The upgraded DO detector for Run II at the Fermilab Tevatron is described.
Its expected performance is compared to that observed in the Run I detector
. With an eye toward the March 2001 start date for the Tevatron, the status
of the project is also summarized. Finally, studies of the changes to the
Run II detector necessary for it to continue to function effectively for in
tegrated luminosities beyond the 2 fb(-1) baseline are mentioned. (C) 2001
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