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19 results on '"Akamatsu, H."'

5. ATHENA X-IFU Demonstration Model: First Joint Operation of the Main TES Array and its Cryogenic AntiCoincidence Detector (CryoAC)

Author

D’Andrea, M., Ravensberg, K., Argan, A., Brienza, D., Lotti, S., Macculi, C., Minervini, G., Piro, L., Torrioli, G., Chiarello, F., Ferrari Barusso, L., Biasotti, M., Gallucci, G., Gatti, F., Rigano, M., Akamatsu, H., Dercksen, J., Gottardi, L., de Groote, F., den Hartog, R., den Herder, J.-W., Hoogeveen, R., Jackson, B., McCalden, A., Rosman, S., Taralli, E., Vaccaro, D., de Wit, M., Chervenak, J., Smith, S., and Wakeham, N.

Published
2022
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14. ATHENA X-IFU Demonstration Model: First Joint Operation of the Main TES Array and its Cryogenic AntiCoincidence Detector (CryoAC).

Author

D'Andrea, M., Ravensberg, K., Argan, A., Brienza, D., Lotti, S., Macculi, C., Minervini, G., Piro, L., Torrioli, G., Chiarello, F., Ferrari Barusso, L., Biasotti, M., Gallucci, G., Gatti, F., Rigano, M., Akamatsu, H., Dercksen, J., Gottardi, L., de Groote, F., and den Hartog, R.

Subjects
COSMIC ray muons, DETECTORS, CALORIMETERS, MUONS
Abstract

The X-IFU is the cryogenic spectrometer onboard the future ATHENA X-ray observatory. It is based on a large array of TES microcalorimeters, which work in combination with a Cryogenic AntiCoincidence detector (CryoAC). This is necessary to reduce the particle background level thus enabling part of the mission science goals. Here we present the first joint test of X-IFU TES array and CryoAC Demonstration Models, performed in a FDM setup. We show that it is possible to operate properly both detectors, and we provide a preliminary demonstration of the anti-coincidence capability of the system achieved by the simultaneous detection of cosmic muons. [ABSTRACT FROM AUTHOR]

Published
2022
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15. Development of Ultra-Low-Noise TES Bolometer Arrays

Author

Khosropanah, P., Ridder, M. L., Hijmering, R. A., Gao, J. R., Akamatsu, H., Gottardi, L., van, der Kuur J., Jackson, B. D., and Suzuki, Toyoaki

Subjects
DRIE, 01 natural sciences, Omega, Deep reactive-ion etching, law.invention, Far-infrared spectrometer, SiN membrane, law, 0103 physical sciences, General Materials Science, Grating spectrometer, 010306 general physics, 010303 astronomy & astrophysics, Transition edge, Physics, Superconductivity, Bolometer, THz detectors, Condensed Matter Physics, Atomic and Molecular Physics, and Optics, Low noise, Cryogenic detectors, Development (differential geometry), Atomic physics, Phonon noise, Transition edge sensor, TES
Abstract

Accepted: 2015-11-30, 資料番号: SA1160043000

Published
2015

16. Thermal Load Minimization of the Frequency Domain Multiplexed Readout for the Athenar X-IFU Instrument.

Author

Van Der Kuur, J., Gottardi, L. G., Akamatsu, H. A., Van Leeuwen, B. J., Den Hartog, R., Kiviranta, M., and Jackson, B.

Subjects
ENERGY dissipation, ASTROPHYSICS, CALORIMETERS, ENERGY consumption, BANDWIDTHS
Abstract

The high sensitivity of cryogenic TES-based detectors opens new windows for astrophysical observations ranging from (far) infrared to X-rays. A number of operational and future space and ground-based instruments rely on cryogenic detectors to improve their performance with respect to the capabilities of earlier technologies. To reach the required sensitivities, base temperatures as low as 50 mK are necessary, and stringent requirements on magnetic shielding, microvibrations, and temperature stability are applicable. To minimize the heat load and complexity of the instruments, efficient multiplexing schemes and low-power amplifiers are needed. In addition, for space-based cryogenic instruments, mechanical launch loads and power consumption limitations constrain the available parameter space for engineering further. This paper discusses the system design considerations which are applicable to optimize the multiplex factor within the boundary conditions as set by the space craft for the X-IFU instrument on the Athena observatory. More specifically, the interplay between the science requirements such as pixel dynamic range, pixel speed, and cross talk, and the space craft requirements such as the power dissipation budget, and available bandwidth will be discussed. [ABSTRACT FROM AUTHOR]

Published
2017
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17. Impedance Measurement of a Gamma-Ray TES Calorimeter with a Bulk Sn Absorber.

Author

Akamatsu, H., Ishisaki, Y., Hoshino, A., Ezoe, Y., Ohashi, T., Takei, Y., Yamasaki, N. Y., Mitsuda, K., Oshima, T., and Tanaka, K.

Subjects
*CALORIMETERS, *GAMMA rays, *PHONONS, *TEMPERATURE measuring instruments, *ELECTRIC impedance
Abstract

We performed complex impedance measurements with a Ti/Au-based gamma-ray TES calorimeter with a bulk Sn absorber. Excellent energy resolution of 38.4±0.9eV at 60 keV was observed. The impedance of the calorimeter can be well explained by a two-body thermal model. We investigated the behavior of the parameters of the calorimeter during the superconducting-to-normal transition. We confirmed that C and Ga are in good agreement with the predicted values. We performed a noise analysis and found several excess noise components, as well as internal thermal fluctuation noise (ITFN) term due to the thermal conductance between the Sn absorber and the Ti/Au TES. Dominanting the noise is an excess noise having a similar frequency dependence to the phonon noise and the ITFN noise. [ABSTRACT FROM AUTHOR]

Published
2009
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18. Performance test of Ti/Au bilayer TES microcalorimeter in combination with continuous ADR.

Author

Ishisaki, Y., Akamatsu, H., Hoshino, A., Numazawa, T., Kamiya, K., Fujimoto, R., Kojima, Y., Shinozaki, K., Mitsuda, K., and Shirron, P.

Subjects
*CALORIMETERS, *REFRIGERATORS, *TRANSITION temperature, *MAGNETIC fields, *ELECTRIC equipment
Abstract

Performance test of a Ti/Au bilayer TES microcalorimeter has been made in combination with a continuous adiabatic demagnetization refrigerator (CADR). The CADR has four stages of ADR to produce continuous cooling by recycling them in dedicated order, and is cryogen-free utilizing a 4K-GM refrigerator. We installed a Ti/Au bilayer TES microcalorimeter and 420-series SQUID array to readout the X-ray signal on the 1st (coldest) stage of the CADR. We successfully operated the CADR at temperature of 120 mK in continuous mode more than 27 hr, however, FWHM energy resolution of the TES microcalorimeter was degraded to 45 eV at 6 keV, as compared to 10 eV when measured in a dilution refrigerator. This is mainly because the temperature stability was not good enough (about 0.6 mK) and the operation temperature was not sufficiently lower than the transition temperature Tc = 135mK of the TES. We operated the TES microcalorimeter at the operation temperature of 105 mK in one-shot mode and the resolution was improved to 30 eV. We also found that the operating point of the TES was affected by the magnetic field of the 3rd and 4th ADR recycle. More complete shielding of the magnetic field is essential for further improvement of the performance of the TES microcalorimeter. [ABSTRACT FROM AUTHOR]

Published
2009
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19. Low-Bandwidth Operation of TES-Based Bolometer Operation in a Resistance Locked Loop.

Author

Kuur, J., Gottardi, L., Akamatsu, H., Bruijn, M., Hartog, R., Hoevers, H., Gao, J., Hijmering, R., Khosropanah, P., and Ridder, M.

Subjects
PARTICLE detectors, BANDWIDTHS, CRYOGENICS, BOLOMETERS, THERMAL stability, ELECTRIC potential
Abstract

Operation of TES-based bolometers in a resistance locked loop (RLL), i.e. keeping the operating resistance constant by means of feedback on the bias voltage, provides a number of attractive properties for applications. In combination with frequency domain multiplexing, the technique reduces electrical cross talk, and provides a more detector load independent behaviour with respect to operation under standard voltage bias. This paper shows a quantitative estimation of the large signal properties under the RLL, and shows a comparison with the situation under voltage bias. Furthermore, an unorthodox, low-bandwidth mode of operation will be discussed, from the perspective of the electro-thermal stability in the RLL. [ABSTRACT FROM AUTHOR]

Published
2014
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