An Rf-gun-driven recirculated linac as injector and FEL driver. Page: 1 of 11
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An Rf-Gun-Driven Recirculated Linac
as Injector and FEL Driver - ,
Ake Andersson, Mikael Eriksson, Sverker Werini OC L
MAX-Laboratory, University of Lund, Lund, Sweden 2 999
Sandra Biedron
Argonne National Laboratory, Advanced Photon Source, Argonne, IllinoisHenry Freund
Science Applications International Corporation, McLean, Virginia
A new pre-injector for the MAX-Laboratory is under design and construction. A thermionic rf gun, designed to operate at
medium currents with low back bombardment power, is under construction. The gun will, via a magnetic compressor and
energy filter, feed a recirculated linac consisting of two SLED-equipped structures giving 125 MeV each. The first will be
delivered in 1999. The system is aimed as a pre-injector for the existing storage rings at MAX-Lab, but will also open up
possibilities for a SASE FEL in the UV reaching above 100 MW below 100 nm.
Introduction
The injector systems at MAX-Lab are currently being upgraded. The 100-MeV racetrack microtron [1] that currently
feeds the two storage rings MAX I and MAX II will be replaced by a new injector system consisting of two 5.2-m, 3-
GHz acceleration sections of the DESY II type [2] and a SLED system [3] . Each section will give an energy gain of
125 MeV and the two sections will be recirculated once to give a total of 500 MeV. The linacs will be injected from a
newly designed 2.3-MeV thermionic rf gun. The total circumference of this system is 30 m or 100 ns. The electron gun
is equipped with a fast kicker magnet that allows a 100-ns-long electron beam to be accelerated in the linacs. Apart
from being used as a storage ring injector, the injection system will also open up new possibilities for its use as an
electron source for a SASE (Self-Amplified Spontaneous Emission) FEL tunable from the IR to the UV spectral
regions.
1. THE INJECTOR
1.1 Rf Gun
The gun is a V+'/+ 1 cell 3-GHz structure using a 6-mm-diameter cathode and having an input coupling hole and a
plunger hole in the main cavity. The gun layout is shown in Figure 1.
Figure 1. Gun layout (overall inner length 100 mm, maximum inner radius 40.69 mm) the Uitt manuscript has been crated
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-
1MAX-Lab, P.O. Box 118, S-221 00 Lund, Sweden. Email: sverker.werin@maxlab.lu.se Fax: 46-46-222 47 10 ing on its behalf, a paid-up, nonexclusive.
irrevocable worldwide license in said article
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Andersson, A.; Biedron, S.; Eriksson, M.; Freund, H. & Werin, S. An Rf-gun-driven recirculated linac as injector and FEL driver., article, August 23, 1999; Illinois. (https://digital.library.unt.edu/ark:/67531/metadc623323/m1/1/: accessed April 23, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.