Nick SIMOS (BNL)
In an effort to extrapolate the interaction of intense proton pulses with materials to power levels beyond those achieved to-date in accelerators, computational schemes based on finite element formulation are being widely employed. While the long-term interaction between radiating particles and materials result in the degradation of the ability of a material to absorb the induced shock, a concern addressed in parallel studies that is coupled with shock resistance, it is the rapid heating and shock generation in a material that results from short exposure to intense pulses that poses a serious concern and, for the power levels under consideration, is accompanied with serious uncertainties. Experimental studies at power levels generated by currently operating accelerators have been used to benchmark the computational processes which will be used to extrapolate the material response to desired, but yet to be achieved power levels. Different computational schemes that may serve different stages of the interaction problem may be utilized. The choice of such scheme is inherently bound between accuracy and computational cost. This presentation will discuss both the similarities as well as differences between implicit and explicit numerical formulations applicable to the thermo-mechanical shock problem where realistic description of the problem itself requires high-fidelity modeling or descretization and high computational cost regardless of the scheme selected. Experience from the benchmarking of numerical schemes against experimental results will also be presented.
Nick SIMOS (BNL)