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A sixteen channel peak sensing ADC for singles spectra in the FERA format

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5 Author(s)
M. R. Maier ; Div. of Eng., Lawrence Berkeley Lab., CA, USA ; B. Ludewigt ; C. Rossington ; H. Yaver
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To read out multi-element small X-ray detectors for X-ray fluorescence applications with synchrotron radiation one needs the capability to record multiple singles spectra for each detector element at high rates. We have developed a sixteen channel 11 bit peak sensing ADC in a CAMAC module. We use the FERA readout bus to place the data into a commercially available histogramming module developed to generate multiple histograms from FERA ADCs. The sixteen channels digitize shaped pulses from the detectors without external gating. The digitizing time is 8 μsec, the peak acquisition time is ⩾2 μsec. The module contains a LIFO to permit block transfers in order to minimize dead times associated with the readout. There is a common CAMAC controlled analog threshold for noise suppression and a 16 bit mask to enable or disable individual ADCs. Differential nonlinearity is less than +8%/-4%. γ-ray spectra collected using these ADCs are presented

Published in:

Nuclear Science Symposium and Medical Imaging Conference Record, 1995., 1995 IEEE  (Volume:1 )

Date of Conference:

21-28 Oct 1995