ICAP2012 - List of Authors (Dohlus, M.)

Paper

Title

Page

Preliminary Study of Single Spike SASE FEL Operation at 0.26 Nanometers Wavelength for the European XFEL

253

B. Marchetti, M. Krasilnikov, F. Stephan
DESY Zeuthen, Zeuthen, Germany
M. Dohlus, Y.A. Kot, I. Zagorodnov
DESY, Hamburg, Germany
J. Rönsch-Schulenburg
Uni HH, Hamburg, Germany

The production of ultra-short (fs or sub-fs long), high power, radiation pulses in the X-ray spectral region, showing a single spike spectrum, represents a challenge for many existent SASE- FELs [1, 2]. In order to realize single spike operation the length of the electron bunch after compression must be extremely small [3] (less than a micrometer) and the consequent degradation of its emittance has not to suppress the radiation production. Several technical restrictions, such as limits of diagnostics for small charges, RF jitter and micro-bunching instabilities play an important role in the choice of the operation working point. In this paper we are going to study the feasibility of single spike or few spikes lasing for bunches with charge of tens of pC in the European XFEL facility giving some preliminary results concerning the choice of the working point.
[1] J.B. Rosenzweig et al., NIM A 593 (2008) 39-44
[2] S. Reiche et al., NIM A 593 (2008) 45-48
[3] R. Bonifacio et al., PRL vol. 73 n.1 (1994)

Slides THACC3 [1.401 MB]

THADI1

Multilevel Optimization of FELs

M. Dohlus
DESY, Hamburg, Germany

The operation of free-electron lasers with high performance depends on the design of the facility and on the choice of working points. Both are based on numerical simulations of beam dynamics. Such tracking calculations of charged particles in electromagnetic fields require the simultaneous solution of the equation of motion and of Maxwell’s equations. The effort for high level models, that consider physical effects from first principles, is limited by the capabilities of modern computer clusters. The resolution and precision is chosen so that a result is achieved in hours, days or weeks. On the other hand, many fine details and effects can be omitted at the beginning or taken into account analytically. Such simple models allow fast scans to be carried out that deliver the desired results in minutes. Of course, the results of the simple models should later be checked and modified with the full one.

Slides THADI1 [4.567 MB]

Paper	Title	Page
THACC3	Preliminary Study of Single Spike SASE FEL Operation at 0.26 Nanometers Wavelength for the European XFEL	253
	B. Marchetti, M. Krasilnikov, F. Stephan DESY Zeuthen, Zeuthen, Germany M. Dohlus, Y.A. Kot, I. Zagorodnov DESY, Hamburg, Germany J. Rönsch-Schulenburg Uni HH, Hamburg, Germany
	The production of ultra-short (fs or sub-fs long), high power, radiation pulses in the X-ray spectral region, showing a single spike spectrum, represents a challenge for many existent SASE- FELs [1, 2]. In order to realize single spike operation the length of the electron bunch after compression must be extremely small [3] (less than a micrometer) and the consequent degradation of its emittance has not to suppress the radiation production. Several technical restrictions, such as limits of diagnostics for small charges, RF jitter and micro-bunching instabilities play an important role in the choice of the operation working point. In this paper we are going to study the feasibility of single spike or few spikes lasing for bunches with charge of tens of pC in the European XFEL facility giving some preliminary results concerning the choice of the working point. [1] J.B. Rosenzweig et al., NIM A 593 (2008) 39-44 [2] S. Reiche et al., NIM A 593 (2008) 45-48 [3] R. Bonifacio et al., PRL vol. 73 n.1 (1994)
	Slides THACC3 [1.401 MB]

THADI1	Multilevel Optimization of FELs
	M. Dohlus DESY, Hamburg, Germany
	The operation of free-electron lasers with high performance depends on the design of the facility and on the choice of working points. Both are based on numerical simulations of beam dynamics. Such tracking calculations of charged particles in electromagnetic fields require the simultaneous solution of the equation of motion and of Maxwell’s equations. The effort for high level models, that consider physical effects from first principles, is limited by the capabilities of modern computer clusters. The resolution and precision is chosen so that a result is achieved in hours, days or weeks. On the other hand, many fine details and effects can be omitted at the beginning or taken into account analytically. Such simple models allow fast scans to be carried out that deliver the desired results in minutes. Of course, the results of the simple models should later be checked and modified with the full one.
	Slides THADI1 [4.567 MB]