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AdV-DET (Commissioning)
gouaty - 23:52 Friday 24 August 2018 (42535) Print this report
Low frequency line on suspended benches for scattered light evaluation

This afternoon we injected a line at 0.1 Hz on the various suspended benches along the Z degree of freedom in order to be able to re-evaluate the scattered light coupling factors.

The collected data is summarized in the table below. Analysis to be done.

Bench Amplitude (bench Z motion) Start (utc) Duration Comments
SDB1 +/-16 um 15:24:08 120 SDB2 Z control ON
SDB1 +/-20 um 15:26:55 240 SDB2 Z control ON, See Fig.1
SDB1 +/-20 um 15:31:23 180 SDB2 Z control OFF
SDB2 +/-25 um 17:20:59 240 See Fig.2
SNEB +/-25 um 18:02:43 180  
SNEB +/-40 um 18:05:56 240 See Fig.3
SWEB +/-40 um 18:16:57 180 See Fig.4
SWEB +/-35 um 18:20:06 240 See Fig.5
SPRB +/-40 um 18:28:43 150  
SPRB +/-80 um 18:34:25 120  
SPRB +/-160 um 18:36:43 180 See Fig.6
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Comments to this report:
mwas - 18:14 Sunday 26 August 2018 (42539) Print this report
The last measurement was done in May 14 2018

SDB2 scattering coefficient increased from 4e-6 to 20e-6
SDB1 coupling remains at same level, 6e-5, but the coupling is very well explained by MICH noise, see figure 1, so this is just an upper limit
SNEB coupling remains the same at 1.0e-5
SWEB coupling slightly reduce from 1.1e-5 to 0.8e-5
SPRB coupling is not clear, previously we had only an upper limit, now it seem the coupling is at the level of that upper limit: 1e-7, see figure 2.

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