A5061515161- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Particle physics theoretical and experimental studies
- Particle Detector Development and Performance
- Magnetic confinement fusion research
- Gyrotron and Vacuum Electronics Research
- Quantum chaos and dynamical systems
- Distributed and Parallel Computing Systems
- Astro and Planetary Science
- Scientific Research and Discoveries
- Nuclear Physics and Applications
- Spacecraft Design and Technology
- Radiation Effects in Electronics
- High-Energy Particle Collisions Research
- Gamma-ray bursts and supernovae
- Climate variability and models
- Solar and Space Plasma Dynamics
- Laser-Plasma Interactions and Diagnostics
- Astronomical Observations and Instrumentation
- Pulsars and Gravitational Waves Research
- Embedded Systems Design Techniques
- Geophysics and Gravity Measurements
- Nuclear reactor physics and engineering
- Computational Physics and Python Applications
European Organization for Nuclear Research
2012-2024
University College London
2024
Northern Illinois University
2024
Fermi National Accelerator Laboratory
2024
GSI Helmholtz Centre for Heavy Ion Research
2023
Goethe University Frankfurt
2023
Massachusetts Institute of Technology
2013-2018
American Institute of Aeronautics and Astronautics
2018
University of Stuttgart
2016
Cockcroft Institute
2014
On 2016 Feb 19, nine Rosetta instruments serendipitously observed an outburst of gas and dust from the nucleus comet 67P/Churyumov-Gerasimenko. Among these were cameras spectrometers ranging UV over visible to microwave wavelengths, in situ gas, plasma instruments, one collector. At 09:40 a cloud developed at edge image shadowed region nucleus. Over next two hours recorded signature that significantly exceeded background. The enhancement ranged 50 per cent neutral density factors >100...
Simulations of collimation and beam cleaning were so far often performed with simplified computer models. However, the increase in available CPU power has opened possibility for more realistic simulations. For large accelerators like LHC it is now possible to track millions particles, element by over hundreds turns. The well established SixTrack code treats full six-dimensional phase space considers non-linear magnet components up very high order. This being used all tracking simulations...
Optics stability during all phases of operation is crucial for the LHC. Tools and procedures have been developed rapid checks beta beating, dispersion, linear coupling, as well prompt optics corrections. Important errors different beam commissioning were observed locally corrected using segment-by-segment technique. The most relevant corrections at injection corroborated with dedicated magnetic measurements.
At version V1.ll MAD-X is now advanced enough to he presented as CERN's official replacement for MAD8. has the most useful features of MAD8 hut those that were flawed and difficult improve have been removed. On other hand, so much hetter organized into independent modules which are nicely interfaced with 'c'core external can ea sily be added maintained. The proper integration very versatile map based tool PTC imminent. A release 32-bit Windows platform in preparation. For fall 2003 a review...
In this paper we report total dose test results of COTS components commonly used on CubeSats. We investigate a variety analog integrated circuits, popular microcontrollers (PIC24), SD memory cards and TCXO.
ABSTRACT JWST/NIRCam obtained high angular resolution (0.05–0.1 arcsec), deep near-infrared 1–5 $\mu$m imaging of Supernova (SN) 1987A taken 35 yr after the explosion. In NIRCam images, we identify: (1) faint H2 crescents, which are emissions located between ejecta and equatorial ring, (2) a bar, is substructure ejecta, (3) bright 3–5 continuum emission exterior to ring. The remnant in 1–2.3 images mostly due line emission, emitted hotspots within contrast, dominated by emission. dust,...
Electron beams with the lowest, normalized transverse emittance recorded so far were produced and confirmed in single-bunch-mode operation of Accelerator Test Facility at KEK. We established a tuning method damping ring which achieves small vertical dispersion x-y orbit coupling. The was less than 1% horizontal emittance. At zero-intensity limit, 2.8 x 10(-8) rad m beam energy 1.3 GeV. high intensity, strong effects intrabeam scattering observed, had been expected view extremely particle...
The nonlinear dynamics of a circular accelerator such as the Large Hadron Collider (LHC) may significantly impact its performance. As LHC progresses to more challenging regimes operation it is be expected that single particle in transverse planes will play an increasing role limiting reach accelerator. vital sources are well understood. fields probed through measurement amplitude detuning: variation tune with emittance. This quantity assessed experimentally by exciting beam large amplitudes...
The correct implementation of the nonlinear lattice model is crucial to achieving design performance in storage rings. We describe here a method for simultaneous correction multiple resonances based on local resonance measurements and numerical fits sextupole components. This has been applied two excited Diamond ring. these achieved with unprecedented precision. also point out that this potential lead an effective reconstruction component errors around whole ring circumference.
The effect of space charge on bunched beams has been the subject numerous numerical and experimental studies in first decade 2000. Experimental campaigns performed at CERN Proton Synchrotron 2002 GSI SIS18 2008 confirmed existence an underlying mechanism beam dynamics periodic resonance crossing induced by synchrotron motion charge. In this article we present extension previous to describe a controlled coupled (2D) third order resonance. simulation results latest campaign shed new light...
The dynamic aperture experiment at the CERN Super Proton Synchrotron (SPS) was aimed finding relevant effects that limit single-particle stability in hadron storage rings. These were studied SPS and compared with long-term particle tracking to determine what extent computer simulations can predict under well-known conditions. Such investigations are very important for future colliders such as Large Hadron Collider design of these machines relies heavily on simulations. Besides this practical...
Driving Term experiments have been performed both at small [PS (Proton Synchrotron) Booster] and large accelerators [SPS (Super Proton Synchrotron)] CERN. The theory of how to measure driving terms is reviewed. A wealth SPS shown together with a successful comparison model calculations. PS Booster studies aimed optimizing the machine performance by measuring correcting selected terms.
Abstract The motion of systems with linear restoring forces and recurring nonlinear perturbations is central importance in physics. When a system’s natural oscillation frequencies the frequency satisfy certain algebraic relations, dynamics become resonant. In accelerator physics, an understanding resonances crucial for avoiding loss beam particles. Here we confirm theoretical prediction single two-dimensional coupled resonance by observing so-called fixed lines. Specifically, use CERN Super...
Abstract We present JWST NIRCam (F356W and F444W filters) MIRI (F770W) images NIRSpec Integral Field Unit (IFU) spectroscopy of the young Galactic supernova remnant Cassiopeia A (Cas A) to probe physical conditions for molecular CO formation destruction in ejecta. obtained data as part a survey Cas A. The map spatial distributions synchrotron radiation, Ar-rich ejecta, on both large small scales, revealing remarkably complex structures. emission is stronger at outer layers than Ar which...
Nonlinear beam dynamics plays a crucial role in defining the performance of storage ring. The lifetime, injection efficiency, and dynamic momentum apertures available to are optimized during design phase by proper optimization linear lattice distribution sextupole families. correct implementation model, especially nonlinear part, is nontrivial accelerator physics task. Several parameters can be used compare real machine with model eventually accelerator. Most these extracted from analysis...
Recent measurements of resonance terms suggested the extension existing technique to measure magnet strengths from turn-by-turn beam position monitor data. This article describes algorithm infer strength variation along ring and reports on first measurement. Both software written for analysis data can be particularly useful in commissioning period an accelerator order find magnets with wrong or polarities as well large magnetic errors.
The origin of nonlinear dynamics traces back to the study planets with seminal work Poincaré at end nineteenth century: Les Méthodes Nouvelles de la Mécanique Céleste, Vols. 1-3 (Gauthier Villars, Paris, 1899). In his he introduced a methodology fruitful for investigating dynamical properties complex systems, which led so-called "Poincaré surface section," allows one capture global system, characterized by fixed points and separatrices respect regular chaotic motion. For two-dimensional...