On the origin of Differential Crosstalk in segmented detectors B. Bruyneel for the AGATA week, Uppsala, Sweden July 2008.

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Presentation transcript:

On the origin of Differential Crosstalk in segmented detectors B. Bruyneel for the AGATA week, Uppsala, Sweden July 2008

Crosstalk is present in any segmented detector Influences energy: Creates strong energy shifts proportional to fold Influences PSA: Crosstalk mixes with transient signals Fast and accurate crosstalk detection and energy correction methods developed To Do : Crosstalk measurement and correction in PSA Sum of segment Energies vs fold Cross talk analysis: Motivation Xtalk signal:

Crosstalk in all its forms PA V 0,out V 1,out PA Z in Z 01 Xtalk ~ Z in / Z 01 Proportional Xtalk model : Z in = Miller = 1/sAC fb But: Miller does not explain risetime of preamplifier…! Proportional Xtalk (50  s decay)  Energy Differential Xtalk (only during risetime)  PSA Pure Xtalk signal:

Preamp model describing risetime V out /I in = Z fb Z in = V in /I in Z in = Z fb /A + R cold “ Cold Resistor ” : - E. Gatti and P. Manfredi – Il Nuovo Cimento vol. 9 serie 3 (1986) - “Analogue circuits techniques Part II ” F. Anghinolfi, CERN (2002) – (available online) PA V out V in I in

Xtalk extension PA V 0,out V 1,out PA Z in Z 01 With Z in = 1/sAC fb + R cold Xtalk ~ Z in / Z 01 = C 01 /AC fb + s. R cold C 01 Proportional + Differential Xtalk Example : R cold = 1k  ; C 01 = 10pF Differential Xtalk = 1000%ns Warning: Other ways possible to create Derivative Xtalk !

Realistic simulation (Multisim) PA V 0,out V 1,out PA 10pF Realistic Preamp model V 0,out V 1,out

Differential Xtalk from Proportional Xtalk? A2..A6 B1 F1 Core to seg capacity Segment labeling: Sectors: A...F Rings: X Seg to seg capacities? Differential Xtalk will show up in adjacent segments and within same sector

How to measure …? (1)B. Bruyneel et al. NIM A 569 (2006) / MGS workshop (April 2005) / AGATA week (Nov 2005)

How to measure…? (2) “Pulse Shape Characterization and Simulation for the TIGRESS Gamma-ray Detector “ Thesis Robin Prest TRIUMF “Differential Analysis” using mirror interaction points: “differences from transients of mirror interactions are pure”  (a,b) (b,a) Differential analysis. for simulation (green) and experiment (red) Simulated signal (green) compared to experimental signal (red) suffering from cross-talk