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| TBA | == Meetings == * [[KAGRA/Subgroups/IOO/OMC/meeting2016|2016]] * [[KAGRA/Subgroups/IOO/OMC/meeting2017|2017]] * [[KAGRA/Subgroups/IOO/OMC/meeting2018|2018]] == Installation work == * [[KAGRA/Subgroups/IOO/OMC/installation|2018/10-11]] == Reports == * [[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 == 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|| * [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=7050|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) == * before 9:00: FPMI realignment (yokozawa) * |
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)
- before 9:00: FPMI realignment (yokozawa)