IBIC2020 - List of Authors (Takahashi, S.)

Paper	Title	Page
TUPP06	Inclined X-ray Beam Position Monitors to Reduce Influence of Filling Pattern for the SPring-8 Photon Beamlines	37
	H. Aoyagi, Y. Furukawa, S. Takahashi JASRI/SPring-8, Hyogo, Japan
	Funding: This work is partly supported by Japan Society for the Promotion of Science through a Grant-in-Aid for Scientific Research (c), No.18K11943. The X-ray beam position monitors (XBPMs) equipped with blade-type detector heads in SPring-8, which operate in photoemission mode, are required to withstand severe high heat loads. In addition, they must work in a variety of several-bunch mode operations. However, as bunch current in the storage ring increased, influence of bunch filling patterns on XBPM performance increased year by year. We have performed a systematic evaluation of the influence of the filling patterns. We found that the cause of the influence is suppression of the XBPM current signal due to the space charge effect, and that it can be quantified by observing the behavior of the current signal while changing the voltage of a photoelectron collection electrode. We have designed and manufactured new blade-type detector heads in inclined configuration for the purpose of mitigation the space charge effect. It has been demonstrated that the influence of filling patterns is reduced to a few um. We also report that, as a result of a series of efforts against existing XBPMs for all ID beamlines, the influence has been reduced to about 5 um RMS. IPAC2019 WEPGW027, https://ipac2019.vrws.de/papers/wepgw027.pdf ** PASJ2019 THPI029, https://www.pasj.jp/web_publish/pasj2019/proceedings/PDF/THPI/THPI029.pdf
	Poster TUPP06 [4.905 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2020-TUPP06
About •	paper received ※ 09 September 2020 paper accepted ※ 15 September 2020 issue date ※ 30 October 2020
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

Inclined X-ray Beam Position Monitors to Reduce Influence of Filling Pattern for the SPring-8 Photon Beamlines

37

H. Aoyagi, Y. Furukawa, S. Takahashi
JASRI/SPring-8, Hyogo, Japan

Funding: This work is partly supported by Japan Society for the Promotion of Science through a Grant-in-Aid for Scientific Research (c), No.18K11943.
The X-ray beam position monitors (XBPMs) equipped with blade-type detector heads in SPring-8, which operate in photoemission mode, are required to withstand severe high heat loads. In addition, they must work in a variety of several-bunch mode operations. However, as bunch current in the storage ring increased, influence of bunch filling patterns on XBPM performance increased year by year. We have performed a systematic evaluation of the influence of the filling patterns. We found that the cause of the influence is suppression of the XBPM current signal due to the space charge effect, and that it can be quantified by observing the behavior of the current signal while changing the voltage of a photoelectron collection electrode*. We have designed and manufactured new blade-type detector heads in inclined configuration for the purpose of mitigation the space charge effect**. It has been demonstrated that the influence of filling patterns is reduced to a few um. We also report that, as a result of a series of efforts against existing XBPMs for all ID beamlines, the influence has been reduced to about 5 um RMS.
* IPAC2019 WEPGW027, https://ipac2019.vrws.de/papers/wepgw027.pdf
** PASJ2019 THPI029, https://www.pasj.jp/web_publish/pasj2019/proceedings/PDF/THPI/THPI029.pdf

Poster TUPP06 [4.905 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2020-TUPP06

About •

paper received ※ 09 September 2020 paper accepted ※ 15 September 2020 issue date ※ 30 October 2020

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)