The improvement of the output performance of a low energy medical standing wave accelerator

Zhao, Hongbo; Carter, Richard G.; Hannaford, C. D.; Zhou, Peng; Hughes, E. A.

doi:10.1016/0168-9002(94)01248-2

Cited by 9 publications

(4 citation statements)

References 5 publications

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“…Because of this, an unloaded (no electron beam) accelerator must be over‐coupled in order to have optimal coupling when beam‐loaded (with an electron beam). The amount of over‐coupling required for optimal coupling of a beam‐loaded accelerator is a function of the beam current and energy, and must be determined empirically. However, because the waveguide simulations are completed in COMSOL and are separate from the electron beam simulations, it is impossible to accurately model the effects of beam loading on RF coupling.…”

Section: Methodsmentioning

confidence: 99%

Design and simulation of a short, variable-energy 4 to 10 MV S-band linear accelerator waveguide

2017

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Section: Methodsmentioning

confidence: 99%

Design and simulation of a short, variable-energy 4 to 10 MV S-band linear accelerator waveguide

2017

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“…In 1995, H.B. Zhao et al published an equation for the optimal coupling coefficient in order to maximize the dose rate at a specific input power [27]:…”

Section: The Injection Portmentioning

confidence: 99%

“…where, n is the experimental value that is obtained for different output energies. According to the reference [27] for a 6 MeV tube, the value of n is 2.8, giving an optimal coupling coefficient of 2.11. This means S 11 should be −8.9 dB.…”

Section: The Injection Portmentioning

confidence: 99%

Design of a side coupled standing wave accelerating tube for NSTRI e-Linac

Zarei¹,

Davani

Rachti³

et al. 2017

J. Inst.

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The design and construction of a 6 MeV electron linear accelerator (e-Linac) was defined in the Institute of Nuclear Science and Technology (NSTRI) for cargo inspection and medical applications. For this accelerator, a side coupled standing wave tube resonant at a frequency of 2998.5 MHZ in π/2 mode was selected. In this article, the authors provide a step-by-step explanation of the process of the design for this tube.The design and simulation of the accelerating and coupling cavities were carried out in five steps; (1) separate design of the accelerating and coupling cavities, (2) design of the coupling aperture between the cavities, (3) design of the entire structure for resonance at the nominal frequency, (4) design of the buncher, and (5) design of the power coupling port. At all design stages, in addition to finding the dimensions of the cavity, the impact of construction tolerances and simulation errors on the electromagnetic parameters were investigated. The values obtained for the coupling coefficient, coupling constant, quality factor and capture efficiency are 2.11, 0.011, 16203 and 36%, respectively.The results of beam dynamics study of the simulated tube in ASTRA have yielded a value of 5.14 π-mm-mrad for the horizontal emittance, 5.06 π-mm-mrad for the vertical emittance, 1.17 mm for the horizontal beam size, 1.16 mm for the vertical beam size and 1090 keV for the energy spread of the output beam.

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“…The fifth and last design stage is the design of a coupling port that feeds power from the magnetron, through the transmission waveguide into the linac waveguide. In 1995, Zhao et al 27 published a formula that determines the optimal coupling coefficient from a known input power with the goal of maximizing dose rate. With an input power of 2.3 MW, the optimal coupling coefficient was calculated to be 2.11.…”

Section: Fig 2 a Cutaway Section Of The Waveguide Terminated In Halmentioning

confidence: 99%

The design of a simulated in‐line side‐coupled 6 MV linear accelerator waveguide

2010

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A full 3D design for an in-line side-coupled 6 MV linear accelerator that emulates a common commercial waveguide has been given. The effect of the side coupling on the dose distribution has been shown to create a slight asymmetry, but overall does not affect the clinical applicability of the linac. The 3D in-line side-coupled linac model further provides a tool for the investigation of linac performance within an external magnetic field, which exists in an integrated linac-MR system.

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The improvement of the output performance of a low energy medical standing wave accelerator

Cited by 9 publications

References 5 publications

Design and simulation of a short, variable-energy 4 to 10 MV S-band linear accelerator waveguide

Design and simulation of a short, variable-energy 4 to 10 MV S-band linear accelerator waveguide

Design of a side coupled standing wave accelerating tube for NSTRI e-Linac

The design of a simulated in‐line side‐coupled 6 MV linear accelerator waveguide

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