Radiation Measurements of a Medical Particle Accelerator Through a Passive Resonant Cavity release_5rgczclazff6lihpho7xhbhfhu

by Alberto Leggieri, Alessia Ciccotelli, Silvia De Stefano, Franco Di Paolo, Giuseppe Felici, Filippo Marangoni, Davide Passi, Henderson, Stuart (Ed.), Akers, Evelyn (Ed.), Satogata, Todd (Ed.), Volker RW Schaa

Published by JACoW, Geneva, Switzerland.

2015   Volume IPAC2015, USA


Beam monitoring system are required by technical standards for the real time measurement of the dose delivered to the target while the beam is crossing them * **. Traditional beam current monitoring systems are based on ionization chambers and requires high voltage biases *** ****. This study investigates on the measurements of the electron beam current emitted by a medical electron linear accelerator using the power exchange of the beam current with a passive resonant cavity ***** placed at the output interface of the accelerator. The cavity is magnetically coupled with a coaxial transmission line loaded on a microwave envelope detector and its output signal has been documented while receiving several electron currents. This paper shows the complete equivalency, in terms of global performance, of the current revelation performed by exploiting the cavity-beam interaction principle with the classical technology, based on ionization chambers, however without need of high voltage. The most important point is that the resonant cavity system, by measuring the beam current, gives a direct measurement of a physical observable quantity directly related with the dose deposed by the beam.
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Date   2015-08-19
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