GroundBIRD: Observation of CMB Polarization with a Rapid Scanning and MKIDs

Nagasaki, Taketo; Choi, Jihoon; Génova-Santos, R. T.; Hattori, Makoto; Hazumi, M.; Ishitsuka, H.; Karatsu, K.; Kikuchi, K.; Koyano, Ryo; Kutsuma, Hiroki; Lee, K.; Mima, Silvana; Minowa, M.; Nagai, Makoto; Naruse, Mitsuhide; Oguri, S.; Otani, Chiko; Rebolo, R.; Rubiño-Martín, J. A.; Sekímoto, Yutaro; Semoto, Munehisa; Suzuki, Junya; Taino, Tohru; Tajima, O.; Tomita, Naohide; Uchida, Tomohisa; Won, E.; Yoshida, Masaki

doi:10.1007/s10909-018-2077-y

Cited by 8 publications

(10 citation statements)

References 12 publications

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“…There are multiple CMB B-mode experiments ongoing and in late planning phases at the moment, and MKIDs are considered for several of them and already utilized in some. GroundBIRD [77][78][79] is searching for the CMB B-mode polarization with a 30 cm telescope that rotates rapidly (about 20 rounds per minute) on a horizontal platform to enhance noise suppression. It uses 161 MKID pixels in two bands centered around 145 GHz (2.1 mm, 138 pixels) and 220 GHz (1.4 mm, 23 pixels) and will start observing from Teide Observatory, Tenerife soon.…”

Section: Mkid Mid-ir To Microwave Imagersmentioning

confidence: 99%

Applications for Microwave Kinetic Induction Detectors in Advanced Instrumentation

2021

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In recent years Microwave Kinetic Inductance Detectors (MKIDs) have emerged as one of the most promising novel low temperature detector technologies. Their unrivaled scalability makes them very attractive for many modern applications and scientific instruments. In this paper we intend to give an overview of how and where MKIDs are currently being used or are suggested to be used in the future. MKID based projects are ongoing or proposed for observational astronomy, particle physics, material science and THz imaging, and the goal of this review is to provide an easily usable and thorough list of possible starting points for more in-depth literature research on the many areas profiting from kinetic inductance detectors.

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Section: Mkid Mid-ir To Microwave Imagersmentioning

confidence: 99%

Applications for Microwave Kinetic Induction Detectors in Advanced Instrumentation

2021

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“…( 3). This method requires that X system is lower than the contribution of the first term in Eq (5). Moreover, another contribution due to a two level system noise 20 should be low enough in the case of the phase response.…”

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A method to measure superconducting transition temperature of microwave kinetic inductance detector by changing power of readout microwaves

et al. 2020

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A microwave kinetic inductance detector (MKID) is a cutting-edge superconducting detector, and its principle is based on a superconducting resonator circuit. The superconducting transition temperature (Tc) of the MKID is an important parameter because various MKID characterization parameters depend on it. In this paper, we propose a method to measure the Tc of the MKID by changing the applied power of the readout microwaves. A small fraction of the readout power is deposited on the MKID, and the number of quasiparticles in the MKID increases with this power. Furthermore, the quasiparticle lifetime decreases with the number of quasiparticles. Therefore, we can measure the relation between the quasiparticle lifetime and the detector response by rapidly varying the readout power. From this relation, we evaluate the intrinsic quasiparticle lifetime. This lifetime is theoretically modeled by Tc, the physical temperature of the MKID device, and other known parameters. We obtain Tc by comparing the measured lifetime with that acquired using the theoretical model. Using an MKID fabricated with aluminum, we demonstrate this method at a 0.3 K operation. The results are consistent with those obtained by Tc measured by monitoring the transmittance of the readout microwaves with the variation in the device temperature. The method proposed in this paper is applicable to other types, such as a hybrid-type MKID.

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“…Therefore, compared with other types of superconducting detectors, there is an advantage in constructing a large format array. In particular, the field of radio astronomy has started using antenna-coupled MKID arrays [2][3][4].…”

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confidence: 99%

“…The diagram of our setup is shown in Figure 2. Our cryostat consists of 4 K, 40 K, and 300 K thermal shields [4], and is cooled using a pulse tube refrigerator (PT415, Cryomech Co. Ltd). Magnetic shields (MS-FR, Hitachi material) were set outside of the 40 K and 300 K thermal shields; three sheets were set outside of the 40 K shield, three sheets (four sheets) were set outside the wall (bottom plate) of the 300 K shield.…”

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A measurement method for responsivity of microwave kinetic inductance detector by changing power of readout microwaves

Kutsuma

Hattori

Koyano

et al. 2019

Applied Physics Letters

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Superconducting detectors are a modern technology applied in various fields. The microwave kinetic inductance detector (MKID) is one of cutting-edge superconducting detector. It is based on the principle of a superconducting resonator circuit. A radiation entering the MKID breaks the Cooper pairs in the superconducting resonator, and the intensity of the radiation is detected as a variation of the resonant condition. Therefore, calibration of the detector responsivity, i.e., the variation of the resonant phase with respect to the number of Cooper-pair breaks (quasiparticles), is important. We propose a method for responsivity calibration. Microwaves used for the detector readout locally raise the temperature in each resonator, which increases the number of quasiparticles. Since the magnitude of the temperature rise depends on the power of readout microwaves, the number of quasiparticles also depends on the power of microwaves. By changing the power of the readout microwaves, we simultaneously measure the phase difference and lifetime of quasiparticles. We calculate the number of quasiparticles from the measured lifetime and by using a theoretical formula. This measurement yields a relation between the phase response as a function of the number of quasiparticles. We demonstrate this responsivity calibration using the MKID maintained at 285 mK. We also confirm consistency between the results obtained using this method and conventional calibration methods in terms of the accuracy.

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GroundBIRD: Observation of CMB Polarization with a Rapid Scanning and MKIDs

Cited by 8 publications

References 12 publications

Applications for Microwave Kinetic Induction Detectors in Advanced Instrumentation

Applications for Microwave Kinetic Induction Detectors in Advanced Instrumentation

A method to measure superconducting transition temperature of microwave kinetic inductance detector by changing power of readout microwaves

A measurement method for responsivity of microwave kinetic inductance detector by changing power of readout microwaves

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