3.13 Summary

The DELPHI Slow Controls system has been in operation since the LEP pilot run in August of 1989, though the system has been improved significantly since then, culminating in the system described in this chapter.3.7Over this time, as higher and higher level systems have been added, the Slow Controls system has taken over the functions previously performed manually by detector experts. Along with analogous improvements in the Data Acquisition system, this has reduced the number of people required on shift from around twenty to three, allowing detector experts more time to spend on physics analysis.

By the end of 1993, DELPHI had recorded the results of about two million $ \ensuremathbox{\mathrm{Z^0}}$-decays, as well as Bhabha events used to measure the luminosity. The automation of the Slow Controls system (particularly the reduction in high voltage ramping times at the start and end of LEP fills) has made a significant contribution to improving the efficiency (live-time) of datataking, which in 1993 reached an average of 90% over 1500 hours of datataking.3.8

Tim Adye 2002-11-06