High-efficient photocathode for high-brightness electron s ource and the coherence

2011 Fiscal Year Final Research Report

• Project/Area Number: 22740157
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: Nagoya University
• Principal Investigator: KUWAHARA Makoto 名古屋大学, エコトピア科学研究所, 特任講師 (50377933)
• Project Period (FY): 2010 – 2011
• Keywords: 加速器 / 半導体光物性 / 量子スピン / 量子デバイス

Research Abstract

We have achieved a highly quantum efficiency(QE) and a robustness using a wide-band-gap semiconductor. A QE of InGaN-GaN superlattice is about 1. 5% in a wavelength of 300 nm, which is tenfold higher than an ordinal photocathode such as GaAs-GaAsP superlattice. Moreover, we have also realized a high durability against residual molecules in a vacuum using the wide-band-gap semiconductor photocathode.

Research Products

• [Journal Article] Development of Spin-Polarized and Pulsed TEM (2012)
  • Author(s): M Kuwahara, F. Ichihashi, S. Kusunoki, Y Takeda, K Saitoh, T Ujihara, H Asano, T. Nakanishi, N Tanaka
  • Journal Title: J. Phys.: Conf. Ser
  • Peer Reviewed
• [Journal Article] Mean Transverse Energy Measurement of Negative Electron Affinity GaAs-Based Photocathode (2012)
  • Author(s): S. Matsuba, Y. Honda, X. G. Jin, T. Miyajima, M. Yamamoto, T. Uchiyama, M. Kuwahara, Y. Takeda
  • Journal Title: Jpn. J. Appl. Phys Volume: Vol.51 Pages: 046402
  • Peer Reviewed
• [Journal Article] Dark lifetime degradation of GaAs photo-cathode at higher temperature (2011)
  • Author(s): M. Kuriki, C. Shonaka, H. Iijima, D. Kubo, H. Okamoto, H. Higaki, K. Ito, M. Yamamoto, T. Konomi, S. Okumi, M. Kuwahara, T. Nakanishi
  • Journal Title: Nucl. Instr. and Meth Volume: A637 Pages: S87-S90
  • Peer Reviewed
• [Journal Article] Development of spin-polarized transmission electron microscope (2011)
  • Author(s): M. Kuwahara, Y. Takeda, K. Saitoh, T. Ujihara, H. Asano, T. Nakanishi, and N Tanaka
  • Journal Title: J. Phys.: Conf. Ser Volume: 298 Pages: 012016
  • Peer Reviewed
• [Journal Article] Development of a 500-kV photocathode DC gun for ERLs (2011)
  • Author(s): N Nishimori, R Nagai, M Yamamoto, Y Honda, T Miyajima, H Iijima, M Kuriki, M Kuwahara, S Okumi, T Nakanishi, and R Hajima
  • Journal Title: J. Phys.: Conf. Ser Volume: 298 Pages: 012005
  • Peer Reviewed
• [Presentation] Injection system of spin-polarized transmission microscopy (2011)
  • Organizer: International Symposium on EcoTopia Science
  • Place of Presentation: Nagoya
  • Year and Date: 2011-09-11
• [Presentation] Development of spin-polarized and pulsed TEM (2011)
  • Organizer: Electron Microscopy and Analysis Group Conference
  • Place of Presentation: Birmingham UK
  • Year and Date: 2011-06-09
• [Presentation] スピン偏極パルスTEM用電子源と照射系の開発 (2011)
  • Organizer: 日本顕微鏡学会第67回学術講演会
  • Place of Presentation: Fukuoka, Japan
  • Year and Date: 2011-05-16
• [Presentation] Super lattice photocathode development for low emittance (2010)
  • Organizer: Photocathode Physics for Photo in jectors, Brookhaven National Laboratory
  • Place of Presentation: NY, USA
  • Year and Date: 20101012-14
• [Presentation] Development of spin-polarized transmission microscope (2010)
  • Organizer: Workshop on Sources of Polarized Leptons and High Brightness Electron Beam(PESP2010)
  • Place of Presentation: Bonn, Germany
  • Year and Date: 20100921-24
• [Presentation] Pulsed spin-polarized electron source toward a transmission electron microscope (2010)
  • Organizer: 17th International Microscopy Congress 17th(IMC17)
  • Place of Presentation: Rio De Janeiro, Brazil
  • Year and Date: 20100919-24
• [Presentation] スピン偏極パルスTEM用電子源の特性評価 (2010)
  • Organizer: 日本電子顕微鏡学会2010
  • Place of Presentation: Nagoya, Japan
  • Year and Date: 20100523-26