Grounding and Testing L0 (L1) --- noise studies ---

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Grounding and Testing L0 (L1) --- noise studies ---. Introduction of noise issue What is going on the other side of the ring (CDF). Noise studies using L0 prototypes Results for the L1 prototype module Grounding studies (done by Marvin, Breese, Mike M) Plan Conclusions. - PowerPoint PPT Presentation

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  • Grounding and Testing L0 (L1)--- noise studies ---Kazu Hanagaki, Sara Lager, Gustavo Otero Introduction of noise issue What is going on the other side of the ring (CDF). Noise studies using L0 prototypes Results for the L1 prototype module Grounding studies (done by Marvin, Breese, Mike M) Plan Conclusions

  • Introduction of Noise issues for L0Goal: S/N>10 after 15(6.5-11?) fb-1.Internal contribution: capacitive load by the long analog flex cable.External contribution: RF pickup, capacitive coupling unfortunately the analog cable works as antenna.A few slides to show the current CDF situation.

  • Noise in terms of Capacitive LoadS/N=10CSiCcableS/N=10 after 15fb-1 Ccable < 23pF for 43.5cm long cableTotal noise estimates VS total capacitance (Csi + Ccable) Ccable < 0.53pF/cm

  • Lesson from CDF (Pickup on Signal Cables)Noise picked up by analog signal cablesEffects are seen at edges of cables, within one sensorBoth coherent and incoherent sourcesNoise shapes Pedestal shiftsSignal CablesNarrow SensorsWide SensorsHybrids

  • Lesson from CDF (Study of Pickup)L00 module in a well-grounded faraday cageInsert a noise source (waveform generator)Vary amplitude, frequency, geometry, grounding, shielding, state of SVX3D chips when acquiring, etc.Conclusions:Cables are the antennaeCables shield one anotherPickup increases with frequencyLarge pickup in some dead-timeless operations, but common-modeHybrid electronics cables couple to signal cables, depending on geometryCoherent pickup from in-time signalsIncreased noise due to increased capacitance seen by front-end electronicsProperly grounded shield eliminates problem

  • Lesson from CDF (Correlations in Data)CDF data exhibits patterns consistent with bench studiesLocation in cable stack importantWide modules with cables in the middle of stack have least pickupNoise from above & below Narrow modules chips with innermost cable have least pickupNoise source is aboveBeam-pipe, C-fiber support not source of noise Less pickup on west than eastShield grounded on westHas other structures not yet understood

    Chart2

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    Inner

    Middle

    Outer

    Arbitary Units

    Pickup

    Location in Cable Stack (Narrows)

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    adc_1

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    chip1

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    adc_rms_1

    adc_rms_2

    chip2

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    noise_1

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    cooling

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    pickup_rms_1

    pickup_rms_2

    west

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