DT Local Trigger Performance plots with 25ns Bunch Crossing

DTLT efficiency as a function of eta, at 50 and 25 ns BX

The Drift Tubes Local Trigger efficiency as a function of the muon track pseudorapidity, for two different BX spacing conditions: 25 and 50 ns.
The efficiency is reported for the station type MB1 of the muon barrel detector. MB1 is the closest station to the interaction point.
Similar results are obtained also for the other muon station types.
The results show no systematic differences in the DT local trigger efficiency for the two data taking conditions.
dtlt_effic_vs_eta_may2013approval.png

Fraction of triggers with two in-time primitives ("in-time ghosts"), at 50 and 25 ns BX

The DT Local Trigger can deliver up to two trigger primitives in a muon chamber, at any BX.
The In-time double trigger fraction is defined as the fraction of cases where two trigger primitives are delivered by the same chamber at the same BX, with respect to the cases when at least one trigger primitive is found.
For single muon tracks crossing a chamber, the in-time double trigger fraction should be as small as possible, to avoid that false copies of a trigger primitive are delivered to the DT Track Finder.
The plot shows the in-time double trigger fraction as a function of the muon track Pt, for the muon stations of type MB1, which are the closest to the interaction point in the muon barrel detector.
Results for the two different BX time-spacing conditions (25 and 50 ns) show that there are no significant differences between the two cases, and that the in-time double trigger fraction does not increase as the BX time-spacing becomes smaller.
intime_vs_pt_may2013approval.png

Fraction of triggers with an extra out-of-time primitive ("out-of-time ghosts"), at 50 and 25 ns BX

The DT Local Trigger delivers trigger primitives withinin a muon chamber, and assigns them the correspondiing BX.
As the system is able to deliver trigger primitives every 25 ns, occasional trigger primitives with a wrong BX assignment can be delivered in addition to the one where the BX is correctly identified.
The out-of-time trigger fraction is defined as the fraction of triggers where two primitives are delivered by the same chamber: one primitive at the correct BX and another one at a wrong BX, with respect to the cases when at least one trigger primitive is found at the correct BX.
For single muon tracks crossing a chamber the out-of-time trigger fraction should be as small as possible, to avoid that false copies of a trigger primitive are delivered to the DT track finder with a wrong BX assignment.
The plot shows the out-of-time trigger fraction as a function of the muon track Pt, for the muon stations of type MB1, which are the closest to the interaction point in the muon barrel detector.
Results for the two different BX time-spacing conditions (25 and 50 ns) show that there are no significant differences between the two cases, and that the out-of-time trigger fraction does not increase as the BX time-spacing becomes smaller.
outtime_vs_pt_may2013approval.png

Edit | Attach | Watch | Print version | History: r7 < r6 < r5 < r4 < r3 | Backlinks | Raw View | WYSIWYG | More topic actions
Topic revision: r7 - 2013-05-29 - FrancescaCavallo
 
    • Cern Search Icon Cern Search
    • TWiki Search Icon TWiki Search
    • Google Search Icon Google Search

    CMSPublic All webs login

This site is powered by the TWiki collaboration platform Powered by PerlCopyright & 2008-2021 by the contributing authors. All material on this collaboration platform is the property of the contributing authors.
or Ideas, requests, problems regarding TWiki? use Discourse or Send feedback