The main aim of the
COMPASS Detector Control System (DCS) is to
provide the control of all the COMPASS setup parameters during long-term
periods of data taking, as well as for the beam tests at construction
It includes the control of the
High Voltage and Low Voltage systems, Gas supplies, Racks and Crates with
electronics, as well as the monitoring of slowly varying parameters (e.g
pressure, temperature, etc); and status of experiment-wide infrastructure
items, like the cooling water system. The DCS does not include the Run
Control of the COMPASS experiment, which is performed by the Data
Acquisition System (DAQ).
The DCS uses a commercial SCADA
(Supervisory Controls and Data Acquisition system), called
PVSS. To allow for easier navigation in the
system, integration of new devices, changing of parameters, etc, the
JCOP Framework and the
COMPASS Framework are used as upper layers.
While some devices communicate with
PVSS through OPC Servers, others
(the CAEN modules, for example) use the SLIC
package, developed at CERN (like a drivers' collection). The communication
between the PVSS and the SLIC is done using DIM,
another CERN developed product.