CHANTI update

CHANTI update

F. Ambrosino, T. Capussela, D. Di Filippo, P. Massarotti, M. Mirra, M. Napolitano, L. Roscilli, G. Saracino

Outlook

• Construction & installation• CHANTI-FE boards calibration and tests• ToT boards calibration and tests• Progress on DCS• Commissioning schedule• To do list• Conclusions

Construction

• All of the six stations have been fully assembled and cabled

• All of the 300 SiPMs have been tested for funtionality. A subset (25%) tested at diferent temperatures to compare temperature behaviour wrt Hamamatsu specs

• All of the connections with SiPMs and Pt100 probes checked before assembly

Construction (2)

Construction (3)

Construction (4)

Installation

• CHANTI stations aligned in Napoli to +- 0,5 mm. The last CHANTI station has adjustable feet to this aim.

• Check of alignment re-done at CERN after transportation.

• Installation on the beam line and survey successful.

Installation (2)

Installation (3)

Small problem with the o-ring prevented us to complete the cabling and install the signal flanges. This will be done during the September 15th week.

CHANTI ToT boards: requestsAll the TOT mezzanines for the CHANTI have been modified in order to obtain

• G = 2• Hysteresis of the order of 5 mV• Hysteresis corresponding to a lower threshold on the rising

edge of the signalsignal

threshold hysteresis

Modified mezzanines: testAll the 160 CHANTI mezzanines, corresponding to 640 channels, have been tested.ToT is evaluated with two different pulses, (mirror pulses), as a function of the threshold.

In this way the value of the hysteresis and the threshold calibration parameters can be obtained.

50 ns 10 ns

10 ns

50 ns10 ns

10 ns

Hyst(mv)

Modified mezzanines: resultsAll the 160 CHANTI-TOT mezzanines, corresponding to 640 channels, have been tested and only 7 of them are not good (already sent to the Artel for repair). We have however enough good channels for the full CHANTI instrumentation.

The hysteresis is in agreement with the requests

Slope(mV/DAC)x10-1

All the 160 CHANTI-TOT mezzanines, corresponding to 640 channels, have been tested and only 7 of them are not good (already sent to the Artel for repair). We have however enough good channels for the full CHANTI instrumentation.

The slope distribution is about 0,15 mV/DAC (as expected for G=2)

Modified mezzanines: results

Modified mezzanines: results

Offset(mV)

All the 160 CHANTI-TOT mezzanines, corresponding to 640 channels, have been tested and only 7 of them are not good (already sent to the Artel for repair). We have however enough good channels for the full CHANTI instrumentation.

The average offset is 8 mV

CHANTI-FE CALIBRATION

MUX32 X

CHANTI-FE

Keithley picoAmperometer

Calibrated high impedence resistor

Semi-automatic DAC calibration system developed in Napoli. The procedure needs a picoAmperometer and a calibrated high resistence in order to calibrate both the DAC voltage value (read and set by CHANTI-FE) and the DAC current value (read by CHANTI-FE).

Single-channel calibration for 9 CHANTI-FE boards has been performed at CERN in July. Two values for the resistive loads have beed used (1GΩ and 500MΩ).

DAC value

CHANTI-FE CALIBRATIONExample: CH1 of board 1 calibration with 500MΩ load

Volt

DAC valueμA

Set voltage calibration

Read current calibration


#CH

Volta

ge S

lope

(Vol

t/DA

C)

Comparison of voltage-slope of board 1 channels for the two different loads (red points 1GΩ, blue points 500MΩ).

CHANTI-FE CALIBRATIONParameters distribution for voltage calibration (500MΩ load ) for all channels

Volt/DAC

Volt

Slope parameter

Constant parameter


Keithley Source VoltageCurrent Meter

MUX

32 XBoard containing SiPM

CHANTI-FE

Keithley Current Meter

MUX32 X

Board containing SiPM

Testing calibration procedure: measure I-V curves of SiPMs with two different approaches:

1) Keithley used to apply voltage and measure current

2) Keithley used to measure current; CHANTI-FE apply voltage and measure current

Volt


Black curve: current measured by CHANTI-FE

Red curve: current measured by Keithley

I-V curve measured in the 2) circuit μA

Volt

μAI-V curve measured in the 1) and 2) circuits

Blue curve: current measured by CHANTI-FE in 1)

Red curve: current measured by Keithley in 2)

𝐼 1=𝐺(𝑉 𝑡𝑟𝑢𝑒❑ −𝑉 𝑏𝑑

❑ )2

𝐼 2=𝐺(𝑉 𝑡𝑟𝑢𝑒❑ (1−𝑥)−𝑉 𝑏𝑑

❑ )2

I-V curve measured in the 1) and 2) circuits


= systematic effect due to resistance used in the calibration procedure. Expected at level 0,1% (quoted ± 0,07% by manufacturer)

Volt

μA𝑥 correction evaluated

point by point in I-V curves for three different channels. Residual V dependence due to the fact that I-V curve is not really quadratic. CH1 CH17

CH20

Before correction


❑ )2


❑ )2




Volt



CH20

After correction CH1


❑ )2


❑ )2




Volt



CH20



❑ )2


❑ )2




Volt



CH20


CHANTI-FE DCS

CHANTI-FE DCS

CHANTI-FE DCS

Commissioning schedule

• Signal flanges not mounted yet (missing orings) • Internal cabling completed and tested (all of

SiPMs look fine)• External cabling and finally commissioning will

start in the week of September 15th and will likely last till the beginning of the Run.

• However all of the parts of the system have already been tested individually.

To do list

• Upgrade of digitization and reconstruction on MC (deadline: few months ago actually…but not enough manpower up to now)

• Raw data definition and L1/L2 sw (deadline: end of September)

• Completion of DCS and inclusion in general framework (deadline: November)

Conclusions

• The CHANTI is installed and (almost) ready to take data !!!

January 2009

Documents

CHANTI update