1Domenico Di Filippo CHANTI Update and High rate effects Fabio Ambrosino, Tiziana Capussela, Michele...
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Transcript of 1Domenico Di Filippo CHANTI Update and High rate effects Fabio Ambrosino, Tiziana Capussela, Michele...
1 Domenico Di Filippo
CHANTI Update and High rate effects
Fabio Ambrosino,Tiziana Capussela,
Michele Corvino (B.Sc.),Domenico Di Filippo,
Paolo Massarotti,Marco Mirra,
Marco Napolitano,Giulio Saracino
2 Domenico Di Filippo
100% of bars to produce 6 additional stations completed We need ~1 month to finish bar characterization Station assembling will start in ~ 1 month. It will take ~1 week
per station. small vessel 90% completed in Napoli Mechanical Workshop.
Assembly & welding of the full two vessels system two expected to start in < 1 month.
The tender for the building of CHANTI front-end electronic is closed. The production has started, delivery expected mid March.
CHANTI Status
3 Domenico Di Filippo
DCS
A draft version of DCS specification for the CHANTI is ready and will be in EDMS by end of the week.
Starting the next week I will be at CERN working on the DCS software.
4 Domenico Di Filippo
We expect a mean rate of about 500 kHz on a single CHANTI bar (see Marco Mirra talk at software meeting).
In order to get an estimation of the high rate behavior of the CHANTI electronic we use BTF data taken last summer (analysis performed in Michele Corvino B.Sc. Thesis work)
High rate efficiency estimation
Flash ADC
Beam: 575 MeV e-Rate: O(Hz)Multiplicity: O(1)
Tag1 Tag25 Bar CHANTI prototype. 2 channel instrumented.
e- beam
5 Domenico Di Filippo
Emulating high rate with BTF data
Peak delay (us)
Event #
Some events present two distinct peaks (they are not particle of same burst because there are about 20 ns between them). Restricting our analysis to these kind of event we can emulate high rates
6 Domenico Di Filippo
Efficiency on the 2nd peak
Peak Delay (us)
0.924
Dead time < 60 ns. We (conservatively) estimate an inefficiency of about 2%.
1st peak revelation efficiency; it is due to acceptance.
7 Domenico Di Filippo
Tot board calibration setup
PC (Linux)
VME Bus
HP
TD
C
ArbitraryWaveformGeneratorS
igna
l spl
itter
(trigger)CAEN bus over USB
Tot Board(LVDS over HD cable)
( Thanks to Frascati and F.Gonnella for the TDC controlling software )
8 Domenico Di Filippo
Tot board calibration strategy
Trail threshold
Lead threshold
(base-Tot)*slope = Th_trail
(base-Tot)*slope = Th_lead
We first add a stable part to the signal to not stress the electronic
100 ns 100 ns147 mV
9 Domenico Di Filippo
Threshold calibration
Threshold (DAC count)
Thr
esho
ld (
mV
)Trail ThresholdLead Threshold
10 Domenico Di Filippo
Hysteresis
Threshold (DAC count)
Hys
tere
sis
Reproducibility
11 Domenico Di Filippo
Signal width dependanceThe CHANTI signal have not the flat region, so we want to check the ToT behavior in more realistic condition
There is an unexpected width behavior.
width 100 ns
Trail ThresholdLead Threshold
Thr
esho
ld (
mV
)
Width (ns)
12 Domenico Di Filippo
DC cut
Looking at the Tot 4-channel analog adder, it seem to be there a sensible DC cut.
Big (in charge) signals get a (positive) offset, so we get a wrong threshold estimation.
This could be a problem in high rate environment because the signal mean charge could sensibly differs from zero.
13 Domenico Di Filippo
DC cut effect on CHANTI
We expect a ~500kHz rate i.e. 2000 ns period.
However we use a signal with 3x the real signal charge, so it is comparable with 6000 ns with real signals.
So, this effect should be under control. More (direct) test soon...
CHANTI working point at ~6000
100 ns50 ns
Trail ThresholdLead Threshold
Period (ns)
Thr
esho
ld (
mV
)