Scientific Assessment of High-Power Free-Electron Laser Technology (2009) / Chapter Skim
Currently Skimming:
Appendix D: Acronyms and Glossary
Appendix D: Acronyms and Glossary
Pages 50-54
The Chapter Skim interface presents what we've algorithmically identified as the most significant single chunk of text within every page in the chapter.
Select key terms on the right to highlight them within pages of the chapter.
From page 50... ...
time in an electron gun. The quantum efficiency of the cathode can be degraded either through adsorption of foreign materials onto the surface or through desorption of cathode materials.
|
From page 51... ...
applied across plates as the accelerating gradient for the electrons extracted from the cathode surface; a typical accelerating voltage is 300-500 kV over about 12-14 cm until the gun exit DF deuterium fluoride; these lasers operate at a wavelength over a series of lines from 3.6 µm to 3.9 µm DOE Department of Energy emittance measure of beam quality that is related to the product of beam divergence and spot size ERL energy recovery linac FEL free-electron laser field emission the emission of electrons from the solid-state surface caused by applying high electric fields perpendicular to the surface FWHM full width at half maximum FPC fundamental power coupler "generation" The synchrotron radiation sources of the past and present can be defined as follows: nomenclature • First-generation machines are electron synchrotrons and storage rings that were built for other purposes -- for example, high-energy and nuclear physics -- but whose bending magnet radiation was parasitically used by synchrotron radiation "users." This radiation covered many wavelength regimes due to the nature of the bending magnet emission. In addition, the machines produced rather large photon source sizes as the electron beam emit tance was large and neither intended for nor ideal for synchrotron radiation applications.
|
From page 52... ...
• Next-generation light sources involve an optical gain mechanism, with the goal of trans verse and longitudinal optical coherence such as in a free-electron laser. halo "spreading" of the beam in linacs; it is a consequence of filamentation caused by nonlinear and time-dependent forces, and it increases the risk of beam losses HEL high-energy laser HGHG high-gain harmonic generation HOM higher-order mode; a cavity mode in the accelerator other than the desired acceleration mode IBSD ion-beam sputtered deposition JAERI Japan Atomic Energy Research Institute JLab Thomas Jefferson National Accelerator Facility LANL Los Alamos National Laboratory LCLS Linac Coherent Light Source (at the Stanford Linear Accelerator Center)
|
From page 53... ...
. quantum the number of electrons released compared to the number of photons absorbed efficiency RAFEL regenerative amplifier FEL; a hybrid FEL configuration with the combined features of an oscillator and a high-gain amplifier RF radio frequency rms root mean square SASE self-amplified spontaneous emission SDI Strategic Defense Initiative SLAC Stanford Linear Accelerator Center SRF gun superconducting RF gun, an electron gun that relies on an RF resonant cavity made from a superconducting material such as niobium cooled to a few degrees Kelvin, for example, to form the electric field gradient necessary to accelerate the electrons extracted from the cathode surface SSL solid-state laser thermal blooming atmospheric effect encountered by high-energy laser beams, which is the result of the nonlinear interaction of laser radiation with the propagation medium (typically air)
|
From page 54... ...
periodic transverse magnetic field causing the electrons in the beam to follow a sinusoidal path. UV ultraviolet VUV vacuum ultraviolet wavelength distance between repeating units of a propagating wave of a given frequency wiggler see undulator above (or undulator)
|
Key Terms
This material may be derived from roughly machine-read images, and so is provided only to facilitate research.
More
information on Chapter Skim is available.