View Major System Components PDF (342k)
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Setting the Standard Again
The state-of-the-art in CCD X-ray detector technology. Designed in co-operation with five of the world's leading CCD detector experts. Incorporating premium quality components assembled under strict quality control standards.
Development
Quantum CCD detectors are a co-operative development between ADSC and five of the world's leading CCD detector experts; Professor Sol Gruner and Dr. Mark Tate of Princeton University, Professor Eric Eickenberry of UMDNJ-Robert Wood Johnson Medical School and Professor Walter Phillips and Dr. Martin Staton of Brandeis University.Basic Principles
The three main components of the Quantum CCD detector are phosphor screen (to convert X-rays to light), fiber-optic taper (to demagnify the light image down to the size of the CCD chip), and CCD chip to detect the light image as an electric charge image.
The electric charge image is read out of the CCD chip and digitized (converted to binary numbers) then fed into a computer. After geometric and intensity corrections are applied, the resulting data are similar to data from other types of X-ray detectors and can be processed by most standard software packages.
Modular Design
The Quantum CCD detectors are based on a patented modular design. Modules can be tightly stacked into 2 x 2 or larger arrays to increase the active area without adding additional readout time (all the modules are read out in parallel).ADSC has develoepd the Quantum 4R and Quantum 210 detector. Both are a 2 x 2 array of detector modules packaged in a larger enclosure. The Quantum 4R has a total active area of 188mm x 188mm and 82 micron pixels in a 2300 grid. The larger Quantum 210 has a total active area of 210mm x 210mm and 51 micron pixels in a 4096 grid.
ADSC has also developed an even larger detector, the Quantum 315. The Quantum 315 is a 3 x 3 array of detector modules. The active area is 315mm x 315mm and 51 micron piels in a 6144 grid.
Detector Packages
Detector systems are packaged with all required computer hardware and software to interface the detector to a beam line. A dual 3.0 GHz Xeon processor Linux workstation computer with 2 GB of memory and a two terabyte hardware RAID is provided as the primary computing and storage platform for the detector system. A set of 3.08 GHz P4 frame grabber computers provides the interface to the detector controllers, one frame grabber computer per detector module. Each frame grabber computer has 2 GB of memory, providing substantial data buffering and allowing data collection to proceed at the fastest speed possible. The frame grabber computers are interfaced to the RAID computer via gigabit Ethernet using a 12 port Dell gigabit switch.Modular software is included with the detector systems so that local beam line staff can interface the detector directly to their own data collection sequencer and graphical user interface. No performance is lost if local beam line software is used rather than ADSC supplied software. ADSC software can be used if desired to provide control and user interface functions. Regardless of which interface method is selected, ADSC provides on site interfacing assistance to local beam line staff as part of the detector installation and acceptance procedure.
Goniostats from CrystalLogic Inc. of Los Angeles can be provided as part of an integrated system solution.
Quality
The Quantum CCD detectors are manufactured to the very strict quality standards that are a tradition at ADSC. Premium quality components must pass thorough inspection and testing before they are used in the ADSC CCD detector systems.Control Software
The
ADSC software package for Quantum CCD detector
systems is derived from ADSC's proven image plate software. It has been
enhanced to be even more flexible and easy to use. Important features include:
Modular design
Software modules are interconnected via TCP/IP network sockets allowing for distributed processing among several CPU's and for remote operation of the control Graphical User Interface (GUI).Easy-to-use control GUI
From here, it is easy to start and stop data collection, to display images either one at a time or as they are taken, and to launch other GUI's to perform data reduction or calculate an optimum data collection strategy.Processing Software
Easy-to-use, convenient GUI's for MOSFLM or DENZO data reduction software are available for the Quantum CCD detectors. Data processing is conveniently organized and simple to run with this package. A real-time mode is available so that data processing can run concurrently with data collection providing immediate data quality feedback.View Major System Components PDF (342k)
