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.
Check items 2
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DAC 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
Set a ladder
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You have to do all the processes very carefully.
1. Remove the top cover and bottom acrylic plate.
2. Put tubes for NOVEC.
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Silicon grease is used to put on and off them
smoothly.
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.
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Interlock
system
First of all, you have to unlock the
interlock system. Interlock system check
humidity inside test bench, 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
dew condensation on ladders.
2. After the humidity get enough low, you
start to operate the chiller and open the
valve.
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Low voltage
After all interlocks are unlocked, 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.
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Before you turn on the power supply, you have to check the output voltage set
to 0.
If the current is over 5.5A (this is a empirical value.), you have to doubt there
are some trouble.
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, you have to doubt there are some trouble.
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.
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.
They are for SPIRO board. The DAC
values for each SPIRO are stored in a
file and you can obtain from the file. For
the initial setup, the serial number of the
SPIRO are identified and the DAC
values are set automatically.
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.