OMC Recover

• 2024-April-25
  • OMC stack status

    • PEM injection test in vacuum:https://docs.google.com/presentation/d/1FWitmSKpKBRjvamsFhZ0Xn4r5zCHdozKv5NXbPgomyQ/edit?usp=sharing

    • PEM isolation evaluation after venting: https://klog.icrr.u-tokyo.ac.jp/osl/?r=29310

      • PEM will do the same thing at IFI to know the healthy stack performance.

    • Visual Inspection: https://klog.icrr.u-tokyo.ac.jp/osl/?r=29259

    • Height inspection: https://klog.icrr.u-tokyo.ac.jp/osl/?r=29262

    • Summary by Takahashi-san: https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=15746

      • OMC-OMT and Optics(Somiya-kun): https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=9819

      • Rubbers(Somiya-kun): メクラブッシュ検査成績書.pdf
  • Stack recovery policy :
    • Change all rubbers inside bellows with harder rubbers.
      • Preparation of rubbers and some parts for replacement (R.Takahashi-san)

        • クロロプレン 84 17 sets -> We need order

        • クロロプレン　
    • Change all thick head bolts to thin head bolts
      • Do we have many such bolts? (R.Takahashi-san)
    • Questions
      • The optical table surface height can be set at the same level as before?

        • --> Just adjust the optical table height adjuster bolts?

      • The whole optics will rotate as a whole compared with before?

        • --> It can happen because the previous sit-on situation cannot always be realized again after each stack weight masses can be separated with each other. If so, all optical axis should be adjusted again in the OMC area?
  • Logistic issues
    • Where should be opened?
      • Bellows duct with TMP should be removed for the final adjustment?
        • If so, it needs temporal stocking space as before.
    • Optical table suspension
      • todo list before suspension
        • Cleaning around OMC and making space for optical-bench with optics.
          • Hut will be taken out the OMC booth to the temporal clean booth.
        • Cables disconnection
        • OMC stage lock and some covering? FC should be applied on the OMC mirrors?
          • fragile PZT cables
        • OFI removal for keeping I-bolts setting?
        • OMMT1, OSM Mirror, and IM fixing
        • Covering for all with something or put floor KOACHs at both sides?
      • How to suspend the whole optical table
        • Suspended Image by crane(Kimura, Node):ＯＭＣ隙間.pdf
        • Suspending Jig:
          • (木村)中央2Ｆ防振室の前に仮保管されているφ980のアルミ板（t=40）の改造を提案されています。必要な穴開け加工と洗浄を黒部市のカナヤママシナリーに追加工依頼することになるかと。
          • (木村)真空槽から定盤を抜き出す際はクレーン揚程の関係で円盤中心の一点吊りになります。一点吊りの状態で定盤荷重のバランスを取るのが難しいため、クレーンのフックと円盤を3点吊りでバランス調整し、一端定盤から円盤を外して円盤を一点吊りに変更する作業が入ります。
      • Where and how is it put after taking out the OMC tank?