== July 2010 Meeting of the 40m Technical Advisory Committee ==
[[attachment:TAC_2010_Jul.pdf]]

[[https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?docid=13490|TAC Slides in the DCC]]

July 15th, 2010 <<BR>> 9:00 AM PDT <<BR>> Call in instructions:<<BR>> (866) 380 - 5536<<BR>> International: (816) 249 - 4731<<BR>> Code: 6263958709<<BR>>

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 I. '''Agenda'''  

 I. Current Status / Recent Work   B. Upgrade Plans  

II. '''Recent Status'''

 A. Personnel Changes
  1. Rob Ward: 1/2004 - 3/2010 (gone to Paris - APC / Barsuglia)
  1. [[https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?docid=9237|Rob's Thesis]]

III. '''Upgrade'''

 A. Purpose of the upgrade
  1. AdvLIGO LSC / AdVLIGO testbed (green/CDS)
  1. Advanced techniques

 A. Current status of the upgrade preparation
  1. Mechanics -
   * Done: SOSs for new, light test masses
   * Done: TT suspensions for PRC
    * ANU tip/tilt: LLO Blades + TAMA/ANU compliant eddy current damping
   * Done: In-vac mounts for green
   * To be done: Supplimental parts for TTs, some in-vac mechanics

  1. Optics
   * Done: Have the SRM / ITMs (dichroic). PRMs polished - coating waits for arm loss measurement
   * Done: optical layout
    * MMT design (Jenne): histograms, alignment orthogonality
    * Optics - Gooch & Housego magic HR
   * Done: smaller aux optics, folding mirrors (G&H), and green mirrors, all in hand
   * In progress: ETMs are being polished / coated. ETD = September

  1. Electronics (RF system)
   * Done: Designed the multiple frequency RF system to preserve the phase noise performance of the oscillator
    * RF signal distribution (oscillators, splitters, amplifiers, etc.)
    * Triple-Resonant EOM (New Focus KTP + resonant circuit)
   * 5 of 10 PDs tuned, characterized and made shot noise limited
   * To be done: Finish the remaining 5 PDs / Install the photodiodes on the tables

  1. Green beam injection (unstabilized fiber + green injection from the ends)
   * Done: End table constructed / fringe lock achieved

  1. CDS -
   * Done: Demonstrated the control system of one suspension including the cavity lock.
    * Layout diagram
    * 90% of H/Ws at the 40m
   * To be done: Integration of the system
    * Local control tests
    * Integration tests

  1. PSL laser/table upgrade

 A. Upgrade Plans
  1. upgrading order and rough schedule

IV. End

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 [[attachment:aligocomm.png|{{attachment:aligocomm.png||width=800}}]]