Fermi National Laboratory

Operation Terminology

Microwave Absorber

As a particle beam of protons moves through a beam pipe, a negative image charge develops and travels along with particle beam in the wall of the beam pipe. As long as the beam pipe is smooth, this doesn’t cause much of a problem, but when there are bellows or aperture changes, these points cause high frequency resonances that interfere with other electronic devices, such as instrumentation. The ferrite rods absorb these high frequencies.

last modified 9/12/2002   email Fermilab
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