Discussion and improvement of a blade-type XBPM with coupling suppression by compensating calibration coefficients

Journal Article · 27 November 2019 · Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment

DOI: https://doi.org/10.1016/j.nima.2019.163174 · OSTI ID:1767116

Chuang, J. -Y. ^[1]; Lin, Y. -Z. ^[2]; Hsiao, Y. -M. ^[2]; Liu, Y. -C. ^[2]; Shu, D. ^[3]; Kuan, C. -K. ^[2]; Wu, H. ^[4]; Sheng, I. -C. ^[5]; Cheng, Y. -T. ^[2]; Shueh, C. ^[2]; Chang, C. -C. ^[2]; Chan, C. -K. ^[2]; Yen, J. -Y. ^[6]

---

1. National Synchrotron Radiation Research Center, Hsinchu (Taiwan); National Taiwan Univ., Taipei (Taiwan)
2. National Synchrotron Radiation Research Center, Hsinchu (Taiwan)
3. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
4. Univ. of Maryland, College Park, MD (United States)
5. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
6. National Taiwan Univ., Taipei (Taiwan)

The Taiwan Photon Source (TPS) is a third-generation, 3-GeV storage ring with a design current of 500 mA. To monitor the photon beam stability, blade-type X-ray beam position monitors (XBPMs) are installed to record and monitor the photon beam position. The beam position coordinates involve both the X- and Y-axes, and we must consider coupling effects in the XBPM, which have to be reduced for reliability and optimum precision. This study focuses on the front-end (FE) XBPM calibration via four-blade normalization and suppression matrix compensation. The calibration results show that in the optimal measurement range of +/- 200 mu m, the coupling effect between the X and Y position is suppressed to less than a 1-mu m drift, which satisfies the high-accuracy beam position requirements for user operation. The reliability and precision of the XBPM system improved after applying the serial calibration process developed in this study, and the detailed derivation of each calibration step will be discussed here.

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL (United States)
• Sponsoring Organization: USDOE
• Grant/Contract Number: AC02-06CH11357
• OSTI ID: 1767116
• Journal Information: Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 953; ISSN 0168-9002
• Publisher: ElsevierCopyright Statement
• Country of Publication: United States
• Language: English