Add WarpX example for FEL simulation #5337
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RemiLehe
commented
Sep 27, 2024
RemiLehe
commented
Sep 27, 2024
| lambd = 1.0 / np.fft.fftfreq(Nz, d=info.dz) | ||
| lambda_radiation_lab = lambd[fft_E[:Nz].argmax()] | ||
| lambda_expected = lambda_u / (2 * gamma_boost**2) | ||
| # assert abs(lambda_radiation_lab - lambda_expected) / lambda_expected < 0.01 |
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This will be updated after #5226
RemiLehe
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Oct 11, 2024
BTD diagnostics sometimes show artifacts at the edge of the range of collected data. (See for instance the red curve below.) My understanding is that this happens because the BTD collection planes use data from the guard cells outside of the simulation domain, when interpolating fields that are then used for the Lorentz back-transform. The guard cell data may not be physically correct (e.g. it may not have the right cancellation between `E` and `B`), and could thus cause this artifact. This PR avoids this issue by prevents the collection planes to collect data when it is half a cell from the edge of the simulation domain. See the example below, taken from #5337 (plot of the laser field, from the BTD diagnostic)  The BTD diagnostics values are identical with this PR, except for the problematic point appearing at the edge of the domain.
RemiLehe
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Oct 11, 2024
…ing window velocity (#5341) In the `development` branch, the `BackTransformed` diagnostics assume that the moving window moves exactly at the speed of light. This PR generalizes the code for arbitrary moving window velocity. This PR does not add an automated test, but the upcoming PR #5337 will add a test which features a moving window with a speed different than `c`. This is a follow-up of #5226, which modified the transformation of the simulation box coordinates for arbitrary moving window velocity, but did not yet update the `BackTransformed` diagnostic code.
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RemiLehe
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Oct 11, 2024
EZoni
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Oct 11, 2024
Examples/Physics_applications/free_electron_laser/analysis_fel.py
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RemiLehe
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Oct 11, 2024
Co-authored-by: Edoardo Zoni <[email protected]>
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Oct 11, 2024
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This adds an example for how to run FEL simulations with the boosted-frame technique.
https://warpx--5337.org.readthedocs.build/en/5337/usage/examples/free_electron_laser/README.html