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@inproceedings{li:ipac2021-mopab390,
author = {D.B. Li and H.Y. Lin and Q.Y. Wang and P. Zhang},
title = {{Development of a 166.6 MHz Low-Level RF System by Direct Sampling for High Energy Photon Source}},
booktitle = {Proc. IPAC'21},
pages = {1189--1191},
eid = {MOPAB390},
language = {english},
keywords = {cavity, LLRF, controls, photon, pick-up},
venue = {Campinas, SP, Brazil},
series = {International Particle Accelerator Conference},
number = {12},
publisher = {JACoW Publishing, Geneva, Switzerland},
month = {08},
year = {2021},
issn = {2673-5490},
isbn = {978-3-95450-214-1},
doi = {10.18429/JACoW-IPAC2021-MOPAB390},
url = {https://jacow.org/ipac2021/papers/mopab390.pdf},
note = {https://doi.org/10.18429/JACoW-IPAC2021-MOPAB390},
abstract = {{A digital low-level radio frequency (LLRF) system by direct sampling has been proposed for 166.6 MHz superconducting cavities at High Energy Photon Source (HEPS). The RF field inside the cavities has to be controlled better than ±0.1% (peak to peak) in amplitude and ±0.1 deg (peak to peak) in phase. Considering that the RF frequency is 166.6 MHz, which is well within the analog bandwidth of modern high-speed ADCs and DACs, direct RF sampling and direct digital modulation can be achieved. A digital LLRF system utilizing direct sampling has therefore been developed with embedded experimental physics and industrial control system (EPICS) in the field programmable gate array (FPGA). The performance in the lab has been characterized in a self-closed loop with a residual peak-to-peak noise of ±0.05% in amplitude and ±0.03 deg in phase, which is well below the HEPS specifications. Further tests on a warm 166.6 MHz cavity in the lab are also presented.}},
}