Characterization and analysis of infrared imaging diagnostics for intense pulsed ion and electron beams

A two-dimensional calorimetric diagnostic technique with infrared imaging method has been developed. The technique, which enables the measuring of two-dimensional energy density distribution of intense pulsed ion beam (IPIB) and intense pulsed electron beam (IPEB) with particle energy typically of hundreds of keV, is applicable for the diagnostics of IPIB and IPEB for material treatment purpose such as fast quenching, surface melt coating, etc. Testing of the technique has been carried out with IPIB on pulsed ion beam accelerator BIPPAB-450. The maximum ion energy was 450 keV, the density of the ion current was 150 A/cm², and the pulse duration (at half height) was 80 ns. The results showed that the technique can achieve surface energy density sensitivity of 0.1 J/cm² and spatial resolution of 1 mm. Also, the validity and precision of the method was checked by establishing a modeling based on Fourier's Law with Finite Element Method (FEM). The applicability and principles of the technique for IPIB and IPEB was also discussed reasonably.