Speaker
Changbum Kim
(Pohang Accelerator Laboratory)
Description
A bead test was conducted to measure the shunt impedance (R/Q) of the cavity beam position monitor (BPM) for PAL-XFEL. R/Q is an important parameter of a cavity BPM because it relates to the signal strength, which determines the resolution of the beam position measurement. In the bead test, a dielectric and metal bead were used to assess the frequency change at various bead positions. The measurement results of the two beads from the monopole cavity were similar, but the results from the dipole cavity differed significantly. This discrepancy can be explained by considering the distribution of the electric and magnetic fields in the cavity structure and the materials of the two beads.
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Author
Changbum Kim
(Pohang Accelerator Laboratory)
