Spectroscopic diagnostics of future fusion reactor plasmas require information on impurity line emissions, especially for relevant high-Z metal elements (e.g., tungsten). These materials will be widely used as plasma facing components for their high heat tolerance and low sputtering yield. Based on an electron beam ion trap, a compact impurity spectra platform is developed to mimic the high-temperature environment of a fusion reactor. The proposed platform can deliver a focused e-beam at energies over 30 keV using a confining magnetic field of ∼1.0 T generated by two superconducting coils (NbTi). Cooled by a closed-loop cryocooler, the coils can avoid the usage of a complicated cryogenic system involving the handling of liquid helium. For spectroscopic studies of highly charged ions, a spherically curved crystal spectrometer is proposed to measure a wavelength range around 2–4 Å covering the typical wavelength range expected to be emitted by metal ions in a fusion plasma. This paper reports the design and development progress of the platform.
A compact electron beam ion trap in support of high-temperature plasma diagnostics based on conduction-cooled superconducting coils
Note: Paper published as part of the Special Topic on Proceedings of the 23rd Topical Conference on High-Temperature Plasma Diagnostics.
B. Bin, B. Lyu, Y. Yang, H. M. Zhang, Q. W. Hao, F. D. Wang, C. Dai, X. W. Du, J. Fu, Y. Y. Li, J. Li, Q. P. Wang; A compact electron beam ion trap in support of high-temperature plasma diagnostics based on conduction-cooled superconducting coils. Rev. Sci. Instrum. 1 June 2021; 92 (6): 063512. https://doi.org/10.1063/5.0040620
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