A simple low-frequency BPM
Sam Heifets, Novokhatski, A. Aleksandrov · 2008
Detection of the field induced by a beam outside of the beam pipe can be used for the beam diagnostics.A wire in a longitudinal slot in the beam pipe wall can be used as a beam position monitor with a very small coupling impedance avoiding complications of the feed-through.The signal can be reasonably high at low frequencies.We calculate the beam-coupling impedance due to a long longitudinal slot and the signal induced in a wire placed in such a slot and shielded by a thin screen from the beam.Results can be relevant for impedance calculations of the slot to ante-chamber and slots of the DIPs.