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Status of KAGRA

This article provides an update on the status of the KAGRA project, including the construction progress, completed test runs, and the roadmap for future phases. It also discusses the observation scenario, hardware configuration, data transfer, sensitivity, and upcoming milestones.

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Status of KAGRA

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  1. Feb 8, 2017 ELiTES 5th general meeting Status of KAGRA Yuta Michimura Department of Physics, University of Tokyo

  2. KAGRA Project • Constructed in Kamioka mine • Underground and cryogenic • 300+ collaborators from 90+ institutes Kamioka

  3. Roadmap of KAGRA • Completed first test run at room temperature.Working for cryogenic test run. • Baseline KAGRA (bKAGRA) in 3 phases. Suspension installation Cryogenics development Cryo. payload installation Cryo. payload upgrade Cool down Cool down IFO upgrade Noise hunting Initial KAGRA Michelson atroom temp. Test run Phase 1 Michelson at cryogenic temp. Test run Phase 2 RSE atroom temp. Test run Phase 3 RSE atcryogenic temp. Observation run

  4. Observation Scenario • With 25-40 Mpc in 2020, 40-140 Mpc in 2021 Living Reviews in Relativity 19, 1 (2016) to be updated

  5. KAGRA Full Configuration ETMY Sapphire 20 K • RSE interferometer • Sapphire test massesat 20 K 3 km IMC ITMY PRM PR2 IFI ITMX ETMX Laser 1064 nm 200 W 3 km BS PR3 SR2 SR3 SRM GW signal

  6. Initial KAGRA Configuration ETMY • 3 km Michelsonat room temperature • Low power • Simplified suspension • At air pressure IMC PR2 IFI ETMX Laser 1064 nm 200 W BS PR3 GW Signal

  7. iKAGRATest Run in 2016 • Period - March 25 to 31 - April 11 to 25 • Purpose - confirm layout of the 3 km vacuum ducts - test controls, data transfer, observation shift, etc. - get environmental data - obtain experiences of the management and operation of the km-class interferometer http://kyodonews.net/news/2016/03/25/54510

  8. iKAGRASensitivity • ~3e-15 /rtHz @ 100 Hz • Limited by seismic noise, acoustic noise andADCnoise • Reductionpossible inbKAGRA seismic noise acoustic noise ADC noise plot by T. Shimoda, M. Nakano, Y. Michimura

  9. Data Transfer • Real time transferto ICRR Kashiwaand Osaka CityUniv. (~3 sec latency, ~ 200 MB/sec) • Delayed mirroringat Academia Sinica, Taiwanand KISTI, Daejeon • 7.5 TB in total figure by N. Kanda

  10. Hardware Injection signal injection • Right after 2nd iKAGRA run • Gravitational waveforms of CBC, Supernovae, etc. • Important end-to-end test Laser Data Acquisition Transfer Analysis GW？

  11. Next step: bKAGRA Phase 1 ETMY Cryogenic sapphire • 3 km Michelson • Sapphire ETMs atcryogenic temperature • Deadline: March 2018 IMC PRM PR2 IFI ETMX Laser 1064 nm 2 W misaligned BS PR3 SR2 SR3 GW signal

  12. bKAGRA Phase 1 Schedule • More suspensions, cryogenics, PSL upgrade PR3 PRM PR2 BS SR2 SR3 ETMY upper ETMX upper ETMY cryo-payload ETMX cryo-payload ETMs coating HCB ETMY cool down PSL upgrade ETMX cool down IMC initial alignment Lock

  13. Suspension Installation ETMY • Test hanging, pre-assembly on-going at the site BS PR3

  14. Cryogenics • Magnetic noise, vibration measurements at cryostats at the site on-going • Cryopayload test at KEK, HCB test at NAOJ • Risk of ETM coating delay (preparing spares) dummy mirror accelerometer ear

  15. Input Optics Upgrade • Input Mode Cleaner (IMC) magnets replaced • Input Mode Matching Telescope (IMMT) suspensions installed • iKAGRA Pre-stabilized Laser (PSL) disassembled,bKAGRA PSL being assembled IMMT1

  16. Summary • Successfully completed the first test run at room temperature (iKAGRA) • Working hard for the first cryogenic test run by March 2018 (bKAGRA Phase 1) • The first observation run in ~2020 • Stay tuned to KAGRA elog (klog)http://klog.icrr.u-tokyo.ac.jp/osl/

  17. Extra Slides

  18. KAGRA Sensitivity • If sapphire mirrors are at 23 K

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