2022 Fiscal Year Research-status Report
Development of radiation-resistant superconducting detector arrays for satellite missions in the millimetre waveband
| Project/Area Number |
22K14060
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| Research Institution | Okayama University |
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Principal Investigator |
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| Project Period (FY) |
2022-04-01 – 2027-03-31
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| Keywords | MKID / superconductivity / radiation resistance |
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| Outline of Annual Research Achievements |
We have completed the design and fabrication of several small test chips (16 detectors) with several backings including aluminium, niobium, palladium, etc. These detectors were tested at 1.6 K in the cryostat at Okayama University in both the frequency and the time domain, with time-dependent measurements taken on two detectors simultaneously. In the meantime, we are preparing for measurements at 100 mK in a cryostat at the University of Paris-Saclay in France. We have acquired measurement utilities for this experiment, as well as microwave circuit design allowing for these measurements without the use of multiplexing readout. Several tests are planned for the Aluminium chip at 100 mK which will be compared with those of the metal-free chip. We anticipate that these tests will be completed in the next 6 weeks at Paris Saclay.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
There was fabrication delay at the fabrication facility (AIST in the Tokyo area) who were doing renovations at their laboratory. These were completed and the fabrication was carried forward quickly. The tests at 100 mK were only started recently due to the lack of a 100 mK cryostat at Okayama University. We plan to continue doing higher temperature measurements at Okayama University after returning.
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| Strategy for Future Research Activity |
We will continue the 100 mK tests in the next few weeks. Depending on the results, we will work on some simulations as well as plan the next few rounds of experiments at higher temperatures at Okayama University. Once the optimal material has been chosen, we will begin to optimise the detector design as well as develop a larger array。
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| Causes of Carryover |
The manufacture of the arrays was delayed, and the semiconductor shortage also affected the procuring of some devices. We plan to get more equipment and larger arrays in the next fiscal year.
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