Size: 1044
Comment:
|
Size: 1507
Comment:
|
Deletions are marked like this. | Additions are marked like this. |
Line 3: | Line 3: |
* Noise investigation about FFUs in the corner stations by an operator. | * '''Noise investigation about FFUs in the corner stations by an operator''' |
Line 8: | Line 8: |
|| 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 || |
Line 17: | Line 17: |
* 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
- 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
Remained FFU/Total FFU
2/16
2/12
2/12
4/16
4/20
4/20
4/20
4/16
4/16
4/16
- Preparation
- 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.
- 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.