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Coating development and plans for filter cavity tests at TAMA

Coating development and plans for filter cavity tests at TAMA. Daisuke TATSUMI National Astronomical Observatory of Japan. Filter cavity. Squeezing Light and Filter cavity. S queezed vacuum injection is one of promising way to reduce the detector noises.

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Coating development and plans for filter cavity tests at TAMA

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  1. Coating development and plans for filter cavity tests at TAMA Daisuke TATSUMI National Astronomical Observatory of Japan KAGRA f2fAugust 2014

  2. Filter cavity

  3. Squeezing Light and Filter cavity Squeezed vacuum injection is one of promising way to reduce the detector noises. As a R&D activity for beyond the KAGRA detector, we have a plan to develop the filter cavity at TAMA.

  4. A demonstration by eLIGO 2dB

  5. Frequency independent squeezing

  6. Solution: Filter Cavity

  7. Frequency dependent squeezing

  8. Loss requirement (2)

  9. Loss requirements

  10. Rough design of the filter cavity Cavity pole freq. = 40Hz Roundtrip Loss < 1ppm/m Cavity length 10m 300m Finesse 4E+5 4E+4 Mirror reflectance5N=99.999% 4N=99.99% Cavity Loss 10ppm 300ppm

  11. Coating developments

  12. Low loss mirror developments NAOJ and UEC (Univ. of Electro-Communications) collaborate with Japanese coating companies for low-loss mirror coating developments.

  13. Cross section of the multi-layered coating The films have clear edges. Each layer is dense and uniform. Pictures are taken by TEM microscope in Univ. of Tokyo

  14. X-ray Photoelectron Spectroscopy：XPS Argon ion gun Soft X-ray Neutralizer Soft X-ray

  15. X-ray Photoelectron Spectroscopy：XPS Ta2O5 film O 1s O 2s Ta 4d5 O KLL measured by A. Ueda at Institute of Engineering Innovations, University of Tokyo

  16. Scattering Loss world top class quality! Ave.8.0ppm coated by SigmaKoki

  17. Damage Threshold At least the best performance in Japan 446 J/cm2 with 10nsec pulse  44.6 GW/cm2(peak power density) This is tolerance for one shot pulse. KAGRA IOO requires high power density (> 1 MW/cm2) tolerance for 10 year continuous operation.

  18. SUMMARY Recent few years we develop low-loss mirror with Japanese companies. By using the mirror the filter cavity tests at TAMA are planned.

  19. End

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