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We describe the concept and procedure of drifted-charge extraction developedin the MicroBooNE experiment, a single-phase liquid argon time projectionchamber (LArTPC). This technique converts the raw digitized TPC waveform to thenumber of ionization electrons passing through a wire plane at a given time. Arobust recovery of the number of ionization electrons from both induction andcollection anode wire planes will augment the 3D reconstruction, and isparticularly important for tomographic reconstruction algorithms. A number ofbuilding blocks of the overall procedure are described. The performance of thesignal processing is quantitatively evaluated by comparing extracted chargewith the true charge through a detailed TPC detector simulation taking intoaccount position-dependent induced current inside a single wire region andacross multiple wires. Some areas for further improvement of the performance ofthe charge extraction procedure are also discussed.

Ionization Electron Signal Processing in Single Phase LArTPCs I. Algorithm Description and Quantitative Evaluation with MicroBooNE Simulation