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.?
      • Activities at KAGRA

        • who, what, features, current status, future plan?

          • ICA (Independent Component Analysis)

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

            • ...

          • DeepClean

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

            • Low-Latency and Offline Deployment
          • Other ongoing initiatives?
            • Has each research unit or search pipeline been developing noise subtraction optimized for their specific needs?
      • 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)

          • NonSENS codebase: https://git.ligo.org/gabriele-vajente/nonsens/-/tree/master/nonsens

          • Running online (in the front-end) 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 channel is available in the control room, for use with commissioning, and is the same channel 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 it encompass all noise subtraction-related activities at KAGRA?

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

      • Roles/Goals for each phase
        • during the commissioning period prior to participating in O4b observation
        • during the O4b observation
        • 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 completely different things. Please use them correctly when discussing.
    • -- safe channel, witness channel, auxiliary channel, ...
    • -- online(front-end), low-latency, middle-latency, high-latency, (offline)