Diff for "KAGRA/IFOIntegration2022/2022OMCClosing"

Differences between revisions 13 and 19 (spanning 6 versions)

OMC Closing Review (2022/11/18)

OMC (Aso, NAOJ)
- Higher mode rejection -> OK with good mode matching.
- New optical board to remove additional structure for resonance dumping.
- New high-quality mirror. -> 97% T_FP.
- Replacement of the broken PD
- 800 Hz resonance still remains. -> unstable lock in air. Pumping down OMC are will mitigate this resonance.
  - FP_tra estimation in air ~ 0.89 derived by subtracting HOMs power sum from the total power.
- OMC alignment. OSTM should not be moved by pico to avoid trouble.
- Dark noise: same btw both PDs.
OMMT1, OMMT2, OSTM Suspension (Takahasi, NAOJ)
- Transfer Function
- OSEM output values
- Space btw magnets and plates
- Pico motion
Installation Acceptance Document for modified sub-optics in the OMM and OMC chambers (Akutstu, NAOJ)
- klog#22934
- klog#22942
OMMT2T optical setting for sensing OMMT1/SR2 motion separately (Ushiba, Akutsu, Miyoki, Sato, Takahashi)
- klog#22604
- klog#22611
- klog#22844
- klog#22848
- klog#22946
- Final alignment and Iris removal.
- Reliable cover using aluminum foils.
Vacuum Issues
- Clamp preparation -> OK, f300 -> metal, f800 -> elastomer,
- TMP/IP alignment OMC-OMMT-TMIPunit.pdf
- Trouble in a -Y side Hatch
- Opened viewports confirmation
- Cleaning inside
- Leak in GV_srm-OMM again??
- Slow pumping as IFI-IMMT/IMC -> Suspension Monitoring(Takahashi-san + alpha)

KAGRA/IFOIntegration2022/2022OMCClosing (last edited 2022-11-19 09:32:06 by miyoki)

-  ⇤ ← Revision 13 as of 2022-11-18 14:38:59 → 
  Size: 1469
  Editor: miyoki
  Comment:
+   ← Revision 19 as of 2022-11-18 15:14:44 → ⇥
  Size: 2190
  Editor: miyoki
  Comment:
-Deletions are marked like this.
+Additions are marked like this.
 Line 5:
- * OMC (Aso, NAOJ)
  *
+ * [[ https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=14515 | OMC (Aso, NAOJ)]]
  * Higher mode rejection -> OK with good mode matching.
  * New optical board to remove additional structure for resonance dumping.
  * New high-quality mirror. -> 97% T_FP.
  * Replacement of the broken  PD
  * 800 Hz resonance still remains. -> unstable lock in air. Pumping down OMC are will mitigate this resonance.
   * FP_tra estimation in air ~ 0.89 derived by subtracting HOMs power sum from the total power.
  * OMC alignment. OSTM should not be moved by pico to avoid trouble.
  * Dark noise: same btw both PDs.
-Line 18:
+Line 26:
- * OMMT2T optical setting (Ushiba, Akutsu, Miyoki, Sato)
+ * OMMT2T optical setting for sensing OMMT1/SR2 motion separately (Ushiba, Akutsu, Miyoki, Sato, Takahashi)
-Line 33:
+Line 41:
-  * Leak in GV again??
  * Slow pumping as IFI-IMMT/IMC.
+  * Leak in GV_srm-OMM again??
  * Slow pumping as IFI-IMMT/IMC -> Suspension Monitoring(Takahashi-san + alpha)