Transcript Bonding&TrackerDB - Istituto Nazionale di Fisica Nucleare

Tracker Week, CERN, 20-24 Oct 2003
Executive summary from
Bonding WG Meeting
21 Oct 2003
Salvatore Costa
INFN Catania
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Tracker Week - Module Production
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Summary of recent TIB&TOB prod
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Module Pull Tests (1)
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Module Pull Tests (2)
Firenze
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To Pd
Santa Barbara
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Module Pull Tests (3)
Firenze
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To Bari
Pd
Pisa
Santa Barbara
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Module Pull Tests (4)
Santa Barbara
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Highlights from Center Reports
AACHEN
 Just completed pilot run for TEC with 10 R6 frames. Bonded and tested the 10 frames
within two days. No problems with the P.A to sensor bondings. Had 1-2% failures (~5-8 liftoffs) during automatic bonding sensor-to-sensor. Investigating this with Hesse&Knipps.
BARI
 Got 48 Hyb in Sep. Bonded APV-PA for 11. New PAs pose no bonding problems.
CATANIA
 Both Hughes are back in operation and equipped with fresh wire, after fixing hw damage
suffered in moving from old to new Dept. Building
 Will begin bonding Test Structures, Modules after this TK Week
CERN
 “Whiskers” still a problem in Bonding APVs to Planar PA with Delvotec).It appears that K&S
8090/8060 do not have this problem. So, UCSB OK.
 FNAL has accepted to help in bonding TEC 2,5,6). Hybrid bonding at CERN is otherwise
OK. If FNAL does pick up 20% of PA-APV bonding, will need to bond about 24 hybrids per
day instead of 35/day.
PISA
 Showed Pull test results for Sensor qualification on 32 new Test Structures (16 STM and
16 Hamamatsu).
– Over 898 channels total pull tested, FBL or SBL occurs on 16 strips (1,78 %)
– An overall summary of 199 Test Structures (145 STM and 54 Hamamatsu) indicates
that over 5560 channels total pull tested, FBL or SBL occurs on 118 strips (2,12 %)
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Highlights from Center Reports

Reported on mechanical stress tests of proposed (now adopted) Hyb cable stiffener. 3 out
of 4 Modules were retrofitted with stiffener and all 4 tortured with many different types of
mechanical stress. Subsequently tested, the 3 with stiffener showed normal electric
behavior, while in the one without 6/13 lines were lost, besides exhibiting evident cracks at
optical inspection.
SANTA BARBARA
 Received first Hybrids with Planar PA's, bonded, and didn't see any of the "whiskering"
problem that Alan had found.
 Received first 6-chip hybrids and bonded 8 of them. Also bonded 5 of the 4-chip hybrids.
(All the stereo hybrids received were already bonded).
 Bonded 2 6-chip modules, 3 stereo modules.
 All modules have been fully tested with ARCS and LT system
– Both pulsed and continuous LED tests taken
– ALL of 42 strips designated in DB as bad-CAC and isolated had regular test results
(passed)
– No problem seen with these channels

Also worked (Tony) on adding stiffener to Hybrid cable test also OK.
STRASBOURG
 Working on Just received 15 modules of the ring 7.
VIENNA
 Will need to adapt jig as soon as they receive Modules with new frame
ZURICH
 Received 4 Modules which all failed test after ground bonding
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Alan’s Comments on mod to TEC modules
to avoid bond breakage
• TEC module design modified, adding a
ceramic piece to be glued between Sen & PA
spacer (and Sen-Sen). Ceramic piece and
glue joint are exactly where one wants to
support the module for bonding. Thus,
bonding jigs must be modified. Alan would
like to know how and how it works.
• TID modules may also have the same risk of
bond breakage so some solution will have to
be devised for them as well. Alan would like
to know that solution and how it works.
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Tracker Week, CERN, 20-24 Oct 2003
Which strips should the
Bonders skip
because of known Sensor defects
(a question from Bonding WG
to Sensor experts)
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Recipe for strips to leave unbonded
•
•
React only to bond immediately upstream of sensor with
bad strip
Skip (= leave unbonded)
–
All bad IDIEL (considered pinholes)
(IDIEL_1_SEN_.POSITION_OF_BAD_STRIPS)
–
All Isolated bad CAC (believed to have high chance to develop
into pinholes with irradiation)
(CAC100HZ_1_ SEN_.POSITION_OF_BAD_STRIPS)
–
All but lowest in a bad CAC chain (believed to represent shorts)
(CAC100HZ_1_ SEN_.POSITION_OF_BAD_STRIPS)
CAC Example: 3 34 35 36 37
skip isolated 3,
skip all but lowest in 34-37 chain, or: bond only 34
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Isolated bad-CAC strips
Recently questioned, because:
• They should fail the Pinhole search with Karlsruhe’s LED
system
• But some Italian Labs and UCSB have bonded them
anyways in this initial Module Prod for investigation
purposes and found no evidence of pinholes:
• >>>>>>>>>>>> LED test NEVER failed <<<<<<<<<<<<
We wanted to learn more on bad I_DIEL & bad C_AC strips
 I’ve performed a comprehensive study of the bad
strips…and…
 as a result of this study, we are no longer confident on
any part of our current rule to skip bad strips
 So we are turning to Sensor experts for guidance!
Salvatore Costa - Catania
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Bad strips study
•
In DB there are relevant data, in Tables IDIEL &
CAC100HZ, for 2427 Sensors
• For 7 Sensors, data are nonsense
 2420 Sensors are included in this study
• For each of 2420 sensors, download from DB:
1)
2)
3)
4)
I_DIEL value (in nA) for all strips
List of bad strips for I_DIEL
C_AC value (in pF) for all strips
List of bad strips for C_AC
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Bad strips study
Accounting: out of 2420 Sensors…
1. Bad-I_DIEL strips are 2898 in total (~1.2 per Sensor in average)
2. Bad-C_AC strips are 10251 in total (~4 per Sensor in average)
1. Of these, 3707 are ‘isolated’, 6544 are ‘chain’ (‘shorted’)
2. Out of the 3707 isolated bad-C_AC strips:
1. 1146 (30%) are also flagged as bad-I_IDIEL
2. 2561 (70%) are not flagged as bad-I_IDIEL
Plot Distributions of:
1. I_DIEL for good-I_DIEL strips (expect ~0)
2. I_DIEL for bad-I_DIEL strips (expect >0, but… )
3. ‘relative’ C_AC for isolated bad-C_AC strips
(expect small values, <1)
3. ‘relative’ C_AC for chain bad-C_AC strips
(expect integer multiples, 2, 3,…, but… )
4. IDIEL for isolated bad-C_AC strips which are also in bad-I_DIEL list
5. IDIEL for isolated bad-C_AC strips which are not in bad-I_DIEL list
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I_DIEL for good strips (1)
• Plotted for 869,158 strips
(approx 1700 Sensors)
• Extends to ~1mA
but peaks near 0 as
expected
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I_DIEL for good strips (2)
• Plotted for 869,158 strips
(approx 1700 Sensors)
• 857,754 (99 %) are within
1 nA
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I_DIEL for good strips (3)
• Plotted for 869,158 strips
(approx 1700 Sensors
• 742,388 (85 %) are within
0.1 nA
• ~560,000 (65%) have
I_DIEL=0.00
• There are a few negative
values
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I_DIEL for bad-IDIEL strips (1)
• 2400 Sensors
• 2898 badIDIEL strips
• (~1.2/Sensor)
• Extends to
1.2x107, but
most are much
lower
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I_DIEL for bad-IDIEL strips (2)
• 2400 Sensors
• 2898 bad-IDIEL
strips
• (~1.2/Sensor)
• 0<I_DIEL<1.2x107nA
• 1576 (54%)
1mA<I_DIEL≤1mA
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I_DIEL for bad-IDIEL strips (3)
•
•
•
•
•
2400 Sensors
2898 bad-IDIEL strips
(~1.2/Sensor)
0<I_DIEL<1.2x107nA
1576 (54%)
1mA<I_DIEL≤1mA
• 797 ( 27%)
0.1nA<I_DIEL≤1mA
• A peak at ~100 nA
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?
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I_DIEL for bad-IDIEL strips (4)
•
•
•
•
2400 Sensors
2898 bad-IDIEL strips
(~1.2/Sensor)
0<I_DIEL<1.2x107nA
– 1576 (54%)
1mA<I_DIEL≤1mA
– 797 ( 27%)
0.1nA<I_DIEL≤1mA
• 476 (16%) have ‘normal’
(=as 85% of good strips)
I_DIEL < 0.1nA !!!
 Bond or not?
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Relative C_AC for Isolated bad-CAC strips (1)
•
•
•
•
•
•
2400 Sensors
10251 bad-C_AC strips
(~4/Sensor)
3707 Isolated
(~1.5/Sensor)
Extends from
-10000< C_AC <2000
<C_AC>
but most are much lower
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Relative C_AC for Isolated bad-CAC strips (2)
• 2400 Sensors
• 3707 Isolated bad C_AC
strips
• (~1.5/Sensor)
C_AC
-10000<
<2000
<C_AC>
• 3566 (96%)
-2 < C_AC < 2
<C_AC>
• Some negative values
• Peaks at ~0 and ~0.6
 Bond or not?
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I_DIEL for Isolated bad-CAC strips (1)
• 2400 Sensors
• 3707 Isolated bad C_AC
strips
• (~1.5/Sensor)
• 1148 (30%) also in bad
I_DIEL list
• I_DIEL Distributions are
similar to the whole badI_DIEL ones in all scale
ranges (as expected)
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I_DIEL for Isolated bad-CAC strips (2)
• 2400 Sensors
• 3707 Isolated bad C_AC
strips
• (~1.5/Sensor)
• 1148 (30%) also in bad
I_DIEL list
• I_DIEL Distributions are
similar to the whole badI_DIEL ones in all scale
ranges (as expected)
 Picked in bad IDIEL list
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I_DIEL for Isolated bad-CAC strips (3)
• 2400 Sensors
• 3707 Isolated badC_AC strips
• (~1.5/Sensor)
• 2561 (70%) not in bad
I_DIEL list
• I_DIEL Distributions are
similar to the whole
good-I_DIEL ones in all
scale ranges
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I_DIEL for Isolated bad-CAC strips (4)
• Out of the 2561 not in bad
I_DIEL list:
• 2556 (~100%)
0 < I_DIEL < 1nA
• 2358 (92%) have ‘normal’
0 < I_DIEL < 0.1nA
• Only 193 (8%) have
0.1nA < I_DIEL < 1nA
(not shown)
 Bond or not?
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Relative C_AC for Chain bad-CAC strips (1)
•
•
•
•
•
•
2400 Sensors
10251 bad-C_AC strips
(~4/Sensor)
6544 Chain
(~2.7/Sensor)
Extends from
-200< C_AC <1000
<C_AC>
but most are much
lower
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Relative C_AC for Chain bad-CAC strips (2)
• 2400 Sensors
• 6544 Isolated bad C_AC
strips
• (~2.7/Sensor)
• -200< C_AC <1000
<C_AC>
• 6508 (99%)
-2 < C_AC < 8
<C_AC>
• Expected integers (2,3,4…)
Some do, but most have <1
with distrib ~ Isolated:
 Our rule that assumed
them to be all shorts might
be too naïve!
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Tracker Week - Module Production
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Relative C_AC for Chain bad-CAC strips (3)
•
•
•
•
2400 Sensors
6544 Isolated bad C_AC strips
(~2.7/Sensor)
C_AC
-200<
<1000
<C_AC>
 5889 (90%)
-2 < C_AC < 2
<C_AC>
 Neighbors, but ‘isolated’?
 619 (10%)
2< C_AC <8
<C_AC>
 There is a peak at 2.5
 Actually shorted?
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Summary & Request for guidance
1.

2.
Strips in bad-IDIEL list:
16 % do not seem to have a bad I_DIEL: bond or skip?
Isolated strips in bad-CAC list:
–
–
–
–
–

3.
We wonder if we should bond these
Chain strips in bad-CAC list:
–
–

They all seem to have bad C_AC (‘relative’ C_AC mostly <1)
30 % are also in bad-IDIEL list
70 % are not in bad-IDIEL list
92% of those not in bad-IDIEL list have indeed good I_DIEL, 8% slightly
high I_DIEL, almost none outrageously high I_DIEL
Those tested with LED pinhole search, all pass it
Only 10% of these seem to actually be shorted (‘relative’ C_AC >1)
Most (90%) behave just like the isolated ones
We wonder if we should bond or skip these or treat them in a more
sophisticated way, such as: compute relative C_AC, then


If <some threshold (1?), treat them the same way as the isolated
If > , apply the current rule for shorts i.e. bond only the 1st in chain
In all cases we ask Sensor experts for guidance
Salvatore Costa - Catania
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