Only diagnostic cameras as of now. No GigE cameras yet.
Laser System
Cameras:
triggered during experiment.
recorded during experiment.
Operation
May need data from ramp up/down.
Need timestamping
To be meticulous: Trigger then readback
Rough estimate: Just readback
LLNL would like a DAQ for their system for testing.
What does the DAQ provide and what does LLNL need to provide in order to keep the data structure.
EPICS collection vs DAQ collection
EPICS is great until about 120 Hz timestamp.
DAQ for LCLS2 is built to be able to handle 1MHz timestamping.
Reproduce everything that happened, shot by shot.
Not recording every single event.
EPICS doesn't play nice with this.
Doesn't readout the same way, doesn't like timestamping this way
IOC timestamp data via TPR
Need to start the DAQ then press record.
DAQ stores EPICS images.
using PV access.
Question from Jana: Should DAQ be ingesting the EPICS information and storing it along side the science information or create a new category of diagnostic data for laser systems.
EPICS archiving engine is totally unrelated to DAQ
Limitations of EPICS achiever that would push to DAQ
All the acruchema of the DAQ
DAQ integration with e-log and analysis system
Operationally the laser systems should be able to use the DAQ subsystem.
Something would need to be build to grab the info from the EPICS achiever to the e-log.
DAQ can take in a lot of data and do a lot of computing but this introduces a lot of complexity.
DRP in the DAQ allows us to dial back the data rate, choose events.
There is a new higher-performance EPICS archiver (what is the name?)
The current DAQ will work if we avoid from downloading too many files.
DAQ Tools
Small data tools:
Is a current software to process data files.
Can store image as XTCs and have tiff conversions on demand.
Currently we create one tiff file per image as well as an hdf5. Capturing this all day for a 12 hour shift at 10hz would break the file system.
Potential to break file system if we blindly create tiffs per image.
AMI (A Monitoring Interface)
SLAC in-house tool.
AMI is written to be much simpler.
AMI is data visualization.
Main real-time DAQ to give you a live-view.
LCLS2 DAQ seems like too much, too big.
DAQ Supported Device List
CamLink Cameras
SLAC built cameras
If there's an epics PV then the DAQ will pull from it.
LLE Laser
The DAQ is currently used to get data from the current MEC Long Pulse.
The DAQ is always recording, but every time it gets a trigger it records it.
Time frame to cycle back:
Jana is away for the next three weeks.
Barry Fishler Write down requirements for Data Archiver System. Jana will be back Sept 12th
Pull Chris O'Grady, Dan, Murali, Matt Weaver on possible EPICS/DAQ solutions.
Contact Amedeo for IT Infrastructure build for MEC-U Mitchell Cabral