Takafumi KOJIMA


Development of Superconducting Devices Supporting Radio Astronomy
Yoshinori UZAWA Matthias KROUG Takafumi KOJIMA Masanori TAKEDA Kazumasa MAKISE Shohei EZAKI Wenlei SHAN Akihira MIYACHI Yasunori FUJII Hirotaka TERAI 
Publication:   
Publication Date: 2021/09/01
Vol. E104-C  No. 9  pp. 411-421
Type of Manuscript:  INVITED PAPER (Special Section on Fabrication of Superconductor Devices; Key Technology in Superconductor Electronics)
Category: 
Keyword: 
radio astronomySIS mixersALMA Band 10widebandmultibeam
 Summary | Full Text:PDF(2MB)

Low Leakage Current Nb-Based Tunnel Junctions with an Extra Top Al Layer
Mizuki IKEYA Takashi NOGUCHI Takafumi KOJIMA Takeshi SAKAI 
Publication:   
Publication Date: 2017/03/01
Vol. E100-C  No. 3  pp. 291-297
Type of Manuscript:  Special Section PAPER (Special Section on Leading-Edge Technologies of Superconducting Measurement Systems)
Category: 
Keyword: 
SISjunctionIV characteristicsub-gap currentSTEMEDX
 Summary | Full Text:PDF(2.9MB)