S2E in LCLS Linac M. Borland, Lyncean Technologies, P. Emma, C. Limborg, SLAC.
TTF2-s2e dogleg - DESY2005/10/24 · • s2e is lengthy procedure: 4 x ASTRA (including GUN + after...
Transcript of TTF2-s2e dogleg - DESY2005/10/24 · • s2e is lengthy procedure: 4 x ASTRA (including GUN + after...
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TTF2-s2e→dogleg→
ASTRA-Generator → see http://www.desy.de/xfel-beam/s2e/ttf2_v2.htmlASTRA → see http://www.desy.de/xfel-beam/s2e/ttf2_v2.html
= case 4ps gaussian laser, no 3.9 GHz cavity (E. Schneidmiller proposal)
convert to CSRtrack; add wakeCSRtrack (Eref = 124.425 MeV, r56 = 17.29 cm)convert to ASTRAASTRAconvert to CSRtrack; add wakeCSRtrack (Eref = 380 MeV, r56 = 10.0 cm)convert to ASTRAASTRAconvert to CSRtrack; add wakeCSRtrack (Eref =, r56 = 0.47 mm)
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the particles
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r56 of 1st BC (no CSR)
from Elegant file:reference momentum = 124.425 MeV/c1st BC: phi = pi/10 → r56 = -0.180717m
-r56/mm=180.7
-r56/mm=172.9
-r56/mm=175.3
the following simualtions:reference momentum = 124.425 MeV/cr56 := -0.172899m
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entrance 1st BC
matched to nominal optics
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after 1st BC (r56=-0.1729m)
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after 1st BC (r56=-0.1729m)
α
β
Nina; D4BC2 + 1m driftalpha=-0.17 -1.3beta=0.93m 2.4(ttf2-bc2-bc3-op1)
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ASTRA to 2nd BC: course mesh
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ASTRA to 2nd BC: fine mesh
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a mixture
before 2nd BClong. phasespace
after 2nd BCcurrent
fine mesh“mixture” course-fine mesh
better method: ASTRA merge option , Klaus Floettmann 21. October
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entrance 2nd BC (a mixture)
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entrance 2nd BC (a mixture)
α
β
Nina; D00982alpha=2.0beta=30.6m(ttf2-bc2-bc3-op1)
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after 2nd BC (r56=-0.099369m)
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after 2nd BC (r56=-0.099369m)
α
β
Nina; D14BC3 + 1m driftalpha=-0.29 -0.45beta =6.7m 7.4(ttf2-bc2-bc3-op1)
good agreement with pert. Theory→ essentially 1st order effects
centroid offsets extracted for further calculations !
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at 155m, 900 z-meshlines
careful convergence test still missing, but:
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at 155m, 500 z-meshlinesat 155m, 300 z-meshlines
at 155m, 900 z-meshlines
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at 155m, 300 z-meshlines at 155m, 500 z-meshlines
at 155m, 900 z-meshlines
Nina; ??? ( 141.505m)alpha=???beta =???m(ttf2-bc2-bc3-op1)
α
β
wrong optic in ASTRA file ???→ matching to “design” values
at entrance of dogleg
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entrance of dogleg: 900 z-meshlines, + Wakes (2 x module+LOLA) + matching
sub 1 µmσ =
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:! matching
α
β
(horizontal)
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dogleg (without sextupoles)
0eδ >
0eδ <0.4 m3.5o
0.3286 mk = 4.2485
0.3286 mk = -4.3689
1.6614 m
0.9214 m
r56 = 0.468 mmt566 = 54.8 mm
with sextupoles (not used in CSRtrack):r56 = 0.468 mmt566 = 17.8 mm
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1m after dogleg
sub 0.5 µmσ =(used for CSR calc.)
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1m after dogleg
6.414 -3.588
1m drift
α
β
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compression in dogleg much stronger than expected by r56 !?
CSRtrackreference energy = 450 MeV
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CSRtrack, without forcereference energy = 453.5 MeV
CSRtrack, without forcereference energy = 450 MeV
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1m after dogleg, ref. energy = 453.5 MeV
sub 0.5 µmσ =(used for CSR calc.)
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1m after dogleg
6.414 -3.588
1m drift
α
β
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particles in color
MeV /zp
c
µmz
MeV /zp
c
µmz
µmz
MeV /zp
cMeV /zp
c
µmz
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MeV /zp
c
µmz
MeV /zp
c
µmz
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conclusion, experiences
• s2e is lengthy procedure: 4 x ASTRA (including GUN + after dogleg)3 x CSRtrack6 x conversion and/or wakes
• dogleg to undulator + Genesis still missing• convergence test• automatization• improved ASTRA mesh; (but not user-friendly)• low energy (450MeV): SC effects before dogleg are important• compression in dogleg touchy; sextupoles should be considered