-> look for good overlap in ticks
-> tick range should be fully contained within lower and
(1) GLT Input Lines (9) Timing (16 ticks)
(2) Object Count (17) Timing (16 ticks)
(3) GLT Raw Output Lines (24) Timing (32 ticks)
page 2: GLT and FCT Trigger Lines
(1) Raw Trigger Line distribution
-> depends on Trigger configuration
Overlayed in red is the scaled (or FCT) Trigger
-> From Line 1 to 15 the red and black curve should
be identical. Beyond 15 are the scaled lines and
the red curve is below the black one. The last
two lines 23 and 24 are not used in the trigger
and should be at zero (they only have background-
(2) Ratio of GLT and FCT Trigger Line Distributions
The scaling factors drop out in the ratio. The
unscaled lines should be at one. For the other
lines, the scaling factors depend on the trigger
configuration, typically about 10%. With increasing
line number the suppression gets stronger.
(3) Number of GLT(!) Trigger Lines per Event
-> Events with zero GLT triggers are shown in green.
These come from 4 external trigger lines (usually
bunch-crossing or cyclic trigger)
page 3: GLT-FCT-DCT-EMT Interface Tests
-> look for red damage bits
(1) GLT Input-Output Test compares Input Phi-Maps with
GLT Output Trigger Lines.
(2) DCT-GLT Cable Errors
-> Right now there is a not understood software problem.
Ignore the bits.
(3) EMT-GLT Bit shows ROM dataflow damage.
(4) GLT-FCT Error Bit shows number of FCT triggered events
without the corresponding GLT Line set. (This should
never happen. Every FCT Line must have a GLT counterpart.)
It is ok when 1-2 Error Bits are set in histograms (1) or (3).
These come from Synch's which are a normal start of any run.
Histogram (2) contains typically thousands Error Bits and
should be ignored.
(1-10) Hit Occupancy Maps (10 superlayers)
-> look for spikes and holes
Holes may be caused by local HV problems in DCH segments.
Check first with the DCH expert the HV status of the DCH
segments in question. Superlayer 6 has a known HV problem.
Currently the whole chamber is affected by HV problems.
Spikes are usually not related to the DCH, but indicate,
due to the correlation in the trigger, a hot tower in the
EMC. Check the EMT plots on page 7 and 8 for hot EMT towers.
A structure in the Occupancy Maps reflects the angular
distribution of backgrounds, dominantly in the horizontal
page 6: PT-Discriminator/Track Linker (PTD/BLT)
(1)(2) CellNumbers with Track Segments used
as Seed for PT Discrimination
(1) in superlayer 10 and (2) in 7.
-> look for holes or spikes
(3)(4) Phi-maps of A and B tracks.
-> look for holes or spikes
(1) Output Map M: M trigger primitives sent to the GLT.
These are raw counts of the number of times the M
'fires' in each phi strip. Look for holes or very
large peaks out of proportion with the neighbouring
(2) Output Map M V time: A timing plot of (1).
The peak should be centered around tick 17. They
should all line up.
(3) Theta V Phi: This shows the distribution of hits in
the calorimeter towers. This plot is good for showing
"hot" towers. These are displayed as boxes which are
much larger than their neighbours. If this is noticed
inform the EMT expert. A white space means the tower is
(4) Same as (3) but with an energy cut of 100 MeV. Typically
hot towers come out more directly here. The difference
to the neighbour towers is more pronounced.
page 8: Calorimeter Trigger (EMT)
(1)(2)(3) Plots of Energy deposits in the EMT with a cut of
100MeV in different theta-regions of the calorimeter.
There are three polar angular regions distinguished:
Phi = everything, Y = encap, X = backward barrel.
(1) Phi - (X+Y) = central part
(2) X = backward barrel
(3) Y = forward endcap
Hot towers appear as peaks in these plots. You may
tell the trigger experts where you observed the hot
tower. You also will see holes in these distributions.
They correspond to masked out channels.
(4) Average Phi Energy per strip
page 9: Calorimeter Trigger (EMT)
(1) EMT phi energies vs time in all strips: Hot towers typically show up
as horizontal bands at unphysical energies. 1 count = 0.4 MeV
(2) EMT average Phi Energies