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SLAC Damage Tests

This study investigates the temperature responses in SLAC damage tests conducted with pulse times of 1 ps and a gap of 0.1 s. Utilizing heat deposition data from Luis, we focused on the region of 0.010 m < z < 0.015 m with a finely meshed volume of 20x20x120 μm. Our findings reveal that peak temperature increases occur primarily within the defined z range, indicating significant reductions in the number of necessary elements for accurate modeling. Initial runs with coarse meshes suggest lower peak temperatures compared to finer meshes, highlighting the importance of mesh size in thermal analysis.

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SLAC Damage Tests

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  1. SLAC Damage Tests • Used pulse time of 1ps, with a gap of 0.1s between pulses. • Used heat deposition file supplied by Luis using the very fine mesh on a small volume. • Studied the .010<z<.015m range. • Used the same mesh, 20x20x120μm. • Coupled Field elements.

  2. 1st example -.015m < z < .015m The peak temperature rise is only seen in the .010m < z < .015m region. 2nd Example .010m < z < .015m What happens on the other region has very little effect on the peak values. This reduces the number of elements needed significantly.

  3. Initial run with coarse mesh Temperature v. Time at Hottest Node Maximum temperature is a lot lower than would be seen with a finer mesh. Temp. rise=17.5°C Temp. loss = 10.8°C Temp. rise=16.6°C Temp. loss = 10.7°C

  4. Comparison – Hottest Node Plotted temperature at hottest node during the first bunch heating, which used the same heating regime. Hottest nodes had the same global location, but different numbering due to meshing. The temperatures were exactly the same, despite the different geometry.

  5. Temp. rise = 233.317°C Smaller time steps are required in this region Temp. rise = 233.02°C Heat loss = 197.482°C

  6. Coarse v. Fine mesh – relative to highest value

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