Yasuharu Kamioka Ph.D


Academic interests and works

Basically his interest is in superfluid helium heat transfer. The heat transfer problem in a magnet cooled by subcooled superfluid helium was his major work. He extended his work into a dilution refrigerator and developed several type of dilution refrigerator such as a plastic one which is used in an extremely high field pulse magnet, a long tail one for high field magnet and a liquid helium free one using cryocooler. During the time at Toyo Sanso Co., Ltd. – Taiyo Nippon Sanso Corp., many cryogenic equipment and systems were developed for academic and industrial research. Recently his interest is in HTS application cooling system. Neon turbo Brayton refrigerator for large HTS applications was developed under his leadership at Taiyo Nippon Sanso.

He has about 40 patents and more than 70 papers in cryogenics.



Post & Organization : President    ColdTech LLC

Fellow, Cryogenics and Superconductivity Society of Japan (CSSJ)

Executive Director, Japan Industrial Society of Cryogenics and Superconductivity(JISOCS)  

Academic Background:

Graduated from Tokyo University of Agriculture and Technology (TUAT) in 1972.

PhD(Engineering, Heat transfer of pressurized superfluid Helium II)  from University of Tokyo in 1984.

Professional Career:

Joined with Toyo Sanso Co., Ltd. in 1972 and was working as a R&D researcher in cryogenic engineering.

Was a visiting researcher at University of California at Los Angeles (UCLA).

Was a general manager of Cryogenic Development Lab. of Toyo Sanso Co., Ltd.

Was a visiting professor of Research Center for Materials Science at Extreme Conditions, Osaka University and a lecturer of Sophia University.

Was a general manager of Cryogenics Department of Taiyo Toyo Sanso Co., Ltd.    Was a corporate officer of Taiyo Nippon Sanso Corporation 


Cryogenics and Superconductivity Society of Japan(CSSJ)

International Institute of Refrigeration (IIR)

Japan Industrial Society of Cryogenics and Superconductivity(JISOCS)  



Founder of International Workshop on Cooling System for HTS Applications (IWC-HTS)


Organizer and editor of International Cryogenic Engineering Conference 24 - International Cryogenic Materials Conference 2012 (ICEC 24-ICMC 2012)


former Executive director and board member of  Cryogenics and Superconductivity Society of Japan (CSSJ)


former Chairman of Institute of Cryogenic Engineering (in CSSJ)


Executive director of Japan Industrial Society of Cryogenics and Superconductivity (JISOCS)


former Vice Chairman of A1, International Institute of Refrigeration (IIR)    




NASA  Certificate of Recognition for Vapor phase separator of He II 1983


the 35th Minister of Education, Science and Technology Award from The Nikkan Kogyo Shimbun

in  Development of a liquid nitrogen cooled superconducting motor  2006


Engineering Development Award from Cryogenics and Superconducting Society of Japan 2015 


Scientific publications

1) Y.Kamioka , C.Chuang and T.H.K.Frederking Kinematics of fluid flow instabilities in low temperature

    transfer systems, IIR Commission B1,B2,E1,E2, 1980 311

2) C.Chuang, Y.Kamioka and T.H.K.Frederking, Transient superconductor(NbTi/Cu) He II heat transfer

    rates to pressurized superfluid during step input in power stability of superconductor, IIR Commission

    A1/2 1981 63

3) Y.Kamioka , J.M.Lee and T.H.K.Frederking, The Gorter Mellink constant associated with counter flow

    convection in pressurized superfluid He II (He 4), ICEC 9 1982 283

4) Y.Kamioka , C.Chuang and T.H.K.Frederking, Simplified technique for the evaluation of multiple layer

    insulation, ICEC 9 1982 568

5) Y.I.Kim, Y.Kamioka and T.H.K.Frederking, Dynamic quench of NbTi in pressurized HeII Single

    transition during temperature excursion across the transposed critical curve, Cryogenics Vol. 22 1982


6) Y.Kamioka , The prediction of steady state heat flux and related temperature profiles in pressurized

    superfluid helium II, Cryogenics Vol. 23 1983 367

7) Y.Kamioka , C.Chuang and T.H.K.Frederking, Unsteady conductor heating probing weakly and strongly

    stratified cryoliquid XVI IIR 1983

8) S.W.K.Yuan, J.M.Lee, Y.Kamioka and T.H.K.Frederking, Plug flow comparison, Space helium dewar

    conference and workshop, 1983

9) T.H.K.Frederking, C.Chuang, Y.Kamioka , J .M.Lee and S.W.K.Yuan, Sintered plug flow modulation of a

    vapor liquid phase separator for a helium II vessel, Advances in Cryogenic Engineering Vol. 29 1984


10) Y.Kamioka , M.Wake, Y.Suzuki, T.Shinagawa, M.Murakami and H. A double acting bellows

    type liquid helium pump, ICEC 10 1984 578

11) Akinori Koukitu, Yoshitusgu Hasegawa, Hisashi Seki, Hirinao Kojima, Isao Tanaka and Yasuharu

    Kamioka , Preparation of Y Ba Cu O superconducting thin films by the mist microwave plasma

    decomposition method, JJAP Vol.28 1989 L1212

12) S.W.K.Yuan, J.M.Lee, S.Caspi, S.C.Sloski, F.C.Vote, J.P.Maddox, R.C.Amar, C.Linnet, Y.Kamioka ,

    Y.I.Kim, W.E.W.Chen, J.D.Schweikle, W.A.Hepler, P.Khandhar, R.Caradang, J.M.Lee, M.Kamegawa,

    T.Chuang, Y.W.Chang and R.C.Chapman, Superfluid transport and its applications in space, Cryogenics

    Vol. 30 1990 222

13) Yasuharu Kamioka , Production of pressurized superfluid helium II by directly compressing saturated

    superfluid helium II, Advances in Cryogenic Engineering Vol. 35 1990 287

14) S.Kotani, A.Inoue, H.Suzuki, S.Hasuo, T.Takeuchi, K.Fukase, F.Miyagawa, S.Yoshida, T.Sano and

    Y.Kamioka , A sub ns clock cryogenic system for Josephson computers, ISSCC91, the digest of

    technical papers Vol.34 Feb. 1991 32

15) Seigo Kotani, Atsuki Inoue, Hideo Suzuki, Sinya Hasuo, Toshikazu Takeuchi, Katsuya Fukase, Fumio

    Miyagawa, Shigeru Yoshida, Tomonobu Sano and Yasuharu Kamioka , A subnonosecond clock cryogenic

    system for Josephson computers, IEEE Transactions on applied superconductivity V ol.1 1991 164

16) Shigeru Yoshida, Tomonobu Sano and Yasuharu Kamioka , A cryogenic system for Josephson computers,

    Advances in Cryogenic Engineering Vol. 37 1992 623

17) Naoyuki Takahashi, Akinori Koukitu, Hisashi Seki and Yasuharu Kamioka , Preparation of

    (Tl , Sr Ca Cu O) superconducting thin films by the mist microwave plasma chemical vapor

    deposition method, JJAP Vol.33 1994 L840

18) Y.Hirata, S.Kuriki, S.Nakayama, K.Chinone, T.Ataka, K.Ikeda and Y.Kamioka , Design and development

    of a 19 channel SQUID magnetometer system, Rev. Sci. Instr., Vol.65 1994 29

19) Shigeru Yoshida, Takahiro Umeno and Yasuharu Kamioka , Development of a flexibly separated 4K head

    refrigerator for a SQUID system, Advances in Cryogenic Engineering Vol. 39 1994 1263

20) Shigeru Yoshida, Satomi Mori, Takahiro Umeno, Yasuharu Kamioka , Michio Watanabe and Yoichi

    Ootuka, Compact dilution refrigerator, ICEC16 1997 457

21) T.Umeno, S.Yoshida and Y.Kamioka , Variation of dilution refrigerator, ICEC17 1998 307

22) S.Yoshida, Y.Yagi, T.Umeno, T.Ishida, Y.Kamioka , H.Ogino, M.Iwakuma, K.Funaki, Y.Yasukawa and

    M.Konno, 1 ATM subcooled liquid nitrogen cryogenic system for oxide superconducting power

    transformer, Advances in Cryogenic Engineering Vol.43 1998 1191 

23) S.Yoshida, K.Ohashi, T.Umeno, Y.Suzuki, Y.Kamioka , H.Kimura, K.Tsutsumi, M.Iwakuma, K.Funaki,


    GM REFRIGERATOR FOR A HTS POWER TRANSFORMER, Advances in Cryogenic Engineering

    Vol.47 2002 473

24) Keisuke Maehata, Toru Taino, Yasuaki Kawasaki, Akihito Hora, Tetsuya Ariyoshi, Kenji Ishibashi,

    Takahiro Umeno, Yasuharu Kamioka and Hiromi Sato, Operation test system of superconducting tunnel

    junction photon detectors using a compact 3He-4He dilution refrigerator, RIKEN Review No.47 2002


25) Yoshiaki Suzuki, Shigeru Yoshida and Yasuharu Kamioka , Subcooled liquid nitrogen refrigerator for

    HTS power systems, Cryogenics 43 2003 597

26) A.Sato, M.Maeda, M.Yuyama and Y.Kamioka , Normalized representation for steady state heat transport

    in a channel containing HeII covering pressure range up to 1.5Mpa, ICEC 20 at Beijin 2004

27) A.Sato, M.Maeda, M.Yuyama and Y.Kamioka , Temperature dependence of the Gorter Mellink exponent

    m measured in a channel containing He II, Advances in Cryogenic Engineering Vol.51 2006 387

28) A.Sato, M.Maeda, M.Yuyama and Y.Kamioka , Heat transport near the lambda line in a channel

    containing He II, Advances in Cryogenic Engineering Vol.51 2006 379

29) Hirai, H., Suzuki, Y., Hirokawa, M., Kobayashi, H., Kamioka, Y., Iwakuma, M., Shiohara, Y. Development 

    of a Turbine Cryocooler for High Temperature Superconducting Applications, Physica C 469 Proceedings of

    21th International Symposium on Superconductivity, Elsevier, 2009, p.1857-1861

30) Abe K., Hosaka J., Iida T., Ikeda M., Kobayashi K., Koshio Y., Minamino A., Miura M., Moriyama S., 

   Nakahata M., Nakajima Y., Namba T., Ogawa H., Sekiya H., Shiozawa M., Suzuki Y., Takeda A., Takeuchi Y.,

   Ueshima K., Yamashita M., Kaneyuki K., Ebizuka Y., Kikuchi J., Ota A., Suzuki S., Takahashi T., Hagiwara

   H., Kamei T., Miyamoto K., Nagase T., Nakamura S., Ozaki Y., Sato T., Fukuda Y., Sato T., Nishijima K.,

   Sakurai M., Maruyama T., Motoki D., Itow Y., Ohsumi H., Tasaka S., Kim S.B., Kim Y.D., Lee J.I., Moon

   S.H., Urakawa Y., Uchino M. and Kamioka Y. Distillation of Liquid Xenon to Remove Krypton,

   Astropart.Phys. 31 (2009) 290-296

31)Yoshida, S., Hirai, H., Takaike, A., Hirokawa, M., Aizawa, Y., Kamioka, Y., Okamoto, H., Hayashi, H.,

    Shiohara, Y. New Design of Neon Refrigerator for HTS Power Machines, Advances in Cryogenic Engineering

    55. AIP Press. Melville, New York, 2010, p1131-1138

32) Hirai, H., Hirokawa, M., Yoshida, S., Kamioka, Y., Takaike, A., Hayashi, H., Okamoto, H., Shiohara, Y.

    Development of a neon cryogenic turbo-expander with magnetic bearing. Advances in Cryogenic Engineering

    55. AIP Press. Melville, New York, 2010, p895-902

33) Hirai, H., Hirokawa, M., Yoshida, S., Takaike, A., Ozaki, S., Nara, N., Uwamori, K., Kamioka, Y., Hayashi,

    H., Okamoto, H., Shiohara, Y. Development of a neon turbo-compressor with active magnetic bearing.

    ICEC23, Wroclaw, Poland, 2011

34) Y.Kamioka, K.Agatsuma, K.Kajikawa, H.Ueda, M.Furuse, S.Fuchino, T.Iitsuka and S.Nakamura,

    Medical Protein Separation System Using High Gradient Magnetic Separation by Superconducting

    Magnet, Advances in Cryogenic Engineering Vol.59 2014 1129

35) Kazuhiro Kajikawa, Hiroshi Ueda, Yasuharu Kamioka , Koh Agatsuma, Shuichiro

    Fuchino,Mitsuho Furuse, Tomohiro Iitsuka and Shuichi Nakamura, Development of

    Degaussing System of Magnetic Filters for High Gradient Magnetic Separation to Improve Recovery

    Ratio of Trapped Magnetic Nanobeads, MT23 2014

36) Yasuharu Kamioka, Kazuhiro Kajikawa, Hirokazu Hirai, Shinsuke Ozaki, Taketsune Nakamura,

    Shinsaku Imagawa, Atsushi Ishiyama, Active magnetic bearing for a liquid nitrogen pump, IOP Conf. 

    Series: Materials Science and Engineering 502 (2019) 012153

and others