| Paper | Title | Page |
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| WEPD16 | Development of Data Acquisition Software for VME Based System | 35 |
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A Data Acquisition system for VME has been developed for use in accelerator based experiments. It is in use at BARC-TIFR laboratory. The development was motivated by the growing demand for higher throughput in view of the increasing size of experiments. The VME based data acquisition system provides a powerful alternative to CAMAC standards on account of higher readout speeds (100 ns/word) resulting in reduced dead time. Further, high density VME modules are capable of providing up to 640 channels in a single VME crate with 21 slots. The software system LAMPS[1], earlier developed for CAMAC based system and used extensively in our laboratory and elsewhere has been modified for the present VME based system. The system makes use of the VME library to implement Chain Block Transfer Readout (CBLT) and gives the option of both Polling and Interrupt mode to acquire data. Practical throughput of ~250 ns/word in zero-suppressed mode have been achieved. The developed software currently supports CAEN[2] V785 ADC, V775 TDC and V862 QDC and V830 Scalar Modules. The design, development and architecture of this DAQ system will be discussed.
[1] http://www.tifr.res.in/~pell/lamps.html [2] http://caen.it/ |
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