E. Gschwendtner
A5042725008- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Laser-Plasma Interactions and Diagnostics
- Particle Detector Development and Performance
- Particle physics theoretical and experimental studies
- Magnetic confinement fusion research
- Neutrino Physics Research
- Astrophysics and Cosmic Phenomena
- Radiation Detection and Scintillator Technologies
- Superconducting Materials and Applications
- Antenna Design and Analysis
- Dark Matter and Cosmic Phenomena
- Advanced Antenna and Metasurface Technologies
- Atomic and Molecular Physics
- Radiation Therapy and Dosimetry
- Photocathodes and Microchannel Plates
- Nuclear Physics and Applications
- High-Energy Particle Collisions Research
- Electron and X-Ray Spectroscopy Techniques
- Solar and Space Plasma Dynamics
- Medical Imaging Techniques and Applications
- Muon and positron interactions and applications
- Plasma Diagnostics and Applications
- Antenna Design and Optimization
- Laser-induced spectroscopy and plasma
European Organization for Nuclear Research
2014-2024
Campbell Collaboration
2020-2022
Max Planck Institute for Physics
2019
Max Planck Society
2019
Google (United States)
2019
Max Planck Institute for Plasma Physics - Greifswald
2016
University College London
2016
University of Geneva
2004-2012
Daimler (Germany)
2003
Karlsruhe University of Applied Sciences
2000-2003
A bstract The OPERA neutrino experiment at the underground Gran Sasso Laboratory has measured velocity of neutrinos from CERN CNGS beam over a baseline about 730 km. measurement is based on data taken by in years 2009, 2010 and 2011. Dedicated upgrades timing system detector, as well high precision geodesy campaign for baseline, allowed reaching comparable systematic statistical accuracies. An arrival time muon with respect to one computed assuming speed light vacuum $ \left( {6.5\pm...
The OPERA neutrino oscillation experiment has been designed to prove the appearance of ντ in a nearly pure νμbeam (CNGS) produced at CERN and detected underground Hall C Gran Sasso Laboratory, 730 km away from source. In OPERA, τ leptons resulting interaction ντare target units called bricks made nuclear emulsion films interleaved with lead plates. contains 150000 such bricks, for total mass 1.25 kton, arranged into walls plastic scintillator strips. detector is split two identical...
High energy particle accelerators have been crucial in providing a deeper understanding of fundamental particles and the forces that govern their interactions. In order to increase or reduce size accelerator, new acceleration schemes need be developed. Plasma wakefield acceleration, which electrons plasma are excited, leading strong electric fields, is one such promising novel technique. Pioneering experiments shown an intense laser pulse electron bunch traversing plasma, drives fields 10s...
The Advanced Proton Driven Plasma Wakefield Acceleration Experiment (AWAKE) aims at studying plasma wakefield generation and electron acceleration driven by proton bunches. It is a proof-of-principle R&D experiment CERN the world׳s first experiment. AWAKE will be installed in former CNGS facility uses 400 GeV/c beam bunches from SPS. experiments focus on self-modulation instability of long (rms ~12 cm) bunch plasma. These are planned for end 2016. Later, 2017/2018, low energy (~15 MeV)...
New acceleration technology is mandatory for the future elucidation of fundamental particles and their interactions. A promising approach to exploit properties plasmas. Past research has focused on creating large-amplitude plasma waves by injecting an intense laser pulse or electron bunch into plasma. However, maximum energy gain electrons accelerated in a single stage limited driver. Proton bunches are most drivers wakefields accelerate TeV scale stage. An experimental program at CERN—the...
We give direct experimental evidence for the observation of full transverse self-modulation a long, relativistic proton bunch propagating through dense plasma. The exits plasma with periodic density modulation resulting from radial wakefield effects. show that is seeded by ionization front created using an intense laser pulse copropagating bunch. extends over length following seed point. By varying one order magnitude, we frequency scales expected dependence on density, i.e., it equal to...
The seeded self-modulation of a relativistic, charged particle bunch in plasma is shown to grow both along the and plasma, resulting transverse wakefield amplitudes that far exceed initial seed values.
We show in experiments that a long, underdense, relativistic proton bunch propagating plasma undergoes the oblique instability, which we observe as filamentation. determine threshold value for ratio between transverse size and skin depth instability to occur. At threshold, outcome of experiment alternates filamentation self-modulation (evidenced by longitudinal modulation into microbunches). Time-resolved images density distribution reveal grows an observable level late along bunch,...
The international Muon Ionization Cooling Experiment (MICE), which is under construction at the Rutherford Appleton Laboratory (RAL), will demonstrate principle of ionization cooling as a technique for reduction phase-space volume occupied by muon beam. channels are required Neutrino Factory and Collider. MICE evaluate in detail performance single lattice cell Feasibility Study 2 channel. Beam has been constructed ISIS synchrotron RAL, Step I, it characterized using beam-instrumentation...
AWAKE is a proton-driven plasma wakefield acceleration experiment. % We show that the experimental setup briefly described here ready for systematic study of seeded self-modulation 400\,GeV proton bunch in 10\,m-long rubidium with density adjustable from 1 to 10$\times10^{14}$\,cm$^{-3}$. short laser pulse used ionization vapor propagates all way along column, suggesting full vapor. occurs bunch, at time and follows affects bunch.
Plasma wakefield acceleration is a promising technology to reduce the size of particle accelerators. The use high energy protons drive wakefields in plasma has been demonstrated during Run 1 AWAKE programme at CERN. Protons 400 GeV drove that accelerated electrons 2 under 10 m plasma. collaboration now embarking on with main aims demonstrate stable accelerating gradients 0.5–1 GV/m, preserve emittance electron bunches and develop sources scalable 100s metres beyond. By end 2, scheme should...
Experimental results show that hosing of a long particle bunch in plasma can be induced by wakefields driven short, misaligned preceding bunch. Hosing develops the plane misalignment, self-modulation perpendicular plane, at frequencies close to electron frequency, and are reproducible. Development depends on misalignment direction, its growth extent proton charge. Results have main characteristics theoretical model, relevant other plasma-based accelerators represent first characterization...
The European Particle Physics Strategy Update (EPPSU) process takes a bottom-up approach, whereby the community is first invited to submit proposals (also called inputs) for projects that it would like see realised in near-term, mid-term and longer-term future. National inputs as well from Laboratories are also an important element of process. All these then reviewed by Preparatory Group (PPG), whose role organize Symposium around submitted ideas prepare discussion on importance merits...
Physics Beyond Colliders is an exploratory study aimed at exploiting the full scientific potential of CERN's accelerator complex and its infrastructure in next two decades through projects complementary to LHC, HL-LHC other possible future colliders. These should target fundamental physics questions that are similar spirit those addressed by high-energy colliders, but require different types beams experiments. A kick-off workshop held September 2016 identified a number areas interest working...
This paper presents two different ultra-broadband antenna designs for mobile communications and navigation, which can be integrated conformally into the bodywork of a car. Both antennas are based on frequency-independent spiral structure. One antenna, is intended to car's window, an externally fed in order obtain flat The second consists four arms by coplanar waveguide transmission line. enables excitation radiation patterns terrestrial satellite services. With low cost feed network both...
One of the most critical elements for protection CERN's Large Hadron Collider (LHC) is its beam loss monitoring (BLM) system. It must prevent superconducting magnets from quenching and protect machine components damages, as a result losses. By measuring pattern, BLM system helps to identify mechanism. Special monitors will be used setup control collimators. The specification includes very high reliability (tolerable failure rate 10/sup -7/ per hour) dynamic range 8/ (10/sup 13/ at certain...
This document provides detailed information on the status of Advanced and Novel Accelerators techniques describes steps that need to be envisaged for their implementation in future accelerators, particular high energy physics applications. It complements overview prepared update European Strategy particle physics, a description field. The scientific priorities community are described each technique acceleration able achieve accelerating gradient GeV~range or above. ALEGRO working group...
We use a relativistic ionization front to provide various initial transverse wakefield amplitudes for the self-modulation of long proton bunch in plasma. show experimentally that, with sufficient amplitude [$\ensuremath{\ge}(4.1\ifmmode\pm\else\textpm\fi{}0.4)\text{ }\text{ }\mathrm{MV}/\mathrm{m}$], phase modulation along is reproducible from event event, 3%--7% (of $2\ensuremath{\pi}$) rms variations all bunch. The not lower amplitudes. observe transition between these two regimes. Phase...
This report summarises the conclusions from detector group of International Scoping Study a future Neutrino Factory and Super-Beam neutrino facility. The baseline options for each possible beam are defined as follows:
It is shown that co-linear injection of electrons or positrons into the wakefield self-modulating particle beam possible and ensures high energy gain. The witness must co-propagate with tail part driver, since plasma wave phase velocity there can exceed light velocity, which necessary for efficient acceleration. If many periods long, then trapped charge limited by loading effects. initial trapping better positrons, but at acceleration stage a considerable fraction lost from wave. For...