Advanced LIGO Operations Support

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The UK Operations program allows continued involvement in the Advanced LIGO gravitational wave detectors, and related data analysis. Continuation of this work enables UK scientists to participate in the rich and exciting science produced by the global network of gravitational wave detectors. The proposal has three work packages (WP) as follows: WP1 - support for LIGO Scientific Collaboration (LSC) detector operations. This provides for continuing UK involvement in the activities of commissioning, operation, detector characterisation and data analysis for the Advanced LIGO detectors. WP2 - support for operation of UK-provided hardware (Advanced LIGO detector components). This provides for the required on-site UK effort to prepare and optimise suspension fibres for newly installed mirrors and to weld mirrors to their suspensions, together with related on-site and off-site support. This work package also provides for optimisation and characterisation of related detector components. WP3 - computational infrastructure and data storage. This provides for the maintenance and operation of the UK's major gravitational wave data analysiscompute resource at Cardiff. The current facility, recently upgraded, shall provide the UK share of compute resources until completion of O4 data analysis. The richness of science from GW observation is manifest with discoveries now made at a rate of about one per week, so continued participation in computing for data analysis (DA) is critical for the UK contribution.