热门站点| 世界资料网 | 专利资料网 | 世界资料网论坛
收藏本站| 设为首页| 首页

Superlattice Photocathodes for Accelerator-Based Polarized Electron Source Applications

作者:科技文献资料网 时间:2017-06-24 11:44:58  浏览:8136   来源:科技文献资料网
下载地址: 点击此处下载
[唯一标识符]:CDSTIC.DOE.10001
[文献来源]:美国能源部报告数据库
[文献类型]:科技报告
[资源原始索取号]:OSTI ID: 10001
[标题]:Superlattice Photocathodes for Accelerator-Based Polarized Electron Source Applications
[作者]:Clendenin, James E
[机构]:Stanford Linear Accelerator Center, Menlo Park, CA (US)
[文摘]:A major improvement in the performance of the SLC was achieved with the introduction of thin strained-layer semiconductor crystals. After some optimization, polarizations of 75-85% became standard with lifetimes that were equal to or better than that of thick unstrained crystals. Other accelerators of polarized electrons, generally operating with a much higher duty factor, have now successfully utilized similar photocathodes. For future colliders, the principal remaining problem is the limit on the total charge that can be extracted in a time scale of 10 to 100 ns. In addition, higher polarization is critical for exploring new physics, especially supersymmetry. However, it appears that strained-layer crystals have reached the limit of their optimization. Today strained superlattice crystals are the most promising candidates for better performance. The individual layers of the superlattice can be designed to be below the critical thickness for strain relaxation, thus in principle improving the polarization. Thin layers also promote high electron conduction to the surface. In addition the potential barriers at the surface for both emission of conduction-band electrons to vacuum and for tunneling of valence-band holes to the surface can be significantly less than for single strained-layer crystals, thus enhancing both the yield at any intensity and also decreasing the limitations on the total charge. The inviting properties of the recently developed AlInGaAs/GaAs strained superlattice with minimal barriers in the conduction band are discussed in detail.
[关键词]:43 PARTICLE ACCELERATORS; 36 MATERIALS SCIENCE ; STANFORD LINEAR COLLIDER; ELECTRON SOURCES; PHOTOCATHODES; POLARIZATION; SUPERLATTICES; SUPERSYMMETRY; ELECTRON EMISSION; ALUMINIUM ARSENIDES; INDIUM ARSENIDES; GALLIUM ARSENIDES
[出版时间]:1999 Mar 22
[出版年份]:1999
[报告号]:SLAC-PUB-8052
[合同号]:AC03-76SF00515
[主办机构]:USDOE Office of Energy Research (ER) (US)
[来源]:Technical Report
[来源关系]:PBD: 22 Mar 1999
[覆盖领域]:Topical
[国别]:United States
[总页数]:4


下载地址: 点击此处下载
[唯一标识符]:CDSITC.AEROSPACE.N89-11918
[文献来源]:美国航空航天数据库(aerospace)
[资源原始索取号]:N1989-11918; Reference AN: N89-11918
[标题]:Environmental fate and effects of shale-derived jet fuel (Final Report, Oct. 1984 - Mar. 1986)
[作者]:PRITCHARD P H; MAZIARZ T P; MUELLER L H; BOURQUIN A W
[文摘]:Tests were conducted to compare the environmental fate of shale oil-derived jet fuel with that of petroleum-derived jet fuel. These tests included chemical characterization of the fuels and the water-soluble fraction of each fuel, as well as measurement of volatilization and biodegradation rates in laboratory systems designed to simulate three disparate aquatic environments. No major differences in the volatilization and biodegradation rates of the two fuels were found. Differences in composition were generally small and should not cause the behavior of the fuels in aquatic environments to differ. (GRA)
[关键词]:BIODEGRADATION ; ENVIRONMENT EFFECTS; JET ENGINE FUELS; PETROLEUM PRODUCTS; VOLATILITY ; ENVIRONMENTAL LABORATORIES; RATES PER TIME; SHALES
[出版年份]:1988
[专业领域]:PROPELLANTS AND FUELS
[唯一标识符]:CDSTIC.ISTP.560608
[文献来源]:科学技术会议录索引(ISTP)
[文献类型]:科技会议
[标题]:SUPERRESOLUTION FROM AN OMNIDIRECTIONAL IMAGE SEQUENCE
[作者]:H NAGAHARA;Y YAGI;M YACHIDA
[出版单位]:I E E ENEW YORK
[ISSN_ISBN]:0-7803-6456-2
[会议名称]:26th Annual Conference of the IEEE-Industrial-Electronics-Society,NAGOYA, JAPAN,October 22-28, 2000
[来源]:IECON 2000: 26TH ANNUAL CONFERENCE OF THE IEEE INDUSTRIAL ELECTRONICS SOCIETY, VOLS 1-4 - 21ST CENTURY TECHNOLOGIES AND INDUSTRIAL OPPORTUNITIES;IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS;IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS,pp 2559-2564
[编辑者]:CIEEE
[主办单位]:IEEE Ind Electr Soc
[地址]:H NAGAHARA,OSAKA_UNIV, GRAD SCH ENGN SCI, 1-3 MACHIKANEYAMA CHUO, TOYONAKA, OSAKA 5608531, JAPAN
[专业领域]:ENGINEERING, INDUSTRIAL,ENGINEERING, ELECTRICAL & ELECTRONIC,AUTOMATION & CONTROL SYSTEMS,COMPUTER SCIENCE, ARTIFICIAL INTELLIGENCE,INSTRUMENTS & INSTRUMENTATION

版权声明:所有资料均为作者提供或网友推荐收集整理而来,仅供爱好者学习和研究使用,版权归原作者所有。
如本站内容有侵犯您的合法权益,请和我们取得联系,我们将立即改正或删除。
信息产业部备案号:京ICP备09025792号