Data driven generative accelerator model

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With the development of accelerator physics and synchrotron radiation technology, relativistic electron beams accelerated by a linear accelerator (Linac) are capable of amplifying shot noise and radiating an electromagnetic field in the X-ray regime. This system is referred to as the X-ray Free Electron Laser (XFEL) under self-amplifying spontaneous emission (SASE) mode. Serving as the first XFEL facility in the world, the Linac Coherent Light Source (LCLS) has been operating at the SLAC National Accelerator Laboratory (SLAC) since 2009 and benefiting various fields of photon science. Accumulating more than a decade of data, we have collected many experimental records and established systematic coding packages of simulation. Driven by this data, researchers can build surrogate models in order to efficiently and reliably reproduce radiation. In addition, well-trained accelerator models can also support other learning algorithms or guide facility pre-tuning. In this dissertation, we first discuss the SASE XFEL system by solving the radiation field under a one-dimensional approximation. The statistical optic theory helps us to evaluate the distribution and correlation properties of the radiation power profiles. In addition, we introduce learning-based generative algorithms and how they inspired us to use generative adversarial networks (GAN) to build XFEL surrogate models. Next, we show five datasets from various simulated or experimental environments. Lastly, data-driven accelerator models can stably converge and efficiently reproduce training datasets. These models are further investigated by statistical diagnosis and network analysis. In summary, this research implements a XFEL generative model driven by simulated and experimental power profiles data. The algorithmic ideas and surrogate models are promising techniques for data-supporting and facility tuning.


Type of resource text
Form electronic resource; remote; computer; online resource
Extent 1 online resource.
Place California
Place [Stanford, California]
Publisher [Stanford University]
Copyright date 2022; ©2022
Publication date 2022; 2022
Issuance monographic
Language English


Author Ren, Xinyu
Degree supervisor Raubenheimer, Tor O
Thesis advisor Raubenheimer, Tor O
Thesis advisor Edelen, Auralee
Thesis advisor Huang, Zhirong, 1968-
Thesis advisor Tompkins, Lauren Alexandra
Degree committee member Edelen, Auralee
Degree committee member Huang, Zhirong, 1968-
Degree committee member Tompkins, Lauren Alexandra
Associated with Stanford University, Department of Physics


Genre Theses
Genre Text

Bibliographic information

Statement of responsibility Xinyu Ren.
Note Submitted to the Department of Physics.
Thesis Thesis Ph.D. Stanford University 2022.

Access conditions

© 2022 by Xinyu Ren
This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).

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