Fiber-Optic Taper Coupled with a Large Format Charge-coupled Device X-ray Detector: Fast Readout and High Duty-Cycle Ratio

Journal Article · Fri Jan 19 04:00:00 EST 2007 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.2436270· OSTI ID:21049228

Ito, Kazuki; Fujisawa, Tetsuro; Iwata, Tadahisa ^[1]

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1. RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo, Sayo, Hyogo 679-5148 (Japan)

A novel fiber-optic taper (FOT) coupled with a charge-coupled device (CCD) X-ray detector was developed as a basic module of the simultaneous small- and wide-angle X-ray scattering measurement apparatus at SPring-8 BL45XU. The detector consists of two identical units, each comprising a phosphor (CsI:Tl, 80 {mu}m thickness), a 2:1 demagnifying FOT, and an interline transfer-type CCD as an image sensor. The CCD has a 4000 x 2624 pixel format with a 9 {mu}m pitch, resulting in an effective pixel size of 18 {mu}m at the large end of the FOT. The active area size is 72.0 mm x 47.2 mm in each unit. The image stored in the CCD can be readout through the dual readout channels with 12 bits ADC within 220 ms without binning and 65 ms with 8 x 8 binning, respectively. Moreover, this detector is not necessary to stop the incoming X-rays during the CCD readout and can simultaneously execute both exposure and readout on the CCD with a small dead time of {approx}1 {mu}s so that a duty-cycle ratio of almost 100% is achieved. Therefore, it allows the continuous rotation method, where data is collected without stopping the rotation of a sample crystal in macromolecular crystallography. The continuous rotation method was performed with a total data collection time of 12 s for a range of 180 deg. with 1.5 deg. per frame (120 frames). In this paper, the design, performance characteristics, and verification experiment of the detector will be described.

• OSTI ID: 21049228
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 879; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
ANALOG-TO-DIGITAL CONVERTERS
CHARGE-COUPLED DEVICES
CRYSTALS
DEAD TIME
DESIGN
IMAGES
OPTICAL FIBERS
PERFORMANCE
READOUT SYSTEMS
SENSORS
SPRING-8 STORAGE RING
X RADIATION
X-RAY DETECTION
X-RAY DIFFRACTION