A5052103198- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Advanced X-ray Imaging Techniques
- Magnetic confinement fusion research
- Scientific Computing and Data Management
- Quantum Computing Algorithms and Architecture
- Advanced Electrical Measurement Techniques
- Quantum Information and Cryptography
- Power Line Communications and Noise
- Molecular Communication and Nanonetworks
- Photocathodes and Microchannel Plates
- Superconducting Materials and Applications
- Advanced Chemical Physics Studies
- Lightning and Electromagnetic Phenomena
- Particle Detector Development and Performance
- Network Traffic and Congestion Control
- Magneto-Optical Properties and Applications
- Scientific Research and Philosophical Inquiry
- Mechanical and Optical Resonators
- Physics of Superconductivity and Magnetism
- Quantum-Dot Cellular Automata
- Crystallography and Radiation Phenomena
- Spectroscopy and Laser Applications
- Scheduling and Timetabling Solutions
- Optical Network Technologies
Deutsche Telekom (Germany)
2021-2024
Deutsches Elektronen-Synchrotron DESY
1998-2003
Universität Hamburg
2000
RWTH Aachen University
1998
We present the first observation of self-amplified spontaneous emission (SASE) in a free-electron laser (FEL) vacuum ultraviolet regime at 109 nm wavelength (11 eV). The observed gain (approximately 3000) and radiation characteristics, such as dependency on bunch charge, angular distribution, spectral width, intensity fluctuations, are all consistent with models for SASE FELs.
Measurements of coherent diffraction radiation from a slit variable width generated by short electron bunches were performed in millimeter and submillimeter ranges. Experimental data are compared with the transition case theoretical predictions. A more realistic description than conventional theory is necessary to account for correctly. No noticeable difference estimated bunch length was observed using wide range widths radiation.
First laboratory prototypes of Hilbert-transform spectrometers have been developed. To meet the requirements spectroscopy, high-T/sub c/ Josephson junctions with RSJ-like behavior fabricated on twin-free NdGaO/sub 5/ bicrystal substrates. The operation has demonstrated from 60 GHz up to 2.25 THz. first out-of-lab application successfully at TESLA Test Facility linear accelerator DESY (Hamburg). spectra coherent transition electromagnetic radiation electron bunches measured and a bunch length...
The longitudinal charge distribution of the electron bunches in TESLA Test Facility linac has been determined using coherent transition radiation produced at a thin metal foil. autocorrelation pulse is measured with Martin Puplett interferometer and then Fourier transformed to yield spectrum bunch form factor. Several techniques, including Kramers-Kronig analysis, have applied determine distribution. Measurements thermionic gun RF photoinjector are presented. influence frequency-dependent...
Quantum Key Distribution technology is evaluated for carrier-grade provider networks in the Berlin OpenQKD testbed, which operated by Deutsche Telekom. It includes investigation of modular architectures, standardized interfaces and layered network structures containing quantum, key management, application layers as well hybrid technologies, consisting Post-Quantum Cryptography. The testbed incorporates field-installed wireline fiber links together with wireless radio connections, enabling...
We demonstrate a trusted-node-free design for integration of DV-QKD system into the Berlin OpenQKD optical testbed. By utilizing conventional telecom modulators and standard WDM-AWG, our scheme offers flexible multi-partner communication, full connectivity between non-adjacent nodes over multiple C-band frequencies metropolitan distances.
In the TESLA Test Facility (TTF), short bunches with low emittance are needed for operation of a free electron laser. Several stages bunch compression by means magnetic chicanes will be used to reach required peak current. The second stage system, compressor II, has been taken into recently. We describe design and instrumentation II communicate experiences made during commissioning.
The longitudinal charge distribution of an electron bunch can be determined from the coherent transition radiation emitted when crosses a thin metal foil. A Josephson junction made film YBa/sub 2/Cu/sub 3/O/sub 7-x/ on bicrystal substrate is used as detector for in millimeter and submillimeter range. spectral intensity form factor are derived by applying Hilbert transformation to radiation-induced modification current-voltage characteristic junction. physical principles outlined first length...
The transverse phase space distribution of an electron beam can be determined with a quadrupole scan by measuring the resulting profiles via optical transition radiation and applying tomographic reconstruction method. Phase tomography has been successfully used at TESLA Test Facility (TTF) linac equipped radio frequency photo-injector. Measurements distributions emittances will presented.
This paper analyses a classical and quantum annealing approach to compute the minimum deployment of Quantum Key Distribution (QKD) hardware in tier 1 provider network. The ensemble QKD systems needs be able exchange as many encryption keys between all network nodes order encrypt data payload, which is defined by traffic demand matrices. Redundancy latency requirements add additional boundary conditions. result optimization problem yields heuristic planners may utilize for planning future networks.
Our recent results on Hilbert-transform spectral analysis based ac Josephson effect are reported. High-quality epitaxial YBa<SUB>2</SUB>Cu<SUB>3</SUB>O<SUB>7-x</SUB> thin-film junctions have been fabricated untwinned (110) NdGaO<SUB>3</SUB> bicrystal substrates to satisfy the operational requirements of technique. The design and characteristics developed laboratory spectrometers presented. Spectra radiation in high-T<SUB>c</SUB> measured frequency range from 60 2250 GHz, a Lorentzian shape...
The expansion of Fiber-To-The-Home (FTTH) networks creates high costs due to expensive excavation procedures. Optimizing the planning process and minimizing cost earth work therefore lead large savings. Mathematically, FTTH network problem can be described as a minimum Steiner Tree problem. Even though has already been investigated intensively in last decades, it might further optimized with help new computing paradigms emerging approaches. This studies upcoming technologies, such Quantum...
The subject of Job Scheduling Optimisation (JSO) deals with the scheduling jobs in an organization, so that single working steps are optimally organized regarding postulated targets. In this paper a use case is provided which sub-aspect JSO, Shop Problem (JSSP or JSP). As many optimization problems JSSP NP-complete, means complexity increases every node system exponentially. goal to show how create optimized duty rooster for certain workpieces flexible machinery, combined Autonomous Ground...