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Message ID: 768
Entry time: Wed Jul 30 13:14:03 2008
Reply to this: 770
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Author: |
Koji |
Type: |
Summary |
Category: |
IOO |
Subject: |
History of the MC abs length |
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I was notified by Rob and Rana that there were many measurements of the MC abs length (i.e. modulation
frequencies for the IFO.) between 2002 and now.
So, I dig the new and old e-logs and collected the measured values of the MC length, as shown below.
I checked the presence of the vent for two big steps in the MC length. Each actually has a vent.
The elog said that the tilt of the table was changed at the OMC installation in 2006 Oct.
It is told that the MC mirrors were moved a lot during the vent in 2007 Nov.
Note:
o The current modulation freq setting is the highest ever.
o Rob commented that the Marconi may drift in a long time.
o Apparently we need another measurement as we had the big earthquake.
My curiosity is now satified so far.
Local Time 3xFSR[MHz] 5xFSR[MHz] MC round trip[m] Measured by
----------------------------------------------------------------------------
2002/09/12 33.195400 165.977000 27.09343 Osamu
2002/10/16 33.194871 165.974355 27.09387 Osamu
2003/10/10 33.194929 165.974645 27.09382 Osamu
2004/12/14 33.194609 165.973045 27.09408 Osamu
2005/02/11 33.195123 165.975615 27.09366 Osamu
2005/02/14 33.195152 165.975760 27.09364 Osamu
2006/08/08 33.194700 165.973500 27.09401 Sam
2006/09/07 33.194490 165.972450 27.09418 Sam/Rana
2006/09/08 33.194550 165.972750 27.09413 Sam/Rana
----2006/10 VENT OMC installation
2006/10/26 33.192985 165.964925 27.09541 Kirk/Sam
2006/10/27 33.192955 165.964775 27.09543 Kirk/Sam
2007/01/17 33.192833 165.964165 27.09553 Tobin/Kirk
2007/08/29 33.192120 165.960600 27.09611 Keita/Andrey/Rana
----2007/11 VENT Cleaning of the MC mirrors
2007/11/06 33.195439 165.977195 27.09340 Rob/Tobin
2008/07/29 33.196629 165.983145 27.09243 Rob/Yoichi |
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