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CLARO Requirements 30 April 2013 CERN g.pessina -1-
CLARO
Paolo Carniti INFN & University of Milano Bicocca
Lorenzo Cassina INFN & University of Milano Bicocca
Angelo Cotta Ramusino INFN and University of Ferrara
Massimiliano Fiorini INFN and University of Ferrara
Andrea Giachero INFN & University of Milano Bicocca
Claudio Gotti INFN & University of Milano Bicocca
Matteo Maino INFN & University of Milano Bicocca
Roberto Malaguti INFN and University of Ferrara
Gianluigi Pessina INFN & University of Milano Bicocca
CLARO supporters:
Marta Calvi INFN & University of Milano Bicocca
Clara Matteuzzi INFN & University of Milano Bicocca
CLARO Requirements 30 April 2013 CERN g.pessina -2-
Summary
• Requirements from the upgrade;
• Spillover;
• Cross-talk;
• CLARO vs MAROC3;
• CLARO vs NINO;
• Resources;
• Plans.
CLARO Requirements 30 April 2013 CERN g.pessina -3-
Requirements
1. Capability to work up to 25 ns bunch crossing rate with no spillover
(see next);
2. Gain tuning to the pixel spread (factor of 3 maximum);
3. Binary output with adjustable threshold;
4. Small power consumption (programmable as a function of the
occupancy, connected to 1. and se next);
5. Cross-talk threshold below 5% (see why next and Claudio talk);
6. RadHard proved up to 81013 n/cm2 (next week we will know and
see Angelo talk).
CLARO Requirements 30 April 2013 CERN g.pessina -4-
Spillover requirements (1)
From Sajan simulations the maximum occupancy is expected between
22% and 31%, but only in the central region of the detector.
CLARO Requirements 30 April 2013 CERN g.pessina -5-
Spillover requirements (2)
According to statistics the level of occupancy foreseen asks for no spillover, or
a marginal amount of it.
In addition the larger part of the detector region has a very low level of
occupancy. Therefore there the requirements of speed can be relaxed and
power consumption can be adjusted accordingly.
CLARO Requirements 30 April 2013 CERN g.pessina -6-
Spillover requirements (3)
CLARO recovery time is within 25 ns and spillover is not present at all.
Power dissipation can be set remotely (new feature) in low power mode and high
power mode.
In low power mode signal is recovered anyway 25 ns and can be applied in the
lower occupancy parts of the detector.
CLARO measured signals from a few
hundreds of PMT e- up to more than 3 Me-.
CLARO Requirements 30 April 2013 CERN g.pessina -7-
Cross-talk (1)
From the PMT characterization it
seems that triggering below 35-
40% of the single-photon peaking
falls into noise.
We face 2 scenarios.
We suppose to have single-photon hits. The photon signals extend up to about the
double of the peak. If we ask that these signals do not trigger the neighbor
channels by cross-talk they should stay within 35%, or 17% with respect to the
peak.
Add 5% of additional margin we arrive at 12% (take care: 12% is not statistical is
the fraction of charge lost in the nearby channel via stray capacitance).
But…
CLARO Requirements 30 April 2013 CERN g.pessina -8-
Cross-talk (2)
So we have to add a constraint. One possible choice is that the maximum signal
that can be lost must be less than 20%, which means that 5% is the maximum
acceptable cross-talk.
Concerning single photon only we could consider acceptable a maximum
cross-talk level of 5%, limited by 20% of signal loss.
Q(1-4)
Q
Cxt
Cxt
Cxt Cxt
Q from pixel
Q
Q
Q
The fraction of the signal, , in the nearby
channels is 4 times that of the single channel. If
we do not care about it, the risk is that neither of
the 5 channels will trigger at all. For instance,
12%4=48%>35% threshold set!
(this is true as far as the time scale of the cross-
talk signal is comparable to that of the shaping
time, example Ri=100 and Cxt=2 pF 8 ns).
CLARO Requirements 30 April 2013 CERN g.pessina -9-
Cross-talk (3)
According to Sajan simulation, an
occupancy of about 25% lead to a
probability of double hit of about 6%.
If we would like to avoid cross-talk from this situation we have to ask for a factor of
2 smaller threshold, from which subtract again 5% of margin obtaining 4% of
acceptable cross-talk.
In case of double-photon signal we could consider acceptable a maximum
cross-talk level of 4-5%, or ¼ of the threshold, whichever is smaller.
CLARO Requirements 30 April 2013 CERN g.pessina -10-
Cross-talk (4)
In summary:
So we could consider:
Maximum cross-talk: 5%
• Single photon 5% of maximum acceptable cross-talk
• Double-photon 4-5% of maximum acceptable cross-
talk
CLARO Requirements 30 April 2013 CERN g.pessina -11-
Summary of the characteristics
Power consumption in ‘low power’ mode 0.7 mW/ch a low rate, 1.9 mW/ch @ 10 MHz event rate
Power consumption in ‘timing’ mode 1.5 mW/ch at low rate, 2.3 mW/ch @ 10 MHz event rate
Power consumption Remotely settable in the new chip, hardwired settable in the present
Input noise @ Ci=3.3 pF 6 ke- RMS
Gain setting 3 bits
Threshold setting 5 bits
Programming interface SPI (addressable SPI in the new version, Angelo’s talk)
Threshold step at max gain 150 ke-
Peaking time
CLARO Requirements 30 April 2013 CERN g.pessina -12-
Competitor comparison: MAROC (1)
CLARO MAROC (*)
Power (save a factor of 5) 0.7 mW/ch 3.5 mW/ch
Input noise 6 ke- RMS 6.5 ke- RMS
Gain setting 3 bits 8 bits
Threshold setting 5 bits Common to all channels, 10 bit DAC.
Programming interface SPI (addressable SPI in the new version)
SPI standard
Threshold step at max gain 150 ke- Do not know
Pulse width (narrower pulse width, 4 to 5 times)
5 ns to 25 ns Peaking time from 20 to 25 ns for fast shaping, 100 ns to 125 ns pulse width, 30 ns to 150 ns, tunable, pulse width from 150n s to 600 ns
Crosstalk 0% on chip 0.25% on chip, slow shaper 1% on chip for fast shaper (2-3% measured on previous versions)
Rad Hard We will see next week Do not know, expected similar to the present CLARO design
Rad hard strategy Triple redundancy in the register, addressable SPI protocol which simplify the logic (see Angelo’s talk)
No strategy (as far we know)
Time over threshold Available Not Available
(*) Source of characteristics: MAROC3 datasheet
CLARO Requirements 30 April 2013 CERN g.pessina -13-
Competitor comparison: MAROC (2)
0 25 50 75 100 125 150 175 2000
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
11
Time (ns)
Arb
. U
n.
MAROC3
CLARO
Effect of shaping time on signal:
spillover B
unch
-3
Bunch
-5
Bu
nch
-4
Bu
nch
-2
Bu
nch
-1
Bu
nch
-6
Bunch
-7
CLARO Requirements 30 April 2013 CERN g.pessina -14-
Competitor comparison: NINO (1)
CLARO NINO (*)
Power (50 times smaller) 0.7 mW/ch (0.18 W per module) 35 mW/ch (9 W per module)
Input noise 6 ke- RMS 5 ke- RMS
Gain setting 3 bits Fixed
Threshold setting 5 bits Only in hd, not programmable
Programming interface SPI (addressable SPI in the new version)
Not present
Threshold step at max gain 150 ke- Do not know
Pulse width 5 ns to 25 ns Do not know
Crosstalk 0% on chip Donot know
Rad Hard We will see next week Do not know, expected a bit better to the present CLARO design (0.25 vs 0.35 CMOS)
Rad hard strategy Triple redundancy in the register, addressable SPI protocol which simplify the logic (see Angelo’s talk)
No strategy (as far we know)
Time over threshold Available Available: the output is only digital, not proportional to the input charge in amplitude, but in wildness.
Jitter 10 ps RMS, single photon 10 ps RMS, single photon.
(*) Source of characteristics: NIMA 533, 183, 2004, IEEE TNS 51, 1974, 2004.
CLARO Requirements 30 April 2013 CERN g.pessina -15-
Common attribute
CLARO, MAROC3 and NINO have all the input impedance declared between
50 and 100 .
This means that the expected level of cross-talk is expected quite similar in all
cases.
CLARO Requirements 30 April 2013 CERN g.pessina -16-
Resources
Recently MIB and FE joined some resources in this project.
In the next years we can dedicate time to both the PMT and the electronics.
In addition Genova will contribute also to both items.
We will have a meeting after tomorrow about this.
CLARO Requirements 30 April 2013 CERN g.pessina -17-
Plans
• Module prototype with the present CLARO version (80 chips on the
way, 4 PMTs and spare);
• New 8 channels CLARO (Rad Hard, gain, threshold, etc.)