Jeong Il Heo

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A study on the dielectric characteristics of various cryogenic materials should be conducted to design an electrically reliable high-voltage superconducting apparatus. Especially, the dielectric characteristics of gaseous and solid insulation materials are important for designing current lead parts, and those of gaseous and solid insulation materials are(More)
In the Republic of Korea, it is widely thought that the subcooled liquid nitrogen cooling system is the most promising method to develop a high-voltage superconducting apparatus. This method involves injecting a gaseous insulation medium, such as He, Ne, or N<sub>2</sub>, into the superconducting apparatus to control the system pressure [1]. Therefore, a(More)
Several types of solid materials are used in the development of high voltage superconducting magnet systems as the former and insulation barrier. The solid insulation materials used in cryogenic applications require excellent dielectric characteristics as well as robust mechanical characteristics. In this study, the dielectric experiments for three types of(More)
Since 2011, the Institute for Basic Science has been developing a linear accelerator, called RAON, for a rare isotope science project. The linear accelerator utilizes an electron cyclotron resonance (ECR) ion source for generating intense highly charged ion beams. A superconducting magnet system for a 28-GHz ECR ion source consists of six hexapole coils(More)
Electrical breakdown voltages of liquid nitrogen (LN<sub>2</sub>) are measured by dielectric experiments, according to the gap between electrodes, and the diameter of electrodes. Also, the distribution of electric field intensity at sparkover is calculated and analyzed by the finite element method. The dielectric characteristics of LN<sub>2</sub> depend on(More)
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