What is the number of bunches per MU and what is the delay between them?
Panos Delinikolas
Thank you for your replies. Dr. Elashmawy your reply was extensive and very explainatory. Thank you.
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Giuseppe Felici
About electron density: this feature depends essentially on the general architecture and intended use of the machine: does it work in photon or electron mode or both? What kind of beam optics is present? As a preliminary info on the easiest systems, IOERT dedicated linac a current of maximum 1.5 mA per pulse is accelerated, that leads to a duse per pulse, at the end of the applicator, of about 3 cGy/p. Obviously each pulse is composed of micro-bunches as discussed by Dr. Elashmawy. You may find some additional info on this specific topic on the paper added in the link ; should you want the full text let me know and i will provide you. Radiotherapy linac working in photon mode are pretty more complex and the relation between the accelerated current inside the linac and the dose deposed on the target depends on the complex beam optic (primary and secondary collimator, MLC, etc). About waist: typical FWHM of the radial fluence at the end of the accelerating waveguide is around 1 mm, but still depends on the wave guide architecture and radial focusing system implemented
I would like to add some info, even though the answer of Dr. Elashmawy is deep and extensive.
Article Real-Time Beam Monitor for Charged Particle Medical Accelerators
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