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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. Why the test in cosmics?. Two main goals:

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Cosmics test for the W-Si prototype (CALICE)

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  1. 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

  2. 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

  3. 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

  4. 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

  5. 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

  6. 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

  7. DAQ for the cosmics test bench • Veto time: ~ 100 s •  period for pad: ~ 640 s Cristina Lo Bianco - LLR

  8. 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

  9. 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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