Improvement in Stability of SPring-8 Standard X-Ray Monochromators with Water-Cooled Crystals

Journal Article · Wed Jun 23 00:00:00 EDT 2010 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3463329· OSTI ID:21410337

Yamazaki, Hiroshi; Shimizu, Nobtaka; Kumasaka, Takashi; Koganezawa, Tomoyuki; Sato, Masugu; Hirosawa, Ichiro; Senba, Yasunori; Ohashi, Haruhiko; Goto, Shunji ^[1]; Shimizu, Yasuhiro; Miura, Takanori; Tanaka, Masayuki; Kishimoto, Hikaru; Matsuzaki, Yasuhisa ^[1]; Kawano, Yoshiaki; Yamamoto, Masaki; Ishikawa, Tetsuya ^[2]

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1. Japan Synchrotron Radiation Research Institute (JASRI), 1-1-1, Kouto, Sayo-cho, Hyogo 679-5198 (Japan)
2. RIKEN SPring-8 Center, 1-1-1, Kouto, Sayo-cho, Hyogo 679-5148 (Japan)

SPring-8 standard double-crystal monochromators containing water-cooled crystals were stabilized to a sufficient level to function as a part of optics components to supply stable microfocused x-ray beams, by determining causes of the instability and then removing them. The instability was caused by two factors--thermal deformation of fine stepper stages in the monochromator, which resulted in reduction in beam intensity with time, and vibrations of coolant supply units and vacuum pumps, which resulted in fluctuation in beam intensity. We remodeled the crystal holders to maintain the stage temperatures constant with water, attached x-ray and electron shields to the stages in order to prevent their warming up, introduced accumulators in the water circuits to absorb pressure pulsation, used polyurethane tubes to stabilize water flow, and placed rubber cushions under scroll vacuum pumps. As a result, the intensity reduction rate of the beam decreased from 26% to 1% per hour and the intensity fluctuation from 13% to 1%. The monochromators were also modified to prevent radiation damage to the crystals, materials used as a water seal, and motor cables.

• OSTI ID: 21410337
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 1234; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
BEAMS
CRYSTALS
DEFORMATION
ELASTOMERS
ELECTROMAGNETIC RADIATION
ELECTRONS
ELEMENTARY PARTICLES
FERMIONS
FLUCTUATIONS
HYDROGEN COMPOUNDS
INSTABILITY
IONIZING RADIATIONS
LEPTONS
MONOCHROMATORS
OPTICS
ORGANIC COMPOUNDS
ORGANIC POLYMERS
OXYGEN COMPOUNDS
PHYSICAL RADIATION EFFECTS
POLYMERS
PULSATIONS
RADIATION EFFECTS
RADIATION SOURCES
RADIATIONS
REACTORS
RUBBERS
SPRING-8 STORAGE RING
STABILITY
STORAGE RINGS
SYNCHROTRON RADIATION SOURCES
TUBES
VARIATIONS
WATER
WATER COOLED REACTORS
X RADIATION