Noise Subtraction subgroup

Pre-meeting

• Date/Time: Tuesday, November 5th, 2024, 1600-1800 JST (0700-0900 UTC)
• Connection Info.: Zoom1
• Agenda

  • Brief Overview of Noise Subtraction Activities

    • Application to GW experiments/analysis
      • What can be accomplished? How effective is it in improving sensitivity/analysis etc.?

        • Example of NonSENS subtraction at H1, November 2nd, 2024: https://ldas-jobs.ligo-wa.caltech.edu/~detchar/summary/day/20241102/cal/nonsens/#gallery-9

    • Activities at KAGRA (Who?, Project name?, **Features?(What can and what can't be done?)**, Current status?, Future plan?)

      1. Algorithm development
         • ARIMA(AR Integrated MA) : Fujimoto (OCU)

           • JGW-G2112974-v3

         • Liner ICA (Independent Component Analysis) : Yokoyama & Kume (RESCEU), Itoh & Kobayashi (OMU)

           • Ref.: https://doi.org/10.1093/ptep/ptaa056

           • ..

         • Non-liner ICA : Yokoyama & Kume (RESCEU)

           • JGW-G2415951

           • JGW-G2213723

         • DeepClean (CNN) : Yi, Chou, Yeh (NYCU, NTHU)

           • Ref.: https://journals.aps.org/prresearch/abstract/10.1103/PhysRevResearch.2.033066

           • Low-Latency and Offline Deployment

           • KAGRA F2F　Summer 2024 Slides: https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=15977

           • ..

         • LSTM : Itoh & Takatani (OMU)

           • JPS JGW-G2315456-v6

           • Master Thesis JGW-P2415615-v3

         • PINN (Physics-informed neural network) : Dan Chen & Sakemi

           • JPS 2023 Autumn JGW-G2315075

           • JPS 2024 Spring JGW-G2415603

      2. Target noises & Witness channels study

         • AC power 60 Hz and its harmonics
         • Acoustic noise (PSL, IFI, OMC, ...)
         • Other Dofs (CARM, MICH, PRCL)
         • OMC length
         • ASC
         • Beam jitter (IMMT1 trans QPD)
         • VIS
         • Violin mode (w/o Witness channels)
         • CAL lines
         • issue: Safe channel
      3. Computers and Pipelines

         • GPU for offline DeepClean @ Taiwan

         • GPU for online DeepClean @ Kamioka

         • Kashiwa KMST
         • RESCEU
    • Other efforts within LV(K)
      • NonSENS (NON-Stationary Estimation of Noise Subtraction)

        • Derivation and description of algorithm: https://dcc.ligo.org/LIGO-T1800525

          • Estimates the optimal noise subtraction based on witnesses for the noise and witnesses for modulation of the noise coupling
          • Witness channel can be individual channels (linear subtraction), or product of two channels (bilinear subtraction)

        • Codebase: https://git.ligo.org/gabriele-vajente/nonsens

        • Running online at LHO/LLO
          • Front-end implementations:

            • LHO https://git.ligo.org/noisecleaning_o4/frontend-nonsens/lho-online-cleaning

            • LLO https://git.ligo.org/noisecleaning_o4/frontend-nonsens/llo-online-cleaning

          • The output channels are available in the control rooms, for use with commissioning, and are the same channels that analysis pipelines will use.
      • ...

• Scope of the Group to be established

  • Organization?
    • Chia-Jui Chou from Natl. Yang Ming Chiao Tung U. will lead the group as the chief.

    • Will the group encompass all noise subtraction-related activities at KAGRA? (ICA+DeepClean+...)

    • Will the group focus specifically on areas that contribute to the commissioning timeline, i.e., low- or middle-latency?

    • or...
  • Roles/Goals for each phase
    • During the commissioning period prior to participating in O4b observation
    • During the O4b observation
      • Q: Will the cleaned h(t) produced by this team be used as an official deliverable and released to the public?!
    • For future phases O5/O6
  • How collaborate with on-site commissioners/IFO experts?
    • e.g.,

      • Commissioners may request specific noise subtraction, such as subtracting noise in channel-A using auxiliary channel-B?

      • Commissioners may manage a safe channel list?
      • ...
    • What considerations should guide us as we progress? How should we work with the team?
• NOTE: The following terms mean different things. Please use them correctly when discussing:
  • Safe channel, Witness channel, Auxiliary channel, ...
  • Online(front-end), Low-latency, Middle-latency, High-latency, (offline), ...