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11/15/2022 | Intelligent Embedded Systems

New journal article in Physical Accelerators and Beams

The paper Optimizing a superconducting radio-frequency gun using deep reinforcement learning was accepted for the APS Journal Physical Review Accelerators and Beams. It was developed in joint work with colleagues from the Helmholtz-Zentrum Berlin für Materialien und Energie. The abstract of the paper is as follows:

Superconducting photoelectron injectors are promising for generating highly brilliant pulsed electron beams with high repetition rates and low emittances. Experiments such as ultrafast electron diffraction, experiments at the Terahertz scale, and energy recovery linac applications require such properties. However, optimizing the beam properties is challenging due to the high number of possible machine parameter combinations. This article shows the successful automated optimization of beam properties utilizing an already existing simulation model. To reduce the required computation time, we replace the costly simulation with a faster approximation with a neural network. For optimization, we propose a reinforcement learning approach leveraging the simple computation of the derivative of the approximation. We prove that our approach outperforms standard optimization methods for the required function evaluations given a defined minimum accuracy.

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