Glossary
- Autoreducer
Server where an instance of Post-Processing Agent is running.
- Autoreduction
Automated data reduction that can be triggered when the run NeXuS data file is available. The instrument-specific autoreduction process is configured by the instrument scientist. Autoreduction is a step in the post-processing workflow.
- Cataloging
Cataloging of experiment data in ONCat. Cataloging is a step in the post-processing workflow.
- DAS
Data Acquisition System.
- DASMON
Data Acquisition System Monitor (DASMON) is a per-beamline service that reports PV values and experiment/run meta-data to WebMon. Due to the high volume of PV updates, DASMON writes PV updates straight to the database. DASMON reports its status to WebMon for system diagnostics.
- Dasmon listener
Service that subscribes to messages from DASMON and writes to the database.
- HFIR
The High-Flux Isotope Reactor at Oak Ridge National Laboratory.
- IPTS
Integrated Proposal Tracking System (IPTS) number is the experiment’s proposal ID that is used for grouping runs.
- Live Data Server
Service that serves plots to the WebMon front-end. Livereduce and autoreduction can publish plots for a run to Live Data Server.
- Livereduce
Service for live monitoring of the data stream for the creation of plots which are published to the Live Data Server.
- NeXuS
Data format for neutron, x-ray, and muon science.
- ONCat
Catalog for neutron experiment data at SNS and HFIR: https://oncat.ornl.gov.
- Post-Processing Agent
Service that performs post-processing tasks like cataloging and autoreduction.
- PV
Process Variables (PVs) are variables coming from the control system and can include sample environment variables (e.g. temperature, magnetic field), instrument geometry and experiment metadata. Subsets of PVs are used for monitoring experiments.
- PVSD
- Process Variable Streaming Daemon
Per-beamline service that subscribes to EPICS Control System PV:s and forwards PV value changes to the SMS. PVSD reports its status to WebMon for system diagnostics.
- SMS
Stream Management Service (SMS) is a service that aggregates data from fast neutron event data and slow PVs into a data stream available for both live monitoring and file archiving. SMS reports its status to WebMon for system diagnostics.
- SNS
The Spallation Neutron Source at Oak Ridge National Laboratory.
- STC
Streaming Translation Client (STC) is a service that translates the experiment data stream from SMS to a NeXus data file. Triggers the post-processing workflow after the NeXus file has been created.
- WebMon
Monitor for instrument status and autoreduction status at SNS and HFIR. WebMon can refer to either the whole system or the landing page at https://monitor.sns.gov.
- Workflow
Experiment data post-processing workflow. The available tasks are cataloging, autoreduction and reduced data cataloging.
- Workflow Manager
Service that orchestrates the autoreduction/post-processing workflow.