The Coadsorption of Cs and Ba onto the (110) Surface of Mo

Magera, Gerald G.; Davis, P.R.

doi:10.1063/1.2950118

Cited by 4 publications

(4 citation statements)

References 6 publications

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“…The work function change due to co-adsorbed Cs required to achieve the higher emission current at the first knee, is 0.09 eV. A work function change of this magnitude is reasonable according to Magera and Davis (1994), who showed that even with high Ba coverage, the addition of Cs vapor can cause a work function change of 0.2 eV. A similar result was reported by Psarouthakis (1969).…”

Section: The Second Kneesupporting

confidence: 72%

“…The greater hysteresis of the I-V curves at lower TBa is due in part to the reduced Ba coverage on the collector, which increases H for Cs (Magera and Davis 1994). As explained in the previous section, increasing H widens the I-V characteristic ( Figure 5.16a).…”

Section: Effect Of Barium Pressure On I-v Characteristicsmentioning

confidence: 54%

“…This allows the emitter work function to be lowered without otherwise affecting the discharge (Baksht et al 1970). The minimum work function of a grid coated with adsorbed Ba is greater than the minimum work hnction of the same grid coated with Cs (Magera and Davis 1994), which allows the use of higher emitter temperatures (1400 --1500 K) without unacceptable levels of emission from the grid.…”

Section: Cs-ba Tacitronmentioning

confidence: 99%

“…As stated in Chapter 1, Ba vapor is added to the gap to reduce the emitter work function below that of bare Mo, to increase the emission current. The work function is further reduced by the presence of a small amount of Cs co-adsorbed with the Ba on the emitter surface (Psarouthakis 1969, Konoplev et al 1972, Magera and Davis 1994.…”

Section: The Second Kneementioning

confidence: 99%

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A transient model of a cesium-barium diode

Luke¹,

El-Genk²

1995

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In this work a transient model of a Cs-Ba diode is developed, and a series of experiments is performed using a diode equipped with Langmuir probes. The Langmuir probe data show that the electron energy distribution is non-Maxwellian at low discharge currents, indicating the presence of an electron beam from the emitter. Experimental results also showed that the plasma properties are non-homogeneous across the 1 mm diode gap; the electron temperature and plasma potential were higher near the emitter and the plasma density was higher near the collector. Experimental evidence is presented to show that the discharge contracts to a filament below the maximum thermal emission current. The model calculations show that the Cs pressure in the gap decreases during the discharge to an equilibrium value lower than the original pressure. The effect of the desorption rate of Cs on the time for the pressure to reach this equilibrium is calculated.Increasing the value of the desorption energy is found to increase the hysteresis of the calculated I-V curves. An empirical value of 1.75 eV for the desorption energy is determined by comparison of the hysteresis of calculated and measured I-V curves.vi

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Section: The Second Kneesupporting

confidence: 72%

Section: Effect Of Barium Pressure On I-v Characteristicsmentioning

confidence: 54%

Section: Cs-ba Tacitronmentioning

confidence: 99%

Section: The Second Kneementioning

confidence: 99%

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A transient model of a cesium-barium diode

Luke¹,

El-Genk²

1995

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Effective Work Functions of the Elements

Kawano

2022

Progress in Surface Science

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Low-pressure Cs-Ba discharge. I. Model development

Luke

El‐Genk

1995

Journal of Applied Physics

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A transient model of a low-pressure Cs-Ba diode which operates in a collisionless Knudsen mode is developed and benchmarked with experimental measurements. The model couples the external circuit to the plasma discharge in the diode. The model calculates the electron energy, plasma density, densities of ground state and first four excited states of neutral Cs atoms, sheath potentials, Cs coverage on the electrode surfaces, forward voltage drop, and discharge current as functions of time, as well as the current-voltage (I-V) characteristic of the diode. Calculated terminal voltage and current characteristics are in good agreement with experimental values.

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The Coadsorption of Cs and Ba onto the (110) Surface of Mo

Cited by 4 publications

References 6 publications

A transient model of a cesium-barium diode

A transient model of a cesium-barium diode

Effective Work Functions of the Elements

Low-pressure Cs-Ba discharge. I. Model development

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