Transmission-type Window of HFCVD Diamond Film for Microfocus X-ray Tube

摘要

Operating the microfocus X-ray source at high power is required to achieve high temporal resolution. 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 deposited 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 analyzed 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 generally applied for the design and the fabrication of a high brightness microfocus X-ray tube employing poly-crystalline diamond windows.