Tevatron: past beam-beam experience and plans for run II
 
This paper is concerned with three sets of operating
conditions for the Tevatron proton pbar Collider at Fermilab :
the completed Run I (6 bunches X 6 bunches),
Early Run II (36 X 36), which we hope to begin in Summer '00,
and Late Run II (~100 X 100). For each of these we will review
the operating parameters and our discussions will concentrate
on the beam beam problems. For the completed Run I, 
we can discuss the experimental difficulties and problems, 
as well as how we dealt with them. However, there is
only a limited theoretical understanding of these conditions.
Each of the future conditions for Run II brings substantial
new challenges. In early Run II, we will be increasing the
number of bunches and near misses by a factor of 6. 
We also will be attempting to
recover and re-cool the pbars that remain at the end of stores.
Later in Run II, we hope to increase the number of bunches by
about another factor of 3. To keep the beams separated near the
Interaction Points, we will require a crossing angle with its
attendent complications. For the future conditions, we only have
some simple calculations and ideas of what some of the experimental
difficulties will be.