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| ||[[/Overview]] || [[/Optics]] || [[/CDS]] || [[/Suspensions]] || ||[[Upgrade 09/Optical Layout|/Optical Layout]] || [[/PDs]] ||/GreenLock || || ## page was renamed from Upgrade 08 <<TableOfContents([2])>> |
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| This page describes the big topics in the Upgrade of the 40m interferometer from Mk III to Mk IV. | This is a collection of links relating to the 2009 40m Upgrade. |
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| The main point is to make it more like the AdvLIGO interferometer. There are not too many details on this page so as to not reduce clarity. People should feel free to add comments - This is a workspace for posting ideas, designs and progress for the 2008 40m upgrade. |
== Things to buy == [[Upgrade 09/Purchase List|/Purchase List]] |
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| * [[TAC Meeting-Apr 08]] ([http://lhocds.ligo-wa.caltech.edu:8000/40m/TAC_Meeting-Apr_08?action=AttachFile&do=get&target=Upgrade08.pdf Upgrade08.pdf], or [https://40m.ligo.caltech.edu/svn/40m/docs/upgrade08/ SVN repository]) * [http://lhocds.ligo-wa.caltech.edu:8000/advligo/ISC_Modeling_Software/CVSinstructions?highlight=%28CVS%29 "MIT CVS repository instructions for accessing AdvLIGO modeling"] |
* [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]] |
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== Coatings and Optics == This is a work in progress area for what optic and coatings we need. || Parameter || ITMs || ETMs || PRM || SRM || FM (4x) || || HR Transmission 1064 nm || 0.014|| 10 ppm || || || <0.01 || || HR Transmission 532 nm || < 1000 ppm|| 0.10 || || || || || AR Reflection 1064 nm || 1000 ppm|| < 100 ppm || || || <0.01 || || AR Reflection 532 nm || <0.01|| < 1000 ppm || || || || || ROC || inf|| 40 m? || || || inf|| || Wedge angle || 1 deg || 1 deg || || || || == Arm Cavity Finesse == We will change the transmission of the ITMs from 0.5% to 1.4% to match the new AdvLIGO design. We will also replace the MOS (with 1.25 kg masses) with SOSs. This is to increase the effect of radiation pressure. 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. == 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). Maybe we should match the AdvLIGO Gouy phases. We will make the tip/tilts so that we can have a POP signal. We also keep POX & POY. == 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. == Analog Electronics == === Suspensions === No change of the suspension analog electronics. We will have interface cards/connectors to go from new style ADC/DACs into the old analog electronics. === LSC === New RFPDs for the 9 & 45 MHz as well as 3*f1 (27 MHz). Maybe DD as well. == Cameras == We'll have GigE cameras and an all GigE backbone for all CDS connections. |
= Upgrade of the 40m = * [[Upgrade 09/Overview|Overview of the upgrade]] * '''Overview of the upgrade''' |
<<TableOfContents: execution failed [Argument "maxdepth" must be an integer value, not "[2]"] (see also the log)>>
Upgrade of the 40m
This is a collection of links relating to the 2009 40m Upgrade.
Things to buy
Upgrade document
[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
Overview of the upgrade