Open Access
Reduction of Radio Frequency Interference to HTS-dc-SQUID by Adding a Cooled Transformer
-
Full Text Views
104
- Cite this
- Free PDF (1.9MB)
Summary :
Effect of an addition of a cooled step-up transformer to a flux locked loop (FLL) circuit was studied to reduce indirect rf interference to HTS-dc-SQUID. First, we demonstrated that a noise level of an HTS-dc-SQUID system using the FLL circuit with single room-temperature transformer could be easily degraded by radiation of rf electromagnetic wave to cables in the FLL circuit. It is thought that the rf radiation induced rf current in the circuit, and was transmitted to the SQUID to modulate the bias current, resulting in the increase of the noise level. To avoid the degradation due to such indirect rf interference, the cooled set-up transformer was added to the FLL circuit since it was expected that the additional transformer would work as a "step-down" transformer against the induced rf current. It was shown that the noise level of a HTS-SQUID system (SQUITEM system) operated in an electromagnetically unshielded environment could be improved to the same level as that measured in a magnetically shielded room by the additional cooled transformer and appropriate impedance matching.
- Publication
- IEICE TRANSACTIONS on Electronics Vol.E94-C No.3 pp.266-272
- Publication Date
- 2011/03/01
- Publicized
- Online ISSN
- 1745-1353
- DOI
- 10.1587/transele.E94.C.266
- Type of Manuscript
- Special Section INVITED PAPER (Special Section on Superconducting Signal Processing Technologies)
- Category
Authors
Keyword
Latest Issue
Copyrights notice of machine-translated contents
The copyright of the original papers published on this site belongs to IEICE. Unauthorized use of the original or translated papers is prohibited. See IEICE Provisions on Copyright for details.
Cite this
Copy
Yoshimi HATSUKADE, Yoshihiro KITAMURA, Saburo TANAKA, Keiichi TANABE, Eiichi ARAI, Hiroyuki KATAYAMA, "Reduction of Radio Frequency Interference to HTS-dc-SQUID by Adding a Cooled Transformer" in IEICE TRANSACTIONS on Electronics,
vol. E94-C, no. 3, pp. 266-272, March 2011, doi: 10.1587/transele.E94.C.266.
Abstract: Effect of an addition of a cooled step-up transformer to a flux locked loop (FLL) circuit was studied to reduce indirect rf interference to HTS-dc-SQUID. First, we demonstrated that a noise level of an HTS-dc-SQUID system using the FLL circuit with single room-temperature transformer could be easily degraded by radiation of rf electromagnetic wave to cables in the FLL circuit. It is thought that the rf radiation induced rf current in the circuit, and was transmitted to the SQUID to modulate the bias current, resulting in the increase of the noise level. To avoid the degradation due to such indirect rf interference, the cooled set-up transformer was added to the FLL circuit since it was expected that the additional transformer would work as a "step-down" transformer against the induced rf current. It was shown that the noise level of a HTS-SQUID system (SQUITEM system) operated in an electromagnetically unshielded environment could be improved to the same level as that measured in a magnetically shielded room by the additional cooled transformer and appropriate impedance matching.
URL: https://global.ieice.org/en_transactions/electronics/10.1587/transele.E94.C.266/_p
Copy
@ARTICLE{e94-c_3_266,
author={Yoshimi HATSUKADE, Yoshihiro KITAMURA, Saburo TANAKA, Keiichi TANABE, Eiichi ARAI, Hiroyuki KATAYAMA, },
journal={IEICE TRANSACTIONS on Electronics},
title={Reduction of Radio Frequency Interference to HTS-dc-SQUID by Adding a Cooled Transformer},
year={2011},
volume={E94-C},
number={3},
pages={266-272},
abstract={Effect of an addition of a cooled step-up transformer to a flux locked loop (FLL) circuit was studied to reduce indirect rf interference to HTS-dc-SQUID. First, we demonstrated that a noise level of an HTS-dc-SQUID system using the FLL circuit with single room-temperature transformer could be easily degraded by radiation of rf electromagnetic wave to cables in the FLL circuit. It is thought that the rf radiation induced rf current in the circuit, and was transmitted to the SQUID to modulate the bias current, resulting in the increase of the noise level. To avoid the degradation due to such indirect rf interference, the cooled set-up transformer was added to the FLL circuit since it was expected that the additional transformer would work as a "step-down" transformer against the induced rf current. It was shown that the noise level of a HTS-SQUID system (SQUITEM system) operated in an electromagnetically unshielded environment could be improved to the same level as that measured in a magnetically shielded room by the additional cooled transformer and appropriate impedance matching.},
keywords={},
doi={10.1587/transele.E94.C.266},
ISSN={1745-1353},
month={March},}
Copy
TY - JOUR
TI - Reduction of Radio Frequency Interference to HTS-dc-SQUID by Adding a Cooled Transformer
T2 - IEICE TRANSACTIONS on Electronics
SP - 266
EP - 272
AU - Yoshimi HATSUKADE
AU - Yoshihiro KITAMURA
AU - Saburo TANAKA
AU - Keiichi TANABE
AU - Eiichi ARAI
AU - Hiroyuki KATAYAMA
PY - 2011
DO - 10.1587/transele.E94.C.266
JO - IEICE TRANSACTIONS on Electronics
SN - 1745-1353
VL - E94-C
IS - 3
JA - IEICE TRANSACTIONS on Electronics
Y1 - March 2011
AB - Effect of an addition of a cooled step-up transformer to a flux locked loop (FLL) circuit was studied to reduce indirect rf interference to HTS-dc-SQUID. First, we demonstrated that a noise level of an HTS-dc-SQUID system using the FLL circuit with single room-temperature transformer could be easily degraded by radiation of rf electromagnetic wave to cables in the FLL circuit. It is thought that the rf radiation induced rf current in the circuit, and was transmitted to the SQUID to modulate the bias current, resulting in the increase of the noise level. To avoid the degradation due to such indirect rf interference, the cooled set-up transformer was added to the FLL circuit since it was expected that the additional transformer would work as a "step-down" transformer against the induced rf current. It was shown that the noise level of a HTS-SQUID system (SQUITEM system) operated in an electromagnetically unshielded environment could be improved to the same level as that measured in a magnetically shielded room by the additional cooled transformer and appropriate impedance matching.
ER -
English
