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= Upgrade of the 40m =
This page describes the big topics in the Upgrade of the 40m interferometer from Mk III to Mk IV.		 ## page was renamed from Upgrade 08
== Upgrade of the 40m ==
 * '''[[Upgrade 09/Overview|Overview ~]]'''
 * '''Upgrade items & Preparation status'''
  * [[Upgrade 09/Configuration|Optical Configuration]]
   * [[Upgrade 09/Optical Layout|Optical Layout]]
   * [[Upgrade 09/GreenLock|Green Locking]]
  * [[Upgrade 09/Optics|Optics ~]]
   * [[Upgrade 09/Main Optics Phase Maps|Phase Maps of the main mirrors]]
   * [[Optics Cleaning|Optics Cleaning Plan (Dec 2009)]]
   * [[Upgrade 09/MMT09|New Input Mode Matching]]
  * Mechanics
   * [[Upgrade 09/Suspensions|Suspensions ~ SOSs and TTs]]
  * Electronics
   * [[Upgrade 09/RF System|RF System]]
   * [[Upgrade 09/Multi Resonant EOM|Multi Resonant EOM]]
  * [[Upgrade 09/CDS|New CDS]]
  * [[Upgrade 09/Purchase List|Purchase List]]
 * '''[[Upgrade 09/Installation Plan|Installation Plan ~]]'''
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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. == Events ==
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People should feel free to add comments -  * '''Feb 27, 2010:''' [[Power Shortage Feb 27 2010|Power supply stop]]
 * '''Feb 20, 2010:''' [[Power Shortage Feb 2010|Power supply stop]]
 * '''Jan 28, 2010:''' [[TAC_Meeting-Jan_10|TAC meeting Jan 2010]]
 * '''Dec 7-11, 2009:''' [[Optics_Cleaning|Vent for test mass cleaning]]
 * '''Nov 12-17, 2009: ETMY CDS test - Joe, Peter, Koji'''
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This is a workspace for posting ideas, designs and progress for the 2008 40m upgrade. == TAC (Technical Advisory Comittee) meetings ==
 * [[TACs|TAC meetings]]
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== Upgrade document ==
 * [[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"]


== 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 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]]
 * 40m upgarde status Ver. 1/06/2010 [attachment:100106_upgrade09.pdf [PDF]][attachment:100106_upgrade09.graffle [OmniGraffle]]
 * 40m upgrade status (KA, '10 March LVC) [attachment:LVC_March_40m_karai_100315.pdf [PDF]]

Upgrade of the 40m

Events

TAC (Technical Advisory Comittee) meetings

Upgrade documents

Upgrade_09 (last edited 2012-01-03 23:02:41 by localhost)