Automatic Control Program for Spear

Automatic Control Program for Spear

Spear -present Status and Improvement Program*

Initial operating experience with the SLAC electron-positron storage ring SPEAR is described. A single-beam coherent instability, which can be suppressed either by control of the ring chromaticity or by feedback, has been observed. A second single-beam coherent instability has been observed at currents around 50 mA and is not yet understood. Current-dependent bunch lengthening and widening have...

Automatic Vehicle Control Developments in the PATH Program

The accomplishments to date on the development of automatic vehicle control (AVC) technology in the Program on Advanced Technology for the Highway (PATH) at the University of California, Berkeley, are summarized. The basic prqfiiples and assumptions underlying the PATH work are identified, ‘followed by explanations of the work on automating vehicle lateral (steering) and longitudinal (spacing a...

Old Wine in New Bottles—the Spear Control System Upgrade

The control systems for the SPEAR storage ring and injector were designed almost two decades ago and have worked reliably for us. Both systems are heavily dependent on the OpenVMS operating system and CAMAC. The realtime data reside in shared memory on a single computer for each control system. In order to use more modern client tools while preserving our investment in the hardware and software...

Experimental values for adjusting an automatic control valve in gas pipeline transportation

When a natural gas pipeline ruptures, the adjacent automatic line control valves (ALCVs) should close quickly to prevent leakage or explosion. The differential pressure set point (DPS) at each valve location is the main criteria for value setting in ALCV action. If the DPS is not properly adjusted, the ALCV may mistakenly close or it may not take any action at proper time. This study focused on...