Three sets of movers have been assembled and aligned in a series of #2, #1 and #3 on the granite table, where #2 is the repaired one. Performances of the movers have been measured. Hysteresis of all the movers was clearly observed with applied voltage from 0 to 140V. Dynamic moving range and cross talking are summarized in following tables for #2 and #3, respectively. Results of #1 can be seen at the previous meeting (2/19,2004).
The resonance frequencies of assembled movers have been measured by hammering method. The typical damping time of oscillation was 100-200msec. The results are listed below;
Also, he explained a design of the V-block for the cavity-BPM base. The V-block is separated into two parts along beam axis to avoid a deformation of the sensor cavity. Surfaces of 1mm thickness were kept for future precise/final machining.
"Status of KEK cavity BPM", Y. Inoue and H.Hayano
The "beads" measurement of the first cavity-BPM was performed. Two resonant peaks were observed by network analyser. Their origin was not understood. The frequencies will be measured as a function of the beads position.
"Discussion on schedule"
We reminded the schedule in this month;