高スピン偏極度／高輝度・電子ビーム源

• 中西 彊

  名古屋大学・大学院理学研究科，素粒子宇宙物理学専攻

書誌事項

タイトル別名

• High Spin Polarization and High Brightness Electron Source
• コウスピン ヘンキョクド コウキド デンシ ビームゲン

抄録

A compact review of our research activities to improve various beam performances of spin polarized electron source, such as, 1) spin polarization, 2) quantum efficiency, 3) peak current density, 4) brightness, 5) beam energy resolution, 6) response time, and 7) NEA surface life time is given. In particular, our efforts toward higher brightness and high spin polarization electron source or LEEM using transmission photocathode are described in detail. The achievements are summarized as follows: A 20-keV gun was constructed with a transmission photocathode including an active layer of a GaAs-GaAsP superlattice. The photocathode illuminated by laser light with a spot diameter as small as 1.3 μm and a brightness of ∼2×10⁷ A·cm⁻²·sr⁻¹ (a reduced brightness of ∼1.0×10⁷ A·cm⁻²·sr⁻¹·V⁻¹) and a peak polarization of ∼90% were achieved at the same time for an extracted current of 5.3 μA. This brightness is still one order magnitude smaller than those of the W-field-emitters, but one order higher than those of LaB₆ emitters and three orders than those of conventional polarized electron sources.

収録刊行物

• 表面科学

  表面科学 29 (11), 672-681, 2008

  公益社団法人 日本表面科学会

キーワード

• spin polarized electron source
• laser photocathode
• polarization
• brightness
• NEA surface

詳細情報

• CRID: 1390001206457557888
• NII論文ID: 10024407549
• NII書誌ID: AN00334149
• DOI: 10.1380/jsssj.29.672
• ISSN: 18814743
• ISSN: 03885321
• NDL書誌ID: 9714050
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I9714050
• Web Site: http://www.jstage.jst.go.jp/article/jsssj/29/11/29_11_672/_pdf
• 本文言語コード: ja
• データソース種別:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可