Analytical studies of the plasma extraction electrodes and ion beam formation

Hassan, A.M.; El-Saftawy, A.A.; Zakhary, S. G.

doi:10.1016/j.nima.2007.11.066

Cited by 6 publications

(5 citation statements)

References 11 publications

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“…Hence to obtain a minimu m beam waist we have to use a low perveance beam. These results are in a very close agreement with the computer simulat ion results previously reported [21].Finally, the increase of the beam width with the increase of z and the decrease of this width with the increasing of the ext racting voltages are ev ident fro m figures 4 and 5. The space charge effect is believed to be the cause of the divergence of the electron beam; while the focusing property of the anode aperture imp roves the beam profile confinement i.e.…”

Section: Electron Beam Profile and Emi Ttance Analysissupporting

confidence: 90%

Investigation of Beam Performance Parameters in a Pierce-Type Electron Gun

El-Saftawy¹,

Elfalaky²,

Ragheb³

et al. 2012

SCIT

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In the present work, an investigation has been made for the ext raction characteristics and beam diagnosis for a Pierce-type electron gun with spherical anode to acquire an electron beam suitable for different applications. The acceleration voltage increases the electron beam currents up to 250 mA at Accelerat ion voltage 75kV and decreases the beam perveance, beam waist and beam emittance. The min imu m beam radius could be found at the min imu m beam perveance and maximu m convergence angle. Also the increase of the accelerating voltage affects the increase of the beam fluence rate up to 1.3 x 10 18 e/min.cm 2 , due to the increase of the extracted current. Tracing the electron beam profile by X-Y p robe scanner along the beam line at two different places reveals that the spherical anode affects the beam to be convergent. The electron beam could be suited for the two suggested experiments in our lab, p lasma acceleration and surface modifications of poly mers.

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Section: Electron Beam Profile and Emi Ttance Analysissupporting

confidence: 90%

Investigation of Beam Performance Parameters in a Pierce-Type Electron Gun

El-Saftawy¹,

Elfalaky²,

Ragheb³

et al. 2012

SCIT

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“…Similar methods can be adapted to study alternative ion acceleration configurations and/or plasma thrusters. Such as Hall-effect or gridded ion engines [10][11][12][13][14] using affordable computational resources.…”

Section: Discussionmentioning

confidence: 99%

Plasma Thrusters for In-Space Propulsion; New Trends and Physical Limitations

Dyubo

González

Tsybin

et al. 2020

Springer Proceedings in Physics

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In-space plasma propulsion is today a necessity for the economic competitiveness of commercial satellites. In plasma thrusters the impulse is imparted by a mesothermal plasma jet where ions drift a supersonic velocities. Compact multielectrode systems for ion acceleration are studied by a combination of analytical calculations and computer simulations. The results show exahust speeds of 140 km/s can be reached with specific impulses higher than unsual plasma thrusters. Additionally, the ion velocity distribution functions of the plasma jet exhasut obtained with retarded field energy analyzers that can be used to cross validate the results of numerical simulations.

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“…For instance using a plane extraction electrode, an aberration arises in the extracted beams [12]. To overcome this divergent electron flow effect and to study the beam control parameters, a shaped extraction electrode in spherical modelling system will be investigated.…”

Section: Theoretical Model Descriptionmentioning

confidence: 99%

“…According to the gun geometry, the resulting electron beam propert ies will be studied. In order to perform this theoretical simulat ion, different gun models are p reviously studied [12]. The results are co mpared to the present electron gun design.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Beam Formation and Transport in an Electron Gun for Different Applications

El-Saftawy¹,

Elfalaky²,

Ragheb³

et al. 2012

JNPP

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A Pierce-type electron gun with spherical anode has been numerically co mputer-aided analysed to yield an appropriate beam with suitable properties valid for d ifferent applications. It has been proven that, around a certain value of the aspect ratio, 0.75, the resultant beam geometry could be suitably controlled. The gun geometry plays an important role for beam shaping; parallel, converged or diverged. The min imu m electric field required to prevent beam expansion due to space charge effect has been estimated and it is found to be proportional to the cubic root of the d istance fro m the anode to the target (Z 1/3 ). Also, it is proved that the minimu m beam radius is realized at the minimu m beam perveance and the maximu m beam convergence angle. As a result, this reveals that, the gun geometry controls the beam emittance. The gun design analysis proposed here helps to choose the better operating conditions suitable for low energy electron beam bo mbard ment and/or injection applications.

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Analytical studies of the plasma extraction electrodes and ion beam formation

Cited by 6 publications

References 11 publications

Investigation of Beam Performance Parameters in a Pierce-Type Electron Gun

Investigation of Beam Performance Parameters in a Pierce-Type Electron Gun

Plasma Thrusters for In-Space Propulsion; New Trends and Physical Limitations

Numerical Simulation of Beam Formation and Transport in an Electron Gun for Different Applications

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