Data acquisition system for Texas turbulent torus

A 96 K PDP 11/45 computer system is used to provide on-line data processing and concurrent program development. Typically 15 analog data channels are sampled by an array of transient recorders at rates between 10 and 200 nsec, producing about 104 data bytes per shot. The data is transferred to computer memory by a multiplexer and asynchronous bit-parallel data link. Two storage tube graphic display terminals provide interactive control of program execution, entry of calibration information, and display of raw or processed data. All data is archived on tape for review, reprocessing and off-line testing of program modifications. Data reduction for each diagnostic is Fortran coded. Processing has been implemented for five plasma diagnostics. Display of processed data begins about 10 seconds after each shot