IPAC'23 - Student Poster Session Guide

IPAC’23 / STUDENT POSTER SESSION GUIDE 43 Student Poster Session Fully Coherent Soft X-ray Pulse Generation Based on ERL Chao Feng, Zhen Wang (Shanghai Advanced Research Institute), Lu Cao (Shanghai Institute of Ap- plied Physics) , Si Chen, Zhentang Zhao (Shanghai Synchrotron Radiation Facility). Energy recovery linacs (ERLs) possess bright prospect of the fully coherent x-ray generation. Recently, we designed a 600 MeV energy recovery linac capable of producing high power fully coherent radiation pulses at 13.5 nm with a relatively low-intensity 256.5 nm seed laser profit- ed from the employment of angular-dispersion-induced microbunching (ADM) technology. We also designed a matched multiplexed system that can defect each radiator by 8 mrad with a carefully choreographed multi-bend achromat (MBA) scheme. As a result of downstreamMBA’s dispersion compensation, bunching factors will be enhanced both at fundamental wavelength and high harmonics. The bunching factor of the 19th harmonic increased from 10% to 26%, and that of the 57th harmonic became 7.8%, which is sufficient to generate fully coherent radiation in the soft X-ray range. SUPM080 Improve the performance of the SXFEL through Proximal Policy Optimization method Chao Feng (Shanghai Advanced Research Institute), Meng Cai (Shanghai Institute of Applied Phys- ics) , Kaiqing Zhang, zhentang zhao (Shanghai Synchrotron Radiation Facility). Free-electron lasers (FELs) producing ultra-short X-ray pulses with high brightness and continu- ously tunable wavelength have been playing an indispensable role in the field of materials, en- ergy catalysis, biomedicine, and atomic physics. A core challenge is to maintain and improve the transverse overlap of the electron and laser beams. This requires high-dimensional, high-fre- quency, closed-loop control with magnetic elements, further complicated by the diverse re- quirements across a wide range of wavelength configurations. In this work, we introduce a proximal policy optimization architecture for FEL commissioning that autonomously learns to control the full set of magnetic elements. We experimentally demonstrated the feasibility of this technique on the alignment of electron beams and laser beams automatically in Shanghai Soft X-Ray Free Electron Laser User Facility, by adjusting groups of quadrupole magnets and corrector magnets to maximize the FEL output power. This approach offers unprecedented fexibility and generality in problem specification, leading to a notable reduction in effort to optimize multi-dimensional parameters in time-varying systems. SUPM081 Direct RF sampling processor for beam diagnostic Rong Meng (Shanghai Institute of Applied Physics) . Longwei Lai, Yimei Zhou (Shanghai Advanced Research Institute), Jian Chen, Shanshan Cao (Shanghai Synchrotron Radiation Facility). Digital beam signal processor is critical for the beam diagnostic resolution and on-line applica- tion performance. High speed & high precision ADC, high performance FPGA are the key de- vices for the evolution of the processor. At present, ADC technology has entered the era of RF direct sampling, which bandwidth is up to 9GHz, sampling rate is higher than 2GSPS, and sam- pling bits is up to 14 bits. If the beam signal is sampled directly and processed with an FPGA,