• Title/Summary/Keyword: Basic Science

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Conceptual design of cryomodules for RAON

  • Kim, Y.;Lee, M.K.;Kim, W.K.;Jang, H.M.;Choi, C.J.;Jo, Y.W.;Kim, H.J.;Jeon, D.
    • Progress in Superconductivity and Cryogenics
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    • v.16 no.3
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    • pp.15-20
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    • 2014

  • The heavy ion accelerator that will be built in Daejeon, Korea utilizes superconducting cavities operating in 2 K. The cavities are QWR (quarter wave resonator), HWR (half wave resonator), SSR1 (sing spoke resonator1) and SSR2. The main role of the cryomodule is supplying thermal insulation for cryogenic operation of the cavities and maintaining cavities' alignment. Thermal and structural consideration such as thermal load by heat leak and heat generation, cryogenic fluid management, thermal contraction, and so on. This paper describes detailed design considerations and current results have being done including thermal load estimation, cryogenic flow piping, pressure relief system, and so on.

  • https://doi.org/10.9714/psac.2014.16.3.015 인용 PDF KSCI

S&T Policy Trend Using Language Network Analysis: Focusing on Science and Technology Basic Plan

  • Kim, Yun Jong;Jeong, Dae-hyun;Oh, Hyunchul
    • Asian Journal of Innovation and Policy
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    • v.6 no.2
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    • pp.111-137
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    • 2017

  • This study analyzes a language network of Science and Technology Basic Plan, which is the basis for science and technology policy in Korea, for the next Science and Technology Basic Plan. Language network analysis was adopted for a quantitative approach measuring the trend of policies. Several techniques such as keyword analysis, language network map analysis, quantitative characteristics analysis and keyword-related major-word analysis have been performed. Results show that there are common policies emphasized by all Science and Technology Basic Plans in the past, and there are also specific policies emphasized in each period of the Science and Technology Basic Plan. These specific policies come from a 'change of times' when the Science and Technology Basic Plans were established, as well as the philosophy of the national government.

  • https://doi.org/10.7545/ajip.2017.6.2.111 인용 PDF KSCI

The Design of Thermal Shield for KSTAR TOKAMAK (KSTAR TOKAMAK의 열차폐막 설계)

  • Kim, Dong-Lak;No, Yung-Mi;Her, Nam-Il;Cho, Seung-Yeon;Yuk, Jong-Seol;Ahn, Gwi-Cheon;Doh, Cheol-Jin;Kwon, Myun;Lee, Gyung-Su;Yoon, Byung-Ju
    • Proceedings of the Korea Institute of Applied Superconductivity and Cryogenics Conference
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    • 2001.02a
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    • pp.45-47
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    • 2001

  • The function of the thermal shield(TS) is to eliminate the thermal radiation from the room temperature side to the coil temperature(4.5K) region so as to reduce the thermal load on the He refrigerator. The TS is composed of multilayer insulation(MLI) which is coated very thin aluminum on the insulating material, cryopanel which is cooled by cold gaseous He, and supports which stand the cryopanel and MLI on the room temperature part. The thermal shield for the TF coils and PF coils has been located between the coils and vacuum vessel. The thermal shielding cryopanel is cooled under 80 K by a forced flow of helium gas using cooling pipes on the cryopanel.

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