FranciscoL, [Remote: RickS]
After one week of having the inner beam centered (alog 78247), on June 11, we moved the beam by 5 mm on the Rx sensor.
The Rx side cover was compromised due to work being done by the vacuum team (images attached for reference.) Fortunately, the back cover was accessible and the measurements were done accessing the Rx input aperture through there. There might be a minor uncertainty on the alignment of the target - it was done by "projecting" the front of the power sensor by using the front camera of my phone; instead of the usual alignment by eye. Since the procedure had a regular/similar flow as the movements done on previous weeks, uncertainty of the target alignment should not be problematic for our measurements.
Attachment 'AlignedTarget' shows the alignment with the beam height gauge. Attachment 'BothBeamsBefore' shows the beams before making any changes. The pdf 'EndStationLog.pdf' lists the voltage values after each significant step of procedure T2400163. The steps represent writing down a voltage value after a particular change to the beam position. Some steps were recorded multiple times after minor changes.
- (2) Only inner beam at Rx detector. (see image 'InnerBeamBefore')
- The beam voltage was maximized before making a move. The first two values are before attempting to move. The third value comes from making a horizontal move. There was an increase of about 0.014 V (1.6%) from this move. There was no increase from moving vertically.
- (3) Finalized beam movement. (see image 'InnerBeamAfter')
- Signal is significantly higher, ~ 4.1%, than the centered beam.
- (8) Target off. The measurement was recorded after placing the pcal enclosures.
The 'Initial' measurement is *equal* to the last voltage measurement from the previous movement, done on May 21 (alog 78247). The initial and final voltage measurement during today procedure remained the same despite the increase of the inner beam with the target.
We expect this movement to be symmetric (equal in magnitude, opposite in sign) to alog 77840
