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Progress Update on Mesh Refinement and Stress Wave Simulation Results

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Thanks to Luis and Justin's assistance, I've achieved promising results with refined meshes (~1mm). Using the energy file provided by Luis, I created a collimator jaw with a 3mm mesh. By applying a bunch sequence lasting 1ps and repeating it after 337ns, I simulated stress wave effects over 6ms. Node 3057 consistently recorded the highest temperatures, with a notable rise during the two bunches as compared to one. Preliminary calculations show maximum stress around 1MPa, appearing linear with temperature. A simulation video is available for viewing.

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Progress Update on Mesh Refinement and Stress Wave Simulation Results

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  1. Current Progress • Thanks to help from Luis and Justin, I’m now getting results that seem reasonable. • I’m happy to use more refined meshes (~1mm) and confident the results will be worth the computation time.

  2. Used energy250 file that Luis supplied, and 3mm mesh to create the collimator jaw. • Applied this as one bunch lasting 1ps, then 337ns later applied again as second bunch. Allowed this simulation to run until 6ms to see the effect of stress waves. • A rough calculation showed that 6ms was the approximate time a stress wave would take to reach the surfaces other than the nearest surface.

  3. Temperatures

  4. Node 3057 • Whilst looking for the maximum temperature for each load step it was found that node 3057 was always the hottest. • A graph was produced showing this nodes temperature against time. • Temperature rise for 2 bunches is double temperature rise for 1 bunch. • No time for heat to disperse through conduction. • Maximum temperature still lower than that predicted by Luis (~x-100).

  5. Node 3057 Temperature v. Time

  6. Stress • Maximum stress seem so far is of the order of 1MPa. • Does appear to be linear with temperature. • A stress wave does seem to travel down the taper which looks like a possible area of failure. • A avi file showing the simulation can be found here: http://www.eng-external.rl.ac.uk/ilc/022-2_bunches_long_iso.avi

  7. Von Mises Stress after 6ms

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