Abstract
Operating the microfocus X-ray source at high power is required to achieve high temporal reso- lution. However, the thermal loading of the anode focal spot is a limiting factor in determining the maximum power of an x-ray tube. In this paper, a transmission window based on polycrystalline diamond, for improved brightness in microfocus X-ray tube was demonstrated. The polycrystalline diamond films which were depos- ited by hot filament chemical vapor deposition (HFCVD) approach revealed good intrinsic thermal properties. We developed a reliable method to fabricate and estimate the windows/target assembly, quantitatively ana- lyzed the anode heat load of the X-ray source operating under the electron beam irradiation, and then tested in a microfocus X-ray tube. It's believed that the experiment and calculation results presented here can be gen- erally applied for the design and the fabrication of a high brightness microfocus X-ray tube employing poly- crystalline diamond windows. KEYWORD: Microfocus X-ray source; Polycrystalline diamond film; Windows/target assembly; HFCVD; Anode heat load.
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