SNS Partnerships:
Thomas Jefferson National Accelerator Facility
The Linac
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The superconducting linac.
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Thomas
Jefferson National Accelerator Facility (JLab)
was responsible for the superconducting niobium
cavities used in the linear accelerator, or linac.
The niobium cavities are cooled with liquid helium
to an operating temperature of 2 K. The linac,
which accelerates the beam of negatively charged
hydrogen ions from 2.5 to 1,000 MeV, or 1 GeV,
is the responsibility of Los Alamos National Laboratory.
The linac is a superposition of normal conducting
and superconducting radio-frequency cavities that
accelerate the beam and a magnetic lattice that
provides focusing and steering. Three different
types of accelerators are used at SNS. The first
two, the drift-tube linac and the coupled-cavity
linac are made of copper, operate at room temperature,
and accelerate the beam to about 200 MeV. The
superconducting niobium cavities provide the remainder
of the acceleration.
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