• TAC_Meeting-Jul_10

July 2010 Meeting of the 40m Technical Advisory Committee

TAC_2010_Jul.pdf

TAC Slides in the DCC

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

1. Agenda

2. Current Status / Recent Work B. Upgrade Plans

II. Recent Status

1. Personnel Changes
   1. Rob Ward: 1/2004 - 3/2010 (gone to Paris - APC / Barsuglia)

   2. Rob's Thesis

III. Upgrade

1. Purpose of the upgrade
   1. AdvLIGO LSC / AdVLIGO testbed (green/CDS)
   2. Advanced techniques
2. 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
   2. 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
   3. 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
   4. Green beam injection (unstabilized fiber + green injection from the ends)
      • Done: End table constructed / fringe lock achieved
   5. 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
   6. PSL laser/table upgrade
3. Upgrade Plans
   1. upgrading order and rough schedule

IV. End