Download presentation
Presentation is loading. Please wait.
1
1 Background Monitoring in the DIRC MDI meeting, May 25 th 2006 Nicolas Arnaud Automatic monitoring A few plots What’s next?
2
2 DIRC background monitoring Package DrcBackgroundMonitor Dedicated (software) IOC: drc-soft Code developped between August and October 2005 Motivation: period of high background in the DIRC (June-July 2005) Plots produced daily since the startup of Run 5b ‘Daily’ plots (last 3 shifts) updated around 08:20 every morning Cover previous day, swing and owl shifts ‘Biweekly’ plots (last 14 days) updated daily right after Midnight including plot for the weekly background report All plots easily available via webpages automatically updated: Most recent plots: http://www.slac.stanford.edu/BFROOT/www/Detector/DIRC/BackgroundMonitoring/Html/dailyPlots.html Archives: http://www.slac.stanford.edu/BFROOT/www/Detector/DIRC/BackgroundMonitoring/Html/plotTables.html Background monitoring central webpage: http://www.slac.stanford.edu/BFROOT/www/Detector/DIRC/BackgroundMonitoring/
3
3 Plots: the ‘storm’ period between Tuesday and Wednesday Scaler comparison: raw rates (kHz) Scaler comparison: rate ratios 400 kHz 1 2
4
4 Plots: things get better in the next 24 hours period 400 kHz 1 2 Scaler comparison: raw rates (kHz) Scaler comparison: rate ratios
5
5 Plots: background increase quicker than ‘expected’
6
6 Plots: background change between last week and this week A different tuning!?
7
7 Plots: difference visible in the scope plot as well More background The ‘storm’
8
8 Plots: Backgrounds were lower last October Smoother increase of scaler rate with growing luminosity All scaler rates below 300 kHz even with lumi above 9!
9
9 What’s next Daily survey of the scaler rates Shifter instructions updated Do operators know about DIRC signals? Were they told to use them to tune the beams? Look for source(s) of new background (Jerry, back at SLAC end of the month) Discuss background issues during next DIRC meetings Question: do we need additional shielding? [Certainly too early to answer now] Present setup of scalers (12 DIRC scalers + 3 neutron counters): Integrate hits during 0.5 second every 4 seconds Impossible to get quantities insensitive to trickle injection with this config Background characterization MD should come neither too early nor too late…
Similar presentations
© 2025 SlidePlayer.com. Inc.
All rights reserved.