Irradiation tests of ALICE Dimuon Arm FEE

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Irradiation tests of ALICE Dimuon Arm FEE

• Workshop on Dimuon Physics in
• Ion-Ion collisions at LHC

3-8 June 2004
Christophe Suire
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Irradiation tests of ALICE Dimuon Arm FEE

• Outline Motivations
• Dimuon Arm Radiations Levels
• Tests decription
• Results and Discussion

Christophe Suire
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Motivations

• No tests have been done yet
• FEE MANAS, MARC ADC, ampli
• DAQ XILINK, DSP (not discussed in this talk)
• Now reaching the production phase
• chips/MANU start the mass production
• ? at this point, we can not go backward

We need a (post-)validation in terms of radiation
hardness of our components
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Christophe Suire
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Dimuon Arm Radiation Levels
Radiation Levels in ALICE (talk given at the
technical board 23/2/2004)
by Andreas Morsch
PMD might use the same electronics
Dimuon Arm
Focus on TC1/2 highest dose
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Christophe Suire
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Dimuon Arm Radiation Levels
no energy cut-off
Christophe Suire
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Dimuon Arm Radiation Levels

• Dimuon Arm
• - Dose 4.1 Gy 410 Rad
• - Total hadron fluence 5.1 1011cm-2
• hadrons are mostly neutrons ratio
  n/charged 100
• n-? 5.05 1011cm-2
• charged-? 0.05 1011cm-2
• (gamma-? 1/10 n-? 0.5 1011cm-2)

PMD - Dose 210 Gy 21 krad - hadron fluence
3.0 1011cm-2 (not only neutrons in this case)
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Christophe Suire
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Irradiation Tests Principle

• Ideally we should
• use gammas for Total Integrated Dose effects (410
  Rad)
• use heavy ions for Single Events Effects (?h
  5.1 1011cm-2 )

TID gradual effects, due to ionization, taking
place during the whole lifetime of the
electronics exposed in a radiation environment.
SEE very localized event induced by a single
particle (non-gradual) which generate a large
amount of charges in a small volume.
Single Event Upset Transcient and static
error Single Event Latchup Permanent
(destructive) error
Testing with 2 kinds of particles
? not really efficient (time-cost)
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Christophe Suire
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Irradiation Tests Principle

• Practically we will use protons
• generate Total Integrated Dose effects
• generate Single Events Effects (?h 5.1
  1011cm-2 )

Computational method to estimate Single Event
Upset rates in an accelerator environment
M.Huhtinen, F.Faccio ".a suitable test would
be to use 60-200 MeV proton beam to irradiate the
devices. This should provide a reasonable
estimate of the SEU rates in most locations
around LHCThe SEU cross section observed in a
medium energy proton beam should be applied to
the LHC hadron flux above 20 MeV. Or if a
conservative estimate is desired this cut could
be lowered down to 2 MeV.
? with a 2 MeV cut the hadron flux drops to ?h
5.1 1010cm-2
Proton beam facility (CPO) 50 meters from our
lab !!
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Christophe Suire
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Irradiation Tests Principle

• Dimuon Arm Radiation Level for the TC1/2 (first
  station)
• over ALICE lifetime
• 1.1 108 s of data taking (42 months) over a 10
  years period
• all collisions (pp, pA, AA) background

• Dose 4.1 Gy 410 Rad
• ?h 5.1 1010cm-2 in terms of SEU

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Christophe Suire
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Irradiation Tests

• Summary of the tests
• DUT1 4 MANAS
• pedestal and calibration run after each
  irradiation
• currents monitoring
• DUT2 1 AD Ref192 (provide Vref to the ADC)
• output voltage monitoring
• DUT3 1MARC
• pedestal run during the irradiation (dynamic
  errors)
• measure of the number of SEUs in the RAM
• current monitoring

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Christophe Suire
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Irradiation Tests
Two irradiations setup

• Irradiation 1
• DUT 1 4 MANAS on a MANU board
• DUT 2 AD Ref192 on a dedicated board
• 187.5 MeV protons
• ?p 2.0 1011cm-2
• dose 12.8 kRad

• Irradiation 2
• DUT 3 1 MARC on another MANU board
• 187.5 MeV protons
• ?p 3.6 1011cm-2
• dose 21.8 kRad
• ADC have been removed
• ? data 4095 or 0

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Christophe Suire
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Irradiation TestsSetup

• Important features
• Full remote control
• Data Acq. during irradiation
• Power Supplies Control
• Calibration runs
• Online Analysis
• Very good fluence monitoring

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Tests Results MANAS
Looking at pedestal (vs channels) evolution
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Christophe Suire
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Tests Results MANAS
Looking at noise (vs channels) evolution
Look at the distribution - mean over 64
channels - RMS
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Christophe Suire
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Tests Results MANAS
ALICE TID
PMD ??
MANAS can handle the dose foreseen for the Dimuon
Arm
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Christophe Suire
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Tests Results MANAS
Looking at gain (vs channels)

• ? send calibration
• voltages (mV)
• 0
• 150 (30 fC)
• 300 (60 fC)
• 450 (90 fC)
• 600 (120 fC)
• into MANAS built-in
• capacitors (0.2 piF)

(MANAS input range 0-500 fC)
Remarks - not linear on ¼ of the dynamic range
? 2nd order needed -
slope of 1.154 leads to a gain of 3.5 mV/fC
? fit parameters variations versus
received dose
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Christophe Suire
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Tests Results MANAS
Looking at gain (vs channels)
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Christophe Suire
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Tests Results MANAS
Gain stays constant w.r.t the received dose
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Christophe Suire
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Tests Results Ref AD192 (I)
After 460 Rad, voltage drop is -only- 7mV (3).
460 Rad deposed very fast (10 years in
ALICE) 4 days after, complete recovery (Vout
back to initial value)
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Christophe Suire
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Tests Results MARC
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Christophe Suire
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Tests Results MARC
What are we testing ?
before irradiation, a "hand-made" file has been
loaded up 555 ? 010101010101 aaa ?
101010101010 555 ? 010101010101 aaa ?
101010101010 . after each irradiation, file is
dowloaded looking for bit flips 010101010101 1010
10101010 010101110101 101010101010
output word format 12 bits of data ? only be 0 or
4095 known 4 bits for channel number
known 2 bits for MANAS number
known 11 bits for MANU address
known 2 bits free
known 1 parity bit
known The output word is
perfectly known. ? data taking during
irradiation ? look for errors in the data word
or DAQ crash "dynamic errors like"
64 words of 12 bits where are stored the
threshold values for pad selection
multiplexed output words 32 bits x 64
channels for one MANU readout
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Christophe Suire
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Tests Results MARC (I)
no dynamic errors have been seen during all
irradiation
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Christophe Suire
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Tests Results MARC (II)
of bits 64x12 728
bits 0?1 30
bits 1?0 19
Fluence
1.1 1010protons.cm-2
2.0 1010protons.cm-2
3.5 1011protons.cm-2
6.1 1010protons.cm-2
1.8 1011protons.cm-2
1.0 1011protons.cm-2
2.7 1011protons.cm-2
0
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Christophe Suire
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Tests Results MARC (II)
Something else to look at ?

• Hard to talk about structures ?
• Statistic is too low (1 MARC, 49 bit-flips)

? For specialists only
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Christophe Suire
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Conclusions
MANAS Safe in terms of TID for the Dimuon Arm
No SEE observed ? sSEU/SELlt 0.5
10-11cm2 ? pedestal values start
dropping after 1 kRad !! Ref AD192 Safe in
terms of TID for the Dimuon Arm TID effects has
been seen during test BUT they will be
negligible over ALICE lifetime. MARC Safe in
terms of TID for the Dimuon Arm 49
SEUs observed sSEU 1.37 10-10 cm-2 during
one day of data taking 21 SEUs
(/MARC RAM reloading rate) for station 1 only
54 SEUs (/MARC RAM reloading
rate) for the entire station
Present results (and more) soon available in a
ALICE Internal Note
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Christophe Suire
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More Slides
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Irradiation Tests Principle

• Practically we will use protons
• generate Total Integrated Dose effects
• generate Single Events Effects (?h 5.1
  1011cm-2 )

Computational method to estimate Single Event
Upset rates in an accelerator environment
M.Huhtinen, F.Faccio ".a suitable test would
be to use 60-200 MeV proton beam to irradiate the
devices. This should provide a reasonable
estimate of the SEU rates in most locations
around LHCThe SEU cross section observed in a
medium energy proton beam should be applied to
the LHC hadron flux above 20 MeV. Or if a
conservative estimate is desired this cut could
be lowered down to 2 MeV.
? with a 2 MeV cut the hadron flux drops to ?h
5.1 1010cm-2
Proton beam facility (CPO) 50 meters from our
lab !!
Christophe Suire
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Irradiation Tests Principle
1.6 above 20 MeV
90 below 2 MeV
8.4 between 2 MeV and 20 MeV
Christophe Suire
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Irradiation Tests MANAS
DUT 1 4 MANAS on a MANU board DUT 2 Ref AD
192
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Irradiation Tests MANAS
Currents P6 (3.3 V) 0.0997 A
constant P25 (2.5 V) 0.0576?0.0582?0.0608 A
N25 (- 2.5 V) 0.0775?0.0781?0.0802 A
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Irradiation Tests MARC
DUT 3 MARC
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Irradiation Tests MARC
Currents P6 (3.3 V) 0.0983?0.0991?0.108
A P25 (2.5 V) 0.0572 A constant N25 (- 2.5
V) 0.0762 A constant
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Dimuon Arm Readout Chain
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MARC block diagram
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FEE dynamic range
ADC 0?4095 (12 bits) from 0?2.5 V ? 10 ADC
counts 6.1 mV
Calibration voltages (via internal capacitor 0.2
piF) 150 mV in 0.2 piF ? 0.150 x 0.2 10-12
30 fC 300 mV in 0.2 piF ? 60 fC 450 mV in 0.2
piF ? 90 fC 600 mV in 0.2 piF ? 120 fC

• above a value 100 fC, the MANAS gain can not be
  
• considered linear anymore. Need a 2nd order
  correction

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Tests Results MARC
Remind that 10 years of ALICE ?h in 1.1 108sec
42 months
A rough extrapolation will lead 54 SEUs per day
for the entire Dimuon Arm.
assuming 6 hours beam lifetime ( lower rate
MARC ram reloading), a maximum of 17 channels
will have a corrupted threshold value - this
is for the whole arm -
caveat only 1 MARC tested ? sSEU value has a
large error
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