Beam Conditioning for FELs: Consequences and Methods Page: 5 of 28
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2.1 VISA
Results are shown in Figure 1 for various emittances at or above the nominal value, for
both conditioned and unconditioned beams. The optimum gain length is roughly 16 cm.
It is seen that at nominal values the performance is not limited by emittance, and
conditioning has little effect until the emittance is increased by a factor of four.14
C)
0.1e+9 r
le+7a- O o o o
le+E il e+6
1e+5 0
r o
o x x
x
/e+ x x e
x x xEN = 2 m, cond
xx
le+2 xx XN
xxx XN=4 m, con
le+1 *-s lxx ENEN = s m, con
1e+0 L -.-
0 0.52 1.5 2 2.5 3 3.5
2 {~)=2gm
[itioned
=4 m
ditioned
=8d m
[itionedx
Figure 1
Radiation power as a function of undulator length in the VISA FEL.
Conditioned and unconditioned beams at different emittances are compared.le+9 r
k
C)
Cle+7 ,
le+6
le+5
le+4
le+3 ec-
le+2 L
0S-
ab EN = 2m a
EN = 2 pm, conditioned
EN=4 m20
EN = 4 1m, conditioned
40 60 80 100 120
Z. {r")140
x x
Figure 2
Radiation power as a function of undulator length in the Soft X-Ray FEL.
Conditioned and unconditioned beams at different emittances are compared.5
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Wolski, Andrzej; Penn, Gregory; Sessler, Andrew & Wurtele, Jonathan. Beam Conditioning for FELs: Consequences and Methods, report, October 9, 2003; Berkeley, California. (https://digital.library.unt.edu/ark:/67531/metadc734852/m1/5/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.