Electron gun with electron-beam-heated point cathode: numerical analysis of electron beam for cathode tip heating

Iiyoshi, Ryo; Maruse, Susumu; Takematsu, Hideo

doi:10.1016/0168-9002(95)00055-0

Cited by 13 publications

(2 citation statements)

References 2 publications

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“…At the shallow bias conditions, the starting positions were increased to the cathode area of 50 μm, and the area was divided into 259 circular sections. The equation of motion was normalized with time (τ = e/mt) and a set of differential equations [15] was solved using the Adams-Moulton (predictor-corrector) method, putting an initial integrating time-step (Δτ) to 1 × 10 −7 and a tolerance for error control to 1 × 10 −5 . These values were chosen to save the computing time.…”

Section: Random Emitting Conditions and Ray Tracingmentioning

confidence: 99%

Numerical Study on Emission Characteristics of a Point Cathode Electron Gun: Determination of Space Charge using Random Emitting Conditions

Iiyoshi

2006

e-J. Surf. Sci. Nanotechnol.

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The emission characteristics of a point cathode thermionic electron gun have been studied with numerical method. The method is based on the integral form of Poisson equation. The field including the space charge is obtained by the iterative procedure, consisting of the field calculation, the electron ray tracing in 3D, and the determination of the space charge from the rays. The space charge distribution was determined from the rays traced with random emitting conditions considering energy and angular distributions and treated as many coaxial ring charges. The use of random emitting conditions leads to a self-consistent result after several iterations. The emission currents were calculated for different bias voltages and different cathode temperatures. The method provides the emission currents close to the measured values.

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Section: Random Emitting Conditions and Ray Tracingmentioning

confidence: 99%

Numerical Study on Emission Characteristics of a Point Cathode Electron Gun: Determination of Space Charge using Random Emitting Conditions

Iiyoshi

2006

e-J. Surf. Sci. Nanotechnol.

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“…The total number of the traced rays is 732 in the present study. The equation of motion in 3D [6] is solved with Adams-Moulton's method.…”

Section: Ray Tracingmentioning

confidence: 99%

Numerical analysis of space charge in a point cathode thermionic emission gun

Iiyoshi

2003

e-J. Surf. Sci. Nanotechnol.

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Space charge in a point cathode thermionic emission gun has been studied with numerical method. The method is an iterative one, consisting of the field determination using the integral form of Poisson's equation, the direct ray tracing in 3D, and the estimation of space charge from the traced rays. The rays are traced for limited emitting conditions. The estimated space charge is treated as a number of the coaxial charged rings with different radii and positions. Using the method, the potential distribution around the cathode tip was examined at different cathode temperatures. The numerical results at the cathode temperatures of 2800 K and 2950 K are given, and the influence of space charge is discussed.

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High Emittance Electron Beam Source Coupled to Slab Loaded Accelerating Structure

Zafar

Masood³

et al. 2008

Int J Infrared Milli Waves

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High power line source emitter assembly was coupled to a twin symmetric Hplane slab loaded accelerating structure for beam acceleration. Closed form field analysis of the accelerating structure that includes guideline information regarding modal hierarchy, mode nomenclature, propagation plane, cut-off plane and dispersion relations is presented. Furthermore it was confirmed that by using symmetrically loaded dielectric accelerating structures with one rotated through 90°results in exerting a uniform acceleration impact on a travelling beam passing through the structure.

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Electron gun with electron-beam-heated point cathode: numerical analysis of electron beam for cathode tip heating

Cited by 13 publications

References 2 publications

Numerical Study on Emission Characteristics of a Point Cathode Electron Gun: Determination of Space Charge using Random Emitting Conditions

Numerical Study on Emission Characteristics of a Point Cathode Electron Gun: Determination of Space Charge using Random Emitting Conditions

Numerical analysis of space charge in a point cathode thermionic emission gun

High Emittance Electron Beam Source Coupled to Slab Loaded Accelerating Structure

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