O. Ayhan Erdem

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Tunnel ionizing neutral gas with the self-field of a charged particle beam is explored as a possible way of creating plasma sources for a plasma wakefield accelerator [Bruhwiler et al., Phys. Plasmas (to be published)]. The optimal gas density for maximizing the plasma wakefield without preionized plasma is studied using the PIC simulation code OSIRIS [R.(More)
When considering intense particle or laser beams propagating in dense plasma or gas, ionization plays an important role. Impact ionization and tunnel ionization may create new plasma electrons, altering the physics of wakefield accelerators, creating and modifying instabilities, etc. Here we describe the addition of an ionization package into the 3-D(More)
BACKGROUND The hemodynamic changes in hepatic vascular structures of hepatosteatosis patients were examined using Doppler ultrasonography. MATERIAL/METHODS Ninety hepatosteatosis patients, classified as mild, moderate or severe, and 30 healthy volunteers were included in this 120-person study. The height, weight, liver size, blood lipids and blood liver(More)
PURPOSE The aim of this study was to assess the detectability of the structures that are affected by cervical spondylosis by different 3D MRI sequences and compare the image quality of those sequences. MATERIALS AND METHODS Twenty healthy volunteers were examined using a 1.5 T MR unit. T2* weighted 3D-gradient echo sequence with magnetization transfer(More)
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