Measurement of the beam current in the compact storage ring based on the conservation of RF power

AURORA is an electron storage ring of the weak focusing type composed of a single body superconducting magnet and does not allow the use of a conventional method for the measurement of stored beam current. A new method has been developed, in which the power conservation in the RF accelerating system and the normalized load impedance are taken into account and combined in to a single equation. By measuring the beam loading through the radiation power measurement at various magnitudes of stored beam current and referring to the equation, the absolute value of the beam current can be obtained.