Abstract
Noise characteristics of a large-β dc SQUID have been studied experimentally in the case when a SQUID inductance is resistively shunted. Here, ß=2LIo/¢o is a modulation parameter, L is a SQUID inductance, Io is a critical current and ¢o is the flux quantum. Energy resolutions of the SQUIDs, ε, have been measured for various β values up to β=19. It is shown experimentally that energy resolutions of the present large-β SQUIDs are as small as that of the conventional SQUID with β=1. For example, energy resolution ε=25h was obtained even for β=12(L=340pH and Io=37µA), where his the Planck constant. The obtained experimental results agree quantitatively with theoretical ones. It is also shown that the present resistively-shunted-inductance scheme is very useful in developing SQUIDs operating at T=77k with high-Tc superconductors, where the value of β will become necessarily large in order to avoid noise effects. Numerical simulations on the performance of the high-Tc SQUID are presented.
| Original language | English |
|---|---|
| Pages (from-to) | 1154-1157 |
| Number of pages | 4 |
| Journal | IEEE Transactions on Magnetics |
| Volume | 25 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - Jan 1 1989 |
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All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Electrical and Electronic Engineering
Cite this
Low noise operation of a DC squid in a large β regime and its application to the design of a high TC squid. / Enpuku, Keiji; Kohjiro, S.; Yoshida, K.
In: IEEE Transactions on Magnetics, Vol. 25, No. 2, 01.01.1989, p. 1154-1157.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Low noise operation of a DC squid in a large β regime and its application to the design of a high TC squid
AU - Enpuku, Keiji
AU - Kohjiro, S.
AU - Yoshida, K.
PY - 1989/1/1
Y1 - 1989/1/1
N2 - Noise characteristics of a large-β dc SQUID have been studied experimentally in the case when a SQUID inductance is resistively shunted. Here, ß=2LIo/¢o is a modulation parameter, L is a SQUID inductance, Io is a critical current and ¢o is the flux quantum. Energy resolutions of the SQUIDs, ε, have been measured for various β values up to β=19. It is shown experimentally that energy resolutions of the present large-β SQUIDs are as small as that of the conventional SQUID with β=1. For example, energy resolution ε=25h was obtained even for β=12(L=340pH and Io=37µA), where his the Planck constant. The obtained experimental results agree quantitatively with theoretical ones. It is also shown that the present resistively-shunted-inductance scheme is very useful in developing SQUIDs operating at T=77k with high-Tc superconductors, where the value of β will become necessarily large in order to avoid noise effects. Numerical simulations on the performance of the high-Tc SQUID are presented.
AB - Noise characteristics of a large-β dc SQUID have been studied experimentally in the case when a SQUID inductance is resistively shunted. Here, ß=2LIo/¢o is a modulation parameter, L is a SQUID inductance, Io is a critical current and ¢o is the flux quantum. Energy resolutions of the SQUIDs, ε, have been measured for various β values up to β=19. It is shown experimentally that energy resolutions of the present large-β SQUIDs are as small as that of the conventional SQUID with β=1. For example, energy resolution ε=25h was obtained even for β=12(L=340pH and Io=37µA), where his the Planck constant. The obtained experimental results agree quantitatively with theoretical ones. It is also shown that the present resistively-shunted-inductance scheme is very useful in developing SQUIDs operating at T=77k with high-Tc superconductors, where the value of β will become necessarily large in order to avoid noise effects. Numerical simulations on the performance of the high-Tc SQUID are presented.
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UR - http://www.scopus.com/inward/citedby.url?scp=0024628276&partnerID=8YFLogxK
U2 - 10.1109/20.92494
DO - 10.1109/20.92494
M3 - Article
AN - SCOPUS:0024628276
VL - 25
SP - 1154
EP - 1157
JO - IEEE Transactions on Magnetics
JF - IEEE Transactions on Magnetics
SN - 0018-9464
IS - 2
ER -