numerical modeling of flash and the european xfel · 2012-09-24 · igor zagorodnov | icap 2012|...
TRANSCRIPT
Start-to-End Simulations
Numerical Modeling of FLASH and the European XFEL
Igor Zagorodnov
Deutsches Elektronen Synchrotron,Hamburg, Germany
S2E Meeting, DESY24. September 2012
Igor Zagorodnov| ICAP 2012| 22. August 2012 | Seite 2
Content
� motivation
� FLASH simulations
� XFEL simulations
� tools, internet presence and publications
� challenges
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Motivation
�to verify the facility design and to improve it�to explain facility performance and to improve it�to develop new ideas, facilities etc.
Why do we need S2E simulations?
accelerator undulator
laser light
Igor Zagorodnov| ICAP 2012| 22. August 2012 | Seite 4
Motivation
�to reproduce the measurements�to predict the measurements
Can we trust the S2E simulations?
Yes! If we are able
Igor Zagorodnov| ICAP 2012| 22. August 2012 | Seite 5
FLASH Simulations
gun accelerator undulator laboratory
Igor Zagorodnov| ICAP 2012| 22. August 2012 | Seite 6
FLASH Simulations
�detailed simulation of the whole facility�simulation of experiments (triangular profile)�simulations of measurements (weak
compression, spike mode)� longitudinal wakes are included�BBA, microbunching, trajectory jitter etc?
Already done
Igor Zagorodnov| ICAP 2012| 22. August 2012 | Seite 7
FLASH Simulations
�more accurate simulations without suspicious steps (matching, shifting of slice centers etc.)
�to reproduce the LOLA measurements at FLASH for average and strong compression
�to explain the SASE dependence on ACC1 gradient
�to include the transverse wakes
Has to be done (short term)
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XFEL Simulations
Layout
1 130MeVE =1,1M
Gun
1,3M
2M 3M 4M
LH
DL 1BC 2BC 3BC2 700MeVE = 3 2400 MeVE = 4 14 /17.5GeVE =
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XFEL Simulations
�detailed simulation of the facility up to the collimation section
�simulation of different compression scenarious
� longitudinal wakes partially included�BBA, microbunching, quad errors, etc?
Already done
Igor Zagorodnov| ICAP 2012| 22. August 2012 | Seite 10
XFEL Simulations
�simulations of the whole facility�more accurate simulations without suspicious
steps (matching, shifting of slice centers etc.)�simulations of non-standart scenarious
(different charges in the train etc.)�tollerance studies
Has to be done (short term)
Igor Zagorodnov| ICAP 2012| 22. August 2012 | Seite 11
Tools, Internet Presence and Publications
�convertors�fast trackers�manuals, tests, examples
Tools
�tools �results documented�reproducibility of the results
Internet Presence
� internal reports� in referred journals
Publications
Igor Zagorodnov| ICAP 2012| 22. August 2012 | Seite 12
Challenges
� simulation of FLASH II� simulation and explanation of XFEL performance� plasma experiments at FLASH
� the simulations has to checked through experiments� we have to be able to reproduce the measurements� we have to be able to predict the measurements
We have to continue the accelerator code development!
Igor Zagorodnov| ICAP 2012| 22. August 2012 | Seite 13
Challenges
The European XFEL Machine FAQ?
https://slacportal.slac.stanford.edu/sites/lclscore_public/Lists/LCLS_FAQ/FAQ.aspx
See, for example, LCLS Machine FAQ
� What is the photon energy range and how long does it take to switch?� What is the highest pulse energy available (number of photons in the
pulse) and how does it vary with photon energy and pulse length?� What is the x-ray pulse length, how long does it take to change it, and
how does the pulse energy and peak power vary with pulse length?� How does the x-ray transverse beam size vary with photon energy and
electron peak current settings?� What are the temporal characteristics of the x-ray pulse, including
number of spikes, spike duration, peak power in each spike, and how does this vary with photon energy and peak current?