= Viewports (at Room Temperature) = '''''Related subgroups:''''' MIR, IOO, MIF, VAC, CRY, VIS... ---- '''[[KAGRA/Subgroups/AOS| back to AOS top]]''' <> == Scope == . This subsystem provides the optical viewports mounted on the vacuum chambers to pass the optical beams into or from the LCGT in-vacuum interferometer. The optical beams include... . Cryo-vacuum viewports are '''NOT''' included in the scope of this subsystem so far. == Applicable Documents == * Spec. for vacuum chambers * Optical Layout Drawing of the LCGT interferometer * Length Sensing and Control doc * Alignment Sensing and Control doc * Optical lever doc * CCD Monitor doc * Any... == General Description == . At the viewports, we can extract optical beams from the interferometer placed inside the vacuum chambers. The optical beams would be utilized for length and alignment sensing and control scheme, optical levers for suspensions, and other monitoring devices (CCD or equivalent video cameras). . For example, the viewport would be equipped with * AR coating for 1064 nm and 532 nm * Wedge angle . Details are described in ''Characteristics'' section. === Functions === . Beams for * Transmission of IR/Green lasers * Optical Lever transmitter/receiver * Video camera * Illumination * Diagnostic * (Squeeze) * (Spare) === Naming Conventions === . TBD <> === Locations === . Here, the number of viewports required by each subsystem at each vacuum chamber is listed. ||<#FFFF00>Chamber Name||<#FFFF00>Type||<#FFFF00>Quantity||<#FFFF00>Purpose||<#FFFF00>Used By|| ||PRM||1064nm AR||1||REFL port||ISC|| ||PRM||!OpLev wavelength||2||!OpLev||AOS/SUS|| ||PRM ||Visible||1||CCD||Everyone|| ||PR2||1064nm&532 dichroic AR||1 or 2||POP/Green||ISC|| ||PR2||!OpLev wavelength||2||!OpLev||AOS/SUS|| ||PR2 ||Visible||1||CCD||Everyone|| ||PR3||!OpLev wavelength||2||!OpLev||AOS/SUS|| ||PR3 ||Visible||1||CCD||Everyone|| ||BS ||1064nm AR||1||POX/POY beams||ISC|| ||BS ||!OpLev wavelength||2||Optical Lever||AOS/SUS|| ||BS ||Visible||1||CCD||Everyone|| ||ITMX||!OpLev wavelength||2||!OpLev||AOS/SUS|| ||ITMX||Visible||1||CCD||Everyone|| ||ITMY||!OpLev wavelength||2||!OpLev||AOS/SUS|| ||ITMY||Visible||1||CCD||Everyone|| ||ETMX||1064nm&532 dichroic AR||1||Transmission||ISC|| ||ETMX||!OpLev wavelength||2||!OpLev||AOS/SUS|| ||ETMX||Visible||1||CCD||Everyone|| ||ETMY||1064nm&532 dichroic AR||1||Transmission||ISC|| ||ETMY||!OpLev wavelength||2||!OpLev||AOS/SUS|| ||ETMY||Visible||1||CCD||Everyone|| ||SRM||1064nm AR||1||AS port||ISC|| ||SRM||!OpLev wavelength||2||!OpLev||AOS/SUS|| ||SRM ||Visible||1||CCD||Everyone|| ||SR2||1064nm&532 dichroic AR||1 or 2||POS/Green||ISC|| ||SR2||!OpLev wavelength||2||!OpLev||AOS/SUS|| ||SR2 ||Visible||1||CCD||Everyone|| ||SR3||!OpLev wavelength||2||!OpLev||AOS/SUS|| ||SR3 ||Visible||1||CCD||Everyone|| == Requirements == . TBD == Characteristics == . TBD == Inspection plans == . See [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=1231|JGW-T1201231, Effect due to viewports for optical lever (in Japanese)]] == Procurement process and plans == . TBD == External Links == * [[https://dcc.ligo.org/cgi-bin/DocDB/ShowDocument?docid=29666|LIGO-T1000746-v1, Viewports Subsystem Final Design Document]] * [[https://dcc.ligo.org/cgi-bin/DocDB/ShowDocument?docid=13226|LIGO-E1000246, 6.0 inch Vacuum Viewport Specification]] * [[https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?docid=61876|LIGO-T1100292, Viewport Source List]] * [[https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?docid=39955|LIGO-E1100247, Viewport Production Plan]] * [[https://dcc.ligo.org/cgi-bin/DocDB/ShowDocument?docid=8509|LIGO-T1000022-v4, Viewports Subsystem Requirements Document]] * [[https://dcc.ligo.org/cgi-bin/DocDB/ShowDocument?docid=12798|LIGO-T1000334-v1, Review Report Interferometer Sensing and Control Final Design]]