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INEX Simulations of the Optical Performance of the AFEL*
John C. Goldstein, Tai-Sen F. Wang, and Richard L. Sheffield
Group X-1, MS F645
Los Alamos National Laboratory
Los Alamos, New Mexico 87545
(505) - 667 -7281
(.505) - 665 - 3389 (FAX)
ABSTRACT
The AFEL (Advanced Free-Electron Laser) Project at Los Alamos National Laboratory is pres-
ently under construction. The project's goal is to produce a very high-brightness electron beam
which will be generated by a photocathode injector and a 20 MeV rf-linac. Initial laser experi-
ments will be performed with a 1-cm-period permanent magnet wiggler which will generate in-
tense optical radiation near a wavelength of 3.7 pm. Future experiments will operate with
"slotted-tube" electromagnetic wigglers (formerly called "pulsed-wire" wigglers). Experiments at
both fundamental and higher-harmonic wavelengths are planned. This paper presents results of
INEX (Integrated Numerical EXperiment) simulations of the optical performance of the AFEL.
These simulations use the electron micropulse produced by the accelerator/beam transport code
PARMELA in the 3-D FEL simulation code FELEX.
1.0 Introduction.
The AFEL Project of the Los Alamos National Laboratory is intended to demonstrate that a very
high-brightness electron beam can be generated in a relatively compact system by using a third-
generation photocathode/rf-linac. The electron beam will first be used in a relatively conservative
FEL oscillator (which is the primary topic of this paper) which will operate at an optical wave-
length of about 3.7 pm using a permanent magnet wiggler with a 1-cm period. Further details of
the design and expected performance of the accelerator can be found in [1]. The beam transport
system from the end of the linac through the wiggler to the beam dump is discussed in detail in
[2]. The extremely high brightness of the electron beam requires a new type of wiggler to fully ex-
ploit this characteristic for FEL oscillator operation. Such a new class of wigglers, previously
called "pulsed-wire wigglers" but now renamed "slotted-tube wigglers" to more accurately reflect
their construction, has been suggested by R. W. Warren and is discussed by him in [3].
In this work, we shall present a schematic layout of the experimental components of the AFEL
and leave a detailed discussion of each one to the above-mentioned papers [1] - [3]. We then shall
*Work performed under the auspices of the U. S. Department of Energy and funded by a Los
Alamos Special Supporting Research Initiative.
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Goldstein, J.C.; Wang, T.S.F. & Sheffield, R.L. INEX simulations of the optical performance of the AFEL, article, January 1, 1991; New Mexico. (https://digital.library.unt.edu/ark:/67531/metadc1055743/m1/2/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.