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CRY (Cryo-payload EX)
takafumi.ushiba - 12:47 Monday 03 May 2021 (16644) Print this report
Height measurement of ETMX

[Tomaru, Ushiba]

We measured the height of ETMX again.

First, we checked the target precision by using auto level.
We compaired the target we used for height measurement with references of duct shield center.
The measured valuses are as follows:
Target - beam duct center of -X side: +0.1 mm
Target - beam duct center of +X side: -0.2 mm
So, the target looks good enough for the refeerence of the height measurement.

Then, we measured the ETMX height by using laser level with respect to the target.
The mirror height is now -8.5 mm lower than the target.
Since we use laser level for the measureent, precision is about 1 mm.

According to klog16535, ETMX was lifted up by 8 mm and measured height before lift up was -19.5 mm.
So, current height should be -11.5 mm, which is 3 mm far from the current height.
The difference looks slightly large but we are not sure why.

Comments to this report:
ryutaro.takahashi - 16:40 Thursday 06 May 2021 (16661) Print this report

Checked each height of keystones with the LVDT. All heights were not changed from ones recorded when we jacked up by 8mm (klog#16613).

ryutaro.takahashi - 17:44 Monday 10 May 2021 (16691) Print this report

[Takahashi, Sato]

Checked height of BF. The height was not changed (less than 0.5mm) from one recorded when we jacked up by 8mm (klog#16613).

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