| Title |
Lower Critical Field Measurement of Thin Film Superconductor |
| Authors |
- H. Ito
Sokendai, Ibaraki, Japan
- C.Z. Antoine
CEA/IRFU, Gif-sur-Yvette, France
- A. Four
CEA/DRF/IRFU, Gif-sur-Yvette, France
- H. Hayano, T. Kubo, T. Saeki
KEK, Ibaraki, Japan
- R. Ito, T. Nagata
ULVAC, Inc, Chiba, Japan
- Y. Iwashita, R. Katayama, H. Tongu
Kyoto ICR, Uji, Kyoto, Japan
- H. Oikawa
Utsunomiya University, Utsunomiya, Japan
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| Abstract |
Superconducting thin film is the promising technology to increase the performance of SRF cavities. The lower critical field Hc1, which is one of the important physical parameters characterizing a superconducting material, will be enhanced by coating Nb with thin film superconductor such as NbN. To investigate the Hc1, we developed the Hc1 measurement system using the third harmonic response of applied AC magnetic field. The measurement system consists of helium cryostat with two of GM refrigerators, sample Cu stage, solenoid coil Cu mount, solenoid coil, temperature sensors, and liquid helium level meter. AC magnetic field is produced by a coil which is driven by function generator and power amplifier at around 1 kHz. In order to control the temperature of the sample, we installed heaters and thermal anchors which could be moved by the motor. By this temperature control the sample state can be easily transferred from Meissner state to mixed state. So that the measurement is repeated for various applied magnetic field, and the transition curve can be made. In this report, measurement result of the bulk Nb sample and NbN-SiO2 multilayer thin film sample will be discussed.
|
| Funding |
The work is supported by Japan Society for the Promotion of Science Grant-in-Aid for Young Scientist (A) No.17H04839. |
| Paper |
download TUPO066.PDF [0.717 MB / 4 pages] |
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| Conference |
LINAC2018 |
| Series |
Linear Accelerator Conference (29th) |
| Location |
Beijing, China |
| Date |
16-21 September 2018 |
| Publisher |
JACoW Publishing, Geneva, Switzerland |
| Editorial Board |
Guoxi Pei (IHEP, Beijing, China); Volker RW Schaa (GSI, Darmstadt, Germany); Yong Ho Chin (KEK, Tsukuba, Japan); Shinian Fu (IHEP, Beijing, China); Ning Zhao (IHEP, Beijing, China) |
| Online ISBN |
978-3-95450-194-6 |
| Online ISSN |
2226-0366 |
| Received |
19 September 2018 |
| Accepted |
20 September 2018 |
| Issue Date |
18 January 2019 |
| DOI |
doi:10.18429/JACoW-LINAC2018-TUPO066 |
| Copyright |
 Published by JACoW Publishing under the terms of the Creative Commons Attribution 3.0 International license. Any further distribution of this work must maintain attribution to the author(s), the published article's title, publisher, and DOI. |
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