| Autor: |
Schmiedmayer, J., Pernicka, M., Moxon, M.C. |
| Zdroj: |
Nuclear Instruments and Methods in Physics Research Section A; March 1989, Vol. 276 Issue: 1-2 p250-257, 8p |
| Abstrakt: |
A CAMAC module has been developed to record simultaneously the pulse height and the elapsed time of an event following a start signal. The module is based on an 8-bit (256-channel) 100 MHz fast analog to digital converter (FADC) and a 16-bit (65536-channel) time digitizer with a maximum time range of 4.9 ms and a minimum resolving time of 20 ns. A short dead time in the data acquisition equipment is required to keep count loss corrections to an acceptable level at high count rates. The processing of the signal including storage of the data in a 256-word buffer takes place during the 10 ns dead time of the module. A built-in digital to analog converter (DAC) can be used to set up and test the module. The unit can be used in several different ways, for example (a) as a multiparameter neutron time-of-flight spectrometer, (b) as a transient wave recorder with a continuous read-in, (c) as a transient wave recorder with a 16-block read-in and (d) as a self-triggering digital discriminator. In this report a description is given of the use of the system in neutron transmission measurements using the pulsed neutron source HELIOS at Harwell. In these measurements the count rates were several times the highest count rate previously recorded on such experiments at Harwell. The count loss and background were more easily and more accurately calculated from the information gained from the two-dimensional recording of the data. |
| Databáze: |
Supplemental Index |
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