LAT Trigger
Communications
Mailing list:
Post to the LAT trigger mailing list at triggerlist@glast.stanford.edu
which also has an Archive. You can subscribe to the list through the GLAST Mailing list page.
Phone numbers, E-mails
Trigger meetings
How to post material to trigger meetings and mailing list
Commissioning and Testing
- Trigger Scheduler and Context:
The following table gives a representation of the Trigger Scheduler table and TAM Context information for the LAT muon runs to be taken during Commissioning. Those muon runs are designated by test cases LAT-70x (flight configuration on ground) and LAT-71x (muon calibration). The scheduler is shown in a form compatible with the online tool to generate trigger configurations, where the trigger engines are specified in hierarchical order.
Engine |
external |
solicited |
periodic |
CNO |
CAL-HI |
CAL-LO |
TKR |
ROI |
Zero-supp |
Ranges |
Prescale |
Marker |
Inhibit |
Avg Rate (Hz) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0 |
1 |
x |
x |
x |
x |
x |
x |
x |
enabled |
1-rng |
0 |
0 |
no |
0 |
1 |
0 |
x |
x |
x |
x |
x |
0 |
1 |
enabled |
1-rng |
0 |
0 |
no |
0 |
2 |
0 |
1 |
x |
x |
x |
x |
x |
x |
enabled |
1-rng |
0 |
0 |
no |
0 |
3 |
0 |
0 |
1 |
x |
x |
x |
x |
x |
disabled |
4-rng |
0 |
0 |
no |
2 |
4 |
0 |
0 |
0 |
1 |
x |
1 |
1 |
1 |
enabled |
4-rng |
0 |
0 |
no |
200 |
5 |
0 |
0 |
0 |
1 |
x |
x |
x |
x |
enabled |
1-rng |
255 |
0 |
no |
5 |
6 |
0 |
0 |
0 |
0 |
1 |
x |
x |
x |
enabled |
1-rng |
0 |
0 |
no |
100 |
7 |
0 |
0 |
0 |
0 |
0 |
x |
1 |
0 |
enabled |
1-rng |
0 |
0 |
no |
1500 |
8 |
0 |
0 |
0 |
0 |
0 |
1 |
0 |
0 |
enabled |
1-rng |
0 |
0 |
no |
400 |
9 |
0 |
0 |
0 |
0 |
0 |
1 |
1 |
1 |
enabled |
1-rng |
0 |
0 |
no |
700 |
10 |
0 |
0 |
0 |
0 |
0 |
0 |
1 |
1 |
enabled |
1-rng |
49 |
0 |
no |
100 |
11 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
enabled |
1-rng |
0 |
0 |
no |
0 |
12-14 |
|
|
|
|
|
|
|
|
|
|
|
0 |
inhibit |
|
15 |
|
|
|
|
|
|
|
|
|
|
|
5 |
no |
|
In this table, 1 = asserted, 0 = not asserted, and x = "don't care". The Contrigurator evaluates the rule for engine 0 first, and given the rule above assigns 128 combinations of trigger conditions to engine 0. It then evaluates the rule for engine 1, and from the remaining 128 unassigned combinations, it assigns the 32 combinations that are consistent with the rule to engine 1. This continues on through engine 11, where the last of the 256 possible combinations -- in this case, no conditions asserted -- is mapped to engine 11.
- GASU based teststands (LAT-TD-03664)
- The LAT Communications Board:
Conceptual Design, Schematics, Programming ICD spec (TD-00860)
Triggering the LAT in the LATTE environment (draft by Jim Panetta) - LAT geometry: SVAC analysis Primer, SVAC geometry page, LAT coordinate system
- ROOT analyses: Digi Variables, Recon Variables, Trigger Analysis Utilities
- Gary Godfrey's particle test page containing info on muon telescope and EM1 timing tests
- Hiro Tajima's tracker EM1 test (inc trigger timing issues): Dec/03, Jan/04
Reviews & Presentations
- DOE/NASA baseline Preliminary Design Review (Jan/02): Science Requirements & Instrument Design (Steve Ritz)
- Trigger & Dataflow Preliminary Design Review (Aug/01): Trigger system (JJ Russell)
Specifications and Technical Design Information
- LAT Trigger Level 4 Specification (LAT-SS-00284)
- Global Trigger Conceptual Design (LAT-SS-00286)
- Event Filtering Software Trigger
- Programming ICD specifications: GEM, TEM, Trigger ACD hit maps
- Frontend specifications: GTRC, GCRC
- Jeff Olsen's GLT design documentations
Useful Links
LAT document search
The JIRA software issue tracking system
I&T links: Online, facilities and integration, Instrument Analysis Group
Subsystems: Traker ELPDR, CAL Peer review, ACD electronics, Elex Hardware, Flight software docs
Building 33 cameras, Building 33 phones