Silicon Microstrip Tracker: production and performance

1
Silicon Microstrip Tracker production and
performance

• Status Report
• Flera Rizatdinova (KSU)
• for D0 SMT group
• D0 Workshop
• June 20, 2000

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Physics Requirementsto SMT

• Top physics, EW physics, Higgs physics, searches
  for physics beyond SM good performance for
  tracks with high pT in hlt3 good performance
  for jets
• B-physics good performance for tracks with low
  pT in hlt3.
• As small as possible number of dead and noisy
  channels small impact of alignment to the
  detector resolutions small inefficiency and fake
  hit rate resistance to irradiation.

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Silicon Microstrip Tracker

• 6 Barrels
• 12 F-Disks
• 4 H-Disks

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Barrel ladders
B1B6 (large z) B2-B5 (small z)
Layer 1 12 SS 12 DS_90o
Layer 2 12 DS_2o 12 DS_2o
Layer 3 24 SS 24 DS_90o
Layer 4 24 DS_2o 24 DS_2o
gt 72 SS - 144 DS_90o - 216 DS_2o
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3-chip single sided detectorsproduction status
Necessary for barrels 72 Produced
(06/11/00) 60 (AB) Graded
47 Tests/Repair
11 Need (assuming 90 yield)
13-18
Have enough sensors and High Density
Interconnetors (HDIs) to produce the rest of the
detectors.
A grade fraction F of the dead noisy
channels Flt2.5 B grade Flt5
6
3 chip SS detectors performance of (AB) graded
ladders
Good electrical characteristics Small fraction
of the dead (1.5) and noisy (0.4) channels In
82 cases, the dead channel are distributed
uniformly.
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6-chip double sided detectorsproduction status
Necessary for barrels (layer 1 layer 3)
144 Produced for layer 1
34 AB Graded for layer 1
32 Need for layer 1 (assuming 94
yield) 20 Produced for layer 3
73 AB Graded for layer 3
61 Need for layer 3
(assuming 83 yield) 54
Have enough HDIs for the rest production.
Production paced by sensor delivery (need 74
sensors more from Micron) maximum production
rate is 5/week. The total production can be
completed at the end of September. Will use some
detectors with p-stop shorts (a little bit more
noisy channels compared to detectors without this
defect).
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6-chip DS detectors performance of (AB) graded
ladders
Good electrical parameters Average random noise
on p and n-sides is small Inefficiency 0 for
strips with charge larger that ½ MIP fake hits
7 for NOISY channels 0 for good strips. But
coherent noise can have significant effect on
rate of fake hits.
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Barrel performance of layers 1 and 3
Fraction of the dead channels is 1.2 and
fraction of noisy channels is 0.4 - GOOD! Small
number of the groups of dead channels. In 85
cases uniform distribution of dead channels.
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9-chip double sided stereo detectorsproduction
status
Necessary for barrels 216 Produced
(06/19/00) 163 (AB) Graded
114 Tests/Repair
27 Need (assuming 90 yield) 90
Production is delayed by HDI delivery maximum
production rate is 10 detectors per week. In 7
weeks the total production can be completed.
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9-chip DS stereo detectors performance of (AB)
graded ladders
Good electrical parameters Average random noise
on p and n-sides is small Inefficiency due to
the readout threshold is the same as for 6-chip
DS 900 detectors 10 for strips with 1/3 MIP
charge and 0 for strips with charge larger than
½ MIP. Coherent noise can impact the fake hit
rate.
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Barrel performance of layers 2 and 4
Fraction of the dead channels is 2 on both
sides.Fraction of noisy channels is 0.6 on
p-side and 0.3 on n-side Small number of the
groups of dead channels. In 90 cases uniform
distribution of dead channels.
13
Barrel alignment
Measured Berillium edges with respect to
silicon. Precision of the individual measurement
is better than 4 mm in the ladder plane and
better than 20 mm in the perpendicular plane.
Rotation along the ladder
beam
g of 50 mm induces the error of 2 microns in
inner layers.
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Barrel alignment

• Rotation in the ladder plane

? of 10 microns induces error of 2.9 microns

• Slope of the ladder with respect to beam

beam
? of 50 microns induces error of 3.3 microns in
inner layers
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Schedule of barrel assembly
Milestone Schedule Assembled

Barrel 1 Done April 18, 2000 May 18, 2000
Barrel 2 Done May 23, 2000 June 13, 2000
Barrel 3 Started June 28, 2000
Barrel 4 July 27, 2000
Barrel 5 August 24, 2000
Barrel 6 September 22, 2000
Some problems with grounding work is in
progress.
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F-wedges production status
Necessary for disks
144 Produced (06/11/00) 110 (AB)
Graded 58 Tests/Repair
26 Need (assuming
90 yield) 60
Enough sensors on hand to build full complement
of F-disks.
Electrical characteristics of (AB) graded
F-wedges
Two groups of the detectors with low operating
voltage and high operating voltage.
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F-disks performance of (AB) graded detectors
Fraction of the dead channels on n-side is 2
times larger than on p-side, but still small
(1.4). Small fraction of the noisy channels on
both sides. In 90 cases dead channels are
distributed uniformly along detectors.
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F-disks alignment
y
2
1
f
a
b
0
x
3
Measure x and y positions of two symmetric
F-wedges using the points a and b a define the
R-positions of the detector and rotation angle f
z position of every F-wedge independently using
the points 1, 2 and 3
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F-disks alignment
No significant problems encountered with F-disk
assembly so far.
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Schedule of F-disks assembly
Milestone Schedule Assembled

F-disk 0 Done March 28, 2000 March 31, 2000
F-disk 1 Done April 11, 2000 May 10, 2000
F-disk 2 Done April 25, 2000 May 23, 2000
F-disk 3 Done May 9, 2000 June 15, 2000
F-disk 4 Started! May 23, 2000
F-disk 5 June 21, 2000
F-disk 6 July 6, 2000
F-disk 7 July 20, 2000
F-disk 8 August 3, 2000
F-disk 9 August 17, 2000
F-disk 10 August 31, 2000
F-disk 11 Sept. 15, 2000
F-disk 12 October 6, 2000
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H-wedgesproduction status
Necessary for disks
962 Produced (06/11/00) 177 AB
Graded
135 Tests/Repair
14 Need (assuming 88 yield) 65
Have enough sensors to produce the rest of the
detectors. Need more HDIs and Be. Production was
delayed by problems with encapsulation of the
detectors SOLVED! Expect to start assembling
the first H-disk at the end of June.
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H-wedges performance of detectors to be
installed in H-disks
Good electrical characteristics Small fraction
of the dead (1.3) and noisy (0.27)
channels. Small fraction of the groups of the
dead channels.
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Conclusions

• Small percentage of dead and noisy channels in
  the (AB) graded detectors.
• Low random noise in the (AB) graded detectors.
• Good alignment of the detectors in assembled
  barrels and F-disks.
• The production of the detectors for barrels will
  be finished in 10-12 weeks.
• Barrel assembly, F-disk assembly and H-disk
  assembly are less that 1 month behind the
  schedule.
• Many thanks to everybody for your continuing
  efforts (shifts on tests) !