1. Experimental Facilities Division ORNL DAQ System Interfaces Neutron Science Software Workshop Oct 13, 2003 Rick Riedel

2. Experimental Facilities Division ORNL Preprocessor Detector Electronics Detectors PT 0 Dis. Module Chopper Dis. Module Slow Controls Timing Module DAS System Diagram Data/File Server Control Computer F.C. SwitchGbit Switch Firewall 2G optical 1G copper

3. Experimental Facilities Division ORNL “Black Box” View Data Source provider. –Data sets could be as large as 35Gbytes –SNS to generate 130 Gbytes/day…26Tbyte/year. –Histogrammed or event mode Command consumer. –Python scripts embedded in XML requests.

4. Experimental Facilities Division ORNL Feedback Requirement Analysis PC, Cluster, Distributed Domain Data/File Server Firewall Python Script Data (live,background,normalization)

5. Experimental Facilities Division ORNL External Interfaces Firewall –“Live” data via internet (low bandwidth). –Python scripting file gateway –Firewall Data/File Server –File based objects –“Live” data (high bandwidth) –Read Access Only –Short term (as defined in DAS requirements)

6. Experimental Facilities Division ORNL Remote Access--Firewall Availability is controlled by instrument scientist. Html (web page) controlled via password and at control computer. Remote Desktop or VNC portal. Port controlled via password.

7. Experimental Facilities Division ORNL Data/File Server A file server (RAID 0/1) handles data access Pre-nexus format—current run Nexus format—completed runs. Data mining database input( to current Oracle database server) Handles backups

8. Experimental Facilities Division ORNL Data Modes Standard=Histogram, PulseMode = Events identified with time stamp and pulse number. Allows cross correlation with ancillary data.

9. Experimental Facilities Division ORNL Histogramming—Loss of Pulse Information Neutron Events TOF X,Y Counts Time, E, Q, d Pixel Spectrum T.O.F., Space bins Frame n+1 Frame n

10. Experimental Facilities Division ORNL Pulse Mode—Retains Pulse Information. Allows use of correlation techniques. Neutron Events TOF X,Y Frame n+1 Frame n +Pulse Stamp Chopper Phase, Magnetic Field, etc. Chopper Phase, Magnetic Field, etc. Ancillary Data +Pulse Stamp