Slow wave pickups to measure the transverse temperature in an electron cooling experiment

An electron cooling device for cooling proton (or antiproton) beams at intermediate energies is in preparation. An inhomogeneous waveguide supporting a slow wave is proposed as pickup (PU) to measure the transverse electron cooling temperature. A synchronous pickup is essentially a structure in which the phase velocity of the propagating wave coincides with the beam velocity. The design of the pickup and the sensitivity and laboratory results are presented. A design procedure for finding the PU dimensions is indicated, and an example of such a design is reported. The validity of the principle of the slow-wave PU has been demonstrated theoretically as well as experimentally. A reasonable agreement between measurements on the PU device and the theory developed here has been obtained