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Size: 3212
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← Revision 46 as of 2023-06-22 13:24:12 ⇥
Size: 4753
Comment:
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| Deletions are marked like this. | Additions are marked like this. |
| Line 67: | Line 67: |
| == OMC Venting and Repumping Procedure with HPL preparation with PLL (2023/Jan/30~Feb/4) == | == OMC Venting and Repumping Procedure with HPL preparation with PLL (2023/Jan/30~Feb/3) == |
| Line 69: | Line 69: |
| *(Jan 30) * Before 9:00: FPMI realignment (Yokozawa-kun), Preparation for venting (Kimura-san, M.Takahashi-san) |
* (Jan 30, Mon) * Before 9:00: FPMI realignment (Yokozawa-kun), Preparation for venting (Kimura-san, M.Takahashi-san), Turning on all FFUs in the OMC area. |
| Line 72: | Line 72: |
| * After informing the start of venting from Kimura-san to R. Takahashi-san, Kimura-san start venting. | * After informing the start of venting from Kimura-san to R. Takahashi-san, Kimura-san starts venting. |
| Line 75: | Line 75: |
| * Miyoki changes the PSL from OBS to Wrok mode at this timing with IMC ASC? or around after all works are done on Jan 30? | * Miyoki changes the PSL from OBS to Work mode at this time with IMC ASC? or around after all works are done on Jan 30? |
| Line 78: | Line 78: |
| * Just after the PSL mode change, Miyakawa-kun starts FB -> HPL changing. * After closing the GV between SRM/SR2, Kimura-san starts opening the bellows at GV. Start the repair work. We would like to avoid removing the all bellows duct to reduce the risk to produce another leak on the healthy opposite side. |
* (Para)Just after the PSL mode change, Miyakawa-kun starts FB -> HPL changing and IMC control with HPL. * (Para)After closing the GV between SRM/SR2, Kimura-san starts opening the bellows at GV. So no laser to OMC area. Kimura-san starts the repair work. We would like to avoid removing the all bellows duct to reduce the risk to produce another leak on the healthy opposite side. * (Jan 31, Tue) * Kimura-san dose repair work and closes again. Also, after checking no problem happens in the vacuum level in SRM, the GV between SRM/SR2 is opened. Check the IR beam to and from OMC by ??. * Recover the operated FFU number in OMC as before this wrok. * After this work, R.Takahashi-san dose health check for OMC suspensions in this day or tomorrow morning * Miyakawa-kun PLL control adjustment with Izumi-kun. Sometimes, IMC unlock is expected? * The GR frequency will be kept, while the HPL IR frequency will be adjusted by changing the crystal temp. * (Feb 1, Wed) * Morning * Miyakawa-kun's HPL works. * Noontime * From 13:00?, Kimura-san informs R. Takahashi-san and Aso-kun about the start of pumping. The Kimura-san starts pumping gradually. * If OMMTs realignment with pico is necessary, It will be done. * (Feb 2, Thu) * Miyakawa-kun change the HPL to FB again? After this or earlier timing, the PSL room should be set to OBS mode again.(Or should we do in the week end holidays?) * Kimura-san/Yasui-san start the vacuum leak check. If no leak is verified, we will decide when we can open the GV, judging from the vacuum level reduction speed. * Opening GV might result in the realignment of the IF beam to OMC. * (Feb 3, Fri) * DGS maintenance day. == OMC Blade Damping (2023/June/22) == * Somiya-kun's Presentation * |
Output Mode-cleaner
Meetings
Installation work
Reports
Requirement
Shot noise increase due to the signal reduction by the OMC and residual spatial higher order modes after the OMC should be less than 5%.
Optical Design (updated 19/8/11)
item |
RoC |
Beam Raidus |
Misc |
OMMT1 |
13.16m |
4.46mm |
Dia: 99.95mm, thick: 55.58(largest), wedge: 2.45deg (measured by Hirose-san 2018) |
OMMT2 |
44.39m |
2.68mm |
Dia: 99.97mm, thick: 55.08(largest), wedge: 3.3deg (measured by Hirose-san 2018) |
OSTM |
flat |
TBA |
|
OMC1 |
flat |
444um |
|
OMC2 |
flat |
444um(X)/447um(Y) |
|
OMC3 |
1.80m |
604um |
|
OMC4 |
1.80m |
604um |
|
DCPD |
-- |
592um |
Space |
Distance |
AOI |
SRM-OMMT1 |
5.63m |
3.07deg |
OMMT1-OMMT2 |
2.60m |
3.07deg |
OMMT2-OSTM |
2.97m |
90deg |
OSTM-OBS1 |
0.30m |
90deg |
OBS1-OMC1 |
0.03m |
0.078deg |
OMC1-OMC2 |
0.357m |
3.00deg |
OMC2-OMC3 |
0.359m |
3.00deg |
OMC3-OMC4 |
0.357m |
3.00deg |
OMC4-OMC1 |
0.359m |
3.00deg |
Suspension Design
Total mass to be suspended |
13kg |
Number of suspensions |
3 |
Blade spring size |
220mm x 53mm |
Radius of curvature |
190mm |
Distance from a blade end to a suspension wire |
203.5mm |
Blade material |
MAS-1 |
Blade mass |
4.3kg |
Control Scheme
LSC |
|
Dither frequency |
1kHz (tentative) |
Dither optics |
OMC3 or OMC4 |
Signal extraction port |
OMC trans DCPDs |
ASC |
|
Dither frequency |
not yet decided |
Dither optics |
OSTM (tentative) |
Signal extraction port |
OMC trans DCPDs; on-board QPDs are used for the course alignment |
OMC Venting and Repumping Procedure with HPL preparation with PLL (2023/Jan/30~Feb/3)
- (Jan 30, Mon)
- Before 9:00: FPMI realignment (Yokozawa-kun), Preparation for venting (Kimura-san, M.Takahashi-san), Turning on all FFUs in the OMC area.
- Keep IMC lock using the present fiber laser. Stanby of R.Takahashi-san and Aso-kun for monitoring.
- After informing the start of venting from Kimura-san to R. Takahashi-san, Kimura-san starts venting.
- If OMMTs realignment with pico is necessary, It will be done.
- After finishing venting, Kimura-san informs to R.Takahashi-san, Aso-kun, Miyakawa-kun and Miyoki.
- Miyoki changes the PSL from OBS to Work mode at this time with IMC ASC? or around after all works are done on Jan 30?
- IP2? HV drift monitoring.
- Offload of IMC suspensions and IP1/2?
(Para)Just after the PSL mode change, Miyakawa-kun starts FB -> HPL changing and IMC control with HPL.
- (Para)After closing the GV between SRM/SR2, Kimura-san starts opening the bellows at GV. So no laser to OMC area. Kimura-san starts the repair work. We would like to avoid removing the all bellows duct to reduce the risk to produce another leak on the healthy opposite side.
- (Jan 31, Tue)
- Kimura-san dose repair work and closes again. Also, after checking no problem happens in the vacuum level in SRM, the GV between SRM/SR2 is opened. Check the IR beam to and from OMC by ??.
- Recover the operated FFU number in OMC as before this wrok.
- After this work, R.Takahashi-san dose health check for OMC suspensions in this day or tomorrow morning
- Miyakawa-kun PLL control adjustment with Izumi-kun. Sometimes, IMC unlock is expected?
- The GR frequency will be kept, while the HPL IR frequency will be adjusted by changing the crystal temp.
- (Feb 1, Wed)
- Morning
- Miyakawa-kun's HPL works.
- Noontime
- From 13:00?, Kimura-san informs R. Takahashi-san and Aso-kun about the start of pumping. The Kimura-san starts pumping gradually.
- If OMMTs realignment with pico is necessary, It will be done.
- From 13:00?, Kimura-san informs R. Takahashi-san and Aso-kun about the start of pumping. The Kimura-san starts pumping gradually.
- Morning
- (Feb 2, Thu)
- Miyakawa-kun change the HPL to FB again? After this or earlier timing, the PSL room should be set to OBS mode again.(Or should we do in the week end holidays?)
- Kimura-san/Yasui-san start the vacuum leak check. If no leak is verified, we will decide when we can open the GV, judging from the vacuum level reduction speed.
- Opening GV might result in the realignment of the IF beam to OMC.
- (Feb 3, Fri)
- DGS maintenance day.
OMC Blade Damping (2023/June/22)
- Somiya-kun's Presentation