Confirmation of the current status
The first task of this working group is to establish a consensus between the members about the currently proposed ISC scheme. We will confirm what has been done so far in what degree of detail. Then decide what should be done next.
Parameter |
LCGT BRSE(2004) |
LCGT BRSE(2009) |
LCGT DRSE(2009) |
units |
Wave length |
1064 |
1064 |
0164 |
nm |
Initial Laser Power |
300 |
|
|
W |
Injecting Laser Power into IFO |
150 |
75 |
75 |
W |
Modulation depth |
0.1 |
|
|
|
RF freq 1 |
9.98125(PM) |
|
|
MHz |
RF freq 2 |
59.8875(AM) |
|
|
MHz |
1st MC length |
9.755 |
|
|
m |
2nd MC length |
180.463 |
|
|
m |
1st MC FSR |
15.525 |
|
|
MHz |
2nd MC FSR |
0.831771 |
|
|
MHz |
1st MC Finesse |
1720 |
|
|
MHz |
2nd MC Finesse |
1000 |
|
|
MHz |
|
|
|
|
|
EM Reflectivity |
0.99995 |
|
|
|
FM Reflectivity |
0.995 |
|
|
|
PRM Reflectivity |
0.76 |
|
|
|
SRM Reflectivity |
0.68 |
|
|
|
BS Reflectivity |
0.5 |
|
|
|
EM Transmissivity |
2e-5 |
|
|
|
FM Transmissivity |
0.00497 |
|
|
|
PRM Transmissivity |
0.23997 |
|
|
|
SRM Transmissivity |
0.31997 |
|
|
|
BS Transmissivity |
0.49997 |
|
|
|
EM Loss |
3e-5 |
|
|
|
FM Loss |
3e-5 |
|
|
|
PRM Loss |
3e-5 |
|
|
|
SRM Loss |
3e-5 |
|
|
|
BS Loss |
3e-5 |
|
|
|
|
|
|
|
|
Arm cavity length |
3000 |
|
|
m |
PR cavity length |
45 |
|
|
m |
PRM-BS length |
Not defined |
|
|
m |
BS-FM X length |
Not defined |
|
|
m |
BS-FM Y length |
Not defined |
|
|
m |
Asymmetry length |
7.5 |
|
|
m |
SR cavity length |
45 |
|
|
m |
SRM-BS length |
Not determined |
|
|
m |
SRC detuning phase |
N/A |
N/A |
|
degree |
|
|
|
|
|
Arm cavity FSR |
0.05 |
|
|
MHz |
PRC cavity FSR |
6.7 |
|
|
MHz |
SRC cavity FSR |
6.7 |
|
|
MHz |
|
|
|
|
|
Arm cavity Finesse |
1250 |
|
|
|
Arm power gain |
796 |
|
|
|
Arm power |
0.796 |
|
|
MW |
PR gain |
10 |
|
|
|
SR gain |
10 |
|
|
|
MICH contrast |
0.995 |
|
|
|
|
|
|
|
|
EM mass |
50.9 |
|
|
kg |
FM mass |
50.9 |
|
|
kg |
PRM mass |
Not defined |
|
|
kg |
SRM mass |
Not defined |
|
|
kg |
BS mass |
Not defined |
|
|
kg |
|
|
|
|
|
EM ROC |
4500 |
|
|
m |
FM ROC |
Infinity |
|
|
m |
PRM ROC |
3e5 |
|
|
m |
SRM ROC |
Not defined |
|
|
m |
BS ROC |
Infinity |
|
|
m |
|
|
|
|
|
EM AR Reflectivity |
Not defined |
|
|
|
FM AR Reflectivity |
Not defined |
|
|
|
PRM AR Reflectivity |
Not defined |
|
|
|
SRM AR Reflectivity |
Not defined |
|
|
|
BS AR Reflectivity |
Not defined |
|
|
|
EM AR Loss |
Not defined |
|
|
|
FM AR Loss |
Not defined |
|
|
|
PRM AR Loss |
Not defined |
|
|
|
SRM AR Loss |
Not defined |
|
|
|
BS AR Loss |
Not defined |
|
|
|
|
|
|
|
|
EM absorption loss |
20 |
|
|
ppm/cm |
FM absorption loss |
20 |
|
|
ppm/cm |
PRM absorption loss |
5 |
|
|
ppm/cm |
SRM absorption loss |
5 |
|
|
ppm/cm |
BS absorption loss |
5 |
|
|
ppm/cm |
EM thickness |
18 |
|
|
cm |
FM thickness |
18 |
|
|
cm |
PRM thickness |
Not defined |
|
|
cm |
SRM thickness |
Not defined |
|
|
cm |
BS thickness |
Not defined |
|
|
cm |
EM bulk Loss |
1000 |
|
|
ppm |
FM bulk Loss |
1000 |
|
|
ppm |
PRM bulk Loss |
1000 |
|
|
ppm |
SRM bulk Loss |
1000 |
|
|
ppm |
BS bulk Loss |
1000 |
|
|
ppm |
|
|
|
|
|
|
|
|
|
|
OMC input/output mirror reflectivity |
0.8 |
|
|
|
OMC end mirror reflectivity |
0.99995 |
|
|
|
OMC length |
0.07 |
|
|
m |
OMC MC FSR |
4282 |
|
|
MHz |
OMC Finesse |
14 |
|
|
MHz |
Length Sensing Scheme Review by Somiya (Japanese) lcgtrse.pdf
Length Sensing Scheme Review for advLIGO by Somiya AdvLIGO-LSCv4.pdf
I tried to log in but I'm not sure if I am in, so in case, this is Fumiko 
Here I put some kat files I used for calculating LCGT signal matrix. LCGT.kat has all the parameters that are used. Note that it was written more than a year ago, and they are not updated. I will list these parameters when I can here, outside the kat file but for now I just attach some files. Also note that they are the same as what Andreas Freise has, because I made these when he needed to collect some LCGT parameters and some kat files and so on. Maybe Koji remembers about him contacting us about a year ago, do you??
Here I have three kat files with three m. files and what do they do?
- : With contourplot.m, it is used to make contourplots of error signals.
- : With demphase.m it is used to create a text file "phase.txt"
- which shows demodulation phase that procuces maximum signals.
- :With signalmatrix.m, it is used to create two text files, "matrix_raw.txt" and "matrix_norm.txt" which show signal matrix with raw values and normalized valies respectively.
ok, now I try to attach files hope it works like this...hm.