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Designs of high-voltage (HV) systems for creating a drift electric field inliquid argon TPCs are reviewed. In ongoing experiments systems capable ofapprox. 100 kV are realised for a drift field of 0.5-1 kV/cm over a length ofup to 1.5 m. Two of them having different approaches are presented: (1) theICARUS-T600 detector having a system consisting of an external power supply, HVfeedthroughs and resistive voltage degraders and (2) the ArDM-1t detectorhaving a cryogenic Greinacher HV multiplier inside the liquid argon volume. Fora giant scale liquid argon TPC, a system providing 2 MV may be required toattain a drift length of approx. 20 m. Feasibility of such a system isevaluated by extrapolating the existing designs.

Feasibility of high-voltage systems for a very long drift in liquid argon TPCs