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Number of pbars!!!
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NOT (primarily) due to protons on target or pbar
production rate.
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Typically only around 50% of pbars from the
accumulator make it to
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collisions.
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Some of this is due to large emittances out of the
accumulator. This gets
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worse with larger stacks.
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Some is due to aperture and matching problems
throughout the system.
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Long range beam interactions in the Tevatron:
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Limit total number of protons.
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Due to aperture and helix problems.
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General reliability problems:
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It’s a very complicated system
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If we lose the antiprotons, it takes at least
12 hours to recover.
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