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 * Noise investigation about FFUs in the corner stations by an operator.  * '''Noise investigation about FFUs in the corner stations by an operator'''
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   *Make marks on FFU switches that are not turned off in MCE, IFI, PRM, PR3, PR2, BS, SR2, SR3, SRM, OMC with "Pink Tape".<<BR>> (Operated FFU / Total FFU) table list is below.<<BR>>130 FFUs will be turned off. This corresponds to 26kW heating power.<<BR>>26kW corresponds to about two water cooler cooling power (2 x 14kW).    *Make marks on FFU switches that are not turned off in MCE, IFI, PRM, PR3, PR2, BS, SR2, SR3, SRM, OMC with "Pink Tape".<<BR>> (Operated FFU / Total FFU) table list is below.<<BR>>130 FFUs will be turned off. This corresponds to 26kW heating power.<<BR>>26kW corresponds to about two water cooler cooling power (2 x 14kW). We expect balance.
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 || Operation/Total ||2/16||2/12 ||2/12 ||4/16 ||4/20 ||4/20||4/20 ||4/16 ||4/16 ||4/16 ||  || Remained FFU/Total FFU ||2/16||2/12 ||2/12 ||4/16 ||4/20 ||4/20||4/20 ||4/16 ||4/16 ||4/16 ||
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   * Method(2)    * Method(2): If the alignment change is too huge for us to take a sensitivity.
    * We turn off IYC-C and BS-C coolers at the same time when we turn off 130 FFUs.
    * Check the temp changes in the corner station.
    * If the temp seems to go down, we enlarge heating power. If the temp gose up, we turned on IYC-C again and heat up by heaters.
    * we expect do some try and error for several hours.
    * If alignment comes back, take sensitivity.
  

Plans for trial just after ER

  • Noise investigation about FFUs in the corner stations by an operator

    1. Preparation

      • Make marks on FFU switches that are not turned off in MCE, IFI, PRM, PR3, PR2, BS, SR2, SR3, SRM, OMC with "Pink Tape".
        (Operated FFU / Total FFU) table list is below.
        130 FFUs will be turned off. This corresponds to 26kW heating power.
        26kW corresponds to about two water cooler cooling power (2 x 14kW). We expect balance.

    Area Name

    MCE

    IFI

    PRM

    PR3

    PR2

    BS

    SR2

    SR3

    SRM

    OMC

    Remained FFU/Total FFU

    2/16

    2/12

    2/12

    4/16

    4/20

    4/20

    4/20

    4/16

    4/16

    4/16


  1. Method(1)
    • Take a sensitivity by an operator.
    • 4 people stand by (MCE, IFI, PRM), (PR3, PR2, BS), (SR2, SR3), (SRM OMC) FFU switchs.
    • Turn off almost FFUs at the same time by 4 people, except for pink one.
    • Take the sensitivity again before alignment will change.

    • Check the difference btw FFU operation and almost no FFU operation.

  2. Method(2): If the alignment change is too huge for us to take a sensitivity.
    • We turn off IYC-C and BS-C coolers at the same time when we turn off 130 FFUs.
    • Check the temp changes in the corner station.
    • If the temp seems to go down, we enlarge heating power. If the temp gose up, we turned on IYC-C again and heat up by heaters.
    • we expect do some try and error for several hours.
    • If alignment comes back, take sensitivity.

KAGRA/EngineeringRun/ER191217_24/postERtrial (last edited 2020-01-05 17:30:32 by tatsuki.washimi)