Download - CFT Occupancy dependence on Beam Luminosity
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CFT Occupancy dependence on Beam Luminosity
David Lam
Oct 2003
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CFT Occupancy vs. Luminosity
Choose 3 classes of events for the study: Zero-biased triggered Minimum-biased triggered Jet triggered – JT_45TT specifically
Events with delivered luminosity range from 6E30 to ~40E30 (cm-2 s-1)
Two set of events: Set 1: 10 events between Feb and Mar 2003 Set 2: 11 events in August (just before the shutdown)
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Method
Use a modified version of cft_offline_mon Use D0TriggerFilter to pick out the desired
events Since most of the reconstructed events are still
generated using p13, we used raw data instead to get rid of the 20 ADC cut
Plot average occupancy vs. the middle point of the delivered luminosity range.
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Occupancy distribution
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Results
Fitting results show occupancies increased with luminosity as expected Top line: Jet triggered Middle line: Min-biased triggered Bottom line: Zero-biased triggered
MC min-biased and zero-biased events are also included.
When extrapolated, at 200E30, jet triggered occupancy is approximately: 0.233 (CFTX 1)
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Events between Feb. and Mar.
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Events in Aug (before shutdown)
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Result
Zero-biased events triggered on beam crossing: Contain mostly electronic background “noise” Occupancy variation due to p/anti-p halo
Min-based events triggered on collision: Signal in luminosity monitors above threshold on both ends Number of collision increases with luminosity – Poisson
distribution Supposedly, occupancies increase faster with luminosity
compared to zero-biased event. But, slopes for the fits of min-biased events are lower
than zero-biased and jet triggered – so dig deeper….
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Trigger luminosity
Look into the recorded luminosity for each event
Recorded luminosity are stored by luminosity block (lbn), which usually corresponds to time interval of 1 minute.
Plot occupancy vs. record luminosity for each trigger
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Zero-biased Events (Set 1)
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Zero-biased Events (Set 2)
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Result (cont.)
Both set of zero-biased events have positive dependencies on luminosity
However, for set 1 min-biased events, some funny looking structure in the plot
Set 2 min-biased events have occupancies DECREASE with increasing luminosity
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Min-biased Events (Set 1)
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Min-biased Events (Set 2)
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Jet triggered Events (Set 1)
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Jet triggered Events (Set 2)
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Jet-triggered events recorded luminosity distribution
Set 1
Set 2
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Jet triggered result
Set 1 jet triggered occupancies increase with increasing luminosity in range 0 – 900 ub-1
But set 2 occupancies DECREASE with increasing luminosity in range 0 – 150 ub-1
Why the range of recorded luminosity differed? Given that the delivered luminosity range are the same in both sets.
Comments? Suggestions?