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Photon Calibration Performance of KAGRA during the 4th Joint Observing Run (O4)
Dan Chen, Shingo Hido, Darkhan Tuyenbayev +9
KAGRA is a kilometer-scale cryogenic gravitational-wave (GW) detector in Japan. It joined the 4th joint observing run (O4) in May 2023 in collaboration with the Laser Interferomete…
The POLARBEAR-2 and Simons Array Focal Plane Fabrication Status
B. Westbrook, P. A. R. Ade, M. Aguilar +90
We present on the status of POLARBEAR-2 A (PB2-A) focal plane fabrication. The PB2-A is the first of three telescopes in the Simon Array (SA), which is an array of three cosmic mic…
Development of epoxy-based millimeter absorber with expanded polystyrenes and carbon black
Yuki Inoue, Masaya Hasegawa, Masashi Hazumi +2
We recently developed and characterized an absorber for millimeter wavelengths. To absorb the millimeter wave efficiently, we need to develop the low reflection and high absorption…
Response of the underground environment of the KAGRA observatory against the air-pressure disturbance from the Tonga volcano eruption on January 15th, 2022
T. Washimi, T. Yokozawa, A. Takamori +11
On January 15, 2022, at 04:14:45 (UTC), the Hunga Tonga-Funga Ha'apai, a submarine volcano in the Tongan archipelago in the southern Pacific Ocean, erupted and generated global sei…
Performance of the KAGRA detector during the first joint observation with GEO 600 (O3GK)
KAGRA Collaboration, H. Abe, R. X. Adhikari +212
KAGRA, the kilometer-scale underground gravitational-wave detector, is located at Kamioka, Japan. In April 2020, an astrophysics observation was performed at the KAGRA detector in…
Application of the independent component analysis to the iKAGRA data
KAGRA Collaboration, T. Akutsu, M. Ando +244
We apply the independent component analysis (ICA) to the real data from a gravitational wave detector for the first time. Specifically we use the iKAGRA data taken in April 2016, a…
First cryogenic test operation of underground km-scale gravitational-wave observatory KAGRA
KAGRA Collaboration, T. Akutsu, M. Ando +198
KAGRA is a second-generation interferometric gravitational-wave detector with 3-km arms constructed at Kamioka, Gifu in Japan. It is now in its final installation phase, which we c…
Improving the absolute accuracy of the gravitational wave detectors by combining the photon pressure and gravity field calibrators
Yuki Inoue, Sadakazu Haino, Nobuyuki Kanda +5
The absolute accuracy of the estimated parameters of gravitational wave sources will be fundamentally limited by the calibration uncertainties of the detectors in upcoming observat…
The LiteBIRD Satellite Mission - Sub-Kelvin Instrument
A. Suzuki, P. A. R. Ade, Y. Akiba +149
Inflation is the leading theory of the first instant of the universe. Inflation, which postulates that the universe underwent a period of rapid expansion an instant after its birth…
POLARBEAR-2: an instrument for CMB polarization measurements
Y. Inoue, P. Ade, Y. Akiba +83
POLARBEAR-2 (PB-2) is a cosmic microwave background (CMB) polarization experiment that will be located in the Atacama highland in Chile at an altitude of 5200 m. Its science goals…
Two-layer anti-reflection coating with mullite and polyimide foam for large-diameter cryogenic infrared filters
Yuki Inoue, Takaho Hamada, Masaya Hasegawa +8
We have developed a novel two-layer anti-reflection (AR) coating method for large-diameter infrared (IR) filters made of alumina, for the use at cryogenic temperatures in millimete…
The POLARBEAR-2 and the Simons Array Experiment
A. Suzuki, P. Ade, Y. Akiba +86
We present an overview of the design and status of the \Pb-2 and the Simons Array experiments. \Pb-2 is a Cosmic Microwave Background polarimetry experiment which aims to character…
Modeling atmospheric emission for CMB ground-based observations
J. Errard, P. A. R. Ade, Y. Akiba +72
Atmosphere is one of the most important noise sources for ground-based cosmic microwave background (CMB) experiments. By increasing optical loading on the detectors, it amplifies t…
Development and characterization of the readout system for POLARBEAR-2
D. Barron, P. A. R. Ade, Y. Akiba +69
POLARBEAR-2 is a next-generation receiver for precision measurements of the polarization of the cosmic microwave background (Cosmic Microwave Background (CMB)). Scheduled to deploy…
Mission design of LiteBIRD
T. Matsumura, Y. Akiba, J. Borrill +66
LiteBIRD is a next-generation satellite mission to measure the polarization of the cosmic microwave background (CMB) radiation. On large angular scales the B-mode polarization of t…
Cryogenic infrared filter made of alumina for use at millimeter wavelength
Yuki Inoue, Tomotake Matsumura, Masashi Hazumi +5
We propose a high thermal conductivity infrared (IR) filter using alumina for use in millimeter wave detection systems. We constructed a prototype two-layer anti-reflection (AR) co…
Adaptation of frequency-domain readout for Transition Edge Sensor bolometers for the POLARBEAR-2 Cosmic Microwave Background experiment
Kaori Hattori, Kam Arnold, Darcy Barron +13
The POLARBEAR-2 CosmicMicrowave Background (CMB) experiment aims to observe B-mode polarization with high sensitivity to explore gravitational lensing of CMB and inflationary gravi…
The bolometric focal plane array of the Polarbear CMB experiment
K. Arnold, P. A. R. Ade, A. E. Anthony +53
The Polarbear Cosmic Microwave Background (CMB) polarization experiment is currently observing from the Atacama Desert in Northern Chile. It will characterize the expected B-mode p…
The POLARBEAR Experiment
Z. Kermish, P. Ade, A. Anthony +53
We present the design and characterization of the POLARBEAR experiment. POLARBEAR will measure the polarization of the cosmic microwave background (CMB) on angular scales ranging f…
The new generation CMB B-mode polarization experiment: POLARBEAR
The Polarbear Collaboration, J. Errard, P. A. R. Ade +43
We describe the Cosmic Microwave Background (CMB) polarization experiment called Polarbear. This experiment will use the dedicated Huan Tran Telescope equipped with a powerful 1,20…