Irradiation Test ofthe Omegapix2 Digital

TierMay 18-22, 2015, CERN

Olivier Le Dortz, LPNHE ParisJuin 2015

O. Le Dortz Réunion Omegapix2 06/2015

Omegapix2 3D ASIC

3D Global Foundries 130nm technologyMatrix of 96x24 pixels ( 2304 in total )1 Analog Tier + 1 Digital TierColumns of different transistors types (6 kinds tested)

95 191 287 383 479 575 671 1823 1919 2015 2111 2207 230394 190 286 382 478 574 670 1822 1918 2014 2110 2206 230293 189 285 381 477 573 669 1821 1917 2013 2109 2205 230192 188 284 380 476 572 668 1820 1916 2012 2108 2204 2300

... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ...

4 100 196 292 388 484 580 1732 1828 1924 2020 2116 22123 99 195 291 387 483 579 1731 1827 1923 2019 2115 22112 98 194 290 386 482 578 ... ... ... 1730 1826 1922 2018 2114 22101 97 193 289 385 481 577 1729 1825 1921 2017 2113 22090 96 192 288 384 480 576 ... ... ... 1728 1824 1920 2016 2112 2208

Col 0 Col 1 Col 2 Col 3 Col 4 Col 5 Col 6 ... ... ... Col 18 Col 19 Col 20 Col 21 Col 22 Col 23

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

O. Le Dortz Réunion Omegapix2 06/2015

from pixel n TD

InTest

SR Test In(n)= SR Test Out(n-1)

Test SR CLK

SR Test Out (n)=> SR Test In(n+1)

1

0

cmd_write (0:59)

write_data read_data

cmd_read (0:59)

60Elementary

Cellsarray

Start/StopDetection

CptEn

Clk MemRst Mem

Clk MemRst Mem

3-bitGray

Counter

cpt(2:0) n

Pixel n

Data SR CLK

Load Data SR

SR Data In(n)= SR Data Out(n-1)

SR Data Out(n)= SR Data In(n+1)

cpt(0) cpt(1) cpt(2)0

1

0

1

0

1

Adobe Acrobat Document

Trigger Sequence

O. Le Dortz Réunion Omegapix2 06/2015

Store Time

O. Le Dortz Réunion Omegapix2 06/2015

1. Injection of a pulse on each pixel input, at a specific position in the pipeline

2. Wait for a adjustable time3. Read back each pixel at the

specific position and check if the pulse is correctly read back

4. Increase the wait time until the data is not read back correctly

5. 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

Irradiation Test

O. Le Dortz Réunion Omegapix2 06/2015

Purpose: evaluate:the robustness of the circuitleakage currents, the evolution of storage time (several ms before irradiation)

Conditions:Biased + Clocked during irradiationOnline monitoring:

Configuration Shift RegistersTrigger Sequence

=> ~30 I/O to control, up to 40 MHz

Control of the ASIC consumed currentDoses

Protons 2.5x1015 p.cm2 minimum

CERN Irradiation Site

O. Le Dortz Réunion Omegapix2 06/2015

• CERN-PS East Hallhttps://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

Acquisition Setup

O. Le Dortz Réunion Omegapix2 06/2015

Driver BoardFPGA+Interface

2 flat cables => IRRAD 9

220V CH1 Ethernet Cable

ETHERNET~10 m Monitoring PC with

LabVIEW software+

Power Supply for IRRAD Board

ZONE 2 (IRRAD 9)

Beam

ASIC Logic& I/O

Irradiated BoardOMEGAPIX2_IRRAD

ZONE 4

~7m

~30 I/O+ Alim

COUNTING ROOM

Patch Panels

2m 2m

Proton Facility, PS East Hall (building 157)

FPGA Board220V Plug accessiblePower Supply =>

Control Room

Supervised Area

O. Le Dortz Réunion Omegapix2 06/2015

ETH & 220V Counting

Room

FPGA Kit

2x40 pairs flat cables10 meters long

Irrad Board~7V Power Counting

Room

ETH PC220V Plug

Irrad Power

Zone 2 (Proton Beam)

O. Le Dortz Réunion Omegapix2 06/2015

2 cables plats 40 points

Alim

Zone 4

Irradiated Board

O. Le Dortz Réunion Omegapix2 06/2015

Beam center

Chip insidepackage5x5 mm2

Not mounted

VoltageRegs1.5 and 3.3V

6V+ to PP

2 flat cablesto ZONE 4

LVDS SerialTransceivers

Levelconvertors1.5V3.3V

Not mounted

ASICQFP160 pin

package

Holesto supportframe

Support de carte

O. Le Dortz Réunion Omegapix2 3/03/2015

Support multi-carte du site

Axe du faisceau

Support LPNHE

Carte irradiée

FPGA Board on Zone 4

O. Le Dortz Réunion Omegapix2 06/2015

Altera Nios II Stratix II Evaluation Board

Ethernet 10/100(to Counting Room)

FPGAStratix2S60

2 Expansion connectors41 I/O each

RAM DDR32 MB

ROM Flash16 MB

Flat Cables toZone 2

PowerSupply

OMEGAPIX2_SANTACRUZ

Irradiation Run Summary

From Monday 18th to Thursday 21st, total fluence of ~2.1E15 p/cm²During all the irradiation period, good functioning of the Configuration Shift RegistersDuring the first hours of irradiation, continuous increase of the consumed current (until saturation)Strong reduction of the storage time when the beam was onWhen 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 irradiation up to ~3.0E15 p/cm².But after the beam was off, unable to access the FPGA board

O. Le Dortz Réunion Omegapix2 06/2015

Conclusion

To do list:Get the effective fluence figures from Irrad groupEvolution of storage time wrt total fluence

Mean value per pixelHistogram 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 consumptionNo ground planes on the beam position (huge activation of the copper plane after several hours > 1mSv/h)FPGA board protection ?O. Le Dortz Réunion Omegapix2 06/2015