Patent ID: 9674026
Date: 2017-06-06
CPC Classifications: A61N,H04L

Claim:
1. A method for measuring the relative amplitude of the signals from a position sensitive beam pickup in an energy recovered linear accelerator, comprising: providing an in phase and quadrature (I/O) beam position monitor receiver including I-channels and Q-channels; introducing an accelerated beam into the energy recovered linear accelerator; selecting an RF reference; adjusting the relative phase between the RF reference and the I/O receiver until the Q-channel has zero amplitude to synchronize the Q-channel of the position monitor for use; applying an accelerated beam and a decelerated beam to the system wherein the phase of the decelerated beam, relative to that of the electromagnetic fields within the accelerating cavity, is that of the accelerating beam plus or minus approximately 180°; setting the RF frequency (mω reading the position information for the accelerated beam from the I-channels; reading the position information for the decelerated beam from the Q-channels; determining a cavity phase difference between the accelerated beam and the decelerated beam to determine if the energy recovered linear accelerator is at maximum energy recovery; and introducing a correction based on the accelerated/decelerated beam cavity phase difference from 180° in order to improve the accuracy of the beam position calculation.