Filamentation at SLM5F02 in Simulation July 22 2011 C Tennant Procedure PARMELA model of gun Drive laser parameters based on measurements assumes ideal distribution 350 keV DC photocathode gun ID: 443645
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Slide1
Observations of Beam Filamentation at SLM5F02 in Simulation
July 22
, 2011
C. TennantSlide2
Procedure
PARMELA model of gun
Drive laser parameters based on measurements, assumes ideal distribution
350
keV
DC photocathode gun
Bunch charge of 135
pC
, push 300K particles
PARMELA model of merger
Use Excel (no space charge) to set quads for match to
linac
Tweak quads to improve match in PARMELA (with space charge)
PARMELA model of the
linac
(acceleration)
Accelerate 10° before crest
Space charge effects still appreciable in first module, use Excel to set transverse match in the triplets (where space charge is small)
elegant
model of the
recirculator
include 1D CSR model and implement “
csrdrifts
” (allows CSR wake to propagate beyond dipole)
Run to middle of second
p
-bend
SLM5F02Slide3
Recall: Beam-based Measurements
(view in Slideshow mode to view animated GIF)Slide4
s
t,wiggler
= 418.7
fs
under-compressedSlide5
s
t,wiggler
= 343.7
fs
under-compressedSlide6
s
t,wiggler
= 269.2
fs
under-compressedSlide7
s
t,wiggler
= 195.5
fs
under-compressedSlide8
s
t,wiggler
= 126.0
fs
under-compressedSlide9
s
t,wiggler
= 73.9
fs
fully compressedSlide10
s
t,wiggler
= 83.0
fs
over-compressedSlide11
s
t,wiggler
= 142.2
fs
over-compressedSlide12
s
t,wiggler
= 213.6
fs
over-compressedSlide13
s
t,wiggler
= 288.3
fs
over-compressedSlide14
s
t,wiggler
= 364.6
fs
over-compressedSlide15
Energy and st
vs
QT2F08/9 Strength
over-compressed
under-compressed