= Input Faraday Isolator =
 Overview of IFI written by K. Somiya[[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=3537|IFI report]]
 
 Proposal for KAGRA IO Faraday Isolator written by G. Muller and D.B. Tanner [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=3461|Proposal for KAGRA IO Faraday Isolator]]
= Basic Configuration =
 *IFI is seated on the baseplate because the beam hight of KAGRA is different from aLIGO.
 *Ray tracing was calculated by K. Yano [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=4233|Current ray trace around the IFI]]
== Parameter of IFI ==
 * Weight : 18.1kg
 * Size : L=647.7mm, W=177.8mm, H=155.9mm (with bread bord) [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=3538|IFI Drawing]]
{{{#!wiki red/solid'''ATTENTION!'''  
The hight of IFI is different from CAD file}}}
== Parameter of baseplate of IFI ==
 * Weight : 26.9kg
 * Size : L=630mm, W=250mm, H=64.1mm [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=4161|Base of the IFI Drawing]]
= Current Status =
 * IFI was purchased from UF
 * IFI was completed to Assemble on the PSL table in 2015/11
 * Installation was completed in 2015/11
 * Alignment was completed in 2016/02
 * IFI will not be suspended but directly put on the IFI table
 * A pair of unsuspended steering mirrors (STM) have been used for the beam centering

=== Pending Problems ===
 * Total hight of IFI system ( = IFI + Baseplate) is higher than the designed beam hight by 1cm.
 * Is CWP2 replacement needed ?
 * How we test IFI in high power.
 * How to measure the scattering light from IFI and how to dump that ?
 * Connecting IFI to the digital system.
 * Is installing [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=4551|counter masses]] needed ?


== Related documents ==
 *[[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=4822|Slide of JPS meeting in March 22nd 2016 written by Kataoka]]
 *[[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=4822|Slide in 13th f2f meeting written by Kataoka]]
 *[[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=3440|Slide of JPS meeting in March 21st 2015 written by Kataoka]]
 * [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=3295|Slide in 11th f2f meeting written by Yano]]
 * [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=3460|measurement result in Dec.2014]]
 * [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=2104|First Report by Somiya in 2014/1]]
 * [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=2192|Magnetic noise estimation by Somiya]] 
 * [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=2227|Scatter-light noise estimation by Somiya]] 
 * [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=2330|Apperture noise estimation by Somiya]] 
 * [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=2486|IFI Layout by Somiya]] 
 * [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=2474|STM noise by Nakano]]