With Michimura
We performed the integrating shpere calibraiton for Pcal-X.
The results are similar to the previous measurements.
Result Summary:
Alpha values are voltage ratio between ISs in XPcal and WSK.
alpha_RxPDpWSK_1 = 1.01099 +- 0.00028
alpha_RxPDpWSK_2 = 1.00658 +- 0.00034
alpha_TxPD1pWSK = 2.84929 +- 0.00030
alpha_TxPD2pWSK = 3.88791 +- 0.00037
e values are optical efficiency values.
e_1 = 0.96496 +- 0.00020
e_2 = 0.95479 +- 0.00023
Before this work, I checked the Pcal-X beam positions on the ETMX, and adjusted a little.
What I used are PCAL_EX2 picos.
Pico movment:
Beam positions on the ETMX changed by about 2mm:
Before ([0,0] means the design position.): Fig 1 = TCam_ETMX_00111_2024_1120_051540_fitting_comp.png
After: Fig 2 = TCam_ETMX_00111_2024_1120_054412_fitting_comp.png
During calibration at the end station, we found the beams were slightly(2-3mm) shifted from the centre on the RxPD.
Today, we proceeded the calibration without making the adjustment. The impact on the calibration results appears to be limited, but it may need to be adjusted in the future.
