H. Nakanishi, M. Kojima, M. Ohsuna, S. Komada, M. Emoto, H. Sugisaki, S. Sudo and LABCOM group


Distributed Mass Data Acquisition System Based on PCs and Windows NT for LHD Fusion Plasma Experiment

Date of publication:


Key words:

LHD, DAQ, LABCOM system, MPP, Windows NT, SCSI optical extender, CAMAC software list sequencer, Diagnostics Control VME, Digitally-synchronized timing system, HSM, ODBMS


A new data acquisition and management system has been developed for the LHD experiment. It has the capability to process 100 MB~1 GB raw data within a few tens seconds after every plasma discharge. It employs wholly distributed and loosely-tied parallel-tasking structure through a fast netwark, and the cluster of the distributed database serves seems to be a virtual macro-machine as a whole. A PC/Windows NT computer is installed for each diagnostics data acquisition of about 30 kinds, and it controls CAMAC digitizers through the optical SCSI extenders. The diagnostic timing system consists of some kinds of VME modules that are installed to remotely control the diagnostic devices in real-time. They can, as a whole system, distribute the synchronous sampling clocs and programmable triggers for measurement digitizers. The data retrieving terminals can access databases as application service clients, and are functionally separated from the data acqusition servers by way of the switching Ethernet

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