Library of Congress Cataloging-in-Publication Data Karzmark, C. J. Medical electron accelerators 1 C.J. Karzmark, Craig S. Nunan, and Eiji Tanabe. p. cm. : Medical Electron Accelerators: ** Signed gift inscription by co-author Craig Nunan to the previous owner on front endpaper **; Very. Medical Electron Accelerators by Karzmark, C. J.; Nunan, Craig S.; Tanabe, Eiji and a great selection of related books, art and collectibles available now at.

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However, the spot size ranges from 0.

Whilst the proposed accelerator design is likely to be slightly more robust to operation in perpendicular fields due to the stiffer beam, this has not been tested medicsl this work. Note that current is not a particularly well defined concept when dealing with electron bunches over short time scales, and this acceperators the cause of the variability in the target current peaks.

Further investigation into back-bombardment, its impact on therapeutic beam quality, and mitigation strategies is warranted, but is beyond the scope of this work.

Medical Electron Accelerators

The first is to redesign the optics of the electron gun taking the presence of in-line magnetic fields into account such that the modified gun functions within these fields. The required input power is dependent on the power losses within the accelerator.

However, these results are probably not representative of what would be obtained in real systems for several reasons.


The normalized emittance at the target was calculated using Accelerahors. As the name implies, instead of the steady state fields used to produce an ,edical beam in conventional systems, RF electron guns utilize RF fields Fig.

Medical Electron Accelerators : Clarence J. Karzmark :

As such, the orientation of the accelerator with respect to the MRI scanner becomes important. C was coupled to a previously published model of a 1 T MRI magnet. The E-mail Address es field is required.

Although we have not explicitly modeled the bremsstrahlung phase space resulting from this electron beam, the spatial and energy parameters listed above are comparable with published values. Misalignment between the accelerator and magnetic field increases the radial fields the electrons are subject to, which will cause the electron beam to bend. The electric fields in the central region where the radial coordinate is less than 5 mm were sampled on a 0.

All metrics are acceleratods to the zero field values from Sec. We have investigated the use of a RF electron source based linear accelerator for delivering MRI-Linac radiation therapy. We have assumed perfect alignment of the accelerator with the magnetic field in this work.

The effects of both in-line and perpendicular magnetic fields on linear accelerator operation have previously accelefators studied via computational simulations. Metric Single cell values Single cell values published in Ref. On the other hand, if the dose per pulse remains consistent i. View all subjects More like this Similar Items.

Create lists, bibliographies and reviews: There are a number of potential downsides to the use of RF-gun based electron sources for medical accelerator systems which have not been simulated here, and indeed would be difficult to simulate within the present framework.


The electrn field is required. Please mddical that you are not a robot. Comparison of the electron current from a conventional and RF electron source at the beginning source and end target of the accelerator.

A novel electron accelerator for MRI-Linac radiotherapy

This article has been cited by other articles in PMC. Two utilize the in-line configuration tested in this work, while the third utilizes the perpendicular configuration. Dit takes some time for back-bombardment power to reach a steady state, so the simulation time was extended to ps for these simulations.

Rather than explicitly simulate each individual electron trajectory, electrons are grouped into macro particles. Karzmar ring can be described as a half torus with major radius of 2.

A was replaced with a DC source exported from an Opera electron gun simulation which has been previously described. We have utilized the basic S band cavity design presented by St. The next step was to calculate the RF fields to which the electrons will be subject while in the accelerating structure.

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