TEION KOGAKU (Journal of Cryogenics and Superconductivity Society of Japan)

Preface

[title in Japanese]

TAJIMA Setsuko

2021 Volume 56 Issue 3 Pages 117
Published: 2021
Released on J-STAGE: May 20, 2021

DOIhttps://doi.org/10.2221/jcsj.56.117

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Feature: Helium Recovery and Alternative Technologies Based on the Recent Helium Crisis Situation

[title in Japanese]

Naoko NAKAMURA

2021 Volume 56 Issue 3 Pages 118
Published: 2021
Released on J-STAGE: May 20, 2021

DOIhttps://doi.org/10.2221/jcsj.56.118

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Review Article

Toward Small Consumption of Helium with Recycling Activities at the Institute for Solid State Physics, The University of Tokyo

Shingo KATSUMOTO, Reiko SAGIYAMA, Hikaru TSUCHIYA, Minoru YAMASHITA

2021 Volume 56 Issue 3 Pages 119-124
Published: 2021
Released on J-STAGE: May 20, 2021

DOIhttps://doi.org/10.2221/jcsj.56.119

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At the Institute for Solid State Physics, The University of Tokyo, we were aware of the serious helium crisis that began in 2019 from an early stage. The institute is in the position of leading low temperature science and we have been working on a recycling project to mitigate the impact of the crisis. In this article, we will describe the helium crisis countermeasures that were implemented in 2019 and the current situation of the recycling activities.

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Focused Reviews

Introduction of Analytical Technology using Alternative Gas -Gas Chromatograph Mass Spectrometry-

HIRAMATSU Yoshiro

2021 Volume 56 Issue 3 Pages 125-129
Published: 2021
Released on J-STAGE: May 20, 2021

DOIhttps://doi.org/10.2221/jcsj.56.125

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Helium is a typical carrier gas for GC-MS systems and is a limited and valuable material. Here, we introduce alternative gas analysis technologies that utilize hydrogen and nitrogen. When hydrogen is utilized in a GC-MS system, it is more sensitive and has better separation than nitrogen. On other hand, in the case of nitrogen, it is easier to handle as compared to hydrogen. In this paper, basics gas chromatography is explained, and the gas analysis technologies using hydrogen and nitrogen as an alternative to helium gas are described. These technologies will contribute to reducing the consumption of helium.

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Purification Techniques in Helium Liquefaction System

KOYAMA Takehide, MIYAI Ryo, NOBUTOKI Minoru, KANEDA Satoshi

2021 Volume 56 Issue 3 Pages 130-134
Published: 2021
Released on J-STAGE: May 20, 2021

DOIhttps://doi.org/10.2221/jcsj.56.130

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In order to preserve our limited resources, helium recovery systems are employed in many research facilities. In these systems, the helium gas recovered from laboratories is dried and purified and then flows into a helium liquefier. This article describes features of several types of dryers and purifiers, and introduces some examples of the recovery system.

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Review Article

Helium Liquefier/Recondensation Unit with Cryocoolers

YOSHIDA Shigeru

2021 Volume 56 Issue 3 Pages 135-141
Published: 2021
Released on J-STAGE: May 20, 2021

DOIhttps://doi.org/10.2221/jcsj.56.135

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This is a review of compact liquefaction/recondensation equipment with cryocoolers, namely, GM-coolers and pulse tube cryocoolers. The improvement of liquefaction performance is remarkable since the advent of the 4-K pulse tube cryocooler. This article describes a brief history about 4-K cryocoolers and their liquefaction performance. Additionally, commercialized helium gas liquefaction/recondensation systems with cryocoolers are introduced and those specifications are shown.

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Technical Note

Reproduction Test of the Delamination of REBCO-coated Conductors from the Viewpoint of Coil Fabrication

MIZUNO Katsutoshi

2021 Volume 56 Issue 3 Pages 142-148
Published: 2021
Released on J-STAGE: May 20, 2021

DOIhttps://doi.org/10.2221/jcsj.56.142

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Since the degradation of a REBCO coil was reported, coil fabrication methods that can avoid delamination have been developed. Meanwhile, it is now possible to obtain various types of REBCO-coated conductors from manufacturers these days. It is unknown if there is a coil fabrication method that matches all of the REBCO-coated conductors. When a new coated conductor is to be used for coil fabrication, some preliminary tests should be carried out in advance. We propose a chisel test that reproduces delamination of the coated conductor in a REBCO coil.

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Cryogenic Group

Yagai Lab. in department of engineering and applied science, faculty of science and technology, Sophia University

YAGAI Tsuyoshi, MORITA Taro

2021 Volume 56 Issue 3 Pages 149-150
Published: 2021
Released on J-STAGE: May 20, 2021

DOIhttps://doi.org/10.2221/jcsj.56.149

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Saloon

[title in Japanese]

HIRAI Hirokazu

2021 Volume 56 Issue 3 Pages 151
Published: 2021
Released on J-STAGE: May 20, 2021

DOIhttps://doi.org/10.2221/jcsj.56.151

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[title in Japanese]

AWAJI Satoshi

2021 Volume 56 Issue 3 Pages 152
Published: 2021
Released on J-STAGE: May 20, 2021

DOIhttps://doi.org/10.2221/jcsj.56.152

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