Transcript Analysis of cosmic/self-triggerd data of station 5 Hideyuki Sakamoto MICE Tracker Phone Meeting 20th April 2007 20 April 2007 MICE Tracker Phone Meeting.

Analysis of cosmic/self-triggerd data of
station 5
Hideyuki Sakamoto
MICE Tracker Phone Meeting
20th April 2007
20 April 2007
MICE Tracker Phone Meeting
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Contents
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Dead channel study by LED calibration run
Overview for the mapping problem.
PE distribution at each view
PE correlation plot between each view
Summary
Next step
• Caution: plot :
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Dead channel study
• LED calibration data:
– http://mice.iit.edu/scratch/20070322/cass105_nombias_ledoff.2.ro
ot
• Check the channel is alive or dead by eye.
– Alive: can see peaks
– Dead: cannot see peak or difficult to separate each peak.
• Check almost of channel.
– All channel for LHB
– MCM#1-#2 for RHB
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Sample: Alive and Dead channel
Alive
Dead
Common feature on dead channels:
• Pedestal is large and 1 p.e. is much smaller and more p.e. cannot see peaks.
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List of dead channels
• LHB
• RHB
– MCM#1: #29-#32
– MCM#2: #29-#32
– MCM#3: #22,#27,#29#32,#35,#37,#44
– MCM#4: #29-#32
– MCM#5: #29-#32
– MCM#6: #29-#32
– MCM#7: #29-#32
– MCM#8: #29-#32
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MCM#1: #23-#64
MCM#2: #29,#33-#36
MCM#3: under checking
MCM#4: under checking
MCM#5: under checking
MCM#6: under checking
MCM#7: under checking
MCM#8: under checking
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PE correlation between each view
TOP: Before modifying the code
Bottom: After modifying the code
Pe @W
C
B
0
A
D
Pe @X
A: detected correctly
B: did not hit for both
C/D: one has hit another did not.
C/D region is still too much…
This did not solve the problem…
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PE distribution at each view
TOP: Before modifying the code
Bottom: After modifying the cod
Amount of pedestal
The plot is created using a hit of max. p.e. at each view.
Not summation of all fibers at each view.
So, if it is assumed that muon is surely passing through station,
Then, it corresponds to hit efficiency.
But for now, of course we cannot estimate it by using wrong mapping.
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PE distribution at each view (cnt’d)
The reason is very easy to understand.
Please image that some event has 3hits at each views, A, B, C.
If the mapping between views is wrong, then max. light yield channel
is selected among the rest of pedestal.
A
B
C
Correct mapping
Wrong mapping
X view – 98ch
X view – 98ch
V view – 100ch
X view – 90ch
V view – 100ch
W view – 102ch
W view -103ch
This is Pedestal
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Mistake between view?
Back plane side
#1
Waveguide #1
#2
#3
Waveguide #2
#4
Waveguide #3
#5
#6
#7
Waveguide #4
#8
Waveguide #5
L
H
B
• From the slide#3, we can see
mapping error between views.
• Each view are (almost) separated by
V view
the D0 connector (#1-#8)
• So, the mistake between views
corresponds to the mistake between
X view MCMs.
• It suggests that mapping error is
happened at the electrical part, Inside
W view of AFE or outside of AFE.
R
H
B
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Plotting Maximum light yield within
all channels on the cassette.
• Final? way for now to checking the signal is seeing the
channel of maximum light yield in the cassette. Before
selection by view.
• If only the mapping is wrong within the MCM modules,
then we can see the signal by this plot anyway.
– Cannot separate by view, of course. Just watching signal itself.
– For this plot, only one fiber of maximum among 3 hits at each
view is selected.
#7
#6
#5
#3
#2
#1
#4
160
200
#8
RHB
150
LHB, MCM#3 is selected.
LHB
ADC
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Before showing PE plot…
This is one of the most strange plots
Back plane side
#1
MCM plot
Waveguide #1
#2
V view
#3
Waveguide #2
#4
Waveguide #3
#5
LHB
MCM
X view
#6
L
H
B
In the rule of the readout scheme, MCM# is starting from left side
from the front view. This means that MCM# on RHB should be
#1, #2, #5,#6,#8. But the result shows the same as LHB.
RHB Problem..
#7
Waveguide #4
#8
Waveguide #5
R
H
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W view
MCM
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PE distribution
LHB
Pedestal
ratio
Saturated
ratio
Signal
ratio
RHB
What is this?
If 100% triggering efficiency is assumed, then hit efficiency is roughly estimated by 85% at RHB.
I think small efficiency at RHB is due to timing setup, if RHB is correct within the MCMs.
For LHB, there has still problem….
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Present status – in my mind
• Mapping problem should have fixed.
• Yesterday, Malcolm sent email back to Ken, which says
that the setup for the external trigger was wrong on the
RHB.
• If it is correct, then strange phenomena shown at slide
#8&#9 is due to this!
• So, we can see correct-decoded data at the next.
– Coming soon?
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Summary
• Mapping problem should have been fixed
and waiting for new samples.
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Next step
• Check light yield and fiber crossing.
• We can check the all fiber’s output.
• Timing problem is also argued after
mapping is fixed.
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