Michał Krupa
A5073474188- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Laser-Plasma Interactions and Diagnostics
- Particle Detector Development and Performance
- Magnetic confinement fusion research
- Superconducting Materials and Applications
- Particle physics theoretical and experimental studies
- Gyrotron and Vacuum Electronics Research
- Radiation Detection and Scintillator Technologies
- Atomic and Molecular Physics
- Pulsed Power Technology Applications
- Non-Destructive Testing Techniques
- Medical Imaging Techniques and Applications
- Plasma Diagnostics and Applications
- Archaeological Research and Protection
- Sensor Technology and Measurement Systems
- Photorefractive and Nonlinear Optics
- Neutrino Physics Research
- Atomic and Subatomic Physics Research
- Solar and Space Plasma Dynamics
- Advanced Fiber Optic Sensors
- Photonic and Optical Devices
- Magneto-Optical Properties and Applications
- Radiation Therapy and Dosimetry
- Optical measurement and interference techniques
European Organization for Nuclear Research
2013-2024
Campbell Collaboration
2020
Cracow University of Technology
2019
Google (United States)
2019
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,...
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...
A long, narrow, relativistic charged particle bunch propagating in plasma is subject to the self-modulation (SM) instability. We show that SM of a proton can be seeded by wakefields driven preceding electron bunch. timing reproducibility and control are at level small fraction modulation period. With this seeding method, we independently amplitude seed with charge growth rate Seeding leads larger than instability case.
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...
The CERN Linear Electron Accelerator for Research (CLEAR) has now finished its second year of operation, providing a testbed new accelerator technologies and versatile radiation source. Hosting varied experimental program, this beamline provides flexible test facility users both internal external to CERN, as well being an excellent physics training ground. energy can be between 60 220 MeV, bunch length 1 4 ps, charge in the range 10 pC 2 nC, number bunches 200, at repetition rate 0.8 Hz....
We exploit the coherent emission of Cherenkov diffraction radiation (ChDR) by a relativistic electron beam to sense its position even in presence other particle beams. ChDR is produced alumina inserts embedded vacuum chamber walls and recorded narrow band centered at 30 GHz. This nontrivial solution has been implemented for plasma wakefield accelerators, where be sensed can copropagate with another high-energy proton that generates wakefield. In addition, variance most existing detectors,...
We study experimentally the longitudinal and transverse wakefields driven by a highly relativistic proton bunch during self-modulation in plasma. show that wakefields' growth amplitude increase with increasing seed as well charge using maximum radius of distribution measured on screen downstream from externally injecting electrons measuring their final energy. Measurements agree trends predicted theory numerical simulations validate our understanding development self-modulation. Experiments...
Abstract In 2017, AWAKE demonstrated the seeded self-modulation (SSM) of a 400 GeV proton beam from Super Proton Synchrotron at CERN. The angular distribution protons deflected due to SSM is quantitative measure process, which agrees with simulations by two-dimensional (axisymmetric) particle-in-cell code LCODE about 5%. agreement achieved in population scans two selected plasma densities and scan longitudinal density gradient. reached only case wide enough simulation box (several...
In this article, we briefly summarize the experiments performed during first Run of Advanced Wakefield Experiment, AWAKE, at CERN (European Organization for Nuclear Research). The final goal AWAKE 1 (2013 - 2018) was to demonstrate that \unit[10-20]{MeV} electrons can be accelerated GeV-energies in a plasma wakefield driven by highly-relativistic self-modulated proton bunch. We describe experiment, outline measurement concept and present results. Last, our plans future.
We study experimentally the effect of linear plasma density gradients on self-modulation a 400\,GeV proton bunch. Results show that positive/negative gradient in/decreases number micro-bunches and relative charge per micro-bunch observed after 10\,m plasma. The measured modulation frequency also in/decreases. With largest positive we observe two frequencies in power spectrum. are consistent with changes wakefields' phase velocity due to adding slow during growth predicted by theory.
Self-modulation is a beam–plasma instability that useful to drive large-amplitude wakefields with bunches much longer than the plasma skin depth. We present experimental results showing that, when increasing ratio between initial transverse size of bunch and depth, occurs later along bunch, or not at all, over fixed length because amplitude decreases. show cases for which self-modulation does develop, we introduce simple model discussing conditions it would occur after any length. Changing...
The vertical plane transverse emittance of accelerated electron bunches at the AWAKE experiment CERN has been determined, using three different methods data analysis. This is a proof-of-principle measurement existing spectrometer to validate technique. Large values geometric emittance, compared that injection beam, are observed ($\sim \SI{0.5}{\milli\metre\milli\radian}$ with $\sim \SI{0.08}{\milli\metre\milli\radian}$), which in line expectations growth arising from plasma density ramps and...
Plasma wakefield dynamics over timescales up to 800 ps, approximately 100 plasma periods, are studied experimentally at the Advanced Wakefield Experiment (AWAKE). The development of longitudinal amplitude driven by a self-modulated proton bunch is measured using external injection witness electrons that sample fields. In simulation, resonant excitation causes electron trajectory crossing, resulting in potential outside boundary as transversely ejected. Trends consistent with presence this...
We present numerical simulations and experimental results of the self-modulation a long proton bunch in plasma with linear density gradients along beam path. Simulation agree reported [F. Braunmller, T. Nechaeva et al. (AWAKE Collaboration), Phys. Rev. Lett. 125, 264801 (2020)]: negative gradients, charge modulated is lower than positive gradients. In addition, modulation frequency varies gradient. show that dephasing wakefields respect to relativistic protons main cause for loss charge. The...
Nanosecond pulses of large amplitudes are required for laboratory measurements in several domains, including particle accelerator beam instrumentation. Producing such can be efficiently achieved with so called avalanche generators. In these generators an external delay line, charged to relatively high voltage, is periodically discharged the generator output exploiting breakdown effect a bipolar junction transistor. This paper describes number built and used by authors, versions trigger...
Czasopismo Techniczne » 2019 Volume 9 Lipnica Murowana – historic heritage and its conservation protection A
In 2017, AWAKE demonstrated the seeded self-modulation (SSM) of a 400 GeV proton beam from Super Proton Synchrotron (SPS) at CERN. The angular distribution protons deflected due to SSM is quantitative measure process, which agrees with simulations by two-dimensional (axisymmetric) particle-in-cell code LCODE. Agreement achieved for populations between $10^{11}$ and $3 \times 10^{11}$ particles, various plasma density gradients ($-20 \div 20\%$) two densities ($2\times 10^{14} \text{cm}^{-3}$...
Precise measurements of electrostatic fields in harsh environments are required ranging from particle accelerators to industrial installations. Many techniques disrupt the field distribution due presence conductors. We present a fully dielectric sensor for very environmental conditions, that exploits Pockels effect manifested by electro-optic crystals. This system is designed allow DC be performed frequency domain. The paper discusses an analytical model and simulations system, validated...