TiO2 doping effect on reflective coating mechanical loss for gravitational wave detection at low temperature

Yukino Mori; Yota Nakayama; Kazuhiro Yamamoto; Takafumi Ushiba; Danièle Forest; Christophe Michel; Laurent Pinard; Julien Teillon; Gianpietro Cagnoli

doi:10.1103/PhysRevD.109.102008

TiO2 doping effect on reflective coating mechanical loss for gravitational wave detection at low temperature

Yukino Mori, Yota Nakayama, Kazuhiro Yamamoto, Takafumi Ushiba, Danièle Forest, Christophe Michel, Laurent Pinard, Julien Teillon, Gianpietro Cagnoli

Program of Physics

Research output: Contribution to journal › Article › peer-review

1 Scopus citations

Abstract

We measured the mechanical loss of a dielectric multilayer reflective coating (ion-beam-sputtered SiO2 and Ta2O5) with and without TiO2 mixed into the Ta2O5 layers on sapphire disks between 6 and 77 K. The measured loss angle exhibited a temperature dependence, and the local maximum was found at approximately 20 K. This maximum was 7.0×10-4 (with TiO2) and 7.7×10-4 (without TiO2), although the previous measurement for the coating on sapphire disks showed almost no temperature dependence [Phys. Rev. D 74, 022002 (2006)PRVDAQ1550-799810.1103/PhysRevD.74.022002]. We evaluated the coating thermal noise in KAGRA and discussed future investigation strategies.

Original language	English
Article number	102008
Journal	Physical Review D
Volume	109
Issue number	10
DOIs	https://doi.org/10.1103/PhysRevD.109.102008
State	Published - 2024/05/15

ASJC Scopus subject areas

Nuclear and High Energy Physics

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10.1103/PhysRevD.109.102008

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title = "TiO2 doping effect on reflective coating mechanical loss for gravitational wave detection at low temperature",

abstract = "We measured the mechanical loss of a dielectric multilayer reflective coating (ion-beam-sputtered SiO2 and Ta2O5) with and without TiO2 mixed into the Ta2O5 layers on sapphire disks between 6 and 77 K. The measured loss angle exhibited a temperature dependence, and the local maximum was found at approximately 20 K. This maximum was 7.0×10-4 (with TiO2) and 7.7×10-4 (without TiO2), although the previous measurement for the coating on sapphire disks showed almost no temperature dependence [Phys. Rev. D 74, 022002 (2006)PRVDAQ1550-799810.1103/PhysRevD.74.022002]. We evaluated the coating thermal noise in KAGRA and discussed future investigation strategies.",

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T1 - TiO2 doping effect on reflective coating mechanical loss for gravitational wave detection at low temperature

AU - Mori, Yukino

AU - Nakayama, Yota

AU - Yamamoto, Kazuhiro

AU - Ushiba, Takafumi

AU - Forest, Danièle

AU - Michel, Christophe

AU - Pinard, Laurent

AU - Teillon, Julien

AU - Cagnoli, Gianpietro

PY - 2024/5/15

Y1 - 2024/5/15

N2 - We measured the mechanical loss of a dielectric multilayer reflective coating (ion-beam-sputtered SiO2 and Ta2O5) with and without TiO2 mixed into the Ta2O5 layers on sapphire disks between 6 and 77 K. The measured loss angle exhibited a temperature dependence, and the local maximum was found at approximately 20 K. This maximum was 7.0×10-4 (with TiO2) and 7.7×10-4 (without TiO2), although the previous measurement for the coating on sapphire disks showed almost no temperature dependence [Phys. Rev. D 74, 022002 (2006)PRVDAQ1550-799810.1103/PhysRevD.74.022002]. We evaluated the coating thermal noise in KAGRA and discussed future investigation strategies.

AB - We measured the mechanical loss of a dielectric multilayer reflective coating (ion-beam-sputtered SiO2 and Ta2O5) with and without TiO2 mixed into the Ta2O5 layers on sapphire disks between 6 and 77 K. The measured loss angle exhibited a temperature dependence, and the local maximum was found at approximately 20 K. This maximum was 7.0×10-4 (with TiO2) and 7.7×10-4 (without TiO2), although the previous measurement for the coating on sapphire disks showed almost no temperature dependence [Phys. Rev. D 74, 022002 (2006)PRVDAQ1550-799810.1103/PhysRevD.74.022002]. We evaluated the coating thermal noise in KAGRA and discussed future investigation strategies.

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TiO2 doping effect on reflective coating mechanical loss for gravitational wave detection at low temperature

Abstract

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