Field Measurement of the KEK Linac-Cavity by Bead Perturbation Method

摘要

The axial electric field and transit-time factors of the KEK linac were re-measured by a bead perturbation method. The acquisition and latching of the data and the resetting of the prescaler were done during 16 clock-pulse period, which reduced the counting error within one for every datum. Quadratic fitting method was adopted to smooth the fluctuation of the original data. The transit-time factors were calculated in a more strict sense than ever. The results show that the slope of the field and the transit-time factors in the low energy are slightly larger that those measured by S. Okumura and D. Swenson. The gradual decrease of synchronous phase after the 77th cell was also observed. (Atomindex citation 11:541603)