Design and operation of LongBo: a 2 m long drift liquid argon TPC

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In this paper, we report on the design and operation of the LongBo time projection chamber in the Liquid Argon Purity Demonstrator cryostat.

• This chamber features a 2 m long drift distance.
• We measure the electron drift lifetime in the liquid argon using cosmic ray muons and the lifetime is at least 14 ms at 95\% confidence level.
• LongBo is equipped with preamplifiers mounted on the detector in the liquid argon.