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@inproceedings{lee:ipac2021-wepab363,
author = {Y. Lee},
title = {{Dynamic Response of Spallation Volume to Beam Raster on the European Spallation Source Target}},
booktitle = {Proc. IPAC'21},
pages = {3552--3554},
eid = {WEPAB363},
language = {english},
keywords = {target, resonance, operation, simulation, proton},
venue = {Campinas, SP, Brazil},
series = {International Particle Accelerator Conference},
number = {12},
publisher = {JACoW Publishing, Geneva, Switzerland},
month = {08},
year = {2021},
issn = {2673-5490},
isbn = {978-3-95450-214-1},
doi = {10.18429/JACoW-IPAC2021-WEPAB363},
url = {https://jacow.org/ipac2021/papers/wepab363.pdf},
note = {https://doi.org/10.18429/JACoW-IPAC2021-WEPAB363},
abstract = {{To achieve a desirably low beam intensity on the target, the European Spallation Source (ESS) adopted a beam raster system at the high beta beam transport part of the linac. The raster system paints the beam on the target with frequencies up to 40 kHz within the 2.86 ms beam pulse, to form a uniformly expanded beam footprint. While the beam raster reduces the time-averaged beam current density to a level that the 5 years of design lifetime of the target system can be achieved with a high operational reliability, it could potentially induce deleterious dynamic excitations in the spallation volume made of tungsten. The stress wavelets created by raster sweeps can be amplified if the sweep frequency is in tune with a resonance mode of the tungsten volume. This coherent interference of the wavelets could lead to a high dynamic stress in tungsten, posing a risk of premature failure of the target. In this paper, the dynamic response of the spallation volume of the ESS target to different beam raster frequencies has been analysed, using multi-physics simulations based on measured material data. Finally, a safe operational range of the beam raster frequency band is proposed.}},
}