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+Bias. C fb. R fb. R l. A. V 0,out. C ac. v 0. v 2. v 1. C fb. C fb. R bf. R fb. A. A. V 1,out. V 2,out. A simple detector model to describe crosstalk in segmented detectors Bart Bruyneel, IKP Köln 2006. AGATA: C ac = 1000pF C fb = 1.2pF A (Core) = 80000 A (Seg) = 10000

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R l

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  1. +Bias Cfb Rfb Rl A V0,out Cac v0 v2 v1 Cfb Cfb Rbf Rfb A A V1,out V2,out A simple detector model to describe crosstalk in segmented detectors Bart Bruyneel, IKP Köln 2006 AGATA: Cac = 1000pF Cfb = 1.2pF A (Core) = 80000 A (Seg) = 10000 (Rl = Rfb = 1G)

  2. Z00 Z22 Z11 i0 i2 i1 v0 v2 v1 Z02 Z01 Currents to electrodes: Potentials at electrodes: Z12 Small signal equivalent scheme Small crosstalk if: Seg–to –ground impedances Zii are small compared to Seg–to –Seg capacities: Zi,j = (sCij)-1 ; i≠j

  3. Z00 i0 Z22 Z11 i2 i1 Z02 Z01 Z12 A Vi V0,out Cfb Rfb Rfb A vi ii ACfb A Vi,out Cac A V0 V0,out Cfb Rfb Rfb A i0 ACfb v0 A V0,out Cac Segment-to-ground impedance Ziiand Core-to-gound impedanceZ00 Miller Equivalent Impedance In reality Zii~ (sACfb)-1 Segments Cac~ 1nF ACfb ~ 10nF Z00 ~ (sCac)-1 Core

  4. +Bias Rl Cac A V0 V0,out Rfb A i0 ACfb v0 v2 v1 A V0,out Vi Rfb A ii ACfb Segment-to-Core Core-to-Seg Segment-to-Segment Summary Since Cac << ACfb, Core-to-Segment crosstalk dominates

  5. Agata measured capacities: C0-X6 = 0.98 pF C0-X5 = 1.16 pF C0-X4 = 1.19 pF C0-X3 = 0.980 pF C0-X2 = 0.666 pF Seg. normaliz. C0-X1 = 0.943 pF Core normalization Observed shift in segments Core and Segment crosstalk

  6. “Ring 2” theory Exp. Segment sum shifts in 2-folds vs. hit pattern Theory Experiment Ring to neighbor Segment 2 Segment 2 Segment 1 D3: problem Segment 1 Seg 1 Column averages Cac 1000pF 800pF 600pF Relative shifts

  7. Relative shifts Segment Number Core shifts in singles (experimental)

  8. Conclusion • Most important crosstalk: from core to segment on the 0.16% level in reality, 0.10% explained by the model • Segment to core crosstalk: ~ 0.03% level observed 10 times bigger than predicted

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