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SiPM for MEG2

SiPM for MEG2. On behalf of the italianTC group Fukuoka 23 Oct 2013. Current TC time resolution Intrinsic TC resolution at BTF is ~40 ps In MEG degradation due to B and to large dynamic range 40 ps → 50 ps expected Additional degradation due

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SiPM for MEG2

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  1. SiPM for MEG2 On behalf of the italianTC group Fukuoka 23 Oct 2013

  2. Current TC time resolution Intrinsic TC resolution at BTF is ~40 ps In MEG degradation due to B and to large dynamic range 40 ps → 50 ps expected Additional degradation due to DRS (DrS(t) ~30-50ps) → 60 ps (measured with triple, 65 ps is an overestimation)

  3. Current teresolution Dominant contribution from t (TC+DRS) = (BTF)(1+ (MEG))+ (DRS) = 40x(1 + 0.25) + 40 = 60 ps (BTF)intrinsec (from BTF) (MEG) relative degradation due to B (low G), large signal dynamic range (DRS) due to DRS

  4. Upgrade TC time resolution Resolution s(tTC) = 30 (33) ps measured MEG Additional error (B, extra dynamic range): 1.1 Reduced DRS error: 25 ps Calibration: 30 ps(???)

  5. Upgrade teresolution MEG MEG2(my) MEG2(proposal) Intrinsec 40 ps → 30 ps 35 ps MEG factor 0.25 0.1 DRS 40 ps 25 ps TC calib 40 ps 30 ps Le/c 75 ps 35 ps 11 ps --------------------------------------------------- te107 ps63 ps 37 ps t 67 ps → 64 ps 76 ps ---------------------------------------------------- te 122 ps90 ps84 ps

  6. tein alternative scenarios • tTC intrinsic = 20 ps -> te = 87 ps • tTC intrinsic = 30 ps -> te = 90 ps (Hamamatsu) • tTC intrinsic = 33 ps -> te = 91 ps (AdvanSId) • tTC intrinsic = 40 ps -> te = 93 ps • s(calibration) = 30ps • The change are tiny. • Limit on->e scales linearly with resolution • But 1 more week/y per extra calibration or commissioning would waste a 3% gain

  7. Calibration and (te Relative calibration between TC counter (and with XEC) can strongly influence (te) Stability of the SiPM is of important In particular the thermal coefficients dV/dT should be as small as possible That is a relevant parameter for devices with comparable s(tTC) dV/dT = 50 mV/oC for (Hamamatsu) dV/dT = 25 mV/oC for (AdvanSid)

  8. Conclusion Hamamatsu and AdvanSid are equivalent from the point of view of the effect on tetime resolution AdvanSid offers better performance from the point of view of stability that may allow precise calibration AdvanSid is our preferred choice for MEG2

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