EPICS Base

EPICS Base
Name	EPICS Base
Developer	Los Alamos National Laboratory; Argonne National Laboratory; Lawrence Berkeley National Laboratory; Brookhaven National Laboratory
Released	1991
Latest release	7.x
Programming language	C; C++
Operating system	Linux; macOS; Windows
License	EPICS Open License

EPICS Base EPICS Base is a software toolkit for building distributed control systems used in scientific facilities. It provides a core set of libraries, communication protocols, and runtime services to support instrumentation at places such as SLAC National Accelerator Laboratory, CERN, Fermilab, and Diamond Light Source. The project underpins experiments and observatories operated by institutions including Oak Ridge National Laboratory and Deutsches Elektronen-Synchrotron.

Overview

EPICS Base offers an event-driven framework, network protocol, and set of runtime components enabling control of hardware like vacuum pumps, magnet power supplies, and beamline detectors at sites such as European XFEL, ISIS Neutron and Muon Source, and Paul Scherrer Institut. It includes process variable services, channel access protocols, and a record-based database model that integrates with tools from Argonne National Laboratory, Brookhaven National Laboratory, and Lawrence Berkeley National Laboratory. The toolkit is used alongside control-room software from vendors and collaborations including National Institute of Standards and Technology and Fermi National Accelerator Laboratory.

History and Development

Development began in the early 1990s at national laboratories including Los Alamos National Laboratory and Argonne National Laboratory to modernize control systems for accelerators and beamlines at facilities such as Stanford Linear Accelerator Center and Brookhaven National Laboratory. Major milestones include adoption of the channel access protocol and later enhancements to support EPICS Channel Access alternatives and real-time portability across platforms used by CERN and DESY. Contributions have come from organizations like Lawrence Berkeley National Laboratory, Oak Ridge National Laboratory, and international partners such as European Molecular Biology Laboratory. The project evolved through collaborative releases, with governance influenced by consortia that include representatives from SLAC National Accelerator Laboratory and national funding agencies.

Architecture and Components

The core runtime implements a record-oriented database, network communication, and device support layers used by control systems at facilities such as Fermilab and Diamond Light Source. Key components include the I/O controller which runs device support, channel access servers that provide process variable access to clients like operator interfaces developed at Lawrence Berkeley National Laboratory or Brookhaven National Laboratory, and sequencer modules used at ISIS Neutron and Muon Source. EPICS integrates with operator display tools, alarming, archiving, and data acquisition frameworks deployed at European XFEL, Paul Scherrer Institut, and DESY. The architecture supports modular device drivers, database definition files, and network-transparent client libraries employed by software stacks at CERN and Oak Ridge National Laboratory.

Supported Platforms and Dependencies

The toolkit is portable across POSIX environments such as Linux distributions used at CERN and SLAC National Accelerator Laboratory, and has ports for macOS and Windows deployments found in campus laboratories and industrial testbeds. It depends on compilers for C and C++, build tools common at Lawrence Berkeley National Laboratory and Brookhaven National Laboratory, and optional integration libraries provided by third parties used at Deutsches Elektronen-Synchrotron and Fermilab. Real-time extensions and support libraries allow deployments on RTOS platforms prevalent in industrial control and research facilities including Oak Ridge National Laboratory testbeds.

Configuration and Deployment

Configuration uses database definition files, startup scripts, and build-time options adopted at accelerator centers such as SLAC National Accelerator Laboratory and synchrotron facilities like Diamond Light Source. Deployment patterns include centralized control rooms and distributed front-end crates interfacing with PLCs and motion controllers used at European XFEL and ISIS Neutron and Muon Source. Tools for packaging, versioning, and continuous integration are used by laboratory software teams at Brookhaven National Laboratory and Lawrence Berkeley National Laboratory to manage releases, while site-specific customization is common at Fermilab and Paul Scherrer Institut.

Use Cases and Applications

EPICS Base is applied to beamline control, accelerator subsystem management, cryogenic plant control, and detector readout in installations such as CERN, Fermilab, Diamond Light Source, and European XFEL. It underlies experiment control suites, automated tuning systems, and data acquisition integration at facilities including ISIS Neutron and Muon Source and Paul Scherrer Institut. The software is often combined with scientific computing environments and data management systems used by collaborations at Los Alamos National Laboratory and Argonne National Laboratory to coordinate measurement campaigns and commissioning activities.

Community and Governance

Project stewardship involves laboratory contributors from Los Alamos National Laboratory, Argonne National Laboratory, Lawrence Berkeley National Laboratory, and members representing user facilities such as SLAC National Accelerator Laboratory and Brookhaven National Laboratory. Development is coordinated through working groups, bug-tracking and mailing lists frequented by engineers from CERN and DESY, and regular technical meetings held among stakeholders from Oak Ridge National Laboratory and international partners. Training, documentation, and collaborative outreach occur via site workshops and consortium events sponsored by national labs and research institutions including Fermilab and European XFEL.

Category:Control system software