F. Marhauser, EUROFEL WP5 collaboration meeting on simulation results, 02-03. Juni 2005, BESSY/Berlin Transverse Phase Space Optimization in a 1.625-cell SRF Photoinjector Gun Cavity o overview on different focussing methods proposed o simulation studies for a 1.625-cell photogun I) with solenoidal focussing II) with combined electric RF- and magnetic focussing o at 2.5 nC (i.e. BESSY-FEL design bunch charge) o at 1.0 nC („typical“ bunch charge)
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Transverse Phase Space Optimization in a 1.625-cell SRF Photoinjector Gun Cavity
Transverse Phase Space Optimization in a 1.625-cell SRF Photoinjector Gun Cavity. overview on different focussing methods proposed simulation studies for a 1.625-cell photogun I) with solenoidal focussing II) with combined electric RF- and magnetic focussing - PowerPoint PPT Presentation
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F. Marhauser, EUROFEL WP5 collaboration meeting on simulation results, 02-03. Juni 2005, BESSY/Berlin
Transverse Phase Space Optimization in a 1.625-cell SRF Photoinjector Gun Cavity
o overview on different focussing methods proposed
o simulation studies for a 1.625-cell photogun I) with solenoidal focussingII) with combined electric RF- and magnetic focussing
o at 2.5 nC (i.e. BESSY-FEL design bunch charge)
o at 1.0 nC („typical“ bunch charge)
F. Marhauser, EUROFEL WP5 collaboration meeting on simulation results, 02-03. Juni 2005, BESSY/Berlin
f0 = 1.3 GHz
bunch charge 1.0 nC
Eacc (~ 0.5*Emax) 25 MV/m
Ebeam 10.0 MeV
laser pulse length (FWHM)
(superposition of 3 Gaussian
laser pulses with = 3ps)
18 ps
laser spot radius 1.5 mm
thermal emittance th - mm mrad
n,rms @ 1.5m behind cathode2.28/0.98
(100 / 90 %) mm mrad
1 - RF Focussing
„RF FOCUSSING – AN INSTRUMENT FOR BEAM QUALITY IMPROVEMENT IN SUPERCONDUCTING RF GUNS“
V. Volkov (BINP), D. Janssen (FZR)
EPAC 2000
PARMELA simulation results
F. Marhauser, EUROFEL WP5 collaboration meeting on simulation results, 02-03. Juni 2005, BESSY/Berlin
2 - Magnetic Mode Focussing (+ RF Focusing)
„EMITTANCE COMPENSATION IN A SUPERCONDUCTING RF PHOTOELECTRON GUN BY A MAGNETIC RF FIELD“
D. JANSSEN (FZR), V. VOLKOV (BINP)
EPAC 2004
bunch charge 1.0 nC
Emax (~ 2*Eacc) 50 MV/m
Ebeam 8.82 MeV
TE-mode frequency 3.802 GHz
Bz,max 324 mT
Bs,max (below quench limit) 144 mT
laser pulse length (uniform) 20 ps
rise/fall time 1 ps
laser spot radius 1.3 mm
thermal emittance th - mm mrad
n,rms @ 4.44 m behind cathode 0.78-0.98 mm mrad
ASTRA simulation results
F. Marhauser, EUROFEL WP5 collaboration meeting on simulation results, 02-03. Juni 2005, BESSY/Berlin
bunch charge 1.0 nC
Emax 60 MV/m
Ebeam 6.5 MeV
Bz,max @ 0.36 m 300 mT
laser pulse length (uniform) 19.8 ps
laser spot radius 1.69 mm
working point position 3.3 m
n,rms @ WP ~2.2 mm mrad
Eacc 13 MV/m
thermal emittance th 0.5 mm mrad
n,rms @ 14m (after 8 x TESLA cavities (117 MeV)) ~ 1 mm mrad
3 - Split Photoinjector Concept
„AN ULTRA-HIGH BRIGTHNESS, HIGH DUTY FACTOR, SUPERCONDUCTING RF PHOTOINJECTOR“
M. FERRARIO (INFN-LNF), J.B. ROSENZWEIG, G. TRAVISH (UCLA), J. SEKUTOWICZ, W.D. MÖLLER (DESY)
EPAC 2004
PARMELA/HOMDYN simulations results
F. Marhauser, EUROFEL WP5 collaboration meeting on simulation results, 02-03. Juni 2005, BESSY/Berlin
w/o 3rd harmonic cavities
with 3rd harmonic cavities
- motivated by proposed BESSY Soft X-ray FEL project: