Transcript InstructionLadderQA

Ladder QA manual
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Check items 1
Interlock
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Temperature of NOVEC.
✓
Check the difference from the value where the QA in RIKEN was
performed is less than 5℃.
Humidity inside test box.
✓
Check the difference from the value where the QA in RIKEN was
performed is less than 5%
Power supply
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Voltage and current of the power supply for SPIRO and LADDER at the
operational voltage.
✓
✓
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SPIRO: Check the difference of the current from the value of the same
SPIRO is less than 0.1A.
LADDER: Check the difference of the current from the value where the QA
in RIKEN was performed is less than 0.1A.
Bias voltage and leakage current at each 5V.
✓
Check the difference of the leakage current from the value where the QA
in RIKEN was performed is less than 0.3μA.
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Check items 2
DAC value
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SPIRO S/N
 Confirm that the SPD FEM is reading the correct S/N value
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Reference voltage. (DAC_REF_VDD, DAC_MID, and GTL_REF)
✓
Check the difference from the value of the same SPIRO is less
than 2.
Threshold value for each chip.
✓
Check the difference from the value where the QA in RIKEN
was performed is less than 10.
Mask pixel.
✓
Check there are difference from the result of the QA in RIKEN.
Hit map using β ray source.
✓
Check the difference of dead area.
Procedure of QA
Test Box Setup
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You have to do all the processes very carefully.
1. Remove the top cover and bottom acrylic plate.
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It is helpful to place across the test box to support the stave just
above it until you’re ready to lower the stave into the box. This is also
useful during disassembly.
2. Attach tubes for NOVEC.
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Silicon grease is used to put on and off them smoothly. It is
applied to the inside of the tubes.
3. Set extenders and cables for power supplies for ALICE chips and
bias voltage and for GND.
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You have to be care about the connection at connector for
data or control signals since a wrong connection cause some
wrong responses of ladders.
Applying Silicon Grease
Ladder Connector
Bias may be connected to either
3.5 V
Gnd
Bus Data Connectors
Bias Voltage input
Bus Connections
Bus data connectors
Bias
Ground
Ladder 3.5 V
Bus/ladder power connections
Ground and Ladder wires may be connected
in any position within their correct connector
Connecting Bus and ladder
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Power connections: Ladder and Ground are soldered
onto the ladder side, so they must be plugged into the
bus connection. Bias should remain connected to the
bus, and plugged in to the ladder
Data connectors are attached after power. They should
be clean of dust before connection. Use
canned/compressed air, and make sure that you are
blocking or preventing dust from blowing onto the
ladder itself. Line up the bus and ladder connectors
and when the connection is aligned, press the
connectors into place. Be Careful with this connection.
Interlock system
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Before powering the system, you must pass
the interlock system checks. Interlock system
checks humidity inside test bench, the flow
rate and temperature of NOVEC, and whether
the valve is open or not.
1. First, you have to flow N2 gas to decrease the
humidity. This has to be done before flowing
NOVEC to prevent condensation on ladders.
2. After the humidity gets low enough (0%
relative humidity), start the pump and
refrigeration, and open the valves (including
the valve on the interlock).
Interlock system
System Checks: green light indicates check passed, red light indicates check failed
Valve, Output, Humidity, Temp, Flow
Temperature reading
(here, of the NOVEC,
as no temp. sensor is
on the staff)
Valve control:
Open
Close
Interlock power
Relative Humidity:
measured
threshhold
Humidity sensor reading
Low voltage
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After all interlocks are passed, you can start to supply voltages to SPIRO board
(SPIRO), chips on ladder (LADDER), and silicon (BIAS).
First you have to supply to SPIRO, next to LADDER, and the last to BIAS.
The voltage supplied to SPIRO is 5.0V.
When you supply to LADDER, you have to turn up the voltage slowly from 0V to
3.5V. (approximately at the rate of .1V/sec)
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Before you turn on the power supply, you have to check the output voltage set to its lowest value.
As you increase the voltage the current through the ladder goes through a rapid rise around 2 V. If it
rises quickly to 5 A, pause to allow the system to equilibrate and then continue without allowing the
current to pass 5 A. You’ll notice after the system is powered up, the current will drift down over time.
When you supply to BIAS, you have to turn up the voltage slowly from 0V to 50V.
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If the current is anomalously large in comparison with the value at the test in
RIKEN, consider that there may be some problem.
There are some modules which can not operate with the bias voltage of 50V
due to large leakage current or continuous increase of leakage current. You
have to check proper operational bias voltage before supplying the voltage.
Low Voltage Setup
Right Half-Ladder
Left Half-Ladder
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Disassembly notes
In general, simply proceed through the assembly procedures in
reverse
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Gradually decrease the Ladder/Bias voltage, power down electronics.
Turn off cooling, allow the stave to come closer to room temperature
(to prevent condensation when you open the test box)
Open test box, lift out stave. Carefully disconnect the NOVEC tubes:
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Use a ~2mm or 5/64” hex (Allen) wrench to support the Stave (see
following picture)
Twisting back and forth, slowly pull off the NOVEC tube.
Using a plastic sheathed eyeglass screwdriver (as pictured) carefully pry the
bus data connection off of the ladder. Disconnect the Ladder and Ground from
the Bus, and the Bias from the Ladder.
Tilt ladder to drain remaining NOVEC.
Return stave to casing.
Disassembly Tools
Minor divisions are ~ 1mm
Novec Tube Removal
Note the position of the wrench supporting the stave
Removing Data Connector
Data acquisition
• Data are send from SPIRO board to
FEM via fiber cable and read from FEM
through USB cable.
• Ops system is used for data acquisition.
• User name and password of DAQ PC is
- User name : pixel
- Password : pixel*3186
Detail of DAQ
operation
2
1
4
3
1. Select USB mode.
2. Check the HS channels
which you are using.
3. Push “RST” button.
4. Push “GO” button.
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Set proper values for taking data at some registers.
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ADDR=0x4, 0x14, 0x24 : select the chips where FastOR signals (self trigger
signal) are accepted.
✓
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If you use readout channel of 0-3 and accept all FastOR signal from them,
you have to set 0x4, 0x14=0xff and 0x24=0x0.
ADDR=0x60, 0x61 : set the maximum trigger rate
✓
0x60=0x20 and 0x61=0x0 means the maximum rate is 20Hz
ADDR=0x62, 0x63 : set trigger mode. (external trigger mode or self trigger
mode)
✓
✓
External trigger mode : 0x62=0x0 and 0x63=0x0
Self trigger mode : 0x62=0x1 and 0x63=0x1 (Ladder QA is carried out in
self trigger mode.)
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Set DAC values (DAC_VDD, DAC_MID,
GLT_REF) of analog pilot.
Set the HS channel which you intend to
set DAC values via “HS Channel
Number” panel and set proper DAC
values via “Set Analog Pilot DACS”
panel.
The DAC values are optimized so that
the reference voltage be proper values.
✓
✓
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The proper reference voltages are
DAC_REF_VDD=1.8V,
DAC_REF_MID=0.955V,
GTL_REF=0.8V
The reference voltage can be
measured at tester adapters.
The above values are stored for each
SPIRO board in a spreadsheet. The
FEM should read off the proper S/N
automatically, but you should confirm
that the S/N matches each time you
power up the FEM.
Set trigger latency
Set threshold
values for each
chip
Set mask and test bit
Set threshold values
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Threshold values have to be optimized.
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You can this optimization by checking FastOR
signals which are triggered by noise. FastOR
signal can be checked via tester adapters.
Setting larger number means setting lower
threshold.
You can find the pixels which have to be
masked. The pixels whose threshold is higher
than the other pixel at the same chip have to
be masked.
Set mask and test bit
1. Select the chip which has the pixel you want to mask
(send test pulse).
2. Select the pixel position.
3. Set mask (test) bit.
- ALL : Set all the pixel in the chip.
- COL : Set all the pixel in the column.
- BIT : Set the pixel in the column and the row.
4. You can save and read the bit information.
1
3
4
2
Two dimensional hit
map for each chip is
shown
Take data with
external or self trigger
Take data
with force
trigger.
Convert data to EXEL
file.
Start data taking with
external of self
trigger.
DAQ rate is
shown
Stop data
taking.
Clear hit
maps.
Take data with
force trigger by
pushing this
button.
- Write file:
Write data to a file
- Graph Display
Display hit map. If you display hit map, DAQ rate decrease. It is
better not to display when you intend to store data for analysis.
Additional Pictures
Chiller
Supporting the Ladder
We used this book to support ladders coming out of and going into the test box.
Spiro connection on Bus
Bus connection on SPIRO Test Boards
SPIRO board connected
Left Ladder connection