LCLS Conceptual Design Report - Stanford Synchrotron Radiation ...

〈(∆E/E 0 ) 2 〉 1/2 [%]
γε x [µm]
0.04
0.02
L C L S C O N C E P T U A L D E S I G N R E P O R T
CSR−induced rms energy spread accumulated
0
0 5 10 15 20 25 30 35
1
0.5
Bend−plane normalized emittance
0
0 5 10 15 20 25 30 35
S /m
Figure 7.37 Additional rms energy spread induced by CSR (top) and the normalized horizontal
emittance (bottom) along the DL2 bend system (1 st bend to 3 meters after 4 th bend).
(∆E/E 0 ) CSR [%]
CSR−induced Energy Gradient
0.1
0
−0.1
−0.2
−0.04 −0.02 0
s /mm
0.02 0.04
Figure 7.38 CSR-wakefield energy gradient along the bunch generated within DL2 bend system.
The total accumulated CSR-wakefield energy gradient along the bunch generated within the
DL2 bend system is shown in Figure 7.38. The emittance growth and energy spread is
concentrated at bunch head and tail and has little effect on beam parameters sliced on the scale of
A C C E L E R A T O R ♦ 7-63