How do the "drift tubes" in linear particle accelerators
shield the charged particles from the electric charges that would
otherwise slow them down? Also, how is alternating current used to
generate these electrical fields?
Stray electric fields are kept out of the drift region by completely
surrounding it with a conducting material. Alternating current is rectified
and filtered to make a D.C. voltage (just like any other D.C. power supply)
that is used to put the desired electric field in the drift region.
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Update: June 2012