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Time-of-Flight effect in the TPC

Time-of-Flight effect in the TPC. Vdrift. By the time a track traverses the TPC volume (~150cm, ~5ns) the inner hits will have moved due to TPC drift velocity (~50um/ns) The tracker will reconstruct a track ( red dotted ) that will not point to vertex but higher z-value

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Time-of-Flight effect in the TPC

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  1. Time-of-Flight effect in the TPC Vdrift • By the time a track traverses the TPC volume (~150cm, ~5ns) the inner hits will have moved due to TPC drift velocity (~50um/ns) • The tracker will reconstruct a track (red dotted) that will not point to vertex but higher z-value • If used in alignment this effective track tilt will produce an effect (kink) like the one we observe. • STI was correcting for this effect in our simulations

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