B. K. Kim, K. K. Yu, J. M. Kim, H. Kwon, S. K. Lee, Y. H. Lee
언어
한국어(KOR)
URL
https://www.earticle.net/Article/A388697
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4,000원
원문정보
초록
영어
We fabricated superconducting quantum interference devices (SQUIDs) based on Nb Josephson junctions, and characterized the key parameters of the SQUIDs. The SQUIDs are double relaxation oscillation SQUIDs (DROSs) having larger flux-to-voltage transfer coefficient than the standard DC-SQUIDs. SQUID sensors were fabricated by using Nb junction technology consisted of a DC magnetron sputtering and a conventional photolithography process. In multichannel SQUID systems for whole-head magnetoencephalography measurement with a helmet-type SQUID array, we need about 336 SQUID sensors for each system. In this paper, we fabricated a few hundred SQUID sensors, measured the critical current, flux modulation voltage and decided if each tested SQUID can be used for the multichannel systems. As the criterion for the acceptance of the sensors, we chose the critical current and amplitude of the modulation voltage to be 8 ㎂ and 80 ㎶, respectively. The average critical current of the SQUIDs was 10.58 ㎂. The typical flux noise of the SQUIDs with input coil shorted was 2 μΦ0/√Hz at white region.
목차
Abstract 1. 서론 2. DROS 센서의 제작 2.1. DROS센서의 구조 2.2. DROS센서의 제작 3. DROS 센서의 특성 평가 3.1. DROS 센서 특성 평가 환경 3.2. DROS 센서의 전류-전압 및 자속-전압 특성 3.3. DROS 센서의 통계적 특성 4. 결론 REFERENCES