Space charge limited current emission for a sharp tip
In this paper, we formulate a self-consistent model to study the space charge limited current emission from a sharp tip in a dc gap. The tip is assumed to have a radius in the order of 10s nanometer. The electrons are emitted from the tip due to field emission process. It is found that the localized...
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| Veröffentlicht in: | Physics of plasmas 2015-05, Vol.22 (5) |
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| container_title | Physics of plasmas |
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| creator | Zhu, Y. B. Ang, L. K. |
| description | In this paper, we formulate a self-consistent model to study the space charge limited current emission from a sharp tip in a dc gap. The tip is assumed to have a radius in the order of 10s nanometer. The electrons are emitted from the tip due to field emission process. It is found that the localized current density J at the apex of the tip can be much higher than the classical Child Langmuir law (flat surface). A scaling of J ∝ Vg3/2/Dm, where Vg is the gap bias, D is the gap size, and m = 1.1–1.2 (depending on the emission area or radius) is proposed. The effects of non-uniform emission and the spatial dependence of work function are presented. |
| doi_str_mv | 10.1063/1.4919936 |
| format | Article |
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B. ; Ang, L. K.</creator><creatorcontrib>Zhu, Y. B. ; Ang, L. K.</creatorcontrib><description>In this paper, we formulate a self-consistent model to study the space charge limited current emission from a sharp tip in a dc gap. The tip is assumed to have a radius in the order of 10s nanometer. The electrons are emitted from the tip due to field emission process. It is found that the localized current density J at the apex of the tip can be much higher than the classical Child Langmuir law (flat surface). A scaling of J ∝ Vg3/2/Dm, where Vg is the gap bias, D is the gap size, and m = 1.1–1.2 (depending on the emission area or radius) is proposed. The effects of non-uniform emission and the spatial dependence of work function are presented.</description><identifier>ISSN: 1070-664X</identifier><identifier>EISSN: 1089-7674</identifier><identifier>DOI: 10.1063/1.4919936</identifier><language>eng</language><publisher>Melville: American Institute of Physics</publisher><subject>70 PLASMA PHYSICS AND FUSION TECHNOLOGY ; CURRENT DENSITY ; Dependence ; ELECTRONS ; Emission analysis ; Emissions control ; FIELD EMISSION ; Flat surfaces ; Plasma physics ; SPACE CHARGE ; SPACE DEPENDENCE ; WORK FUNCTIONS</subject><ispartof>Physics of plasmas, 2015-05, Vol.22 (5)</ispartof><rights>2015 AIP Publishing LLC.</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c285t-18ba04b93f9053252f6e9a253a9be0e12b8fb9b50aade618d47daad6dbcb7f2f3</citedby><cites>FETCH-LOGICAL-c285t-18ba04b93f9053252f6e9a253a9be0e12b8fb9b50aade618d47daad6dbcb7f2f3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>230,314,776,780,881,27901,27902</link.rule.ids><backlink>$$Uhttps://www.osti.gov/biblio/22410286$$D View this record in Osti.gov$$Hfree_for_read</backlink></links><search><creatorcontrib>Zhu, Y. B.</creatorcontrib><creatorcontrib>Ang, L. K.</creatorcontrib><title>Space charge limited current emission for a sharp tip</title><title>Physics of plasmas</title><description>In this paper, we formulate a self-consistent model to study the space charge limited current emission from a sharp tip in a dc gap. The tip is assumed to have a radius in the order of 10s nanometer. The electrons are emitted from the tip due to field emission process. It is found that the localized current density J at the apex of the tip can be much higher than the classical Child Langmuir law (flat surface). A scaling of J ∝ Vg3/2/Dm, where Vg is the gap bias, D is the gap size, and m = 1.1–1.2 (depending on the emission area or radius) is proposed. 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K.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c285t-18ba04b93f9053252f6e9a253a9be0e12b8fb9b50aade618d47daad6dbcb7f2f3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2015</creationdate><topic>70 PLASMA PHYSICS AND FUSION TECHNOLOGY</topic><topic>CURRENT DENSITY</topic><topic>Dependence</topic><topic>ELECTRONS</topic><topic>Emission analysis</topic><topic>Emissions control</topic><topic>FIELD EMISSION</topic><topic>Flat surfaces</topic><topic>Plasma physics</topic><topic>SPACE CHARGE</topic><topic>SPACE DEPENDENCE</topic><topic>WORK FUNCTIONS</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Zhu, Y. B.</creatorcontrib><creatorcontrib>Ang, L. K.</creatorcontrib><collection>CrossRef</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>OSTI.GOV</collection><jtitle>Physics of plasmas</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Zhu, Y. B.</au><au>Ang, L. K.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Space charge limited current emission for a sharp tip</atitle><jtitle>Physics of plasmas</jtitle><date>2015-05-01</date><risdate>2015</risdate><volume>22</volume><issue>5</issue><issn>1070-664X</issn><eissn>1089-7674</eissn><abstract>In this paper, we formulate a self-consistent model to study the space charge limited current emission from a sharp tip in a dc gap. The tip is assumed to have a radius in the order of 10s nanometer. The electrons are emitted from the tip due to field emission process. It is found that the localized current density J at the apex of the tip can be much higher than the classical Child Langmuir law (flat surface). A scaling of J ∝ Vg3/2/Dm, where Vg is the gap bias, D is the gap size, and m = 1.1–1.2 (depending on the emission area or radius) is proposed. The effects of non-uniform emission and the spatial dependence of work function are presented.</abstract><cop>Melville</cop><pub>American Institute of Physics</pub><doi>10.1063/1.4919936</doi></addata></record> |
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| ispartof | Physics of plasmas, 2015-05, Vol.22 (5) |
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| source | AIP Journals Complete; Alma/SFX Local Collection |
| subjects | 70 PLASMA PHYSICS AND FUSION TECHNOLOGY CURRENT DENSITY Dependence ELECTRONS Emission analysis Emissions control FIELD EMISSION Flat surfaces Plasma physics SPACE CHARGE SPACE DEPENDENCE WORK FUNCTIONS |
| title | Space charge limited current emission for a sharp tip |
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