PuSH - Publication Server of Helmholtz Zentrum München

Ravichandran, M.* ; Winter, J.* ; Dimroth, A.* ; Bartzsch, S. ; Kraus, K.M.* ; Zimmermann, M.*

Design and validation strategy for an X-ray target subject to ultra high heat flux loading.

J. Therm. Sci. Eng. Appl. 17:9 (2025)
Publ. Version/Full Text DOI
Open Access Hybrid
Creative Commons Lizenzvertrag
Microbeam X-ray therapy is a promising cancer therapy that uses a high-power electron beam hitting a metallic target. For a clinical microbeam therapy X-ray source, an electron beam of a power of 1 MW onto a focal spot of 0.05 mm x 20 mm size is needed, with a penetration depth of 0.1 mm. This means a heat flux input of 1 TW/m2, an order of magnitude higher than nuclear and medical applications. Numerical simulations based on surface and volumetric heat loading for such an electron beam are presented in this work. The local temperature around the focal spot is modeled in a lower-scale model with an element size of 10 mu m and volumetric heat loading. This differs from the state-of-the-art simulations, in which electron beam loading is modeled as surface heat flux loads. The simulated temperature agrees with the mathematical estimates within an error of 10% while proving feasibility. A novel validation strategy is proposed to address the lack of available test facilities to replicate this extreme heat flux. The critical parameters describing the high-heat-flux- loading are identified as temperature, thermal strain, thermal stress, and strain rate. Scaled-down test specifications are determined to use a test facility of power less than 100 kW. With the verified simulation using the scaled-down test, it is proposed to establish the material's capability to withstand the concentrated1 MW heat load without a 1 MW test facility.
Altmetric
Additional Metrics?
[➜Log in]
Edit extra informations Login
Publication type Article: Journal article
Document type Scientific Article
Keywords biotechnology; heat and mass transfer; micro/nanoscale heat transfer; radiative heat transfer; very high-temperature heat transfer; Radiation-therapy; Thermal-stresses; Tungsten; Surface
ISSN (print) / ISBN 1948-5085
e-ISSN 1948-5093
Journal Journal of Thermal Science and Engineering Applications
Quellenangaben Volume: 17, Issue: 3, Pages: , Article Number: 9 Supplement: ,
Publisher American Society of Mechanical Engineers (ASME)
Publishing Place Two Park Ave, New York, Ny 10016-5990 Usa
Reviewing status Peer reviewed
Institute(s) Institute of Radiation Medicine (IRM)
Grants Technical University of Munich-Institute for Advanced Study
Lander
Free State of Bavaria under the Excellence Strategy of the Federal Government
Federal Ministry of Education and Research (BMBF)