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COMPACT SYNCHROTRON RADIATION SOURCES USING RF-GUN AND LASER-ELECTROMAGNETIC FIELD

使用射频枪和激光电磁场的紧凑型同步辐射源

基本信息

批准号：
11354002
负责人：
KOBAYAKAWA Hisashi
金额：
$ 23.8万
依托单位：
NAGOYA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2002
项目状态：
已结题

项目摘要

We have carried out a basic study for the rf-gun system toward construction of the compact synchrotron radiation source using interaction of high density electron beam with high electromagnetic field of lasers.<Constructioin of a microwave system.>____An rf-laser gun, a high voltage power supply for klystron, a high-power microwave transmission system for 2856MHzand beam transport system were constructed.<Basic studies of photo-cathodes were carried out in order to obtain high performance beam.>____High quantum efficiencies (QE) of 10% were obtained for the Cesium-Telluride photo-cathodes under the ultra-high vacuum condition. Effects on the incident photon polarization and on the materials used for the bases were carefully investigated. GaAs/GaAsP superlattices which have12-32 layers of 2-4nm were fabricated using the MOCVD method. We have studied systematically characteristics of superlattice-photo-cathodes, such as on QE and on the spin polarization of emitted electrons. High values of QEs and polarization were obtained.<Fabrication of ultra-clean copper surface to reduce dark-current emission.>____The current from copper electrodes treated by four different types of surface cleaning procedures was measured under DC high gradient condition. A field gradient of 47MV/m was achieved with 1nA of dark current.

本文对利用高密度电子束与激光强电磁场相互作用构建紧凑型同步辐射源的射频炮系统进行了基础研究。<微波系统的构造。>____构建了射频激光枪、速调管高压电源、2856mhz高功率微波传输系统。为了获得高性能光束，进行了光电阴极的基础研究。在超高真空条件下，碲化铯光电阴极获得了10%的高量子效率（QE）。对入射光子偏振和基底材料的影响进行了仔细的研究。采用MOCVD法制备了12-32层2-4nm的GaAs/GaAsP超晶格。我们系统地研究了超晶格光电阴极的特性，如QE和发射电子的自旋极化。获得了较高的QEs和极化值。<制备超净铜表面，减少暗电流发射。>____在直流高梯度条件下，测量了四种不同表面清洗方法对铜电极产生的电流。当暗电流为1nA时，电场梯度为47MV/m。