نتایج جستجو برای: electron radiation
تعداد نتایج: 533043 فیلتر نتایج به سال:
An overview is presented of radiation protection at high energy electron accelerator facilities. By 'high energy' is meant the energy domain beyond a few tens of MeV, where electromagnetic showers are the determining and dominant factor for beam interactions with matter. The basic components of electron accelerators are described and their potential impact on radiation safety. The paper then co...
Synchrotron radiation is generated by high-energy electron beams accelerated by magnetic bending fields. Coherent synchrotron radiation (CSR) occurs when the emission of multiple electrons in a bunch is in phase, resulting in a quadratic dependence of the power emitted on the number of electrons participating. CSR is possible when the either the entire electron bunch or any longitudinal structu...
[1] We calculate growth rates for extraordinary mode Saturnian kilometric radiation generated by the electron cyclotron maser instability using a ring‐type (DGH) electron phase distribution model fitted to measured electron energy dist r ibut ions in Saturn’s auroral acceleration region. The observed distributions are unstable in spatially isolated regions of transverse linear size of order 10 ...
The LHC is the first proton accelerator for which synchrotron radiation becomes noticeable. At a beam energy of 7 TeV, the relativistic γ factor is comparable to that of electron or positron beams in the B factories or at many light sources. This means that the same number of synchrotron-radiation photons are emitted per proton and turn. The critical photon energy of about 44 eV in the LHC is n...
Accelerator-based light sources such as storage rings and free-electron lasers use relativistic electron beams to produce intense radiation over a wide spectral range for fundamental research in physics, chemistry, materials science, biology, and medicine. More than a dozen such sources operate worldwide, and new sources are being built to deliver radiation that meets with the everincreasing so...
X-ray spectroscopy is used to obtain single-shot information on electron beam emittance in a low-energy-spread 0.5 GeV-class laser-plasma accelerator. Measurements of betatron radiation from 2 to 20 keV used a CCD and single-photon counting techniques. By matching x-ray spectra to betatron radiation models, the electron bunch radius inside the plasma is estimated to be ~0.1 μm. Combining this w...
Introduction: Intraoperative radiotherapy is a radiotherapy technique in which a high single fraction of radiation dose is delivered to the patient after surgery and Concurrent with anesthesia time. The most frequent method for IORT implementation is Intraoperative electron radiotherapy (IOERT), in which, some dedicated and high dose per pulse electron accelerators are employe...
The feasibility of the generation of bright ultrashort gamma-ray pulses is demonstrated in the interaction of a relativistic electron bunch with a counterpropagating tightly focused superstrong laser beam in the radiation-dominated regime. The Compton scattering spectra of gamma radiation are investigated using a semiclassical description for the electron dynamics in the laser field and a quant...
We report first evidence of wakefield acceleration of a relativistic electron beam in a dielectric-lined slab-symmetric structure. The high energy tail of a ∼60 MeV electron beam was accelerated by ∼150 keV in a 2 cm-long, slab-symmetric SiO2 waveguide, with the acceleration or deceleration clearly visible due to the use of a beam with a bifurcated longitudinal distribution that serves to app...
In this paper, we propose a scheme to generate tunable coherent X-ray radiation for future light source applications. This scheme uses an energy chirped electron beam, a laser modulator, a laser chirper and two bunch compressors to generate a prebunched kilo-Ampere current electron beam from a few tens Ampere electron beam out of a linac. The initial modulation energy wavelength can be compress...
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