Electron sources for electron microsocpes
نویسندگان
چکیده
منابع مشابه
High Brightness Electron Sources
The production of unprecedentedly high brightness electron beams is a critical aspect of many applications, from free-electron lasers to advanced accelerators. The preferred method for obtaining these beams is the radiofrequency photoinjector. The physics and technology aspects of this device are reviewed here, along prospects for future progress in high-brightness beam development.
متن کاملPolarized Electron Sources
∗ Work supported by Department of Energy contract DE-AC03-765F00515. Polarized electron sources for high energy accelerators took a significant step forward with the introduction of a new laser-driven photocathode source for the SLC in 1992. With an electron beam polarization of >80% and with ~99% uptime during continuous operation, this source is a key factor in the success of the current SLC ...
متن کاملPolarized Electron Sources for Linear Colliders ”
A&TRACT Linear colliders require high peak current beams with low duty factors. Several methods to produce polarized e’ beams-for accelerators have been developed. The SLC, the first linear collider, utilizes a photocathode gun with a GaAs cathode. Although photocathode sources are probably the only er@ical alternative for the next generation of linear colliders, several problems remain to be s...
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A brief introduction to electron and ion sources for particle accelerators is given. Concentrating on the basic processes for the production of these particles, thermionic and photocathode production of electrons and the processes in Penning and electron cyclotron resonance ion sources are covered. Finally, negative ions are discussed.
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The status of the polarized electron source development program at SLAC will be reviewed. Emission currents of 60 A, corresponding to a space charge limited current density of 180 A/cm2. have been obtained from GaAs photocathodes. Electron beam polarization 20% greater than that obtainable from GaAs cathodes has been observed from multilayer &As-GaAlAs structures. Work in progress to produce hi...
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ژورنال
عنوان ژورنال: Vacuum Magazine
سال: 2015
ISSN: 2288-971X
DOI: 10.5757/vacmag.2.2.24