The SLHC CMS L1 Pixel Trigger Detector Layout Wu, Jinyuan Fermilab April 2006.
L1 Trigger Rate Study
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Transcript of L1 Trigger Rate Study
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L1 Trigger Rate Study
Nathaniel Amos
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Part 1
• GMT Eta Distributions
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GMT Eta Distribution
• Studied Eta distribution of GMT output• Can be used to estimate GMT Rate in Eta• Data sample taken from: – Runs: 190389-194115– HLT_L1SingleMuOpen and json_DSConly.txt
• GMT Qualities selected:– Quality 5: RPC Only– Quality 6: DT or CSC, No RPC– Quality 7: DT/RPC or CSC/RPC
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GMT Eta Distribution
Eta
Spikes
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What causes the spikes?
• Observe each subsystem independently– Observe GMT-DT matches at GMT Quality 6, 7– Observe GMT-CSC matches at GMT Quality 6, 7• If GMT Eta > 2.1, require CSCTF Mode 5
– Observe RPC-GMT matches at GMT Quality 5 and GMT BX = 0
• Plot each Eta distribution
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GMT-CSC Matches at Quality = 6
Eta
No spike observed at |Eta| = 1.0
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GMT-CSC Matches at Quality = 7
Eta
No spike observed at |Eta| = 1.0
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GMT-CSC Matches at 5 ≤ Quality ≤ 7
Eta
No spike observed at |Eta| = 1.0
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GMT-RPC Matches at Quality = 5
Eta
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GMT-DT Matches at Quality = 6
Eta
Spikes
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GMT-DT Matches at Quality = 7
Eta
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GMT-DT Matches at 5 ≤ Quality ≤ 7
Eta
Spikes
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Part 2
• GMT Relative Rates
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Relative GMT Matches
• Plot number of GMT-subsystem matches relative to total number of GMT matches– Plotted for each category (below)
• Define several categories for matches:– DT, |Eta| < 0.9– CSC, 1.2 < |Eta| < 2.1
• or 1.2 < |Eta| < 2.0 (See next slides)– RPC, |Eta| < 1.6– DT Overlap, 0.9 < |Eta| < 1.2– CSC Overlap, 0.9 < |Eta| < 1.2
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Two Methods of Plotting• Plot GMT-subsystem matches divided by total
number of GMT matches (referred to as “relative counts”)
• Plot GMT-subsystem matches divided by total number of GMT matches per subsystem region width (a type of rate density)– Example:
• CSC (1.2 < |Eta| < 2.1): each Eta bin has width of Eta = 0.1• Therefore CSC relative counts divided by 18 bins
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Relative Counts, |Eta| < 2.1
60% of the GMT matches come from the CSCs.
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Relative Counts Per Region Width,|Eta| < 2.1
The spikes we saw in the Overlap region from the DT each come in a single bin (Eta = ±1.0)
The DT overlap region produces a much greater contribution per bin.
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Relative Counts, |Eta| < 2.0
Now, with |Eta| strictly less than 2.0, the CSCs are seen to contribute less than 30% of the GMT tracks (outside the overlap region).
A lot of rate is bottled up in that extra Eta bin at ±2.1 (some tracks maybe have ME1/1 A station).
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Relative Counts Per Region Width, |Eta| < 2.0
Once again, with the width of the full region reduced from |Eta| < 2.1 to |Eta|< 2.0, the CSCs are seen to contribute much less rate.
The DT Overlap’s spikes are very apparent here.
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Conclusions
• Spikes do not appear to come from CSC– But there is a lot of rate at 2.0 <|Eta| < 2.1
• Some tracks may come from ME 1/1A
• DT in overlap region shows spikes– Appears to be Eta = ±1.0
• Plan to repeat study– Use HLT_L1SingleMu10
• More statistics– JSON_MuonPhys.txt
• Exclude possible problems in muon system