Reconstruction of electron radiation spectra and beam parameters from photon spectrometer data in accelerator experiments using machine learning
arxiv(2022)
摘要
Recovering key aspects of an incoming photon stream during projected FACET-II experiments, such as their energy distributions and the original electron beam's parameters, remains an unsolved computational problem. This paper utilized data from simulated plasma wakefield acceleration betatron radiation experiments and electron-positron pair production to determine which methods could most reliably reconstruct these key properties. The data from these two cases provided a large range of photon energies to help increase confidence in each of the tested methods. In both cases, we compared the performance of maximum likelihood estimation (MLE), a statistical technique used to determine unknown parameters from the distribution of observed data, neural networks, which detect patterns between datasets through repeated training, and a hybrid approach combining the two. Furthermore, in the electron-positron production case, the paper also compared QR decomposition, a matrix decomposition method. The betatron radiation case demonstrated the effectiveness of a hybrid ML-MLE approach, while the electron-positron pair production case illustrated the effectiveness of the ML model in the face of noise. As such, the ML-MLE hybrid approach proved to be the most generalizable of the methods.
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