Development of a Data Acquisition System for Kinetic Inductance Detectors: Wide Dynamic Range and High Sampling Rate for Astronomical Observation

Suzuki, Junya; Ishitsuka, H.; Lee, K.; Oguri, S.; Tajima, O.; Tomita, Naohide; Won, E.

doi:10.1007/s10909-018-2033-x

Cited by 10 publications

(3 citation statements)

References 14 publications

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“…Two channels each of the DAC and ADC were employed, at a sampling rate of 200 MHz. For each frequency tone, the amplitude and phase responses were extracted based on a direct down-conversion logic [22], and the down-sampled signals were recorded at a frequency below 1 MHz.…”

Section: Cryostat and Readout Systemmentioning

confidence: 99%

Characterization of two-level system noise for microwave kinetic inductance detector comprising niobium film on silicon substrate

Sueno,

Honda,

Kutsuma

et al. 2021

Preprint

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A microwave kinetic inductance detector (MKID) is a cutting-edge superconducting detector. It comprises a resonator circuit constructed with a superconducting film on a dielectric substrate. To expand its field of application, it is important to establish a method to suppress the two-level system (TLS) noise that is caused by the electric fluctuations between the two energy states at the surface of the substrate. The time dependence of the fluctuation causes a frequency dependence. Similarly, the electric field power dependence of the fluctuation causes a readout power dependence. The electric field density can be decreased by expanding the strip width (S) and gap width from the ground plane (W) in the MKID circuit, allowing the suppression of TLS noise. However, the effectiveness of this method has not yet been confirmed for MKIDs made with niobium films on silicon substrates. In this study, we demonstrate its effectiveness for such MKIDs. We expanded the dimension of the circuit from (S, W) = (3.00 µm, 4.00 µm) to (S, W) = (5.00 µm, 23.7 µm), and achieved an increased suppression of 5.5 dB in TLS noise.

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Section: Cryostat and Readout Systemmentioning

confidence: 99%

Characterization of two-level system noise for microwave kinetic inductance detector comprising niobium film on silicon substrate

Sueno,

Honda,

Kutsuma

et al. 2021

Preprint

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show abstract

“…Its resonant frequency and quality factor are f r = 4.30 GHz and Q r = 2.61 × 10 4 , respectively. Our readout system 27,28 measures the response based on a direct down-conversion logic with a 200 MHz sampling speed, and the data are down-sampled to a 1 MHz step. The power of the readout microwave is controlled by a variable attenuator (LDA-602, Vaunix Co. LTD).…”

mentioning

confidence: 99%

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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“…Under a dark condition, its resonant frequency and quality factor are f r0 = 6.07 GHz and Q r0 = 4.78 × 10 4 , respectively. Our readout electronics measured the resonance based on a direct down-conversion logic with 200 MHz sampling speed [16,17], and the data was down-sampled to 1 MHz step. This step is sufficient for this demonstration.…”

mentioning

confidence: 99%

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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Development of a Data Acquisition System for Kinetic Inductance Detectors: Wide Dynamic Range and High Sampling Rate for Astronomical Observation

Cited by 10 publications

References 14 publications

Characterization of two-level system noise for microwave kinetic inductance detector comprising niobium film on silicon substrate

Characterization of two-level system noise for microwave kinetic inductance detector comprising niobium film on silicon substrate

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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