GRAPHALLOY® Solves a Proton Beam Problem!
 The Fermi National Accelerator Laboratory (Fermilab) is a 2
bolt flange Department of Energy atomic particle research lab in Batavia, IL.
Fermilab specializes in high energy physics research and devotes much of their
efforts toward understanding the basic properties of fundamental particles
including neutrinos and other subatomic particles.
Fermilab recently turned to GRAPHALLOY® bearings to solve a problem in a
critical "neutrino target adjustment" mechanism when previous solutions had
failed. Fermilab's MINOS (Main Injector Neutrino Oscillation Search) is designed
to observe neutrino beam composition and energy distribution as it travels
underground from Fermilab in Illinois to the Soudan Iron Mine in Minnesota.
Neutrinos produced by the particle accelerator at Fermilab are "beamed" 450
miles through the earth!
To produce this beam of neutrinos, a proton beam starts at the Main Injector
accelerator. The protons are magnetically 2 bolt flange focused onto a target.
Once the protons strike the target, secondary particles are produced, focused by
a pair of magnetic focusing "horns". The particles of interest then decay into
neutrinos. It is the mechanical adjustment of these focusing horns that requires
GRAPHALLOY® bearings. The GRAPHALLOY® bearings conintue to outlast the other
materials in this target assembly.
 This operation runs in a particularly hostile environment. It
is radioactive and corrosive and is exposed to nitric acid and ionized air.
Metallic bushings cannot be used. In addition, polymers, organics, plastics and
oil cannot be used in the operation. Finally, the bearings must run dry.
The unique properties of GRAPHALLOY® provided the solution to this application.
GRAPHALLOY® bushings were used to target and position the horns because other
materials would corrode and freeze up.
This is an excellent example of how GRAPHALLOY® can solve problems under harsh
operating conditions.
END
Further Information
For further information relating to any of the above products, please contact
Tony Snowdon on 0113 252 1061 or e-mail tonys@ftltech.co.uk
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