نتایج جستجو برای: electron accelerator
تعداد نتایج: 322049 فیلتر نتایج به سال:
An accurate dose calculation in phantom and patient geometries requires an accurate description of the radiation source. Errors in the radiation source description are propagated through the dose calculation. With the emergence of linear accelerators whose dosimetric characteristics are similar to within measurement uncertainty, the same radiation source description can be used as the input to ...
A study of the electron beam dynamics in the linac is conducted for the FERMI free electron laser (FEL) founded for construction at the Sincrotrone Trieste [1]. LAYOUT AND DESIGN PARAMETERS The FERMI accelerator layout is schematically shown in Figure 1. It consists of an injector, four linacs, two bunch compressors, a laser heater, and a spreader used to direct the electron beam into one of tw...
Linear-accelerator-based sources will revolutionize ultrafast x-ray science due to their unprecedented brightness and short pulse duration. However, time-resolved studies at the resolution of the x-ray pulse duration are hampered by the inability to precisely synchronize an external laser to the accelerator. At the Sub-Picosecond Pulse Source at the Stanford Linear-Accelerator Center we solved ...
X-ray free-electron lasers (FELs) are expensive instruments and a large part of the cost of the entire facility is driven by the accelerator. Using a high-energy gain dielectric wake-field accelerator (DWA) instead of the conventional accelerator may provide a significant cost saving and reduction of the facility size. In this article, we investigate using a collinear dielectric wakefield accel...
A major new accelerator with unique capabilities for studies of electromagnetic interactions, neutron physics, and applied reactor technology will be operating at LRL's Livermore Laboratory by mid1969. The AEC recently announced the allocation of $4.1 million to build and house the new 100 MeV "electronpositron" linear accelerator. The machine will be similar in principle to the 25 MeV Linac wh...
When the operation of a multisection linear accelerator is considered, among the first images to come to mind is that of an array of klystrons and accelerator sections, all working in phase synchronism so that the electron bunches which pass through the accelerator are always on the crests of the traveling wave. This desired situation is provided by the combination of the drive system and the p...
After the historical background concerning the pressure of light, we derive the quantum field theory force of the laser radiation acting on electron. Numerically, we determine the velocity of an electron accelerated by laser beam, after acceleration time ∆t = 1s. 1 Why laser acceleration ? The problem of acceleration of charged particles by the laser field is, at present time, one of the most p...
background: the purpose of this study was to evaluate the dependency of magica polymer gel dosimeter response (r2) on different electron energies as well as on different mean dose rate for a standard clinically used linear accelerator. materials and methods: the sensitivity of the dosimeter was represented by the slope of calibration curve in the linear region measured for each modality. a cali...
Percentage depth doses (PDDs) and transverse dose profiles (TDPs) were calculated by a Monte Carlo simulation of electron beams of different energies (3, 5, 7 and 9 MeV) produced by a NOVAC7® accelerator. The NOVAC7® is a linear accelerator designed for Intraoperative Radiation Therapy (IORT). The PDDs and TDPs were also experimentally determined. Both calculations and measurements were done on...
Up to now, different designs have been introduced for measurement beam profile accelerators. Secondary electron emission monitors (SEM) are one of these devices which have been used for this purpose. In this work, a SEM has been constructed to measure beam profile of ES-200 accelerator, a proton electrostatic accelerator which is installed at SBU. Profile grid for both planes designed with 16 w...
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