The dimension between the yokes and the Cyclotron upper structure primary beams was set to .25" nominal at all jack stations today.
At each station:
- The jacks were jogged manually upwards until the yokes hard-stopped on a piece of .25" nominal shim stock (see attached reference photo, measured accurate within .005").
- The dial indicator was set and zeroed, and the station was backed off by .005" to 0.010" in order to remove the .25" reference stock (except at station 4 where the dial indicator mount was damaged).
- After the adjustment, the mechanical counter was decoupled from the output shaft of the jack (without affecting the synchro) and set to "00100".
This work was performed by Maico Dalla Valle and Daniel Wright in co-ordination with Dan Louie.
The defective mechanical counters at stations 5 and 9 were replaced, with a brand new counter at one station and a used repaired counter at the other station.
The yokes at all jacking stations should now be .250" +/- .015" from the upper structure.
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