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Published byJoseph Adair Modified over 2 years ago

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% Charge lost to routing line (detector No irradiation) % Voltage(V) Charge lost to routing line predicted to be O(5%) Charge lost reduces with higher operating voltage

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% Charge lost to routing line (detector with irradiation at 400V) % Fluence ( p/cm 2 ) Charge loss to routing line predicted to be largely independent of fluence

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Peaking Time Use Response function of Front End ns Voltage Unirradiated

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Peaking time ns Fluence ( p/cm2) Irradiated Detector (400V) Small increase in peaking time

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Charge Collection Arbitrary Units Voltage Unirradiated

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Charge Collection Arbitrary Units Fluence ( p/cm2) Irradiated Detector (400V) Drop in total charge collected (lose approx 35%)

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Cluster Profile Example PR μm 0deg Unirradiated Normal incidence over middle Strip Cluster Shape v Voltage Fluence ( p/cm2) PR μm 0deg Normal incidence over middle Strip at 400V Cluster Shape v Fluence

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Cluster Profile Example PR μm 0deg Unirradiated 9° incidence over middle Strip Cluster Shape v Voltage Note change of cluster mode strip

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Cluster Profile Example PR μm 0deg Unirradiated 9° incidence over middle Strip Cluster Shape v Voltage PR μm 0deg Irradiated 400V 9° incidence over middle Strip Cluster Shape v Fluence Fluence ( p/cm2)

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Cluster Profiles Example Centred on strip 3 (0°) Midway between 2 and 3 (0°)

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Cluster Profiles Lot of information –PR : 0°,9° –PR : 0°,9° –PR : 9° Function of Voltage and Fluence!

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Simplified Analyses Data available for more realistic cluster analysis of data… Remove hit strips that are less than 0.1 MIP (S/N should be better than this!) Look at cluster centroids as a function of entry point and angle into the detector –Example of how to get it wrong –BUT NOT just an artefact of clustering –Mobility of e and h and sampling time

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Shift Errors 32.5 pitch, 0° Incidence 32.5 pitch, 9° Incidence 70.0 pitch, 0° Incidence 70.0 pitch, 9° Incidence

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Shift Error with Radiation 32.5 pitch, 9° Incidence 70 pitch, 9° Incidence Fluence ( p/cm2) Fluence ( p/cm2) Inclined tracks have more problems As detector degrades effects appear to get larger

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Approx Ideal Resolution PR μm (140V) 70μm (140V) 0°0°~4μm~4μm~10μm 9°9°~4μm~4μm~7μm~7μm 1/ 12 9μm9μm20μm

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