Cosmics test for the w si prototype calice
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Cosmics test for the W-Si prototype (CALICE). All active detector “slabs” will be individually tested in cosmics before being slided into the Ecal Prototype. Why the test in cosmics? The cosmics test-bench DAQ for the cosmics test-bench. Why the test in cosmics?. Two main goals:

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Cosmics test for the W-Si prototype (CALICE)

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Cosmics test for the w si prototype calice

Cosmics test for the W-Si prototype (CALICE)

All active detector “slabs” will be individually tested in cosmics before being slided into the Ecal Prototype

  • Why the test in cosmics?

  • The cosmics test-bench

  • DAQ for the cosmics test-bench

Cristina Lo Bianco - LLR


Why the test in cosmics

Why the test in cosmics?

Two main goals:

  • To verify the assembling of the slab

  • To intercalibrate the Si wafers in order to take into account the difference in thickness from wafer to wafer

In addition, the cosmics test-bench will be used by U.K people for testing the DAQ for the prototype.

Cristina Lo Bianco - LLR


Why the test in cosmics check of the assembling

Why the test in cosmics?Check of the assembling

It will be possible to :

  • estimate the electronics gain and noise and perform a calibration for each pad

  • obtain a rough extimation of cross correlation between pads

  • verify the electric contact between the Si wafer and the PCB (conductive glue)

  • discover and mend everything that could possibly go wrong

Cristina Lo Bianco - LLR


Why the test in cosmics intercalibration of the si wafers

Why the test in cosmics?Intercalibration of the Si Wafers

  • The thickness of the Si wafers is given by the producer with a 3% tolerance, which propagates in a 3% uncertainity on the energy resolution

  • Testing in cosmics for approximately 450 hours (18.6 “full days”) it will be possible to achieve, for all the wafers, a intercalibration at 0.3 % precision

Cristina Lo Bianco - LLR


The cosmics test bench

The cosmics test-bench

  • Typical value for muons flux at sea level (PDG): 80 m-2 s-1 sr-1

  • Estimated flux per wafer: 0.056 muons s-1


The cosmics test bench1

The cosmics test-bench

  • Typical value for muons flux at sea level (PDG): 80 m-2 s-1 sr-1

  • Extimated flux per wafer: 0.056 muons s-1

Aluminum foil : ~0.1 mm

PCB : 2.4 mm

Wafer : 0.525 mm

8,3 mm

Carbon fiber : 0.15 mm

W plate : 1.4 mm


Daq for the cosmics test bench

DAQ for the cosmics test bench

  • Veto time: ~ 100 s

  •  period for pad: ~ 640 s

Cristina Lo Bianco - LLR


Present status of the test bench

Present status of the test-bench

Everything is in the lab and ready for assembling:

  • scintillator planes exist

  • electronics exists

  • we have one PCB (type1) with two chips from LAL for preliminary tests

    What is left to do:

  • connecting all the electronics (one month)

  • developing the software for the data acquisition and analysis

Cristina Lo Bianco - LLR


Conclusion

Conclusion

  • The cosmics test-bench will be ready for first measurements at the end of June (a student will work on the assembling in April-May-June)

  • July-August will be devoted to preliminary tests with the type1 PCB

  • Measurements of final PCBs will start in January and last approximately 2 months (for a 0.3% precision)

Cristina Lo Bianco - LLR


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