Thomas
Jefferson National Accelerator Facility (JLab) is 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 H- beam from 2.5 to 1000 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 will be used. 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.
JLab
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