Effects of Photoelectrons on Cold Cathode Gauges in KEKB Accelerator.

• SUETSUGU Yusuke

  High Energy Accelerator Research Organization

• HISAMATSU Hiromi

  High Energy Accelerator Research Organization

• KANAZAWA Ken-ichi

  High Energy Accelerator Research Organization

Bibliographic Information

Other Title

• ＫＥＫＢ加速器での冷陰極真空計に対する光電子の影響
• KEKB カソクキ デ ノ レイインキョク シンクウケイ ニ タイスル コウデンシ ノ エイキョウ

Abstract

Some cold cathode gauges (CCGs) in KEKB Accelerator show different behavior from other ones. These gauges have following characteristics : (1) The locations of these CCGs are limitted to just downstream side of bending magnets where the synchrotorn radiation is intense. (2) The discharge current is proportional to the beam current. (3) The discharge current is observed even without a permanent magnet of CCG. (4) The discharge current per unit beam current approaches to a constant value as the integrated beam current increases. From these characteristics, the observed abnormal discharge current of these CCGs is considered to be due to the photoelectrons generated by the synchrotron radiation. A simulation shows that the electrons are not generated inside of the beam chamber but inside the gauge chamber by reflected SR or accelerated photoelectrons that are produced inside the beam chamber. Attaching small dipole magnet at the neck of CCG port can remove the effect of secondary electrons.

Journal

• Shinku

  Shinku 43 (3), 235-238, 2000

  The Vacuum Society of Japan

Keywords

• Electrical and Electronic Engineering
• Surfaces, Coatings and Films
• Condensed Matter Physics

Details

• CRID: 1390001204063749760
• NII Article ID: 10004561592
• NII Book ID: AN00119871
• DOI: 10.3131/jvsj.43.235
• ISSN: 18809413
• ISSN: 05598516
• NDL BIB ID: 5360886
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I5360886
• Text Lang: ja
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed