Electron Analog Tests of Proton Linear Accelerator Structure

Electron analog tests of the 805-Mc cloverleaf accelerating structure being considered for the proposed Los Alamos linac have been made and are being extended. In the test which has been completed, 187-kev electrons, which are relatively easy to handle, are substituted for 343-Mev protons in the full-scale structure, which represents half of a prototype tank. The energy gain has been measured using a lens filter system, which acts as a decelerating device that returns the electrons to zero energy. The additional voltage needed on the lens filter to stop electrons which have been further accelerated by the cloverleaf model is a direct measure of the energy gain. The gain observed in the analog experiment corresponds to that expected from independent shunt resistance measurements.