MFL

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2018-09-12
11:54
OpenAccess [PUBDB-2018-03460] Journal Article
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Precision Feedback Control of a Normal Conducting Standing Wave Resonator Cavity
In this paper, the system identification and feedback controller design for a normal conducting Standing wave radio frequency cavity operated in pulsed mode of a free electron laser is presented. The system identification, essential to achieve high performance control, is based on a grey box model, with a priori knowledge about the physical behavior. [...]
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ddc:530
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2018-08-31
14:57
[PUBDB-2018-03325] Report
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Transverse Phase Space Studies in TTF Photoinjector During Run 00-01. A Comparison between Simulation and Experiment.
[ TESLA FEL 2000-04 ]
21 pp. ()
Experimental data on transverse emittance and beam density measurements for avariety of injector settings (photocathode drive-laser phase w.r.t. to peak electric fieldin the RF-gun cavity, magnetic elds settings of solenoids ) are compared along withnumerical simulations performed using the particle tracking code Astra..
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2018-08-17
06:32
OpenAccess [PUBDB-2018-02985] Contribution to a conference proceedings/Contribution to a book
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Cs$_2$Te Photocathode Lifetime at FLASH and European XFEL
9th International Particle Accelerator Conference, IPAC’18, VancouverVancouver, Canada, 29 Apr 2018 - 4 May 20182018-04-292018-05-04 2496-2498 () [doi:10.18429/JACoW-IPAC2018-WEPMF056]  GO
The photoinjectors of FLASH and the European XFEL at DESY (Hamburg, Germany) use Cs$_2$Te photocathodes. In this contribution we give an update on the lifetime and quantum efficiency of the cathodes operated in both facilities. [...]
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2018-08-13
10:05
OpenAccess [PUBDB-2018-02900] Contribution to a conference proceedings
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Temporal X-ray Reconstruction Using Temporal and Spectral Measurements
9th International Particle Accelerator Conference, IPAC’18, Vancouver, BCVancouver, BC, Canada, 29 Apr 2018 - 4 May 20182018-04-292018-05-04 1440-1443 () [10.3204/PUBDB-2018-02900]  GO
Transverse deflecting structures (TDS) are widely used inaccelerator physics to measure the longitudinal density ofparticle bunches. When used in combination with a dispersivesection, the whole longitudinal phase space density canbe imaged. [...]
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2018-07-26
19:20
OpenAccess [PUBDB-2018-02704] Book/Report/Master Thesis
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Vlasov Simulation of Exotic Phase-Space Densities via Tree-Based Domain-Decomposition
[DESY-THESIS-2018-022]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 77 pp. () [10.3204/PUBDB-2018-02704] = Masterarbeit, Universität Hamburg, 2018  GO
Magnetic bunch compression is used to produce the high-brightness electron bunches needed for the operation of a free-electron laser. A longitudinal energy chirp -- imprinted on the bunch via off-crest acceleration -- results in the compression of the bunch in a subsequent dispersive section of the accelerator in form of a magnetic chicane.Such a setup sets the stage for the self-interaction of charge-density in homogeneities via the space-charge fields they generate within the bunch.This can potentially lead to an enhancement of initially present charge-densitymodulations; an effect known as microbunching amplification.Numerical simulation of this dynamics is encumbered by the fact that phase-space densities of electron bunches encountered at free-electron lasers typically exhibit an ``exotic'' structure, as they form a thin, hair-like bandmeandering through phase-space.In this thesis, a Vlasov-simulation approach based on tree domain-decomposition is presented, that allows for the efficient simulation of these phase-space densities despite their exoticness.Further, a beam-dynamics model is presented, which most notably enables the time-discrete treatment of collective space-charge effects in drift regions of the accelerator.Based on this model an arbitrary-order perturbation theory for the microbunching gain in a bunch-compressor is conceived and applied to the case of a long bunch with monochromatic density modulation.Finally, the results from theory and simulation are compared as part of thebenchmarking of the simulation code..
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2018-07-11
17:56
OpenAccess [PUBDB-2018-02583] Conference Presentation
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PolariX TDS - Applications at DESY
High Gradient Workshop 2018, HG2018, SINAPShanghai, SINAP, China, 4 Jun 2018 - 8 Jun 20182018-06-042018-06-08  GO
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2018-05-29
11:22
OpenAccess [PUBDB-2018-02128] Poster
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Cs$_2$Te Photocathode Lifetime at FLASH and European XFEL
The 9th International Particle Accelerator Conference, IPAC'18, VancouverVancouver, Canada, 29 Apr 2018 - 4 May 20182018-04-292018-05-04  GO
The photoinjectors of FLASH and the European XFEL at DESY (Hamburg, Germany) use Cs$_2$ Te photocathodes. In this contribution we give an update on the lifetime and quantum efficiency of the cathodes operated in both facilities [...]
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2018-05-09
14:08
OpenAccess [PUBDB-2018-01937] Book/Report/Dissertation / PhD Thesis
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Generation of ultra-short low-charge electron bunches for single-spike SASE radiation at the Free-Electron Laser in Hamburg
[DESY-THESIS-2018-015]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 144 pp. () [10.3204/PUBDB-2018-01937] = Dissertation, Universität Hamburg, 2017  GO
High-gain Free-Electron Lasers (FEL) constitute a powerful source of intense, short radiation pulses in the XUV and X-ray range that are used in a wide variety of research fields. They typically work in the Self-Amplified Spontaneous Emission (SASE) Mode. [...]
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2018-03-29
13:22
[PUBDB-2018-01601] Contribution to a conference proceedings/Contribution to a book
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Operation of a seeded XUV free electron laser at DESY with high-gain harmonic generation seeding
Conference on Lasers and Electro-Optics : [Proceedings] - OSA Washington, D.C., 2017. - ISBN 978-1-943580-27-9 - doi:10.1364/CLEO_AT.2017.JTu4L.5
CLEO: Applications and Technology, CLEO 2017, San JoseSan Jose, California, 14 May 2017 - 19 May 20172017-05-142017-05-19
Washington, DC : OSA, OSA technical digest (online) JTu4L.5 () [10.1364/CLEO_AT.2017.JTu4L.5]  GO
The XUV free electron laser FLASH has been recently operated in the high-gain harmonic generation (HGHG) mode. We characterized the laser-induced energy modulation, as well as the temporal profile of the seeded FEL pulses. [...]

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2017-12-22
14:09
OpenAccess [PUBDB-2017-14061] Contribution to a conference proceedings
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A Time-Discrete Vlasov Approach to LSC Driven Microbunching in FEL-like Beam Lines
International ICFA Mini-Workshop on Nonlinear Dynamics and Collective Effects in Particle Beam Physics, NOCE2017, ArcidossoArcidosso, Italy, 19 Sep 2017 - 22 Sep 20172017-09-192017-09-22 10 pp. () [10.3204/PUBDB-2017-14061]  GO
Multi-stage bunch compression setups which are commonplace in Free-Electron Laser (FEL) beam lines have shown to be the source of a collective beam instability, the so-called microbunching instability. Collective forces can, in conjunction with the dispersive effect of the magnetic chicane present in such a compressor stage, lead to an amplification of inhomogeneities in the longitudinal charge density of an electron bunch. [...]
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