Analysis of Processes Linked to Cathode Emission: Barrier Thinning, Field Enhancement and Strong Local Heating

Ravindra Joshi; Alireza Majzoobi; Hao Qiu

Analysis of Processes Linked to Cathode Emission: Barrier Thinning, Field Enhancement and Strong Local Heating

Ravindra Joshi, Alireza Majzoobi, Hao Qiu

Electrical and Computer Engineering

Research output: Contribution to conference › Paper › peer-review

Abstract

Intense electron emission from cathodes that provide very high current densities (several kA/cm2) are necessary for a various applications such as high power microwaves, free electron lasers, in plasma physics, and for surface modifications and material processing. The presence of an ion near the cathode emitting surface can lower the barrier, which increases Schottky emission. In addition, width of the barrier for electron tunneling is reduced that can enhance the output currents. Finally, due to larger currents, one can expect localized heating at the cathode tips1 that would lead to phonon-assisted contribution to the emission current. In this contribution, we present an analysis of changes in the tunneling currents due to reduction in barrier width because of the presence of an ion in close proximity to the emitting cathode. Changes in the tunneling probability are evaluated due to reductions in the barrier thickness. Analysis for increases in temperature based on a Boltzmann an

Original language	English
State	Published - Dec 2015

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title = "Analysis of Processes Linked to Cathode Emission: Barrier Thinning, Field Enhancement and Strong Local Heating",

abstract = "Intense electron emission from cathodes that provide very high current densities (several kA/cm2) are necessary for a various applications such as high power microwaves, free electron lasers, in plasma physics, and for surface modifications and material processing. The presence of an ion near the cathode emitting surface can lower the barrier, which increases Schottky emission. In addition, width of the barrier for electron tunneling is reduced that can enhance the output currents. Finally, due to larger currents, one can expect localized heating at the cathode tips1 that would lead to phonon-assisted contribution to the emission current. In this contribution, we present an analysis of changes in the tunneling currents due to reduction in barrier width because of the presence of an ion in close proximity to the emitting cathode. Changes in the tunneling probability are evaluated due to reductions in the barrier thickness. Analysis for increases in temperature based on a Boltzmann an",

author = "Ravindra Joshi and Alireza Majzoobi and Hao Qiu",

year = "2015",

month = dec,

language = "English",

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TY - CONF

T1 - Analysis of Processes Linked to Cathode Emission: Barrier Thinning, Field Enhancement and Strong Local Heating

AU - Joshi, Ravindra

AU - Majzoobi, Alireza

AU - Qiu, Hao

PY - 2015/12

Y1 - 2015/12

N2 - Intense electron emission from cathodes that provide very high current densities (several kA/cm2) are necessary for a various applications such as high power microwaves, free electron lasers, in plasma physics, and for surface modifications and material processing. The presence of an ion near the cathode emitting surface can lower the barrier, which increases Schottky emission. In addition, width of the barrier for electron tunneling is reduced that can enhance the output currents. Finally, due to larger currents, one can expect localized heating at the cathode tips1 that would lead to phonon-assisted contribution to the emission current. In this contribution, we present an analysis of changes in the tunneling currents due to reduction in barrier width because of the presence of an ion in close proximity to the emitting cathode. Changes in the tunneling probability are evaluated due to reductions in the barrier thickness. Analysis for increases in temperature based on a Boltzmann an

AB - Intense electron emission from cathodes that provide very high current densities (several kA/cm2) are necessary for a various applications such as high power microwaves, free electron lasers, in plasma physics, and for surface modifications and material processing. The presence of an ion near the cathode emitting surface can lower the barrier, which increases Schottky emission. In addition, width of the barrier for electron tunneling is reduced that can enhance the output currents. Finally, due to larger currents, one can expect localized heating at the cathode tips1 that would lead to phonon-assisted contribution to the emission current. In this contribution, we present an analysis of changes in the tunneling currents due to reduction in barrier width because of the presence of an ion in close proximity to the emitting cathode. Changes in the tunneling probability are evaluated due to reductions in the barrier thickness. Analysis for increases in temperature based on a Boltzmann an

M3 - Paper

ER -