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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As such, we conclude that a RF-gun based accelerator is capable of robust qccelerators without magnetic shielding in a wide range of in-line magnetic fields. This has two effects—first, it can damage the cathode and reduce its lifetime. The E-mail Address es field is required. As such, the orientation of the accelerator with respect to the MRI scanner becomes important. The effects of both in-line and perpendicular magnetic fields on linear accelerator operation have previously been studied via computational simulations.

C were exported to matlab for further analysis. The alternative, ferromagnetic shielding, causes distortion in the imaging field of the MRI scanner. Comparison of the electron current from a conventional and RF electron source at the beginning source and end target of the accelerator.

If electrons with a radial coordinate greater than 2 mm the cathode radius used in this work are filtered out then the RF back-bombardment power decreases to However, such effects were previously investigated by St.


Beam assessment at the target In order to assess the performance of the RF gun based accelerator, a beam monitor medicql placed at the exit of the simulation; particle information was scored as it crossed this monitor and exported to matlab for xccelerators analysis.

The last step of the study was to compare the zero magnetic field behavior of the novel accelerator with its performance in magnetic fields.

Books by Clarence J. J. Karzmark

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Home About Help Search. Various figures of merit extracted from the simulations.

Medical electron accelerators | Open Library

The E-mail Address es you entered is are not in a valid format. The losses in the waveguide were calculated as a postprocessing step, which uses perturbation theory based on the magnetic field distribution at the walls. For comparison purpose, the values published by St. There have also been triode based RF guns proposed—such a structure may be able to improve the system latency to that achievable with DC triode guns.

Note the way that low energy acceleratora are deflected when they pass through the nose cones at the wrong phase.

The accelerated electron beam is then typically collided with a tungsten target to produce a bremsstrahlung photon beam. Beams 14 6 English View all editions and formats Rating: Linked Data More info about Linked Data.

In conventional medical DC electron guns, a relatively low kilovoltage electrostatic field is applied to a thermionic cathode, resulting in space charge limited thermionic emission acccelerators space charge of the beam limits the emitted current. A conductivity of 5.


As the sources aaccelerators loss acceleartors to the conducting walls and to the beam are very similar to previously published work, the required input power will also be similar to this—around 2. A large amount of strategies to mitigate the back-bombardment effect in RF guns has already been published, and given that there is accelerarors at least one system in existence operating at similar pulse lengths and energies as would be required for this system the Kyoto University free electron laser injectorit is reasonable to believe that this effect could be managed.

However, these results are probably not representative of what would be obtained in real systems for several reasons. Radiofrequency field calculation The next step was to calculate the RF fields to which the electrons will be subject while in the accelerating structure.

One of these is beam stability. Further details on this method can be found in Ref.

As will be seen in Sec. The mean target current of the RF based source is