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| == Arm Cavity Finesse == We will change the transmission of the ITMs from 0.5% to 1.4% to match the new AdvLIGO design. |
## page was renamed from Upgrade 08 |
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| We will also replace the MOS (with 1.25 kg masses) with SOSs. This is to increase the effect of radiation pressure. | == Upgrade of the 40m == |
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| We will not fine-tune the coatings of the ITMs for cool dichroic properties unless some coating place gives us a <4 month lead time. | * '''[[/Overview|Overview]]''' * '''Upgrade items & Preparation status''' * [[/Configuration|Configuration]] * [[/Optics|Optics]] * [[/CDS|CDS]] * [[/Suspensions|Suspensions]] * [[/Optical Layout|Optical Layout]] * [[/PDs|RF System]] * [[/Multi_Resonant_EOM|Multi_Resonant_EOM]] * [[/GreenLock|Green Locking]] * [[/Purchase List|Purchase List]] |
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| == Modulation Frequencies == We will change the modulation frequencies from f1=33 MHz and f2 = 166 MHz to f1 = 9 MHz and f2 = 45 MHz. We will increase the length of the MC to accomodate this. == Recycling Cavities == We will increase the length of the RCs to handle the lower modulation frequency. This will require 2 tip/tilt mirrors per cavity. These will be imperial, eddy current damped versions of the ANU tip/tilt mirrors. Should we get new PR and SR or use what we have? (curvature, reflectivity) == Mach Zender == We will not use a Mach Zender. We will use 2-3 EOMs in series or a UF Trimod if it shows up. == Control System Computers == We will have a big multi-core box to run all of the front ends. It will have fast fiber links to remote ADC/DACs. == Multi-wavelength Locking == Make wedges and coatings to accomodate multi-color locking if the lead time is reasonable. The beam from the end should not see the corner. == Optical Levers == Make a fiber based OL delivery scheme. Try to also make 40m long OLs by putting turning mirrors into the vacuum system. |
== Upgrade documents == * [https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?docid=231 Upgrade Doc in DCC] * [http://lhocds.ligo-wa.caltech.edu:8000/advligo/ISC_Modeling_Software/CVSinstructions?highlight=(CVS) "MIT CVS repository instructions for accessing AdvLIGO modeling"] * 40m upgarde plan scrutiny Ver. 9/29/2009 [attachment:upgrade09_090929.pdf [PDF]][attachment:upgrade09_090929.graffle [OmniGraffle]] |
Upgrade of the 40m
Upgrade items & Preparation status
Upgrade documents
[https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?docid=231 Upgrade Doc in DCC]
[http://lhocds.ligo-wa.caltech.edu:8000/advligo/ISC_Modeling_Software/CVSinstructions?highlight=(CVS) "MIT CVS repository instructions for accessing AdvLIGO modeling"]
40m upgarde plan scrutiny Ver. 9/29/2009 [attachment:upgrade09_090929.pdf [PDF]][attachment:upgrade09_090929.graffle [OmniGraffle]]