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| MOPO-08 |
High Energy Component of X-Ray Spectra in ECR Ion Sources
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77 |
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- J. Y. Benitez, D. Leitner, C. M. Lyneis, J. D. Noland, D. S. Todd
LBNL, Berkeley, California
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The 88-Inch Cyclotron at LBNL is home to three powerful ECR ion sources, which operate at a range of heating frequencies from 6.4GHz for the ECR to a combination of 18GHz and 28GHz for the VENUS superconducting ECR. Over the last few years we have investigated the production of x-rays from ECR ion sources with the goal of improving the understanding of the electron energy distribution within these sources. By measuring the spectral temperatures (defined as the reciprocal of the slope of the semi-logarithmic plot of the x-ray energy spectra) and using them as relative indicators of the electron temperatures, different plasma conditions and tuning parameters can be evaluated. A comparison of the axial x-ray spectra measured with the 6.4 GHz ECR ion source to spectra obtained using the 18 and 28GHz VENUS source at equivalent power densities will be presented. In addition, the paper will discuss the experimental setup and analysis of the x-ray measurements. In particular, we will discuss how to remove artifacts from the energy spectra resulting from the interaction of x-rays with the detector in order to accurately represent the x-rays emitted from the source.
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