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Featured researches published by Shaukat Khan.


Synchrotron Radiation News | 2013

Generation of Ultrashort and Coherent Synchrotron Radiation Pulses at DELTA

Shaukat Khan; Fin Bahnsen; S. Cramm; Sven Döring; Justin Grewe; Markus Höner; Holger Huck; Maryam Huck; Robert Molo; Lukasz Plucinski; Andreas Schick; Claus M. Schneider; Peter Ungelenk

Pump-probe experiments to study ultrafast dynamic phenomena such as electron transfer, lattice vibrations, phase transitions, chemical reactions, or spin dynamics require two short radiation pulses as well as good control of the time delay between them. The first pulse to excite (“pump”) the sample under study is usually a femtosecond laser pulse in the near-visible regime. For the second pulse to analyze (“probe”) the state of the sample as a function of the delay, however, light with shorter and tunable wavelength would be desirable. Conventional synchrotron light sources produce pulses with a typical duration of 30–100 ps (FWHM), given by the electron bunch length in a storage ring, which is not well suited for ultrafast studies. The bunch length can be reduced to a few picoseconds in the so-called low-α mode (e.g., [1]) by lowering the momentum compaction factor α of the storage ring. Radiation pulses in the femtosecond range, however, are obtained more easily by extracting synchrotron light from a small fraction of the electron distribution, rather than the whole bunch, which can be achieved with the laser-based methods described below.


Synchrotron Radiation News | 2011

Coherent Harmonic Generation at DELTA: A New Facility for Ultrashort Pulses in the VUV and THz Regime

Shaukat Khan; Mohammed Bakr; Markus Höner; Holger Huck; Robert Molo; Andre Nowaczyk; Andreas Schick; Peter Ungelenk; Maryam Zeinalzadeh

Synchrotron radiation sources producing high-brilliance radiation with tunable wavelength in the VUV to X-ray regime are ideally suited to study the structure of matter on the atomic scale. With a pulse duration of typically 30-100 ps (FWHM), however, they cannot resolve dynamic phenomena such as lattice vibrations, phase transitions, chemical reactions, or fast magnetization changes. Mode-locked lasers, on the other hand, produce intense pulses with a duration below 100 fs, but only at near-visible wavelengths. In the quest for short pulse duration and short wavelength, good progress has been made. High harmonic generation (HHG) or X-rays from a laser-generated plasma have become standard techniques in many laser laboratories. Linac-based free-electron lasers (FELs) have reached the Ångström wavelength regime, a pulse duration of a few femtoseconds, and unprecedented peak brilliance [1]. As for conventional synchrotron light sources, pulses of a few picoseconds can be produced by lowering the momentum compaction factor and thus reducing the bunch length (see e.g. [2]). Even shorter pulses are obtained by combining electron bunches with femtosecond laser pulses.


Archive | 2018

Measurement of the Laser-Induced Energy Modulation Amplitude at the Short-Pulse Facility at DELTA

Arne Meyer auf der Heide; Shaukat Khan; Carsten Mai; Nils Maris Lockmann; Benedikt Büsing; Bernard Riemann; Boris Sawadski

The short-pulse facility at the synchrotron light source DELTA operated by the TU Dortmund University employs coherent harmonic generation (CHG) to provide ultrashort pulses in the vacuum ultraviolet and terahertz regime. Here, a laser-electron interaction results in a modulation of the electron energy which is transformed into a density modulation by a magnetic chicane. Measurements of the energy modulation amplitude with different techniques including an RF phase modulation are presented. A combination of the results allow to estimate the energy spread of the electron beam.


5th Int. Particle Accelerator Conf. (IPAC'14), Dresden, Germany, June 15-20, 2014 | 2014

Investigation of Beam Instabilities at DELTA using Bunch-by-bunch Feedback Systems

Markus Höner; Svenja Hilbrich; Holger Huck; Maryam Huck; Shaukat Khan; Carsten Mai; Arne Meyer auf der Heide; Robert Molo; Helge Rast; Malte Sommer; Peter Ungelenk

At the 1.5-GeV electron storage ring DELTA operated by the TU Dortmund University as a synchrotron radiation user facility, bunch-by-bunch feedback systems are in use for electron beam diagnostics and for the suppression of multibunch instabilities. An automatic readout of bunch position data allows a real-time modal analysis during machine operation. An excitation of particular multibunch modes enables the determination of growth and damping times for all modes independently. Further investigations of beam stability and natural damping times of all modes even below the instability threshold have been performed. In addition, first bunch-by-bunch data taken from the booster synchrotron are shown.


6th International Particle Accelerator Conference | 2015

Recent Results from FEL seeding at FLASH

Joern Boedewadt; Ingmar Hartl; Shaukat Khan; Sven Ackermann; Guangyao Feng; Christoph Lechner; Jost Mueller; Joerg Rossbach; Rosen Ivanov; Velizar Miltchev; Bart Faatz; Philipp Amstutz; Takanori Tanikawa; Nagitha Ekanayake; Markus Drescher; Armin Azima; Kirsten Hacker; Leslie Lamberto Lazzarino; Theophilos Maltezopoulos; Robert Molo; Tim Laarmann; Tim Plath; Ralph Assmann


international free electron laser conference | 2014

Demonstration of SASE Suppression Through a Seeded Microbunching Instability

Christoph Lechner; Shaukat Khan; Sven Ackermann; Torsten Golz; Joerg Rossbach; Velizar Miltchev; Katja Honkavaara; M.V. Yurkov; E.A. Schneidmiller; Joern Boedewadt; Nagitha Ekanayake; Markus Drescher; Guenter Brenner; Armin Azima; Nikola Stojanovic; Kirsten Hacker; Leslie Lamberto Lazzarino; Theophilos Maltezopoulos; Martin Dohlus; Juliane Roensch-Schulenburg; Eugen Hass; Robert Molo; Tim Laarmann; Tim Plath; Torsten Limberg


Physical review accelerators and beams | 2017

Continuously tunable narrowband pulses in the THz gap from laser-modulated electron bunches in a storage ring

Peter Ungelenk; Markus Höner; Holger Huck; Shaukat Khan; Carsten Mai; A. Meyer auf der Heide; C. Evain; Christophe Szwaj; Serge Bielawski


5th International Particle Accelerator Conference (IPAC 2014), Dresden, 15. -20. Juni 2014 | 2014

STUDIES OF ULTRASHORT THz PULSES AT DELTA

Peter Ungelenk; Serge Bielawski; Lukas-Georg Böttger; C. Evain; Svenja Hilbrich; N. Hiller; Holger Huck; Maryam Huck; Markus Höner; Vitali Judin; Shaukat Khan; Marc Le Parquier; Carsten Mai; Arne Meyer auf der Heide; Robert Molo; Juliane Raasch; Helge Rast; Eléonore Roussel; Andreas Schick; Christophe Szwaj; Petra Thoma


Presented at | 2010

Status of sFLASH, the Seeding Experiment at FLASH

Hossein Delsim-Hashemi; Marek Wieland; Shaukat Khan; Velizar Miltchev; Katja Honkavaara; Juliane Rönsch-Schulenburg; Tim Laarmann; Jorg Robach; Holger Schlarb; Francesca Curbis; Joern Bodewadt; Theophilos Maltezopoulos; Roxana Tarkeshian; Atoosa Meseck; Sasa Bajt; Manuel Mittenzwey; Markus Drescher; Rasmus Ischebeck; Armin Azima


8th International Particle Accelerator Conference | 2017

Parameter Optimization for Operation of sFLASH with Echo-Enabled Harmonic Generation

Ralph Aßmann; Shaukat Khan; Tim Plath; Wolfgang Hillert; Christoph Lechner; Nils Maris Lockmann; Jörn Bödewadt; Joerg Rossbach

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Robert Molo

Technical University of Dortmund

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Peter Ungelenk

Technical University of Dortmund

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Markus Höner

Technical University of Dortmund

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Holger Huck

Technical University of Dortmund

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Tim Plath

University of Hamburg

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Andreas Schick

Technical University of Dortmund

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