A5071393353- Advanced Radiotherapy Techniques
- Radiation Therapy and Dosimetry
- Particle Accelerators and Free-Electron Lasers
- Gyrotron and Vacuum Electronics Research
- Advanced X-ray Imaging Techniques
- Particle accelerators and beam dynamics
- Radiation Detection and Scintillator Technologies
- Radiation Dose and Imaging
- Photocathodes and Microchannel Plates
- Advanced X-ray and CT Imaging
- Radiation Effects and Dosimetry
- Medical Imaging Techniques and Applications
- Refrigeration and Air Conditioning Technologies
- Crystallography and Radiation Phenomena
- Turbomachinery Performance and Optimization
- Advancements in Photolithography Techniques
- Cyclone Separators and Fluid Dynamics
- Photonic and Optical Devices
Deutsches Elektronen-Synchrotron DESY
2022-2025
Oak Ridge National Laboratory
2023-2024
Mohammed V University
2018-2024
We report on the operation of first high peak and average power single-pass terahertz free-electron laser (THz FEL) based a high-brightness photoinjector for developing THz source pump-probe experiments at advanced x-ray FELs (XFELs). Electron beams with <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:mn>17</a:mn><a:mtext> </a:mtext><a:mtext> </a:mtext><a:mi>MeV</a:mi><a:mo>/</a:mo><a:mi mathvariant="normal">c</a:mi></a:mrow></a:math> momentum charge up to...
Abstract Development of an accelerator-based tunable THz source prototype for pump-probe experiments at the European XFEL is ongoing Photo Injector Test facility DESY in Zeuthen (PITZ). The proof-of-principle on SASE FEL are performed utilizing LCLS-I undulator (on loan from SLAC) installed PITZ beamline. first lasing a center wavelength 100 μm was observed summer 2022. narrowband achieved using electron beam with energy ∼17 MeV and bunch charge up to several nC. Optimization transport...
The high peak current of the electron beam was found to be key parameter for THz SASE FEL at Photo Injector Test facility DESY in Zeuthen (PITZ). A multipurpose bunch compressor implemented PITZ expand space proof-of-principle studies on tunable high-power accelerator-based source pump-probe experiments European XFEL. magnetic chicane, consisting four rectangular dipole magnets, is designed with a bending angle 19 degrees, due limited original beamline, compress bunches momentum 15–20 MeV/c...
The use of phase space in medical linear accelerator Monte Carlo (MC) simulations significantly improves the execution time and leads to results comparable those obtained from full calculations. classical representation stores directly information millions particles, producing bulky files. This paper presents a virtual source model (VSM) based on reconstruction algorithm, taking as input compressed file roughly 800 kb derived data freely available International Atomic Energy Agency (IAEA)...
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.
Background and purpose.This work aims to present the strategy simulate a clinical linear accelerator based on geometry provided by manufacturer summarize corresponding experimental validation. Simulations were performed with Geant4 Monte Carlo code under grid computing environment. The objective of this contribution is reproducing therapeutic dose distributions in water phantom an accuracy less than 2%.Materials methods.A model Elekta Synergy has been established, simulations launched large...
Abstract The objective of this study is demonstration the principal possibility to increase electron beam dose deposition at certain depth sample for radiation therapy purposes. Electron bunches 22 MeV within train generated PITZ are focused inside using a dedicated fast deflector and solenoid magnet. To explore capabilities proposed setup, distributions calculated multiple in single point water phantom. focusing produces peaks with tunable maximal which interesting healthy tissue sparing...
Advanced experiments using THz pump and X-ray probe pulses at modern free-electron lasers (FELs) like the European FEL require a frequency-tunable, high-power, narrow-band source maintaining repetition rate pulse structure of pulses. This paper reports first results from source, that is based on single-pass high-gain operating with central wavelength 100 micrometers. The prototype currently in operation Photo Injector Test facility DESY Zeuthen (PITZ) uses same type electron as XFEL photo...
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...
In radiology, the photon fluence and energy spectrum generated from an x-ray tube may depend on anode tilt angle. this contribution, a Monte Carlo investigation is performed to quantify effect by modeling based published data Bujila R.et al(2020Physica. Med.7544-54). The GATE simulation code used for purpose. calculations have moreover confirmed dependence; of could be increase fluence. thermal analysis has shown that hot spot size dependent as well focus temperature (ΔT) decreases when...
Abstract Advanced experiments using THz pump and X-ray probe pulses at modern free-electron lasers (FELs) like the European FEL require a frequency-tunable (from 0.1 to 30 THz), high-power (> 10 microjoule), narrow-band (~ 1–2%) source maintaining repetition rate pulse structure of pulses. This paper reports first results from source, that is based on self-amplified spontaneous emission (SASE) operating with central wavelength 100 micrometers. The SASE prototype currently under...
Photoinjectors are the main high brightness electron sources for X-ray free lasers (XFEL). Photoinjector emittance reduction is one of key knobs improving XFEL lasing, so precise measurement critical. It's well known that rms very sensitive to low intensity tails particle distributions in phase space, whose depend on signal noise ratio (SNR) and image processing procedures. Such sensitivities make interpretations beam transverse challenging, leading different definitions reduce impact tail...
Abstract This study aims to optimize the iterative deconvolution correction of air-filled ionization chamber measurements with limited spatial resolution for photon beam dosimetry. The volume effect could be explained by inhomogeneity absorbed dose in its sensitive volume, leading a averaging acting as convolution kernel K(x) . Therefore, “true” profile P t (x) can deduced deconvolving measured 1D profiles m Semiflex 3D type PTW 31021 was studied beams flattening filter (WFF), while SNC125c...