Design study on compact hybrid standing-wave C-band linear accelerator for medical applications

New radiation therapy techniques such as Tomotherapy and Stereotactic radiotherapy require compact and higher power electron accelerators. In this paper a design of 10 MeV, 450 mA, compact, and hybrid standing wave C-band [5712 MHz] linear accelerator with peak power of 7 MW is presented to fulfil the demands of such new radiation therapy techniques. Standing wave structure that operates at [PI]/2 mode has been chosen for the design. Two different coupling techniques were utilized in the structure design; side coupling is used for regular accelerating section while the on-axis coupling is used in buncher section. A special hybrid cell is designed to connect the aforementioned sections such that the first half of this cell uses on axis coupling and fit to the buncher cell dimensions and the second half uses side coupling and fit to the regular cell dimension. Different cells of the design have been optimized using the computer, code SUPERFISH. PARMELA code is used to simulate the electrons' trajectories along the whole structure. Results from PARMELA indicate that the final energy is 10 MeV; the transmission ratio is 44%, and good energy spectrum with 18.6% span from the peak energy

Quasi monochromatic synchrotron radiation source based on compact X-band linear accelerator and terra watt laser for medical diagnostics

X-ray has many useful applications in different research field such as solid state physics, biology, microscopy, medical imaging and diagnostics. One of the great interests in medical application is the Coronary Arterio Graphy [CAG] in which the coronary artery is visualized by contrast agent [iodine] injected into the artery by a catheter that inserted into the artery. This technique is very invasive for patient and associated with high irradiation dose for the patient and for the medical doctor too due to the wide energy spectrum emitted from the X-ray tube used in this technique. In this paper we avoided all the shortcomings of the aforementioned technique by introducing a new, cheap and compact system to produce hard X-ray based on electron-laser collision which enables the physicians to visualize the coronary artery dynamically. The dynamic visualization was possible in this technique due to the high flux of the X-ray photons, which is about 10[11] photons/second. This technique utilizes the advantage of the K-edge attenuation of the iodine [Z = 53] at X-ray energy of 33.169 KeV; hence a monochromatic X-ray radiation just above this energy will give high contrast ratio and clear image. The contrast agent [iodine] in this technique will be injected intravenously instead of using a catheter that inserted into the artery. For that reason the new technique is known as an Intra Venous Coronary Arterio Graphy [IVCAG]. The X-ray flux generated from laser-electron collision has been optimized using CAIN code, while the accelerating cavities of the X-band linear accelerator were designed and optimized using SUPERFISH code. Several scenarios have been proposed to achieve our final goal of compact and stable hard x-ray sources. The progress of the system is presented too