LINAC DESIGN FOR AN ARRAY OF SOFT X-RAY FREE ELECTRON LASERS Page: 3 of 3
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that after accounting for a compression factor of - 20, the
modulation period due to microbunching instability seenbunch length. (mm)
Figure 10. Peak current distribution at the end of the spreader
obtained in tracking of 1B macroparticels through the entire
machine beginning from the end of the injector using IMPACT.I I
I I
I I I
, I 10 035 0* 025 '02 C15 0i 005
bunch length, (mm)E
a) 4*Q/
I!
2 tCbunch length, (mm)
Figure 13. Normalized slice emittance at the end of the spreader
obtained in tracking of 1B macroparticels through the entire
machine beginning from the end of the injector using IMPACT.
Finally, Figure 14 shows the rms slice energy spread at
the end of the spreader. For the most part of the bunch it is
simply defined by the bunch compression and is not
affected by microbunching instability. The large increase
at the tail of the bunch is due to off-set of the central slice
energy seen in Figure 10.
C) 2S0OO
2)2Figure 11. Longitudinal phase space at the end of the spreader
obtained in tracking of 1B macroparticels through the entire
machine beginning from the end of the injector using IMPACT.
in Figure 11 is in a good agreement with analysis of the
gain of the microbunching instability performed on the
basis of the linear theory [9] (see, Figure 12).c 40
30
. 0
ao 500 1000 1100 2x00
Modulation period before compression. (nm)
Figure 12. Gain of the microbunching instability. Arrow
indicates modulation period obtained in macroparticle tracking
(after accounting for a compression factor).
Figure 13 shows the normalized slice emittance at the
end of the spreader which is the same as 0.45 m initial
emittance assumed in this simulation.bunch length, (mm)
Figure 14. Slice rms energy spread at the end of the spreader
obtained obtained in tracking of 1B macroparticels through the
entire machine beginning from the end of the injector using
IMPACT.
In conclusion, we have produce a design for an
accelerator satisfying performance requirements for soft
x-ray FEL array. Testing this design by particle tracking
indicates that all adverse collective effects are well
managed. This allows the electron beam transport from
injector to FELs without deterioration of the slice
emittance and slice energy spread.[1]
[2]
[3]
[4]
[5]
[6]
[7]
[8]
[9]REFERENCES
A. Zholents, CBP Tech. Note - 381, (2007).
M. Venturini , A. Zholents, NIM A, 593, 53(2008).
M. Cornacchia et. al., PRST-AB, 9, 120701(2006).
K. L. E Bane and P. Emma, Proc. Part. Acc. Conf.,
Knoxville, Tennessee, 4266(2005).
M. Borland,, APS Tech. Note LS-207, (2000).
M. Venturini, et al., PRST-AB, 10, 05403 (2007).
M. Dohlus, TESLA-FEL-2003-05, DESY, 2003.
J. Qiang, et. al., J. Comp. Phys. 163, 434 (2000).
S. Heifets, et al., PRST-AB, 5, 064401 (2002).U) SWO
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Zholents, Alexander A.; Kur, E.; Penn, G.; Qiang, Ji; Venturini, M. & Wells, R. P. LINAC DESIGN FOR AN ARRAY OF SOFT X-RAY FREE ELECTRON LASERS, article, September 22, 2008; Berkeley, California. (https://digital.library.unt.edu/ark:/67531/metadc898255/m1/3/: accessed April 19, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.