An effective secondary electron emission suppression treatment for copper MDC electrodes

Curren, A. N.; Long, Kenwyn J.; Jensen, K. A.; Roman, Robert F.

doi:10.1109/iedm.1993.347198

Cited by 14 publications

(11 citation statements)

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“…For instance, although most calculations 8 seem to indicate a general increase of SEY with surface roughness, one of the methods to reduce secondary emission electrons on copper surfaces is by using an ion-beam process or bake out at atmospheric pressure that produces deeply textured surfaces. 9,10 In this work, the results on the relationship between the surface nanomorphology and SEY are also shown. Low-energy ion beams were used as a surface-processing tool.…”

Section: Introductionmentioning

confidence: 72%

Secondary electron emission and photoemission studies on surface films of carbon nitride

Ripalda¹,

Montero

Vázquez

et al. 2006

Journal of Applied Physics

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The secondary electron emission yield of fullerene, graphite, and diamondlike carbon after low-energy N 2 + ion bombardment was studied for antimultipactor applications. Nitrogen incorporation into the carbon thin films decreases their secondary emission yield, contrary to the hydrogen or oxygen effect. Carbon nitride surface textured to a nanometric scale had the property of hindering secondary electron emission. Valence bands obtained from photoemission spectroscopy using synchrotron radiation were correlated with secondary electron emission measurements. Multipactor threshold power for carbon nitride was 7.5 kW.

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Section: Introductionmentioning

confidence: 72%

Secondary electron emission and photoemission studies on surface films of carbon nitride

Ripalda¹,

Montero

Vázquez

et al. 2006

Journal of Applied Physics

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“…(Incidentally, this combination was the result of some iterations along the way.) In this case, the original idea was to imitate in a gross way the texturing of the surface [15], which tends to reduce the backscatter coefficient by trapping emitted electrons. However an examination of the data on impact vectors, makes us consider also an alternative explanation for the improvement in collector efficiency that has been observed, as presented shortly.…”

Section: Modifications In Collector Geometry and Results Obtainedmentioning

confidence: 99%

Improvements in Depressed Collector Performance by Modifications to Electrode Geometry Vis-a-Vis Trajectories of Backscattered Electrons

Singh

Valfells

Kolander

et al. 2004

IEEE Trans. Plasma Sci.

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Backscattering of electrons in depressed collectors has a significant effect on the collector efficiency and other performance parameters. We have studied these phenomena using our code BSCAT. It allows for tracking of multiple generations of backscatter by a representative set of trajectories without going to an excessively large number of them. By examining the trajectories and the impact angles of incoming rays, it is possible to modify the geometry of the electrodes, such that the effects of backscatter are minimized. In particular, we have studied the effects of using an undulating surface of the collector, and analyzed its effects taking into account the effect on angles of incidence of impacting rays. Using as a test vehicle a two-stage depressed collector for a 1.5-MW 110-GHz gyrotron, we have thus been able to increase the estimated collector efficiency from 62% to 65%. We present these results along with data on other performance parameters such as the heat-dissipation profile. We discuss the potential for application of the approach to other devices operating at different frequencies and power levels.

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“…Traveling wave tube (TWT), a vital vacuum electronic device, has been widely used in satellite communications, radar, etc. [1][2][3][4][5]. The collector efficiency and beam wave interaction efficiency are the two major reasons for the efficiency enhancement of the TWT.…”

Section: Introductionmentioning

confidence: 99%

“…Previous studies demonstrated that MDC efficiency can be improved significantly with the secondary electron yield (SEY) of the inner surface of MDCs less than one [3,6]. In the earlier study [6], it was found that the maximum SEY (δ max ) of molybdenum masked ion-textured OFHC (oxygen-free high-conductivity copper) prepared by different ion-texturing parameters varied between 0.30 and 0.55 with the primary electron energy range of 200-2000 eV.…”

Section: Introductionmentioning

confidence: 99%

“…Besides, the suppression of secondary electron emission can also enhance the efficiency of the MDCs of vacuum electron devices. In order to reduce the emission of oxygen-free high-conductivity copper (OFHC), the most commonly used material for MDC electrodes, the ion texturing method [3,6,13] and various low SEY film coatings such as diamond-like carbon (DLC) [4] and TiC film coatings [14] were employed to obtain a low SEY OFHC surface. Mingqing Ding et al studied the preparation and characterization of the molybdenum films deposition on MDC surfaces to reduce SEY of the MDCs surface and improve the total efficiency of TWTs [13].…”

Section: Introductionmentioning

confidence: 99%

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Laser Induced Nano and Micro Structures of Molybdenum Surface Applied in Multistage Depressed Collector for Secondary Electron Suppression

et al. 2019

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The laser processing molybdenum metal surface method was first proposed to enhance the efficiency of multistage depressed collectors (MDCs). In this study, the secondary electron yield (SEY), surface geometrical morphologies and chemical states of laser processed Mo metal samples were characterized. For the first time, the effects of laser parameters and incident angle of primary electrons on the SEY property of laser induced nano and micro structures of molybdenum surface were investigated. The influence rule of laser processing patterns, power, pitch spacing, scanning speed on surface morphologies and SEY were systematically explored. A maximum SEY of laser processed Mo metal less than one was achieved. The Mo 3d and O 1s core level spectra of Mo metal before and after laser processing were analyzed in this study. Furthermore, the corresponding oxidation states of Mo as well as the relative distribution were elucidated.

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An effective secondary electron emission suppression treatment for copper MDC electrodes

Cited by 14 publications

References 1 publication

Secondary electron emission and photoemission studies on surface films of carbon nitride

Secondary electron emission and photoemission studies on surface films of carbon nitride

Improvements in Depressed Collector Performance by Modifications to Electrode Geometry Vis-a-Vis Trajectories of Backscattered Electrons

Laser Induced Nano and Micro Structures of Molybdenum Surface Applied in Multistage Depressed Collector for Secondary Electron Suppression

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