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VIS (BS)
fabian.arellano - 15:19 Monday 26 October 2020 (15322) Print this report
Buoyancy effect in Type-B suspensions GAS Filters.

When the suspensions are brought back to atmospheric pressure, the bodies are subject to a bouyancy force that moves the GAS Filter keystones upwards. Such displacements are shown below.

  • Venting began on Thursday  22nd of October in the morning.
  • Venting finished on Monday 26th of October just before 12 o'clock.
  • The temperature remained constant throughout the process.

The values below are particularly important for BS and SR3, whose ballast masses will be adjusted soon.

Beam splitter

BS GAS Filter Initial (µm) Final (µm) Buoyancy effect (µm)
F0 122 1374 1,252
F1 356 568 212
BF -7.4 356 363
Temperature 23.6 °C 23.6 °C  

 

SR2 suspension

SR2 GAS Filter Initial (µm) Final (µm) Buoyancy effect (µm)
F0 -1070 -888 182
F1 33 834 801
BF 19 336 317
Temperature 23.8 °C 23.8 °C  

 

SR3 suspension

SR3 GAS Filter Initial (µm) Final (µm) Buoyancy effect (µm)
F0 -799 -511 288
F1 -417 44 461
BF -211 100 311
Temperature 23.3 °C 23.3 °C  

 

SRM suspension

SRM GAS Filter Initial (µm) Final (µm) Buoyancy effect (µm)
F0 -1,596 -1,466 130
F1 -67 349 416
BF 119 454 335
Temperature 23.0 °C 23.0 °C  



 

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