Title: ???????????????????
1?????????????????????????????
?? ?, ?? ??, ?? ?? ???? ?????? ?????
2??
??
DECIGO???????????????
??1Hz?
- ?????????????????????????
????????????????
????
????????????????????????
?????410-8/Hz1/2 _at_1kHz(??)?5Hz/Hz1/2 _at_80Hz(???)
31. ????????? 1.1 DECIGO 1.2 ?????????? 1.3
??????????? 2. ?? 3. ?? 4. ?????
41.1 DECIGO
Deci-hertz Interferometer Gravitational Wave
Observatory
- ??1000 km
- ??????10 W
- ??????532 nm
- 0.1Hz1Hz?????????????
- (LISA??????????????)
- ????BH???????????
?????????(100Hz)????????????
DECIGO?????????????????
51.2 ??????????
???????????????????????
?????
?????????????????????????????
FP?????? ??????????????
??????
2??FP?????????????????????
???????????????????????
??TAMA?????
TAMA??????????? p56
61.3 ???????????
- ?????????????????
- ?????????????
- ??????????????????
- ?????????????????????
- ???????????????????
???????????
- ??????????
- ???????
- ?????????
????????????? ?????
??????????????????
71. ????????? 2. ?? 3. ???? 4. ?????
2.5 ????????(??????) 2.6 ???Michelson??? 2.7
??????? 2.8 ??????
2.1 ????? 2.2 ?????? 2.3 ?????? 2.4 ??????
82.1 ?????
- ?????
- PD?????????
- AOM(??????)?????????
- ??????????????
- PD???????????IC(AD587)
- ????
- AOM?????????
- ???????????????
- ???0.62???????
- ??????????
- 3.710-8/Hz1/2
92.2 ??????
- ???Michelson???????
- ??????
- ??????????????
- ??????????
102.3 ??????
- ??????????????????????????
- ?????????
- ??????????Michelson????
- ??????????PZT???????????????
112.4 ??????
Laser power, 10mW Shot noise limit of IMS,
3.710-8/Hz1/2
122.5 ????????(??????)
??????????????????????????????????
- ??????
- ???????????
- ????????
????????
132.6 ???Michelson???
10cm
142.7 ???????
???Michelson?????????????????
- ???????
- 2????
- Eddy current damping
- ???????(10Pa)
152.8 ??????
50cm
161. ????????? 2. ?? 3. ???? 4. ?????
3.1 ??????? 3.2 ??????? 3.3 ???
173.1 ???????
(a) Free-run (b) ??? (c) ??????? (d) 610-7/f
(e) (c)?(d)??
????
- ??310-7/Hz1/2_at_1Hz
- ????????310-7/f1/2?????????
- (310-7/f1/2??????)
- ????????????
- ????AOM driver????
???????????????
1Hz?50dB??????(???????????? )
183.2 ????????
(a) Free-run (b) ??? (c) ???(???)
????
- ?? 20Hz/Hz1/2_at_1Hz
- ???5Hz/Hz1/2
- 200Hz?????????
- ???????
- ?????????
- ??????
- 110Hz?????????????????
- ?????????
- ???????
- 1Hz?????????
- ???????????
- ???????????
- 1Hz?40dB??????
- ????????????????????????????????
- ???????(??)
????LISA????? 30Hz/Hz1/2 _at_1mHz1Hz
193.3 ????
??????
- AOM???????????
- ???????Preamp?
- ????????
- ??????????????
?????
- ??????????????
- ?????
- ???????????
- 1.1Hz(????)
- 1.6Hz(z??)
- 3.5?3.6Hz(Yaw?Pitch??)
- ???
- ??????????
- 10-2Hz/Hz1/2??
201. ????????? 2. ?? 3. ???? 4. ?????
214.1 ?????
_at_1Hz
?? AOM?????????
?????????????????????????
??? ??????????
- AOM??????????
- ???Michelson????????????????????????
- ???????????
- ??????????
22?
232.3 ????(1)
?? DFB????????? (KOHERAS?) ?? 10mW ??
1550nm, ?? lt23kHz ????? 30pm (PZT???)
????? 13pm/K
????? (AOM) ???????????? (BRIMROSE?) RF???
55MHz 1????? ???? 80 (?????)
????? 70 (???)
24????(2)
Photo detector
Isolator
Beam splitter
252.7 ????????????
- ????????????????????????
- ?????????????????
Before
After
262.7 ?????servo????????????
1?????????, DC gain55dB, UGF40kHz, ????45
??? ? ???
272.8 ??????servo?????
1??2???????????? DC gain85dB, UGF2.3kHz,
????45
??? ? ???
282.9 ??????servo????????????
1?????? DC gain70dB, UGF2.6kHz, ????90
??? ? ???
293.2 ?????????
Shot noise Pre amp PD
offset ????
Free run (Monitor signal)
Stabilized
???
303.5 ??????????
Shot noise offset 1 Pre amp
offset2 PD 1
???? PD 2
104
103
???
Free run
102
Stabilized
101
100
10-1
10-2
100
101
102
103
104
10-1
31?????????
???????(????????)
??????
????
????
???????(??????)
5.2
Arm-length noise m/Hz
10-8
UGF??????????
10-9
1/2
10-10
10-11
10-12
??????4Hz/Hz1/2
10-13
10-14
32?????????
Arm-length noise m/Hz
5.2
10-9
Free run
?????????
10-10
1/2
10-11
10-12
10-13
Stabilized
10-14
???
10-15
33?????????
????
110m???
???????
104
- 10Hz100Hz???????????????
- 1Hz?????????????
- 10m?110m?????????????
103
102
101
100
10-1
10-1
100
101
102
103
104
343.4 ????????(2)
100Hz/Hz1/2_at_1Hz
104
Free run
103
??????????
102
Stabilized
101
???
100
??????5Hz/Hz1/2
10-1
UGF
10-2
100
101
102
103
104
10-1