A Rigaku Tech visited LEXI for the UltimaIII maintenance .
Dec. 1 2014:
i) Original optical configuration: BB/Dtex.
ii)The optics was switched to BB/SC; reference Si samples was tested. It was found that the attenuator was not installed and receiving slit box was not installed at right position.
iii) The optics was set as PB/SC; CBO peak position was checked. After 2 months operation, the peak position was found to be shifted ~12% (one month 9%).
iv) PB optical alignment could not be performed smoothly. The PB alignment failed twice for unknown reasons.
vi) All test results and alignment results were sent to TX for review. Waiting for feedback….
Dec. 2 2014:
i). The tech got more experience with the UltimaIII. Finally BB optical alignment was completed without difficulties.
ii) PB optical alignment could be performed without difficulties. The less absorbers were used for optical alignment. It was believed that the counting loss calibration could be better in this way. Tests with regular PB and BB optics looked like normal.
iii). PB thin film stage alignment was performed but failed with an error message saying the attenuator can’t be switched to “0” position “.
Test results were sent to TX Woodland for further review and feedback…..
Dec. 3 2014
The thin film stage alignment still can not be performed successfully with unknown reasons.
More diagnosis and trouble-shooting is required…