Stratified ("quiet") resampling#149
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…ow stratified sampling at poor ratios
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Adds the option for stratified ("quiet") resampling (in addition to the current, fully random downsampling) to
resample(). Includes a new demo notebook contrasting random vs stratified downsampling and their effects on the bunching factor of a beamThis higher noise power from random downsampling can cause collective effects like CSR to be incorrectly represented in simulation, leading to major, macroscopic divergences from high fidelity simulations; stratified downsampling can mitigate this.
Stratified downsampling can cause distortions if the new population is not much smaller than the initial population. By default, if the ratio is not more than 5,
stratified_resample_particles()will fall back to random. The user may override this behavior by settingallow_bad_sampling_ratioto True.Claude made some tests for the new function; not sure how useful they are.