Differences between revisions 10 and 11
Revision 10 as of 2014-04-12 06:47:55
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Editor: YoichiAso
Comment:
Revision 11 as of 2014-04-12 06:59:22
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Editor: YoichiAso
Comment:
Deletions are marked like this. Additions are marked like this.
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||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.|| ||
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||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. ||
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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

BRSE, DRSE

Residual frequency noise after the MC. For more detailed discussion, see this.

Relative Intensity Noise

BRSE, DRSE

Beam Jitter

3e-11 rad/rtHz@10Hz, 7e-14 rad/rtHz@100Hz (Safety mergin of 20)

Detail

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.

MIFIOOInterfaces (last edited 2018-10-15 18:51:38 by YutaMichimura)