Self-amplified spontaneous emission in Smith-Purcell free-electron lasers. Page: 1 of 16
This article is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided to UNT Digital Library by the UNT Libraries Government Documents Department.
Extracted Text
The following text was automatically extracted from the image on this page using optical character recognition software:
AN LAsc P-jl1( I
Self-Amplified Spontaneous Emission in
Smith-Purcell Free-Electron Lasers
Kwang-Je Kim and Su-Bin Song 1
Advanced Photon Source, Argonne National Laboratory, Argonne, IL 60439
Abstract
We present an analysis of a Smith-Purcell system in which a thin current sheet
of electrons moves above a grating surface in the direction perpendicular to the
grating grooves. We develop a complete theory for evolution of the electromagnetic
field and electron distribution in the exponential growth regime starting from the
initial electron noise and the incoming amplitude. The dispersion relation for the
complex growth rate for this system is a quadratic equation.
Key words: Smith-Purcell, FEL, SASE, grating
PA LS: 41.60.Cr, 41.60.-m. 42.79.Dj, 52.75.Ms The submitted manuscript has been create
by the University of Chicago as Operator o=
Argonne National Laboratory ("Argonne
under Contract No. W-31-109-ENG-38 with
the U.S. Department of Energy. The U.S.
Government retains for itself, and others act-
ing on its behalf, a paid-up, nonexclusive.
irrevocable worldwide license in said article
to reproduce, prepare derivative works, dis-
1 Introduction tribute copies to the public, and perform pub-
licly and display publicly, by or on behalf of
the Government.
Beginning with the work by Smith and Purcell [1], the radiation generated by
an electron beam passing over a grating surface has been studied for decades
[2-4]. Recently there has been a renewed interest in the Smith-Purcell sys-
tem with the observation of possible exponential gain in an experiment using
electron microscope beams [5,6].
In this paper, we study the Smith-Purcell system in the exponential gain
regime including self-amplified spontaneous emission (SASE). We study a sim-
plified system where the electrons are line charges oriented parallel to the di-
rection grooves and move perpendicular to the grating grooves. The electron
beam is furthermore assumed to be confined to a thin sheet. The configuration
is translationally invariant in the direction of the grooves, and is schematically
illustrated in Fig. 1.
1 E-mail: sbsong@aps.anl.govPreprint submitted to Elsevier Preprint
1 September 2000
Upcoming Pages
Here’s what’s next.
Search Inside
This article can be searched. Note: Results may vary based on the legibility of text within the document.
Tools / Downloads
Get a copy of this page or view the extracted text.
Citing and Sharing
Basic information for referencing this web page. We also provide extended guidance on usage rights, references, copying or embedding.
Reference the current page of this Article.
Kim, K. J. & Song, S. B. Self-amplified spontaneous emission in Smith-Purcell free-electron lasers., article, September 15, 2000; Illinois. (https://digital.library.unt.edu/ark:/67531/metadc725051/m1/1/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.