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: requests All 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 signal signal threshold hysteresis

Modified mezzanines: test All 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 ns10 ns 50 ns10 ns

Hyst(mv) Modified mezzanines: results 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 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

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 MUX 32 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 CALIBRATION Example: CH1 of board 1 calibration with 500MΩ load Volt DAC value μAμA Set voltage calibration Read current calibration

CHANTI-FE CALIBRATION #CH Voltage Slope (Volt/DAC) Comparison of voltage-slope of board 1 channels for the two different loads (red points 1GΩ, blue points 500MΩ).

CHANTI-FE CALIBRATION Parameters distribution for voltage calibration (500MΩ load ) for all channels Volt/DAC Volt Slope parameter Constant parameter

CHANTI-FE CALIBRATION Keithley Source Voltage Current Meter MUX 32 X Board containing SiPM CHANTI- FE Keithley Current Meter MUX 32 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 CHANTI-FE CALIBRATION Black curve: current measured by CHANTI-FE Red curve: current measured by Keithley I-V curve measured in the 2) circuit μAμA Volt μAμA I-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-V curve measured in the 1) and 2) circuits CHANTI-FE CALIBRATION Volt μAμA CH1 CH17 CH20 Before correction

I-V curve measured in the 1) and 2) circuits CHANTI-FE CALIBRATION Volt μAμA CH1 CH17 CH20 After correction CH1

I-V curve measured in the 1) and 2) circuits CHANTI-FE CALIBRATION Volt μAμA CH1 CH17 CH20 After correction CH17

I-V curve measured in the 1) and 2) circuits CHANTI-FE CALIBRATION Volt μAμA CH1 CH17 CH20 After correction CH20

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