We placed the additional microphone and accelerometer for hammering test.
Before this measurement, the pressure value is about 0.38 Pa.
1. 13:00-13:50
Testing the hammering test by touching side and leg of the vacuum chamber and bellows.
And we decided one microphone and four accelerometers around the OMC chamber.
MIC : +X side of the OMC chamber
K1:PEM-MIC_OMC_BOOTH_OMC_Z_OUT_DQ
ACC1 : On the vacuum chamber
K1:PEM-PORTABLE_OMC_BOOTH_OMMT_BNC1_OUT_DQ
ACC2 : On the bellows
K1:PEM-PORTABLE_OMC_BOOTH_OMMT_BNC2_OUT_DQ
ACC3 : On the chamber leg
K1:PEM-PORTABLE_OMC_BOOTH_OMMT_BNC3_OUT_DQ
ACC4 : On the floor near the seismometer
K1:PEM-PORTABLE_OMC_BOOTH_OMMT_BNC4_OUT_DQ
2. Hammering test
13:50 Silent run
13:55 Hammering -Y side of vacuum chamber
13:59 Hammering -X side of vacuum chamber
14:02 Hammering -Y side of the leg of the vacuum chamber
14:05 Hammering -Y side of the bellows
14:07 2nd silent run
14:13 Stopped the vacuum pump
14:20 Stopped the FFUs at the OMC and SRM area
14:25 Finished the experiment
3. Preliminary analysis result
We could not find the typical difference by turning off the vacuum pump and FFUs
during turning off the vacuum pump and FFUs.(Fig.1.)
long turn and good resolution (5 a.m. this morning Fig.2. )
