نتایج جستجو برای: proton beams
تعداد نتایج: 97152 فیلتر نتایج به سال:
Since their discovery in 1999 [1] the topic of laseraccelerated ions has attracted high attention both in the field of plasma-physics and in the accelerator community. In a typical laser-accelerated ion scheme a thin metal foil is irradiated by an ultra-intense chirped pulse amplified laser beam which leads to the generation of relativistic electrons. These electrons are accelerated through the...
PURPOSE We investigated the feasibility of proton tomosynthesis as daily positioning of patients and compared the results with photon tomosynthesis as an alternative to conventional portal imaging or on-board cone-beam computed tomography. METHODS Dedicated photon-like proton beam using the passively scattered proton beams by the cyclotron was generated for proton imaging. The eleven projecti...
a proton induced x-ray emission (pixe) analysis of concentration of trace elements in varicose veins
background: proton induced x-ray emission (pixe) has been applied as reliable and improved techniques in this study to compare concentration of various trace elements in normal and abnormal varicose veins. materials and methods: five samples from normal veins and 13 samples from varicose veins bombarded by 2.0 mev energy proton beams produced by a van de graff accelerator in vacuum. two specime...
Proton beam therapy (PBT) is a state-of-the-art radiotherapy treatment approach that uses focused proton beams for tumor ablation. A key advantage of this approach over conventional photon radiotherapy (XRT) is the unique dose deposition characteristic of protons, which results in superior healthy tissue sparing. This results in fewer unwanted side effects and improved outcomes for patients. Cu...
The emission characteristics of intense laser driven protons are controlled using ultrastrong (of the order of 10(9) V/m) electrostatic fields varying on a few ps time scale. The field structures are achieved by exploiting the high potential of the target (reaching multi-MV during the laser interaction). Suitably shaped targets result in a reduction in the proton beam divergence, and hence an i...
PURPOSE To investigate the variations in induction and repair of DNA damage along the proton path, after a previous report on the increasing biological effectiveness along clinically modulated 60-MeV proton beams. METHODS AND MATERIALS Human skin fibroblast (AG01522) cells were irradiated along a monoenergetic and a modulated spread-out Bragg peak (SOBP) proton beam used for treating ocular m...
The experimental program to be carried out with the two-mile-long 20-GeV electron beam produced at the Stanford Linear Accelerator Center (SLAC) and the associated experimental apparatus have been designed to take full advantage of the unique features of this accelerator. These have been described in detail in the previous article and so only the main qualitative features are listed here: 1. Hi...
We show how the charge symmetry of strong interactions can be used to relate the proton and neutron asymptotic normalization coefficients (ANCs) of the one-nucleon overlap integrals for light mirror nuclei. This relation extends to the case of real proton decay where the mirror analog is a virtual neutron decay of a loosely bound state. In this case, a link is obtained between the proton width ...
The beam transverse emittance control and preservation in all the acceleration chain from the proton source to the 7TeV colliding beams is fundamental for ensuring high luminosity runs at the CERN Large Hadron Collider (LHC). This paper aims at discussing the emittance measurement methods and present status in the acceleration stages from the Proton Synchrotron Booster (PSB) injection at p=50Me...
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