加速器
Online ISSN : 2436-1488
Print ISSN : 1349-3833
8 巻, 4 号
選択された号の論文の17件中1~17を表示しています
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解説
  • 小林 信一
    2012 年 8 巻 4 号 p. 202-209
    発行日: 2012/01/31
    公開日: 2023/03/01
    ジャーナル フリー

    Electrical breakdown in vacuum is a complicated phenomenon, since there are no gas particles to become carriers of breakdown currents. The breakdown characteristics are, therefore, fully influenced by surface conditions of electrodes and insulators. This article presents fundamental mechanisms of electrical breakdown in vacuum. It is pointed out that characterization of electrode surface condition is principally important and thus in situ surface analysis is necessary to reveal the electrical breakdown mechanism of a vacuum gap. An experimental system is introduced to carry out this in situ surface analysis and breakdown experiments. Some examples of surface precautions improving breakdown strength of a vacuum gap, such as in situ sputter cleaning, diamond turning to mirror finish, in situ heat treatment are given.

  • 小山 和義
    2012 年 8 巻 4 号 p. 210-217
    発行日: 2012/01/31
    公開日: 2023/03/01
    ジャーナル フリー

    Recent progress of a laser plasma particle accelerator is reviewed. After the success of mono-energetic electron accelerations, researches were focused to obtain a reproducibility and stability by adopting various electron injection techniques and plasma channels. Stabilities of output parameters have been improved 20–50% by controlling electron injection and plasma channel.

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