Measurement of the beam distribution of 433 MHz proton linac in longitudinal phase space

We measured the longitudinal phase space distribution of the proton beams provided by the 433 MHz linac at ICR, Kyoto University, by means of a new monitor which consists mainly of a thin gold target, a deflector cavity, a position sensitive detector (PSD) and three permanent magnet quadrupole lenses. Protons are scattered by the target are guided into cavity, then focused by the PMQs, deflected by the cavity, then focused by the deflector electrodes, and finally reach the PSD. The position and energy data from the PSD are employed to reconstruct the phase space configuration of the beam before hitting the target. The longitudinal emittance of the ICR linac was measured with the present monitor system under some different operating conditions. The obtained measurement results were used to optimize the RF condition.