Download Irradiation Test

Irradiation Test of
the Omegapix2 Digital Tier
May 18-22, 2015, CERN
Olivier Le Dortz, LPNHE Paris
Juin 2015
Omegapix2 3D ASIC
3D Global Foundries 130nm technology
Matrix of 96x24 pixels ( 2304 in total )
1 Analog Tier + 1 Digital Tier
Columns of different transistors types (6 kinds tested)
95
94
93
92
191
190
189
188
287
286
285
284
383
382
381
380
479
478
477
476
575
574
573
572
671
670
669
668
...
...
...
...
...
...
...
4
3
2
1
0
Col 0
100
99
98
97
96
Col 1
196
195
194
193
192
Col 2
292
291
290
289
288
Col 3
388
387
386
385
384
Col 4
484
483
482
481
480
Col 5
580
579
578
577
576
Col 6
O. Le Dortz
...
...
...
...
...
...
...
...
...
...
...
...
1823
1822
1821
1820
1919
1918
1917
1916
2015
2014
2013
2012
2111
2110
2109
2108
2207
2206
2205
2204
2303
2302
2301
2300
...
...
...
...
...
...
1732
1828
1924
2020
2116
2212
1731
1827
1923
2019
2115
2211
1730
1826
1922
2018
2114
2210
1729
1825
1921
2017
2113
2209
1728
1824
1920
2016
2112
2208
Col 18 Col 19 Col 20 Col 21 Col 22 Col 23
Réunion Omegapix2
06/2015
Configuration Shift Registers
The parameters and results of each pixel of the analog
and digital tiers are accessible via 5 shift registers
(Analog Tier) Slow Control
(Analog Tier) Analog Tier Probe
(Digital Tier)
Test input
(Digital Tier)
Digital Tier Probe
(Digital Tier)
Digital Data Readout
O. Le Dortz
Réunion Omegapix2
06/2015
Digital Tier Elementary Cell
Pixel n
SR Test Out (n)
=> SR Test In(n+1)
SR Test In(n)
= SR Test Out(n-1)
Clk Mem
Rst Mem
Test SR CLK
write_data
InTest
Clk Mem
Rst Mem
read_data
1
CptEn
0
3-bit
Gray
Counter
Start/Stop
Detection
from pixel n TD
60
Elementary
Cells
array
cmd_write (0:59)
cpt(2:0) n
cmd_read (0:59)
Load Data SR
SR Data In(n)
= SR Data Out(n-1)
cpt(0)
cpt(1)
cpt(2)
0
0
0
1
1
1
SR Data Out(n)
= SR Data In(n+1)
Data SR CLK
O. Le Dortz
Réunion Omegapix2
06/2015
Trigger Sequence
O. Le Dortz
Réunion Omegapix2
06/2015
Store Time
1.
2.
3.
4.
5.
Injection of a pulse on each
pixel input, at a specific
position in the pipeline
Wait for a adjustable time
Read back each pixel at the
specific position and check if
the pulse is correctly read back
Increase the wait time until the
data is not read back correctly
Display the maximum wait time
with correct read back
 Before irradiation, the data
remain valid on the cell from 5ms
to 25ms, depending on the
transistor technology parameter
O. Le Dortz
Réunion Omegapix2
06/2015
Irradiation Test
Purpose: evaluate:
the robustness of the circuit
leakage currents, the evolution of storage time (several ms before
irradiation)
Conditions:
Biased + Clocked during irradiation
Online monitoring:
Configuration Shift Registers
Trigger Sequence
=> ~30 I/O to control, up to 40 MHz
Control of the ASIC consumed current
Doses
Protons 2.5x1015 p.cm2 minimum
O. Le Dortz
Réunion Omegapix2
06/2015
CERN Irradiation Site
•
•
•
•
CERN-PS East Hall
https://ps-irrad.web.cern.ch/ps-irrad/
24 GeV Proton beam, 12mmx12mm FWHM (ASIC= 5x5 mm²)
Installation on Monday
“Continuous” irradiation until Thursday. Integrated fluence=> 3,5.1015
protons/cm2
O. Le Dortz
Réunion Omegapix2
06/2015
Acquisition Setup
Proton Facility, PS East Hall (building 157)
ZONE 2 (IRRAD 9)
ZONE 4
COUNTING ROOM
Supervised Area
Beam
ETHERNET
~10 m
ASIC
Logic
& I/O
~30 I/O
+ Alim
Irradiated Board
OMEGAPIX2_IRRAD
Driver Board
FPGA+Interface
2 flat cables => IRRAD 9
220V CH
1 Ethernet Cable
Power Supply =>
Control Room
2m
O. Le Dortz
~7m
Monitoring PC with
LabVIEW software
+
Power Supply for
IRRAD Board
FPGA Board
220V Plug
accessible
Patch Panels
2m
Réunion Omegapix2
06/2015
ETH  PC
220V Plug
Irrad Power
Irrad Board
~7V Power
 Counting
Room
ETH & 220V
 Counting
Room
FPGA Kit
2x40 pairs flat cables
10 meters long
O. Le Dortz
Réunion Omegapix2
06/2015
Zone 2 (Proton Beam)
2 cables plats 40 points  Zone 4
Alim
O. Le Dortz
Réunion Omegapix2
06/2015
Irradiated Board
6V+ to PP
Chip inside
package
5x5 mm2
Not mounted
Voltage
Regs
1.5 and 3.3V
ASIC
QFP160 pin
package
LVDS Serial
Transceivers
Level
convertors
1.5V3.3V
2 flat cables
to ZONE 4
Holes
to support
frame
Not mounted
Beam center
O. Le Dortz
Réunion Omegapix2
06/2015
Support de carte
Carte irradiée
Support multi-carte
du site
Support LPNHE
O. Le Dortz Réunion Omegapix2
3/03/2015
FPGA Board on Zone 4
Altera Nios II Stratix II Evaluation Board
Ethernet 10/100
(to Counting Room)
Power
Supply
2 Expansion connectors
41 I/O each
ROM Flash
16 MB
FPGA
Stratix2S60
RAM DDR
32 MB
Flat Cables to
Zone 2
O. Le Dortz
Réunion Omegapix2
OMEGAPIX2_SANTACRUZ
06/2015
Irradiation Run Summary
From Monday 18th to Thursday 21st, total fluence of
~2.1E15 p/cm²
During all the irradiation period, good functioning of the
Configuration Shift Registers
During the first hours of irradiation, continuous increase
of the consumed current (until saturation)
Strong reduction of the storage time when the beam was
on
When the board was put in park position or when the
beam was off, could partially recover a functional
operation of the pixel logic. But storage time reduced by
factor > 10 ( less then 1 ms )
FPGA board: sensitive to radiation, even though in a
“protected” area. Internet connection unstable. Had to
restart the board frequently when the beam was on (not
when off).
From Thurday evening to Friday morning: additional
O.irradiation
Le Dortz
Omegapix2
06/2015
up to ~3.0E15Réunion
p/cm².
Conclusion
To do list:
Get the effective fluence figures from Irrad group
Evolution of storage time wrt total fluence
Mean value per pixel
Histogram for each cell type...
Check back, at CERN, if the FPGA board can be
recovered/reprogrammed, in order to perform tests
after the full dose (a spare FPGA board can also be
used in case of full failure).
What could have been improved:
Automatic online monitoring of the power
consumption
No ground planes on the beam position (huge
activation of the copper plane after several hours >
1mSv/h)
O. Le Dortz
Omegapix2
06/2015
FPGA board protectionRéunion
?