Data Acquisition and Analysis on the High Resolution Magnetic Spectrometers at LAMPF

The data acquisition and analysis system for LAMPF\´S high resolution magnetic spectrometers, HRS and EPICS, consists of two on-line PDP-11/45 computers and an off-line PDP-11/60 for analysis of taped data. Each system has 124K words of memory and runs under DEC\´s RSX-11D operating system. The on-line computers are interfaced to several CAMAC crates through a Microprogrammable Branch Driver (MBD). Each system is also equipped with two Tektronix 4010 terminals, a Versatec printer/plotter, at least one RK05 disk drive, a 9 track 75 IPS 800/1600 BPI Kennedy tape drive, and a 40MB Diva/Calcomp disk drive system which is compatible with DEC software for their RP03. The software developed for these systems was designed to meet the goals of flexibility and speed of analysis for multiparameter data (20-100 words/event). The LAMPF standard data aquisition package "O" and its associated routines for histogram management are used as the basis of the system. A number of additional features have been added whose usefulness appears to he common to most experiments of this type.