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Size: 2293
Comment:
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Size: 3011
Comment:
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| Deletions are marked like this. | Additions are marked like this. |
| Line 8: | Line 8: |
| ||Frequency Noise Requirement ||To be calculated from the viewpoint of lock acquisition. ||Residual frequency noise after the MC. || | ||Frequency Noise ||To be calculated from the viewpoint of lock acquisition. ||Residual frequency noise after the MC. || ||Relative Intensity Noise||To be calculated from the viewpoint of lock acquisition.|| || |
| Line 17: | Line 18: |
| ||Frequency Noise Requirement ||[[https://granite.phys.s.u-tokyo.ac.jp/svn/LCGT/trunk/mif/doc/DesignDocument/plots/MCFreqReq-BRSE.pdf|BRSE]], [[https://granite.phys.s.u-tokyo.ac.jp/svn/LCGT/trunk/mif/doc/DesignDocument/plots/MCFreqReq-DRSE.pdf|DRSE]] ||Residual frequency noise after the MC. For more detailed discussion, see [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/DocDB/ShowDocument?docid=2302|this]]. || | ||Frequency Noise ||[[https://granite.phys.s.u-tokyo.ac.jp/svn/LCGT/trunk/mif/doc/DesignDocument/plots/MCFreqReq-BRSE.pdf|BRSE]], [[https://granite.phys.s.u-tokyo.ac.jp/svn/LCGT/trunk/mif/doc/DesignDocument/plots/MCFreqReq-DRSE.pdf|DRSE]] ||Residual frequency noise after the MC. For more detailed discussion, see [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/DocDB/ShowDocument?docid=2302|this]]. || ||Relative Intensity Noise||[[https://granite.phys.s.u-tokyo.ac.jp/svn/LCGT/trunk/mif/doc/DesignDocument/plots/RINReq-BRSE.pdf|BRSE]], [[https://granite.phys.s.u-tokyo.ac.jp/svn/LCGT/trunk/mif/doc/DesignDocument/plots/RINReq-DRSE.pdf|DRSE]]|| || |
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| ||<tablewidth="923px" tableheight="174px">Name ||Frequency ||Type ||Mod. index ||Relative Amplitude to Carrier before PRM ||Comment || ||f1 ||16.880961MHz ||PM ||0.15rad || || || ||f2 ||45.0159MHz ||PM ||0.05rad || || || ||f3 ||56.2699MHz ||AM ||0.05rad || ||Non-resonant sidebands to be used only for lock acquisition. || |
||<tablewidth="923px" tableheight="174px">Name ||Frequency ||Type ||Mod. index ||Relative Amplitude to Carrier before PRM ||Oscillator Phase Noise||Oscillator Amplitude Noise||Comment || ||f1 ||16.880961MHz ||PM ||0.15rad || ||BRSE, DRSE|| || || ||f2 ||45.0159MHz ||PM ||0.05rad || || || || || ||f3 ||56.2699MHz ||AM ||0.05rad || || || ||Non-resonant sidebands to be used only for lock acquisition. || |
| Line 34: | Line 36: |
| Assumed modulator arrangement | === Assumed modulator arrangement === In the Optickle modeling, f1, f2 and f3 modulations are applied in series in this order. Optickle can properly handle the generation of sidebands on sidebands. So it is confirmed that series modulation is OK for bKAGRA. In practice, it may be better to apply f3 modulation first. This is to be discussed with IOO. |
MIF's Interface with IOO
Carrier
iKAGRA
Wavelength |
1064nm |
Comment |
Power |
>500mW at PRM AR |
|
Polarization |
S |
|
Complex beam radius at the PRM AR |
9.8358048093144834+i*18.307397678406861 |
So called q-parameter in the unit of m. Although there is no PRM in iKAGRA, this is a beam parameter at the position where the AR surface of the PRM will be located in bKAGRA. This parameter gives the perfect mode match to the iKAGRA arm cavities. However, the MIF does not require IOO to provide 100% mode matching in iKAGRA phase. |
Frequency Noise |
To be calculated from the viewpoint of lock acquisition. |
Residual frequency noise after the MC. |
Relative Intensity Noise |
To be calculated from the viewpoint of lock acquisition. |
|
Beam Jitter |
To be calculated from the viewpoint of lock acquisition. |
|
bKAGRA
Wavelength |
1064nm |
Comment |
Power |
75W at PRM AR |
|
Polarization |
S |
|
Complex beam radius at the PRM AR |
-10.580258464886768+i*56.648923633432595 |
So called q-parameter in the unit of m. |
Frequency Noise |
Residual frequency noise after the MC. For more detailed discussion, see this. |
|
Relative Intensity Noise |
|
|
Beam Jitter |
3e-11 rad/rtHz@10Hz, 7e-14 rad/rtHz@100Hz (Safety mergin of 20) |
Modulations
iKAGRA
Name |
Freqency |
Type |
Mod. index |
Relative Amplitude to Carrier before PRM |
Comment |
f1 |
16.880961MHz |
PM |
0.1rad |
|
|
bKAGRA
Name |
Frequency |
Type |
Mod. index |
Relative Amplitude to Carrier before PRM |
Oscillator Phase Noise |
Oscillator Amplitude Noise |
Comment |
f1 |
16.880961MHz |
PM |
0.15rad |
|
BRSE, DRSE |
|
|
f2 |
45.0159MHz |
PM |
0.05rad |
|
|
|
|
f3 |
56.2699MHz |
AM |
0.05rad |
|
|
|
Non-resonant sidebands to be used only for lock acquisition. |
Assumed modulator arrangement
In the Optickle modeling, f1, f2 and f3 modulations are applied in series in this order. Optickle can properly handle the generation of sidebands on sidebands. So it is confirmed that series modulation is OK for bKAGRA. In practice, it may be better to apply f3 modulation first. This is to be discussed with IOO.