Y.Kawai2 and G.D.Alton1. Recent Results with the 6 GHz Flat-B ECR Ion Source at ORNL-HRIBF[J]. Chinese Physics C, 2007, 31(S1): 80-84.
Y.Liu1, Y.Kawai2 and G.D.Alton1. Recent Results with the 6 GHz Flat-B ECR Ion Source at ORNL-HRIBF[J]. Chinese Physics C, 2007, 31(S1): 80-84. shu
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Received: 2007-05-30
Revised: 1900-01-01
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Recent Results with the 6 GHz Flat-B ECR Ion Source at ORNL-HRIBF

  • Oak Ridge National Laboratory, Oak Ridge, TN 37831-6368, USA2 AccSys Technology, Pleasanton, CA 94566, USA
  • Received Date: 2007-05-30
  • Accepted Date: 1900-01-01
  • Available Online: 2007-01-03

Abstract: Experimental studies were conducted to characterize and improve the performance of the flat-B ECR ion source. The emittance of the source was investigated for the first time. The output beam currents of high-charge-states of Ar (q>8) were nearly doubled by increasing the plasma electrode aperture from 4mm to 6mm in diameter. To investigate possible enhancements with broadband microwave radiation, a "white" Gaussian noise generator was employed with a TWT amplifier to generate microwave radiation with a bandwidth of ～200MHz. The performance of the flat-B ECR ion source was found to be much better with narrow bandwidth radiation when the source was operated in the flat-B region. However, the ion beam intensities and charge state distributions were improved with the broadband radiation when the source was tuned {off} the flat-B region.

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