TWiki> Main Web>TriggersAndPrescalesPisa (2010-01-27, PaoloFrancavilla) EditAttachPDF

Examples on how to use Triggers and Prescales

In this twiki we show an example on how the prescales work and on how obtain the needed information from the Trigger Software.

Trigger and Prescale chain

Useful links

An Example

Event     1 2 3 4 5 6
Level 1 Decision 0 1 1 1 1 1 1
Level1 Prescale X 0 1 1 1 1 1
Level2 Prescale X X 0 1 1 1 1
Level 2 Decision X X X 0 1 1 1
Event Filter Prescale X X X X 0 1 1
Event Filter Decision X X X X X 0 1
    200 500 250 50 100 20 80

The total number of events which pass the level 1 decision is 1000, but only 8 of them are saved in the disk.

Without prescales, the efficiency would be 0.8*0.8=0.64. The number of events that could pass the trigger is 640, but due to a prescale

2x2x2=8, the number of events is 640/8=80.

Event     1 2 3 4 5 6
Level 1 Decision 0 1 1 1 1 1 1
Level1 Prescale X 0 1 1 1 1 1
Level2 Prescale X X 0 1 1 1 1
Level 2 Decision X X X 0 1 1 1
Event Filter Prescale X X X X 0 1 1
Event Filter Decision X X X X X 0 1
                 

Bootstrap

Resurrection

-- PaoloFrancavilla - 21-Jan-2010

Attachments Attachments
Topic attachments
I Attachment History Action Size Date Who Comment
GIFgif TriggerExample.gif r1 manage 32.5 K 2010-01-27 - 17:36 PaoloFrancavilla  
Edit | Attach | Watch | Print version | History: r4 < r3 < r2 < r1 | Backlinks | Raw View | WYSIWYG | More topic actions
Topic revision: r4 - 2010-01-27 - PaoloFrancavilla
 
    • Cern Search Icon Cern Search
    • TWiki Search Icon TWiki Search
    • Google Search Icon Google Search

    Main All webs login

This site is powered by the TWiki collaboration platform Powered by PerlCopyright &© 2008-2024 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