• KAGRA
• EngineeringRun
• ER191217_24
• postERtrial

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).

  Area Name	MCE	IFI	PRM	PR3	PR2	BS	SR2	SR3	SRM	OMC
  Operation/Total	2/16	2/12	2/12	4/16	4/20	4/20	4/20	4/16	4/16	4/16

2. 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.
     

3. Method(2)