ECAL_test_Dec_2011

INR, Moscow

Standard test bench for ECAL modules test

σ= 5.47%

RUN 00617.DAT HV 1400 VRUN 00616.DAT

HV 1350 V

σ = 6.43%

Measurements with standard electronicsMeasurements with standard electronics

…….good agreement with previous Yu.Sobolev measurements.good agreement with previous Yu.Sobolev measurements

CAEN DT574212 bit 5 GS/s

Switched Capacitor ADC

PC

Replacement standard ADC on Replacement standard ADC on CAEN DT5742

Module 8, HV 1350 V

Module 8, HV 1400 V

σσ= 6.9%= 6.9%

σσ= 5.4%= 5.4%

Practically the same results with new CAEN ADC and standard ADCPractically the same results with new CAEN ADC and standard ADC

CAEN DT574212 bit 5 GS/s

Switched Capacitor ADC

PC

Direct measurements of amplitude and charge Direct measurements of amplitude and charge of the PMT signal using of the PMT signal using CAEN DT5742

Module 8, HV 1350 V

The shape of the signal after The shape of the signal after PMT PMT EMI-9903KB

Resolution of amplitude distribution is worse Resolution of amplitude distribution is worse than charge one due to peaks on the shape than charge one due to peaks on the shape of signalof signal

CAEN DT574212 bit 5 GS/s

Switched Capacitor ADC

PC

TOFINO shaper

Measurements of amplitude Measurements of amplitude of the PMT signal using of the PMT signal using CAEN DT5742

and TOFINO shaper

Energy resolution (%) for module #8 measured by different methods

13.316.15.45.51400

9.911.5

11.1

16

16.6

6.9

7.3

6.41350

10.511.117.58.11300

10.51200

21800

TOFINO

Shaper

+CAEN ADC

Without shaper

(CAEN ADC)

ADC QDC

GSI

Shaper+CAEN ADC

GSI

Shaper

MA8000MA8000 + + ORTEC ORTEC

ADCADC

Method

HV(V)

Pavel Tlusty:Pavel Tlusty:I did similar with the Yokogawa oscilloscope, which also samples the signal. I did similar with the Yokogawa oscilloscope, which also samples the signal. What I found was that I get better resolution after shaping the signal by the MA8000 shaper. What I found was that I get better resolution after shaping the signal by the MA8000 shaper. Without the shaper, the resolution, both on ADC and QCD was about 10%. With the shaper it Without the shaper, the resolution, both on ADC and QCD was about 10%. With the shaper it was 6.5% == exactly the same as with our ORTEC ADC.was 6.5% == exactly the same as with our ORTEC ADC.

ConclusionConclusion

Measurement of energy resolution of one of the ECAL module has been done on cosmic Measurement of energy resolution of one of the ECAL module has been done on cosmic using different methods and electronics.using different methods and electronics.

Significant difference is found in resolution between direct measurements of amplitude Significant difference is found in resolution between direct measurements of amplitude and charge of the signal and resolution measured by using standard electronics with GSI shaper.and charge of the signal and resolution measured by using standard electronics with GSI shaper.

ADC resolution measured by using TOFINO shaper gives the same result as direct measurements ADC resolution measured by using TOFINO shaper gives the same result as direct measurements of QDC resolution without shaper.of QDC resolution without shaper.

These results confirms our measurements on cosmic we have done at the end of 2010.These results confirms our measurements on cosmic we have done at the end of 2010.Here we got resolution about 12% by direct measurement of charge using LeCroy QDC.Here we got resolution about 12% by direct measurement of charge using LeCroy QDC.

Unfortunately, we have not enough time to do the same measurement with HAMAMATSU PMTUnfortunately, we have not enough time to do the same measurement with HAMAMATSU PMT(from TOFINO). This is planned to do in Feb. 2012.(from TOFINO). This is planned to do in Feb. 2012.

TO DO list Feb_March_ 2012TO DO list Feb_March_ 2012

1. The same measurements on cosmic with HAMAMATSU PMT(2’’) and new 1. The same measurements on cosmic with HAMAMATSU PMT(2’’) and new PMTs frpm Laura (3’’). with standard electronics and CAEN sampling ADC.PMTs frpm Laura (3’’). with standard electronics and CAEN sampling ADC.

2. Use new electronics from Poland?2. Use new electronics from Poland?