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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
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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