Laser heated LaB/sub 6/ thermionic cathode on a MV electron beam accelerator
Summary form only given. One of the major problems in high voltage/current and long pulse e-beam generation is plasma diode closure. LaB/sub 6/, thermionic cathodes can eliminate plasma and are more robust from poisoning than oxide cathodes. To heat the LaB/sub 6/ disk on the MELBA cathode stalk at...
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| creator | Gilgenbach, R.M. Vollers, D. Jaynes, R. Rintamaki, J. Johnston, M. Cohen, W. Getty, W.D. Lau, Y.Y. Spencer, T.A. |
| description | Summary form only given. One of the major problems in high voltage/current and long pulse e-beam generation is plasma diode closure. LaB/sub 6/, thermionic cathodes can eliminate plasma and are more robust from poisoning than oxide cathodes. To heat the LaB/sub 6/ disk on the MELBA cathode stalk at -1 MV we employ a 100-650 W CW Nd:YAG laser. Depending upon the LaB/sub 6/ disk diameter (1 cm or 2.2 cm), temperature, and cathode shape, preliminary analysis of experiments suggests three e-beam modes: 1) Thermionic mode at electron beam current density of 100-150 A/cm/sup 2/, with current shape which matches the voltage flatness, 2) Plasma mode in which 2-6 kA of current is drawn with rapid current ramping, and 3) Combined thermionic and plasma mode with initial thermionic current turn-on which is later overtaken by plasma current. It is believed that the plasma modes may involve explosive edge emission or outgassing from a graphite cathode mounting structure. |
| doi_str_mv | 10.1109/PLASMA.1999.829611 |
| format | Conference Proceeding |
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One of the major problems in high voltage/current and long pulse e-beam generation is plasma diode closure. LaB/sub 6/, thermionic cathodes can eliminate plasma and are more robust from poisoning than oxide cathodes. To heat the LaB/sub 6/ disk on the MELBA cathode stalk at -1 MV we employ a 100-650 W CW Nd:YAG laser. Depending upon the LaB/sub 6/ disk diameter (1 cm or 2.2 cm), temperature, and cathode shape, preliminary analysis of experiments suggests three e-beam modes: 1) Thermionic mode at electron beam current density of 100-150 A/cm/sup 2/, with current shape which matches the voltage flatness, 2) Plasma mode in which 2-6 kA of current is drawn with rapid current ramping, and 3) Combined thermionic and plasma mode with initial thermionic current turn-on which is later overtaken by plasma current. It is believed that the plasma modes may involve explosive edge emission or outgassing from a graphite cathode mounting structure.</description><identifier>ISSN: 0730-9244</identifier><identifier>ISBN: 9780780352247</identifier><identifier>ISBN: 0780352246</identifier><identifier>EISSN: 2576-7208</identifier><identifier>DOI: 10.1109/PLASMA.1999.829611</identifier><language>eng</language><publisher>IEEE</publisher><subject>Cathodes ; Diodes ; Laser modes ; Optical pulse generation ; Plasma density ; Plasma temperature ; Robustness ; Shape ; Temperature dependence ; Voltage</subject><ispartof>IEEE Conference Record - Abstracts. 1999 IEEE International Conference on Plasma Science. 26th IEEE International Conference (Cat. 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It is believed that the plasma modes may involve explosive edge emission or outgassing from a graphite cathode mounting structure.</description><subject>Cathodes</subject><subject>Diodes</subject><subject>Laser modes</subject><subject>Optical pulse generation</subject><subject>Plasma density</subject><subject>Plasma temperature</subject><subject>Robustness</subject><subject>Shape</subject><subject>Temperature dependence</subject><subject>Voltage</subject><issn>0730-9244</issn><issn>2576-7208</issn><isbn>9780780352247</isbn><isbn>0780352246</isbn><fulltext>true</fulltext><rsrctype>conference_proceeding</rsrctype><creationdate>1999</creationdate><recordtype>conference_proceeding</recordtype><sourceid>6IE</sourceid><sourceid>RIE</sourceid><recordid>eNp9jk9rwkAUxB9WoUHzBTy9L5Bkd_Nns0eVlh4iCIpXea5PEjFGdrcHv30D7bnDwPCbuQzAUopUSmGyXbPab1epNMaktTKVlBOIVKmrRCtRv0FsdC1G56VShZ5CJHQuEqOK4h1i729iVFFKofIImoY8O2yZAl-woXXmv89YZRhadn03PDqLlkI7XBiHBxJuj8h3tsGNdGbqkawdC0dhcAuYXenuOf7LOSw_Pw6br6Rj5tPTdT251-n3cv7v-APZvkAh</recordid><startdate>1999</startdate><enddate>1999</enddate><creator>Gilgenbach, R.M.</creator><creator>Vollers, D.</creator><creator>Jaynes, R.</creator><creator>Rintamaki, J.</creator><creator>Johnston, M.</creator><creator>Cohen, W.</creator><creator>Getty, W.D.</creator><creator>Lau, Y.Y.</creator><creator>Spencer, T.A.</creator><general>IEEE</general><scope>6IE</scope><scope>6IH</scope><scope>CBEJK</scope><scope>RIE</scope><scope>RIO</scope></search><sort><creationdate>1999</creationdate><title>Laser heated LaB/sub 6/ thermionic cathode on a MV electron beam accelerator</title><author>Gilgenbach, R.M. ; Vollers, D. ; Jaynes, R. ; Rintamaki, J. ; Johnston, M. ; Cohen, W. ; Getty, W.D. ; Lau, Y.Y. ; Spencer, T.A.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-ieee_primary_8296113</frbrgroupid><rsrctype>conference_proceedings</rsrctype><prefilter>conference_proceedings</prefilter><language>eng</language><creationdate>1999</creationdate><topic>Cathodes</topic><topic>Diodes</topic><topic>Laser modes</topic><topic>Optical pulse generation</topic><topic>Plasma density</topic><topic>Plasma temperature</topic><topic>Robustness</topic><topic>Shape</topic><topic>Temperature dependence</topic><topic>Voltage</topic><toplevel>online_resources</toplevel><creatorcontrib>Gilgenbach, R.M.</creatorcontrib><creatorcontrib>Vollers, D.</creatorcontrib><creatorcontrib>Jaynes, R.</creatorcontrib><creatorcontrib>Rintamaki, J.</creatorcontrib><creatorcontrib>Johnston, M.</creatorcontrib><creatorcontrib>Cohen, W.</creatorcontrib><creatorcontrib>Getty, W.D.</creatorcontrib><creatorcontrib>Lau, Y.Y.</creatorcontrib><creatorcontrib>Spencer, T.A.</creatorcontrib><collection>IEEE Electronic Library (IEL) Conference Proceedings</collection><collection>IEEE Proceedings Order Plan (POP) 1998-present by volume</collection><collection>IEEE Xplore All Conference Proceedings</collection><collection>IEEE Electronic Library (IEL)</collection><collection>IEEE Proceedings Order Plans (POP) 1998-present</collection></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>Gilgenbach, R.M.</au><au>Vollers, D.</au><au>Jaynes, R.</au><au>Rintamaki, J.</au><au>Johnston, M.</au><au>Cohen, W.</au><au>Getty, W.D.</au><au>Lau, Y.Y.</au><au>Spencer, T.A.</au><format>book</format><genre>proceeding</genre><ristype>CONF</ristype><atitle>Laser heated LaB/sub 6/ thermionic cathode on a MV electron beam accelerator</atitle><btitle>IEEE Conference Record - Abstracts. 1999 IEEE International Conference on Plasma Science. 26th IEEE International Conference (Cat. No.99CH36297)</btitle><stitle>PLASMA</stitle><date>1999</date><risdate>1999</risdate><spage>270</spage><pages>270-</pages><issn>0730-9244</issn><eissn>2576-7208</eissn><isbn>9780780352247</isbn><isbn>0780352246</isbn><abstract>Summary form only given. One of the major problems in high voltage/current and long pulse e-beam generation is plasma diode closure. LaB/sub 6/, thermionic cathodes can eliminate plasma and are more robust from poisoning than oxide cathodes. To heat the LaB/sub 6/ disk on the MELBA cathode stalk at -1 MV we employ a 100-650 W CW Nd:YAG laser. Depending upon the LaB/sub 6/ disk diameter (1 cm or 2.2 cm), temperature, and cathode shape, preliminary analysis of experiments suggests three e-beam modes: 1) Thermionic mode at electron beam current density of 100-150 A/cm/sup 2/, with current shape which matches the voltage flatness, 2) Plasma mode in which 2-6 kA of current is drawn with rapid current ramping, and 3) Combined thermionic and plasma mode with initial thermionic current turn-on which is later overtaken by plasma current. It is believed that the plasma modes may involve explosive edge emission or outgassing from a graphite cathode mounting structure.</abstract><pub>IEEE</pub><doi>10.1109/PLASMA.1999.829611</doi></addata></record> |
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| identifier | ISSN: 0730-9244 |
| ispartof | IEEE Conference Record - Abstracts. 1999 IEEE International Conference on Plasma Science. 26th IEEE International Conference (Cat. No.99CH36297), 1999, p.270 |
| issn | 0730-9244 2576-7208 |
| language | eng |
| recordid | cdi_ieee_primary_829611 |
| source | IEEE Electronic Library (IEL) Conference Proceedings |
| subjects | Cathodes Diodes Laser modes Optical pulse generation Plasma density Plasma temperature Robustness Shape Temperature dependence Voltage |
| title | Laser heated LaB/sub 6/ thermionic cathode on a MV electron beam accelerator |
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