Improvement in stability of SPring-8 X-ray monochromators with cryogenic-cooled silicon crystals

Hiroshi Yamazaki, Haruhiko Ohashi, Yasunori Senba, Tomoyuki Takeuchi, Yasuhiro Shimizu, Masayuki Tanaka, Yasuhisa Matsuzaki, Hikaru Kishimoto, Takanori Miura, Yasuko Terada, Motohiro Suzuki, Hiroo Tajiri, Shunji Goto, Masaki Yamamoto, Masaki Takata, Tetsuya Ishikawa

Research output: Contribution to journalConference article

14 Citations (Scopus)

Abstract

SPring-8 standard double-crystal monochromators cooled with liquid nitrogen are being improved for providing a stable supply of intense nanometer-focused X-ray beams. The instability originates from the vibration and thermal deformations of the various stages of the monochromators: the former is caused by turbulent flow of the liquid nitrogen, and the latter is mainly due to unwanted cooling from the liquid nitrogen. A low-vibration flexible tube was devised to stabilize the coolant flow by covering the corrugations of the flexible tube with an alumina fiber textile. To achieve thermal insulation, we inserted a machinable ceramic block and a copper plate between the cooled crystal holder and the stages; the temperature of the copper plate was controlled to within ±0.01 °C using a sheet heater and a proportional-integral-derivative current controller. As a result, the vibration was reduced from 1 to 0.15 in terms of the misalignment angle between the two crystals, and a vertical focus size of 230 nm was achieved by demagnification projection of the real light source onto the focal plane. The angular instability due to the thermal deformation was suppressed to a rate of less than 0.2/h. Furthermore, we discuss ongoing improvements for further stabilization.

Original languageEnglish
Article number052001
JournalJournal of Physics: Conference Series
Volume425
Issue numberPART 5
DOIs
Publication statusPublished - 2013 Jan 1
Externally publishedYes
Event11th International Conference on Synchrotron Radiation Instrumentation, SRI 2012 - Lyon, France
Duration: 2012 Jul 92012 Jul 13

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Yamazaki, H., Ohashi, H., Senba, Y., Takeuchi, T., Shimizu, Y., Tanaka, M., Matsuzaki, Y., Kishimoto, H., Miura, T., Terada, Y., Suzuki, M., Tajiri, H., Goto, S., Yamamoto, M., Takata, M., & Ishikawa, T. (2013). Improvement in stability of SPring-8 X-ray monochromators with cryogenic-cooled silicon crystals. Journal of Physics: Conference Series, 425(PART 5), [052001]. https://doi.org/10.1088/1742-6596/425/5/052001