MinhyoK, FranciscoL, [Remote: DriptaB]
After one week of moving the inner beam 5 mm to the right of the Rx (see alog 77840), we moved the beam to the center. This will help to evaluate the reproducibility of this procedure and the risks from moving the beam at the ETM.
Attachment 'BothBeamsBefore' shows the beams before making any changes. (image taken before step (1))
The pdf 'EndStationLog.pdf' lists the voltage values after each significant step of procedure T2400163. The steps are represent writing down a voltage value after a particular change of the system:
- 'Pre' - Nothing has changed, reading voltmeter after plugging it to "Rx PD Mon".
- (1) Alignment of the target.
- (2) Only inner beam at Rx detector. (see image 'InnerBeamOffCenter')
- (3) Finalized beam movement. (see image'InnerBeamCentered')
- (4) Both beams at Rx detector, target still on (see image 'BothBeamsAfter')
- (8) Target off.
- 'Final' - Measuring after placing enclosures.
The initial measurement (done on step 'Pre') agree with the last voltage measurement from the previous movement, done on May 14 (see alog 77840), by a factor of 3 HOPs.
The changes we saw from making the movement of last week will be reported as a comment to alog 77840. In summary, our values disagree by a relative difference (measured/expected -1) of 15%.
With the movement made today, we expect that the X/Y comparison will return to a value of 1 in the upcoming week.
