GW7 - Ground-based detectors: from second to third generationm |
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Speaker |
Ushiba, Takafumi |
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Coauthors |
Takafumi; Ushiba, on behalf of the KAGRA collaboration |
| Talk Title |
Status of a Cryogenic Mirror Suspension for KAGRA Gravitational Wave Detector |
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Abstract |
We demonstrated a cryogenic mirror suspension (cryopayload) for a gravitational detector, KAGRA, and evaluated several performances such as cooling time and stability. Cooling mirrors is one of the most effective way for reducing the mirror coating thermal noise, which is fundamentally limits sensitivity of current ground base gravitational wave detectors around 100 Hz region. Cryogenic technology of mirror suspensions is therefore very essential for further improvement of detector sensitivity beyond the 2nd generation detectors such as adv. LIGO, adv. VIRGO, and KAGRA. In the beginning of this May, KAGRA had a test run called bKAGRA-phase1, which is the first trial of a kilometer-scale interferometer with a cryopayload. It takes approximately four weeks to cool a mirror that reached 18 K. Residual angular motions of the cryogenic mirror are 1.5 urad and 1.2 urad for yaw and pitch, respectively. Several injection test had also been performed and this injection data analysis is now ongoing. We will report the status of our cryopayload and result during bKAGRA-phase1. |
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