A5087408515- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Laser-Plasma Interactions and Diagnostics
- Gyrotron and Vacuum Electronics Research
- Magnetic confinement fusion research
- Advanced X-ray Imaging Techniques
- Photocathodes and Microchannel Plates
- Pulsed Power Technology Applications
- Electron and X-Ray Spectroscopy Techniques
- Superconducting Materials and Applications
- Particle Detector Development and Performance
- Plasma Diagnostics and Applications
- Atomic and Molecular Physics
- Laser-induced spectroscopy and plasma
- Laser Design and Applications
- Ionosphere and magnetosphere dynamics
- Electromagnetic Compatibility and Measurements
- Nuclear Physics and Applications
- Integrated Circuits and Semiconductor Failure Analysis
- Electronic Packaging and Soldering Technologies
- Molten salt chemistry and electrochemical processes
- Soybean genetics and cultivation
- Radiation Effects and Dosimetry
- Radiation Therapy and Dosimetry
- Advancements in Photolithography Techniques
Deutsches Elektronen-Synchrotron DESY
2016-2022
Joint Institute for Nuclear Research
2014
Particle-beam-driven plasma wakefield acceleration (PWFA) enables various novel high-gradient techniques for powering future compact light-source and high-energy physics applications. Here, a driving particle bunch excites response in medium, which may rapidly accelerate trailing witness beam. In this Letter, we present the measurement of ratios to deceleration driver bunch, so-called transformer ratio, significantly exceeding fundamental theoretical thus far experimental limit 2 PWFA. An...
Temporally modulated electron beams have a wide array of applications ranging from the generation coherently enhanced electromagnetic radiation to resonant excitation wakefields in advanced-accelerator concepts. Likewise producing low-energy ultrashort microbunches could be useful for ultrafast diffraction and new accelerator-based light-source In this Letter we propose experimentally demonstrate passive microbunching technique capable forming picosecond bunch train at...
Electron photoinjectors provide high-brightness electron beams to numerous research applications in physics, chemistry, material, and life sciences. Semiconductor photocathodes are widely used here, as they enable the production of low-emittance with variable charge at high repetition rates. One key figures merit is minimum achievable bunch length. In semiconductor cathodes, this dominated by scattering effects varying penetration depths extracting photons, which leads a characteristic...
Beam driven plasma acceleration is one of the most promising candidates for future compact particle accelerator technologies. In this scheme a bunch drives wake in medium. The fields inside can be used to accelerate trailing witness bunch. To maximise ratio between deceleration drive bunch, so called transformer ratio, several methods have been proposed. ones yielding favorable results are based on shaped bunches that long terms wavelength. We present here create such employing temporally...
Self-modulation of an electron beam in a plasma has been observed. The propagation long (several wavelengths) bunch overdense resulted the production multiple bunches via self-modulation instability. Using combination radio-frequency deflector and dipole spectrometer, time energy structure self-modulated was measured. longitudinal phase space measurement showed modulation into three with approximately $200\text{ }\text{ }\mathrm{keV}/c$ amplitude momentum modulation. Demonstrating this...
Slice energy spread is one of the key parameters in free electron laser optimizations, but its accurate measurement not straightforward. Two recent studies from high ($>$100 MeV) photoinjectors at SwissFEL and European XFEL have reported much higher slice than expected their working points (200 - 250 pC). In this paper, a new method for measuring lower beam ($\sim$20 proposed demonstrated PhotoInjector Test facility DESY Zeuthen (PITZ), results pC 500 are those measured injectors.
In state of the art photoinjector electron sources, thermal emittance from photoemission dominates final injector emittance. Therefore, low cathode developments and diagnostics are very important. Conventional measurements for high gradient gun time-consuming thus is not measured as frequently quantum efficiency during lifetime photocathodes, although both important properties optimizations. this paper, a single shot measurement transverse momentum, i.e., per rms laser spot size, proposed...
In the field of beam driven acceleration particles in plasma wakefields (PWFA), source medium is a crucial part accelerator setup. Gas discharges have proven to be reliable and simple type past experiments. Nevertheless, especially cells that aim for peak density range 1015 cm−3, physical apertures around 10 mm, lengths up several meters, stability discharge ignition pulse current waveform limiting applicability. We show successful mitigation these jitters 0.1 m argon gas cell, operating at...
We present a new method to determine the electron density of plasma by measuring periodicity modulations introduced longitudinal phase space relativistic particle bunch interaction with via self-modulation instability. As modulation is solely depending on and beam parameters, this allows time-resolved at position passage, which confirmed in particle-in-cell simulations. Densities range 3.6 × 1012 cm−3 – 7.2 1015 have been measured measurement accuracy comparison spectroscopic measurements.
There is a high demand for intense THz sources since “many excitation mechanisms of matter resonate in the terahertz regime” especially condensed matters. “Accelerator-based provide wide tunability together with intensity and repetition rates beyond 100 kHz, that will enable broad application at European XFEL to most interesting scientific problems field” [1]. Supported by proof principle study started Photo-Injector Test Facility located DESY Zeuthen site (PITZ). Since PITZ electron are...
Various applications in modern particle accelerators or experiments involving high energy beams require a gas atmosphere involve the production of big amounts residual gas. Among these are, e.g., cells for plasma acceleration, jet targets, lenses. As beam quality and stable operation RF-accelerator cavities demand ultra-high vacuum (UHV) conditions, separation between pressure UHV beamline sections is needed. Commonly, this realized by differential pumping thin windows, main advantages...
Fortheoperationoffreeelectronlasers(FELs)liketheEu- ropean XFEL and FLASH located at DESY, Hamburg Site, high quality electron beams are required already from the source. The Photo Injector Test facility Zeuthen Site (PITZ), was established to develop, characterize optimize sources for such FELs. Last year work PITZ focused on optimization of a photo injector op- erated very close startup parameters European XFEL. This implies photocathode laser pulses with Gaus- sian temporal profile about...
Пространственно-временное профилирование лазерных импульсов для фотокатодов линейных ускорителей электронов, Миронов С.Ю., Андрианов А.В., Гачева Е.И., Зеленогорский В.В., Потемкин А.К., Хазанов Е.А., Бонпорнпрасерт П., Грос М., Гуд Дж.Д., Исаев И., Калантарян Д., Козак Т., Красильников Кьян Х., Ли К., Лишилин О., Мелкумян Оппельт А., Ренье Рублак Фельбер Хук Чен Й., Штефан Ф.
Photoinjectors are the main high brightness electron sources for x-ray free lasers (XFELs). Photoinjector emittance reduction is one of key knobs improving XFEL lasing, so precise measurement critical. It well known that rms very sensitive to low intensity tails particle distributions in phase space, whose depends on signal noise ratio and image processing procedures. Such sensitivities make interpretations beam transverse challenging, leading different definitions reduce impact tail...