Skip to main page content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
. 2025 Jan 1;32(Pt 1):100-108.
doi: 10.1107/S1600577524010208. Epub 2025 Jan 1.

Development and testing of a dual-frequency real-time hardware feedback system for the hard X-ray nanoprobe beamline of the SSRF

Zhisen Jiang  1 , Hui Jiang  1 , Yinghua He  1 , Yan He  1 , Dongxu Liang  1 , Huaina Yu  1 , Aiguo Li  1 , Riccardo Signorato  2
Affiliations

Development and testing of a dual-frequency real-time hardware feedback system for the hard X-ray nanoprobe beamline of the SSRF

Zhisen Jiang et al. J Synchrotron Radiat. .

Abstract

A novel dual-frequency real-time feedback system has been developed to simultaneously optimize and stabilize beam position and energy at the hard X-ray nanoprobe beamline of the Shanghai Synchrotron Radiation Facility. A user-selected cut-off frequency is used to separate the beam position signal obtained from an X-ray beam position monitor into two parts, i.e. high-frequency and low-frequency components. They can be real-time corrected and optimized by two different optical components, one chromatic and the other achromatic, of very different inertial mass, such as Bragg monochromator dispersive elements and a pre-focusing total external reflection mirror. The experimental results shown in this article demonstrate a significant improvement in position and energy stabilities. The long-term beam angular stability clearly improved from 2.21 to 0.92 µrad RMS in the horizontal direction and from 0.72 to 0.10 µrad RMS in the vertical direction.

Keywords: FPGA; PID; X-ray; feedback; frequency domain.

PubMed Disclaimer

Figures

Figure 1
Figure 1
Beamline layout of the hard X-ray nanoprobe beamline at the SSRF.
Figure 2
Figure 2
Bode diagram of the pitch angle of the DMM, DCM and PFM: (a) amplitude and (b) phase plots.
Figure 3
Figure 3
Logic diagram of a typical implementation of the BiBEST system.
Figure 4
Figure 4
(a) Screenshot of the local GUI, which allows the BL operator to monitor, manage and control beam position and intensity. The lower right corner shows the setting of PID parameters in use. (b) The frequency selection and filter setting interface for the four PID channels available. X is horizontal and Y is vertical.
Figure 5
Figure 5
Determination of the linear region of the diamond-based X-ray BPM.
Figure 6
Figure 6
Measured vibration data sampled at 1 kHz over 10 s in the horizontal direction. (a) Comparison of raw data using different cut-off frequencies, and (b) comparison of RMS vibration levels associated with the same cut-off frequencies.
Figure 7
Figure 7
(a) Comparison of measured vibration data in the horizontal direction under different cut-off frequencies and (b) cumulative vibrations in the frequency spectrum.
Figure 8
Figure 8
Short-term beam stability comparison using open loop, dual-frequency closed loop with a cut-off frequency of 5 Hz, and closed loops with single pitch adjustments by either DMM or PFM in the frequency domain working in (a) high-flux fluorescence mode (DMM) and (b) high-energy-resolution mode (DCM).
Figure 9
Figure 9
(a) Spectrum of the fluorescence signal. (b) Normalized fluorescence intensity fluctuation as a function of sampling time using open loop, dual-frequency closed loop with a cut-off frequency of 5 Hz, and closed loops with single pitch adjustments of either DMM or PFM.
See this image and copyright information in PMC

References

    1. Aragão, D., Aishima, J., Cherukuvada, H., Clarken, R., Clift, M., Cowieson, N. P., Ericsson, D. J., Gee, C. L., Macedo, S., Mudie, N., Panjikar, S., Price, J. R., Riboldi-Tunnicliffe, A., Rostan, R., Williamson, R. & Caradoc-Davies, T. T. (2018). J. Synchrotron Rad.25, 885–891. - PMC - PubMed
    1. Bloomer, C., Dent, A., Diaz-Moreno, S., Dolbnya, I., Pedersen, U., Rehm, G., Tang, C. & Thomas, C. (2013). J. Phys. Conf. Ser.425, 042010.
    1. Chayanun, L., Hammarberg, S., Dierks, H., Otnes, G., Björling, A., Borgström, M. T. & Wallentin, J. (2019). Crystals, 9, 432.
    1. Deng, J., Vine, D. J., Chen, S., Nashed, Y. S. G., Jin, Q., Phillips, N. W., Peterka, T., Ross, R., Vogt, S. & Jacobsen, C. J. (2015). Proc. Natl Acad. Sci. USA, 112, 2314–2319. - PMC - PubMed
    1. Engblom, C., Yves, A., Blache, F., Dawiec, A., Corruble, D., Jobert, N., Kubsky, S., Langlois, F., Renaud, G., Stankevic, T., Diop, M., Marchand, P. & Hubert, N. (2017). Proceedings of the 11th International Workshop on Personal Computers and Particle Accelerator Controls (PCaPAC2016), Campinas, Brazil.

LinkOut - more resources