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The proton and pbar beams
circulating in the Tevatron beam pipe travel in opposite directions on
separate helical orbits. Electrostatic separators provide the kicks
that separate the beams as they twist around each other except at the
desired collision points at the B0 and D0 low-beta interaction regions.
The aim of the helix and separator project is to investigate and improve the
beam-beam separation to mitigate the effects of long-range beam-beam
interactions. Tasks include:
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Building additional polarity
switches to allow all separators to run in both polarities. This
will allow us to put protons on the pbar helix all the way to low-beta.
The additional switches may allow greater flexibility with helix designs.
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Design a new injection helix that
uses more separators (only use 5/13 now) to improve beam separation at
high-energy and simplifies the transition to the collision helix.
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Install additional (spare)
separators to implement new helices that would allow increased separation
during HEP stores.
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2004 shutdown: installed 2 vertical separators installed at D17;
in use for HEP.
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2006 shutdown: replaced 3 A49 separators with
ones passing higher voltage conditioning; installed new horizontal
separator @ A17 and new vertical separator at B48. The 3 removed
from A49 will be reconditioned for use as spares.
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Determine the maximum voltage at
which the existing separators can operate reliably (spark rate).
Determine how to increase operating voltage. (electropolishing, new
feedthrough design, improved conditioning procedure)
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