Measurements of the cyclotron magnet face gap were taken on March 15, 2013 at two locations around the tank with the cyclotron lid in the fully raised position (the lid had been raised until the upper limit switches caused the control system to stop travelling).  The purpose of the measurements is to establish an independent means of verifying correct lid height before beginning in-tank remote handling activities at the start of a shutdown period.

The height of the lid at the time of measurement was confirmed to be adequate for the bridge to perform a full orbit without any interference between the bridge or cable tray and devices on the lid.

Measurement locations were labelled using permanent marker.  A plumb-bob was used to ensure the measurement location on the upper and lower faces were aligned vertically.  The measurements were performed using a tape measure hung from the upper magnet face and read at the lower magnet face as shown.

Location #1: RH bridge entry/exit point (~50° position), Measured gap: 46-1/2" +/- 1/16"

Location #2: East side of jack station #1 (~215° position), Measured gap: 46-9/16" +/- 1/16"

Photographs of the upper limit switches on jack stations #1 and #10 were taken as shown below:

At this lid height, the reference stick on the top of the cyclotron lid was found to be touching the concrete ceiling, but was not bowed.  See photo below.

 The distance between the cyclotron tank lid and the RH bridge was then measured using a meter stick attached to the lift trolley.  The trolley was moved into the tank, and the stick raised until it contacted the tank lid.  This position was recorded, the stick was lowered, the trolley was removed from the tank, then the stick raised again to the recorded position.  A piece of aluminum angle was used to translate the measurement from the center of the trolley to the edge of the bridge as shown below:

Total Distance from RH Bridge Rail to Cyclotron Tank Lid: 15-7/16" + 6-5/16" = 21-3/4" +/- 1/8"