Journal of High Pressure Institute of Japan
Online ISSN : 1347-9598
Print ISSN : 0387-0154
ISSN-L : 0387-0154
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Volume 38, Issue 2
Displaying 1-5 of 5 articles from this issue
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  • Outlook of Vacuum Technolgy in Ultra-High and Extreamely High Vacuum
    Masanori KOBAYASHI
    2000 Volume 38 Issue 2 Pages 68-72
    Published: March 25, 2000
    Released on J-STAGE: August 05, 2010
    DOIhttps://doi.org/10.11181/hpi1972.38.68
    JOURNAL FREE ACCESS
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    Progress of vacuum science and vacuum techniques in Ultra High Vacuum region is described briefly, and motivations and researches for getting Extreame High Vacuum are presented with their future applications.
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  • Realization and measurement method of UHV/XHV condition
    Shingo ICHIMURA
    2000 Volume 38 Issue 2 Pages 73-84
    Published: March 25, 2000
    Released on J-STAGE: August 05, 2010
    DOIhttps://doi.org/10.11181/hpi1972.38.73
    JOURNAL FREE ACCESS
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    Curent technologies to establish UHV and XHV conditions and present methods to measure UHV/XHV conditions were summarized and discussed. From the view point of UHV/XHV genetarion, the importance of controlling outgassing from vacuum chambers was first explained based on the equation of evacuation. Then several methods effective to reduce the outgassing rate were introduced. Those methods are application of electrochemical polishing, vacuum pre-baking, BN and TiN coating on SUS, and also the adoption of other materials than SUS such as aluminum and copper. The outgassing from pumping system and also the reduction of it were also discussed. As to UHV/XHV measurement, several principal problems associated with XHV measurement were first discussed, which were followed by the introduction of new XHV gauges and new measurement methods developed to overcome those problems.
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  • Ultrahigh Vacuum and Extreme High Vacuum Materials
    Yuichi Ishikawa
    2000 Volume 38 Issue 2 Pages 85-94
    Published: March 25, 2000
    Released on J-STAGE: August 05, 2010
    DOIhttps://doi.org/10.11181/hpi1972.38.85
    JOURNAL FREE ACCESS
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    Materials used for ultrahigh to extreme high vacuum (10-7-10-10Pa) applications are described in terms of their vacuum related properties such as outgassing and permeation characteristics. Materials discussed here are metals, glasses, ceramics, plastics and elastomers.
    In order to attain ultrahigh to extremehigh vacuum, outgassing rates must be reduced to the order of 10-9-10-11Pam3/sm2. Such an order of outgassing rates is usually realized by baking at temperatures 120-300°C. The effect of baking and surface modification on the outgassing rate is given in detail for major vacuum chamber materials, stainless steels and aluminum alloys.
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  • High Energy Accelerator Reserch Organization
    Yoichiro HORI
    2000 Volume 38 Issue 2 Pages 95-105
    Published: March 25, 2000
    Released on J-STAGE: August 05, 2010
    DOIhttps://doi.org/10.11181/hpi1972.38.95
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    The vacuum technology is one of bases of accelerator engineering. Every accelerator requires an ultra-high vacuum condition in order to achieve a long beam lifetime. This article describes the status and problems of the vacuum system, mainly of high-energy synchrotrons where both the outgassing and heat load is most severe because of intense synchrotron radiation.
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  • High Speed Vacuum Pumping Cryopump
    Toshihisa OKUYAMA
    2000 Volume 38 Issue 2 Pages 106-114
    Published: March 25, 2000
    Released on J-STAGE: August 05, 2010
    DOIhttps://doi.org/10.11181/hpi1972.38.106
    JOURNAL FREE ACCESS
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    High speed vacuum pumping cryopumps for neutral beam injection heating system are presented. Cryo-condensation pumps had been mainly used in large vacuum devices with high gas load and high vacuum operation. However, recently cryosorption pumps with GM cryocooler have been developed for high speed vacuum pump. Cryo-condensation pump is tough to high heat load, on the other hand cryo sorption pump is easy to operate. The features of these two types of cryopump are explained.
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