Charge Detector Array
Results and Performance
The charge detector array has been in use at Aberystwyth since April 2004 and has been used at the Synchrotron Radiation Source at the Daresbury Laboratories on a number of occasions since then.
The results presented here are a small sample of some of the key performance indicators for the detector. Also included are some application results showing how the use of an array detector such as the Aberystwyth MCD can radically improve the science being carried out.
The detector can count incoming electrons at a maximum rate in excess of 40K counts per second per pixel. As this is a truly parallel device, the overall count rate across the 768 channel array is in excess of 30M counts per second. This count rate is limited by the microchannel plates used (Hamamatsu 12um pore plates).
Once the counts are accumulated on the detector chip, the control electronics will then read back the counter data before initiating another reading cycle. At present the readout rate from the detector to the control electronics is set at 2uS/pixel, leading to a readout time of 1.5ms for the 768 channel device.
With any array detector there will be a variation in sensitivity from channel to channel. For this detector, the rms uniformity of pixel to pixel variation is 8%.
The detector array has been used to study the deposition of Copper Phtalocynanine in real time.
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