GroundBIRD: Observing Cosmic Microwave Polarization at Large Angular Scale with Kinetic Inductance Detectors and High-Speed Rotating Telescope

Oguri, S.; Choi, Jihoon; Damayanthi, T.; Hattori, Makoto; Hazumi, M.; Ishitsuka, H.; Karatsu, K.; Mima, Silvana; Minowa, M.; Nagasaki, Taketo; Otani, Chiko; Sekímoto, Yutaro; Tajima, O.; Tomita, Naohide; Yoshida, Masaki; Won, E.

doi:10.1007/s10909-015-1420-9

Cited by 18 publications

(14 citation statements)

References 13 publications

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“…KIDs recently gained a lot of attention as they offer exquisite energy resolution and are naturally multiplexed in the frequency domain, enabling the realization of large arrays monitored with a few readout lines. For this reason, they are now subject of an intense R&D activity for applications in astrophysics [17][18][19][20][21][22][23], in X-ray spectroscopy [24,25], in the search for Dark Matter [26,27], in precision measurements of the coherent elastic neutrino-nucleus scattering [28] and in double-beta decay searches [29][30][31][32][33].…”

Section: Kinetic Inductance Detectors As Proxy For Qubitsmentioning

confidence: 99%

DEMETRA: Suppression of the Relaxation Induced by Radioactivity in Superconducting Qubits

et al. 2019

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Non-equilibrium quasiparticles can deteriorate the performance of superconducting qubits by reducing their coherence. We are investigating a source of quasiparticles that has been too long neglected, namely radioactivity: cosmic rays, environmental radioactivity and contaminants in the materials can all generate phonons of energy sufficient to break Cooper pairs and thus increase the number of quasiparticles. In this contribution, we describe the status of the project and its perspectives.

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Section: Kinetic Inductance Detectors As Proxy For Qubitsmentioning

confidence: 99%

DEMETRA: Suppression of the Relaxation Induced by Radioactivity in Superconducting Qubits

et al. 2019

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“…The GroundBIRD telescope is designed for the precise observation of CMB polarization. The target sensitivity is to constrain the tensor-to-scalar ratio r with a precision of σ r ∼ 0.01 with three year observation [7]. To achieve high enough sensitivity to observe B-modes for large sky coverage, we employ three features: fast rotation scanning, microwave kinetic inductance detector (MKID) and cold optics [6].…”

Section: Overview Of Groundbirdmentioning

confidence: 99%

GroundBIRD: A CMB Polarization Experiment with MKID Arrays

Lee

Choi²,

Génova-Santos

et al. 2020

J Low Temp Phys

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GroundBIRD is a ground-based experiment for the precise observation of the polarization of the cosmic microwave background (CMB). To achieve high sensitivity at large angular scale, we adopt three features in this experiment: fast rotation scanning, microwave kinetic inductance detector (MKID) and cold optics. The rotation scanning strategy has the advantage to suppress 1/ f noise. It also provides a large sky coverage of 40%, which corresponds to the large angular scales of l ∼ 6. This allows us to constrain the tensor-to-scalar ratio by using low l B-mode spectrum. The focal plane consists of 7 MKID arrays for two target frequencies, 145 GHz and 220 GHz band. There are 161 pixels in total, of which 138 are for 144 GHz and 23 are for 220 GHz. This array is currently under development and the prototype will soon be evaluated in telescope. The GroundBIRD telescope will observe the CMB at the Teide observatory. The telescope was moved from Japan to Tenerife and is now under test. We present the status and plan of the GroundBIRD experiment.

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“…Studies for the development of MKIDs are currently spreading around the world. Figure 14 shows a photograph of the MKID array reported by the Otani Group at RIKEN [33][34]. The MKIDs were fabricated of a high quality Al film prepared by the MBE method.…”

Section: Mkids Of Terahertz Wave Detectionmentioning

confidence: 99%

A Thirty-year History of Superconducting Microwave Devices and Fundamental Studies Thereof

Ohshima

2018

J. Phys.: Conf. Ser.

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Abstract. Thirty years have passed since the discovery of high-temperature superconductors (HTS), and practical applications of HTS equipment and devices are moving into full-swing. From the beginning of their discovery, the use of HTS in microwave devices has been recognized as one of their most practical applications. This is because the surface resistance of HTS is about 1/1000 of that of pure copper at 1 GHz and 77 K. From early on, researchers have recognized that high performance of microwave passive devices could be realized by utilizing the characteristics of HTS. In addition, the size of HTS microwave devices is relatively small, and they can be cooled by a small cryocooler. Furthermore, we were able to establish high-quality HTS thin-film fabrication technology essential for producing high performance microwave devices in a short period of time. In view of the above, I would like to present an overview of the past thirty years of superconducting microwave devices and fundamental studies thereof.

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GroundBIRD: Observing Cosmic Microwave Polarization at Large Angular Scale with Kinetic Inductance Detectors and High-Speed Rotating Telescope

Cited by 18 publications

References 13 publications

DEMETRA: Suppression of the Relaxation Induced by Radioactivity in Superconducting Qubits

DEMETRA: Suppression of the Relaxation Induced by Radioactivity in Superconducting Qubits

GroundBIRD: A CMB Polarization Experiment with MKID Arrays

A Thirty-year History of Superconducting Microwave Devices and Fundamental Studies Thereof

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