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SNS Partnerships:
Brookhaven National Laboratory
The Accumulator Ring
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Interior of the SNS ring tunnel during equipment installation.
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Brookhaven
National Laboratory (BNL) was
responsible for the accumulator
ring structure, which bunches and
intensifies the ion beam for delivery
to the mercury target to produce
pulsed neutron beams. The intense
negative hydrogen (H-) beam from
the linac must be compressed more
than 1000 times to produce the extremely
short, sharp bunch of neutrons
needed for optimal neutron-scattering
research. To accomplish this goal,
the H- pulse from the linac is wrapped
into the ring through a stripper
foil that strips the electrons
from the negatively charged hydrogen
ions to produce the protons (H+)
that circulate in the ring. Approximately
1,200 turns are accumulated, and
then all of the protons are kicked
out at once, producing a pulse less
than 1 millionth of a second (10-6 seconds)
in duration that is delivered to
the target. In this way, short,
intense proton pulses are produced,
stored, and extracted at a rate
of 60 times a second to bombard
the target.
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