Differences between revisions 20 and 43 (spanning 23 versions)

Output Mode-cleaner

Meetings

Installation work

2018/10-11

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

JGW-G1707050-v1

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/4)

(Jan 30)
- Before 9:00: FPMI realignment (Yokozawa-kun), Preparation for venting (Kimura-san, M.Takahashi-san)
- 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 start 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 Wrok mode at this timing with IMC ASC? or around after all works are done on Jan 30?
  - IP2? HV drift monitoring.
  - Offload of IMC suspensions and IP1/2?
- 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.

-  ⇤ ← Revision 20 as of 2017-11-14 22:49:04 → 
  Size: 1215
  Editor: KentaroSomiya
  Comment:
+   ← Revision 43 as of 2023-01-27 14:03:33 → ⇥
  Size: 3212
  Editor: miyoki
  Comment:
-Deletions are marked like this.
+Additions are marked like this.
 Line 6:
+ * [[KAGRA/Subgroups/IOO/OMC/meeting2018|2018]]

== Installation work ==
 * [[KAGRA/Subgroups/IOO/OMC/installation|2018/10-11]]
-Line 8:
+Line 12:
- * [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=1875|Report by Kumeta]] (Japanese, 2013)
 * [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=2105|Report by Somiya]] (English, 2013)
-Line 11:
+Line 13:
-=== Requirement ===
+ * [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=8043|OMC Design Document]]

 * [[KAGRA/Subgroups/IOO/OMC/DCPDCalculation|DC PD]]

== Requirement ==
-Line 15:
+Line 21:
-=== Optical Design (updated 17/10/25) ===
||item||RoC||Beam Raidus||
||OMMT1||13.16m||4.46mm||
||OMMT2||44.39m||2.68mm||
||OSTM||flat||TBA||
||OMC1||flat||444um||
||OMC2||flat||444um(X)/447um(Y)||
||OMC3||1.80m||604um||
||OMC4||1.80m||604um||
||DCPD||--||562um||
+== 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||||
-Line 37:
+Line 43:
-=== Suspension Design ===
+== Suspension Design ==
-Line 39:
+Line 45:
-TBD
+||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||
-Line 41:
+Line 53:
-=== Control Scheme ===
+ * [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=7050|JGW-G1707050-v1]]
-Line 43:
+Line 55:
-TBD
+== 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/4) ==

 *(Jan 30)
  * Before 9:00: FPMI realignment (Yokozawa-kun), Preparation for venting (Kimura-san, M.Takahashi-san)
  * 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 start 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 Wrok mode at this timing with IMC ASC? or around after all works are done on Jan 30?
   * IP2? HV drift monitoring.
   * Offload of IMC suspensions and IP1/2?
  * 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.