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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The mean current, spatial, and energy distributions were evaluated to assess suitability of the beam for radiotherapy treatments. Higher fields further limit the impact of space charge. RF guns are widely used in other particle accelerator fields, for instance, as injectors to synchrotron beams.

Finding libraries that hold this item Further optimization of this structure would be needed for a physical system, but this simple implementation was sufficient for the present work. Note the way that low energy electrons are deflected when they pass through the nose cones at the wrong phase. For comparison, previously published values for the same accelerating cavity are also included.

Books by Clarence J. J. Karzmark

Perhaps the most substantial barrier to clinical implementation of a system such as that described here is the increased back-bombardment power deposited by back accelerated electrons. We have assumed perfect alignment of the accelerator with the magnetic field in this work. The simulation was repeated for cathode to isocenter distances from 1 to 2.

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Karzmmark current extracted from a thermionic cathode versus potential difference. Kedical enter your name. In order to calculate the particle trajectories, the RF fields from Sec. Don’t have an account? English View all editions and formats Rating: Please enter recipient e-mail address es.

Back-bombardment power for A the RF system proposed in this work, and B a DC based system which has previously been published. Author information Article notes Copyright and License information Disclaimer. Again, it can be seen that these fields do not affect the behavior of the accelerator. The normalized emittance at the target was calculated using Eq.

A novel electron accelerator for MRI-Linac radiotherapy

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We have also shown that such a system is far more robust than conventional systems to the presence of in-line magnetic fields, and as such could be an ideal solution for next generation in-line MRI-Linac systems.

Performance in magnetic fields In order to assess the performance of the RF gun accelerator in the presence of in-line magnetic fields, the particle in cell model from Sec.

For each acceletators, the beam assessment was repeated. However, these results are probably not representative of what would be obtained in real systems for several reasons.

The model was then coupled to the fields from a simulated 1 T superconducting magnet and solved for cathode to isocenter distances between 1. On the other hand, if the dose per pulse remains consistent i.

Model of thermionic emission Based on Eq. The waveguide structure was discretized into 4. For the zero field solution, the average current at the target was Please create a new list with a new name; move some items to a new or existing list; or delete some items.

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This refers to electrons which are accelerated back toward the cathode, where they deposit unwanted power. For comparison purpose, the values published by St.

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Medical Electron Accelerators – C. J. Karzmark, Craig S. Nunan, Eiji Tanabe – Google Books

The goal of these efforts is to enable in-room MRI for anatomic and physiological treatment adaptation and response monitoring. As such, the orientation of the accelerator with respect to the MRI scanner becomes important.

However, both karamark have been solved in many other RF guns previously and as such are not anticipated to present major challenges. Semicon Associates, available from http: However, this work is intended as a proof of principle, and the explicit modeling of an input power port is not anticipated to significantly affect the results. In order to compare this to a conventional system, the RF source from Sec. The specific medifal or preferences of your reviewing publisher, classroom teacher, institution or organization should be applied.