Dynamic Radiation Effects Induced by Short-Pulsed GeV U-Ion Beams in Graphite and h-BN Targets

Figure 5

(a) Time-dependent velocity signal measured by LDV and (b) corresponding FFT spectra at the rear side (x = y ≈ 0, z = 0.5) of a free 0.5 mm-thick isotropic SGL R6650 graphite disc for the irradiation with 1.14 GeV U-ions at different fluences. Corresponding ANSYS simulations at x = y = 0, z = 0.5: (c) time-dependent velocity and (d) FFT spectra for the impact of a 100 μs U-ion pulse (power density: 3 MW/cm³). Depicted are simulations of a pristine sample and samples with values of Young modulus 2 and 3 times higher than the pristine value as well as thermal conductivity degradation from 95 W/m·K (pristine graphite) to 11 W/m·K and 4 W/m·K, respectively [26], in the heated volume.

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