Rayonix HS (High Speed) CCD Detector Series
MX340-HS: 16 chip high speed mosaic CCD detector with 340 mm x 340 mm active area and 2.9:1 taper ratio
MX225-HS: 4 chip high speed mosaic CCD detector with 225 mm x 225 mm active area and 2.9:1 taper ratio
SX85-HS: single chip high speed CCD detector with 85 mm x 85 mm active area and 2.9:1 taper ratio
LX170-HS: 2 chip high speed mosaic CCD detector with 85 x mm x 170 mm active area and 2.9:1 taper ratio for SAXS/WAXS
LX255-HS: 3 chip high speed mosaic CCD detector with 85 x mm x 255 mm active area and 2.9:1 taper ratio for SAXS/WAXS
MarXperts is proud to be distributor (outside the Americas) of the world’s most advanced large area CCD-based X-ray detectors manufactured by Rayonix, LLC, USA.
The HS series is the latest addition to the line of CCD-detectors. It implements leading frame transfer technology that makes the new detectors as fast as pixel detectors (up to 140 frames/second) without compromising data quality and resolution. Thus, the HS detectors are ideally suited for experimental conditions where the read-out time of a detector becomes the bottleneck and not the amount of available X-ray photons, i.e. mostly on high brilliance synchrotron sites. Typical usage include high throughput single crystal crystallography including time-resolved studies, small- and wide angle scattering experiments (SAXS/WAXS), powder diffraction, X-ray computed tomography. Without the count-rate limitations of the competing pixel detectors, they are equally well suited for the upcoming X-ray electron laser beamlines (XFEL).
The detectors are available as single chip detectors (SX-30, SX-85) or as mosaic arrangements with 2x2, 3x3, 4x4 or 5x5 arrays with varying fibre optic taper sizes. In order to allow SAXS to pass through while measuring WAXS, scientists have been asking for an X-ray detector with a hole in the middle. The resulting LX series has a long, rectangular detecting surface, engineered with a notch to allow the direct beam and SAXS data to pass through.
Despite of their modular setup, the mosaic detectors come without gaps between the individual modules which is a considerable advantage over competing pixel detectors. The models differ most distinctively in the amount of built-in CCD-chips and the corresponding active area. The following table gives an overview of specifications common to the entire series and point out the few relevant differences.
EXCLUSIVE SENSOR WITH HIGH SPEED FRAME-TRANSFER TECHNOLOGY:
All HS-series detectors are based on a custom design CCD-sensor sized 3 x 3 cm with 1920 x 1920 pixels. A fiber optic taper is permanently bound to the sensor using a patented technology. The fiber optic tapers use demagnification ratios of 1:1, 1:2.6 or 2.92 yielding detectors with very large surfaces, depending on the amount of sensor modules.
LOW NOISE, ULTRA-FAST READOUT:
Custom electronics provide ultra-low readout noise at high readout speeds: either 8e- in high speed mode or 4e- in low noise mode. The read-out time of a full frame is approx. 400 msec. With a typical binning mode of 2x2, the read-out time drops to 100 msec (10 frames/sec). With a 10 x 10 binning, a single frame is produced in 7 ms (140 frames/sec). The dead-time between images is 1 msec.
LOW TEMPERATURE, LOW DARK CURRENT:
The CCD sensor is cooled to -80°C and protected inside a sealed vacuum chamber. The resulting dark current, less than 0.003e-/pixel/sec., allows exposures long enough for data collection from any crystal on any X-ray source. The refrigeration system requires only a standard electrical outlet and no cooling water.
The detectors are calibrated carefully before delivery. Due to the permanent bond between the fiber-optic taper and the CCD chip, the instrument does not require routine recalibration.
|X-ray sensitive surface [mm x mm]||30 x 30||85 x 85||170 x 170||225 x 225||300 x 300||340 x 340||425 x 425|
|Number of CCD-chips||1||1||4||9||16||16||25|
|Fiber-optic taper demagnification ratio||1 : 1||2.92 : 1||2.92 : 1||2.60 : 1||2.60 : 1||2.92 : 1||2.92 : 1|
|Pixel in full image||19202||19202||38402||57602||76802||76802||96002|
|Pixel size in full image [μm]||16||44||44||39||39||44||44|
|X-ray sensitive surface [mm x mm]||85 x 170||85 x 255|
|Number of CCD-chips||2||3|
|Fiber-optic taper demagnification ratio||2.92 : 1||2.92 : 1|
|Pixel in full image||1920 x 3840||1920 x 5760|
|Pixel size in full image [μm]||44||44|
|Detective quantum efficiency (DQE) at 8-12 keV||up to 0.8|
|Point spread function||
FWHM < 100 μm
FW 1% < 300 μm
|Gain (electrons per 12 keV X-ray photon)||70 e¯|
|Read-out noise in standard readout mode||< 8 e¯/pixel|
|Pixels per chip||1920 x 1920|
|No. of on-chip read-out channels||16|
|Dark current at -80°C||≤ 0.003 e¯/pixel/sec|
|Full well capacity for 12 keV photons||400 ke¯/pixel|
|Dynamic range||16 bits|
|Phosphor||Gd2O2S:Tb <40 μm thick|
|Weight||< 60 kg|