By analyzing the recent TCam images, I identified the mirror center of ETMX, ITMX, and ITMY. When the ETMY or GreenY is ready, we will try to take the ETMY image and identify the mirror center.

Details

• For ETMX, I had an accidental chance to take the TCam for ETMX illuminated by Greenx on 4/23 (during adjustment work of PR2). For ITMX and ITMY, the image was taken on 3/15 (klog#28863).
  • Note that the ETMX image was taken after the evacuation an the ITMX and ITMY images were taken before the evacuation.
• ETMX
  • fitting result
  • overlay with previous reference center (Magenta shows the previous mirror edge and center. Yesllow shows the latest fitting result)
  • From this analysis, I updated the fixed radiuss of 1243 pixel which was computed from the conversion factor of 10/113 = 0.0885 [mm/pixel]. This was evaluated from the metal-scale-insert test(klog#28843).
• ITMX
  • fitting result
  • overlay with previous reference center (Magenta shows the previous mirror edge and center. Yesllow shows the latest fitting result)
  • From the metal-scale-insert test(klog#28843), I evaluated the conversion factor as 10/60 = 0.167 [mm/pixel]. Accordingly, the mirror radius could be 660 pixel. But, this estimation has large uncertainty. If one pixel changes in the estimation, the mirror radius changes 600~733 pixel. I decided to use the fixed radius of 630 pixel which we evaluated by hand fitting with Aogaku members previously, because this value has the small uncertainty than the metal-scale-insert test.
• ITMX
  • fitting result
  • overlay with previous reference center (Magenta shows the previous mirror edge and center. Yesllow shows the latest fitting result)