Recent Developments to the MICHELLE 2-D/3-D Electron Gun and Collector Modeling Code

Petillo, John; Nelson, Eric; DeFord, J.F.; Dionne, N.; Levush, B.

doi:10.1109/ted.2005.845800

Cited by 168 publications

(35 citation statements)

References 10 publications

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“…PIC is used to model the injection and acceleration of charge bunches especially when space charge complicates transport and causes emittance growth [19,[44][45][46][47][48]. Indeed, the needs of PIC codes suggest using the PCM approach to develop the "cathode" boundary of the PIC simulation.…”

Section: Gated Structuresmentioning

confidence: 99%

Space charge effects in field emission: One dimensional theory

Rokhlenko

Jensen

Lebowitz

2010

Journal of Applied Physics

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The current associated with field emission is greatly dependent on the electric field at the emitting electrode. This field is a combination of the electric field in vacuum and the space charge created by the current. The latter becomes more important as the current density increases. Here, a study is performed using a modified classical 1D ChildLangmuir description that allows for exact solutions in order to characterize the contributions due to space charge. Methods to connect the 1D approach to an array of periodic 3D structures are considered.

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Section: Gated Structuresmentioning

confidence: 99%

Space charge effects in field emission: One dimensional theory

Rokhlenko

Jensen

Lebowitz

2010

Journal of Applied Physics

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“…The same MICHELLE/ANALYST [26,34] code combination that was used to model the existing gun was also used to design a new improved gun that could be capable of meeting those requirements. Some of the changes are straightforward, such as removing the central hole to eliminate the interbunch current, and reducing the cathode diameter in order to lower the emittance, which requires operating at higher mean emission current density.…”

Section: Improved Electron Gun With Cathode Integrated Into the Acmentioning

confidence: 99%

“…Also, we want to test the effects of adding third harmonic drive to the cathode-grid circuit to reduce the electron bunch length. These measurements are then compared to simulations using the electron gun code MICHELLE [26] in order to model the diagnostics and to benchmark the simulations. MICHELLE simulations are also used to study an alternative electron gun design that can have improved transverse emittance and shorter electron bunch length.…”

Section: Introductionmentioning

confidence: 99%

Development of a high average current rf linac thermionic injector

Gold

Ting

Jabotinski³

et al. 2013

Phys. Rev. ST Accel. Beams

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Thermionic electron guns are capable of operating at high average currents in a variety of vacuum electronic applications, including conventional microwave tubes, but have been replaced by laser photocathode injectors for most applications requiring high-brightness electron beams. However, while laser photocathode guns are capable of providing the very high-brightness beams, they provide an increased level of system complexity and do not extrapolate well to injectors for high average current applications requiring high beam quality. We are developing a 714 MHz injector based on a gridded thermionic electron gun for these applications. This paper presents an experimental study, computer simulations, and analysis of the performance of an existing gridded thermionic electron gun as an injector prototype, and a design concept for an improved injector configuration based on these results.

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“…Employing this approach, a 19.5-kV, 3.6-A electron gun has been designed with the 3D gun code MICHELLE [2] in conjunction with the magnet code Maxwell 3D [3]. The cathode is a cylindrical cut surface with a rectangular cross-section of approximately 4 mm in width and 9.7 mm in height.…”

Section: Beam Formationmentioning

confidence: 99%