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SIMAC Electronics linear accelerator
Diagram of linear <t>accelerator</t> system simulated in this work. A klystron amplifier is pulsed with high voltage created by discharge in a capacitor bank (pulse‐forming network), causing amplification of low‐power microwaves. This RF power is used to accelerate electrons injected into an accelerator waveguide, which can be steered by magnets. A bend magnet is used to redirect the high‐energy electrons onto a target, producing bremsstrahlung photons. These photons are processed in a collimation and flattening system to produce a clinical beam.
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Article Title: Simulation of a medical linear accelerator for teaching purposes

Journal: Journal of Applied Clinical Medical Physics

doi: 10.1120/jacmp.v16i3.5139

Diagram of linear accelerator system simulated in this work. A klystron amplifier is pulsed with high voltage created by discharge in a capacitor bank (pulse‐forming network), causing amplification of low‐power microwaves. This RF power is used to accelerate electrons injected into an accelerator waveguide, which can be steered by magnets. A bend magnet is used to redirect the high‐energy electrons onto a target, producing bremsstrahlung photons. These photons are processed in a collimation and flattening system to produce a clinical beam.
Figure Legend Snippet: Diagram of linear accelerator system simulated in this work. A klystron amplifier is pulsed with high voltage created by discharge in a capacitor bank (pulse‐forming network), causing amplification of low‐power microwaves. This RF power is used to accelerate electrons injected into an accelerator waveguide, which can be steered by magnets. A bend magnet is used to redirect the high‐energy electrons onto a target, producing bremsstrahlung photons. These photons are processed in a collimation and flattening system to produce a clinical beam.

Techniques Used: Amplification, Injection

Maximum power output (a) from the klystron vs. peak voltage provided to the cathode. Power output (b) from the klystron vs. radiofrequency power driving it, for varying levels of cathode voltage. Beam energy (c) vs. beam current for two accelerator shunt impedances and three different klystron power levels input into the accelerator waveguide. For each of the three power levels, the largest slope load line has accelerator shunt impedance 47.88 MΩ, and the shallowest slope curve has shunt impedance of 16.57 MΩ. This is illustrated for the 9 MW curves. Average energy of electrons (d) accepted by the bending magnet versus current to the coils. Traces (e) of the mean electron energy (solid line), the root mean square electron scattering angle (dashed line), and the root mean square bremsstrahlung production angles (dashed‐dotted line), plotted as a function of thickness traversed through the target. The root mean square values were used to characterise the width of both Gaussian distributions.
Figure Legend Snippet: Maximum power output (a) from the klystron vs. peak voltage provided to the cathode. Power output (b) from the klystron vs. radiofrequency power driving it, for varying levels of cathode voltage. Beam energy (c) vs. beam current for two accelerator shunt impedances and three different klystron power levels input into the accelerator waveguide. For each of the three power levels, the largest slope load line has accelerator shunt impedance 47.88 MΩ, and the shallowest slope curve has shunt impedance of 16.57 MΩ. This is illustrated for the 9 MW curves. Average energy of electrons (d) accepted by the bending magnet versus current to the coils. Traces (e) of the mean electron energy (solid line), the root mean square electron scattering angle (dashed line), and the root mean square bremsstrahlung production angles (dashed‐dotted line), plotted as a function of thickness traversed through the target. The root mean square values were used to characterise the width of both Gaussian distributions.

Techniques Used:

Dose‐rate dependence on klystron pulse voltage (a) and accelerator gun current (b). On the left, the RF driver power was fixed at 67 W, the linac gun voltage was set to 10 kV, and the bending magnet was left at 150 A. On the right, the RF driver was set to 67 W, the klystron pulse was 125 kV, and the bending magnet 125 A. The linac gun voltage was varied from 7.5 V to 12.5 V, which resulted in gun currents ranging from 115 to 249 mA and variability in dose rate. The electron beam energy is also affected by accelerator current due to beam loading.
Figure Legend Snippet: Dose‐rate dependence on klystron pulse voltage (a) and accelerator gun current (b). On the left, the RF driver power was fixed at 67 W, the linac gun voltage was set to 10 kV, and the bending magnet was left at 150 A. On the right, the RF driver was set to 67 W, the klystron pulse was 125 kV, and the bending magnet 125 A. The linac gun voltage was varied from 7.5 V to 12.5 V, which resulted in gun currents ranging from 115 to 249 mA and variability in dose rate. The electron beam energy is also affected by accelerator current due to beam loading.

Techniques Used:

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Article Title: Simulation of a medical linear accelerator for teaching purposes
Article Snippet: The purpose of the SIMAC program is to simulate the functionality of a linear accelerator and to give the correct “feel” of adjusting linac service parameters.

Injection:

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Article Title: Simulation of a medical linear accelerator for teaching purposes
Article Snippet: The purpose of the SIMAC program is to simulate the functionality of a linear accelerator and to give the correct “feel” of adjusting linac service parameters.



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