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For construction of the third generation detectors

For construction of the third generation detectors. Daisuke Tatsumi National Astronomical Observatory of Japan. TAMA R&D status. CLIO R&D status. As presented in the previous talks, we archived to exceed the thermal noise limited sensitivity in room-temperature by cooling the mirrors.

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For construction of the third generation detectors

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  1. For construction of the third generation detectors Daisuke Tatsumi National Astronomical Observatory of Japan

  2. TAMA R&D status

  3. CLIO R&D status • As presented in the previous talks,we archived to exceed the thermal noise limited sensitivity in room-temperature by cooling the mirrors. • It is the beginning of the third generation. keywords: cryogenics, underground

  4. Contents Based on the developments and commission of both TAMA and CLIO, I would like to think about what is necessary for construction of the third generation detectors.

  5. Reliabilitiesfor GW observations An example: seismic motion monitoring The third generation detectors will obtain the better sensitivities in the low frequency region. In such a situation, it is more important to monitor seismic motions. At the CLIO site, laser strain-meter and super-conducting gravimeter are monitored the seismic motions very precisely.

  6. Reliabilitiesfor GW observations The key-point is to measure the physical quantities very precisely. • absolute length of the cavities • shear motions of two arm cavities • gravity constant of the site By collaborating with geo-scientists, we can also investigate the details of local fluctuations of gravity at the site. It will increase the reliability of GW detections.

  7. Reliabilities for interferometer operation While the interferometers were commissioned, various troubles to disturb stable and good sensitivity operation were happened. To help understand the detector quantitatively, detector simulators is important. Toward the third generation, complicacy of the detector will increase.

  8. Reliabilities for interferometer operation In the field of High Energy Physics, full detector simulators, which emulate elemental steps of each components, are used not only for detector development but also for analysis. GW full detector simulator of time domain requires more realistic modeling of each detector components. Future huge computing power will realize it.

  9. Good materials As demonstrating by CLIO, cryogenics and underground environment increase the detector potential. Similar to that, the good materials will open a door to the new stage beyond the updating second generation detectors.

  10. Good materials • optical materials (low loss, low thermal gradient of substrates, crystals and/or coatings) • mechanical materials (low-mechanical loss and/or high conductivitywith huge volume)

  11. Summary The third generation is just the beginning. We need more investigations for construction of these and for breaking through these. It is great pleasure for us to discuss the recent progress and developments in this conference at Kyoto.

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