{"id":1780,"date":"2023-09-17T20:32:10","date_gmt":"2023-09-17T12:32:10","guid":{"rendered":"https:\/\/www.bihec.com\/kimballphysics\/?p=1780"},"modified":"2023-09-17T20:32:10","modified_gmt":"2023-09-17T12:32:10","slug":"kimball-lanthanum-hexaboride-cathode-with-guard-ring-%e5%b8%a6%e9%98%b2%e6%8a%a4%e7%8e%af%e7%9a%84%e5%85%ad%e7%a1%bc%e5%8c%96%e9%95%a7%e9%98%b4%e6%9e%81","status":"publish","type":"post","link":"https:\/\/www.bihec.com\/kimballphysics\/kimball-lanthanum-hexaboride-cathode-with-guard-ring-%e5%b8%a6%e9%98%b2%e6%8a%a4%e7%8e%af%e7%9a%84%e5%85%ad%e7%a1%bc%e5%8c%96%e9%95%a7%e9%98%b4%e6%9e%81\/","title":{"rendered":"Kimball Lanthanum Hexaboride Cathode with Guard Ring \u5e26\u9632\u62a4\u73af\u7684\u516d\u787c\u5316\u9567\u9634\u6781"},"content":{"rendered":"<p>Kimball Lanthanum Hexaboride Cathode with Guard Ring <a href=\"https:\/\/www.bihec.com\/kimballphysics\/tag\/%e5%b8%a6%e9%98%b2%e6%8a%a4%e7%8e%af%e7%9a%84%e5%85%ad%e7%a1%bc%e5%8c%96%e9%95%a7%e9%98%b4%e6%9e%81\/\" title=\"View all posts in \u5e26\u9632\u62a4\u73af\u7684\u516d\u787c\u5316\u9567\u9634\u6781\" target=\"_blank\">\u5e26\u9632\u62a4\u73af\u7684\u516d\u787c\u5316\u9567\u9634\u6781<\/a><\/p>\n<h2>Description<\/h2>\n<p>The <a href=\"https:\/\/www.bihec.com\/kimballphysics\/tag\/kimball-physics\/\" title=\"View all posts in Kimball Physics\" target=\"_blank\">Kimball Physics<\/a> ES-423GR Guard Ring Lanthanum Hexaboride (LaB<sub>6<\/sub>) Cathode is a high performance, resistively heated, thermionic electron source. It is currently employed in many brightness-limited electron optical systems: SEM\u2019s, TEM\u2019s, probes, electron lithography systems, and more.<\/p>\n<p>Kimball Physics ES-423GR\u9632\u62a4\u73af<a href=\"https:\/\/www.bihec.com\/kimballphysics\/tag\/%e5%85%ad%e7%a1%bc%e5%8c%96%e9%95%a7\/\" title=\"View all posts in \u516d\u787c\u5316\u9567\" target=\"_blank\">\u516d\u787c\u5316\u9567<\/a>\uff08LaB6\uff09<a href=\"https:\/\/www.bihec.com\/kimballphysics\/tag\/%e9%98%b4%e6%9e%81\/\" title=\"View all posts in \u9634\u6781\" target=\"_blank\">\u9634\u6781<\/a>\u662f\u4e00\u79cd\u9ad8\u6027\u80fd\u3001\u7535\u963b\u52a0\u70ed\u7684\u70ed\u79bb\u5b50\u7535\u5b50\u6e90\u3002\u76ee\u524d\uff0c\u5b83\u88ab\u7528\u4e8e\u8bb8\u591a\u4eae\u5ea6\u53d7\u9650\u7684\u7535\u5b50\u5149\u5b66\u7cfb\u7edf\uff1aSEM\u3001TEM\u3001\u63a2\u9488\u3001\u7535\u5b50\u5149\u523b\u7cfb\u7edf\u7b49\u3002<\/p>\n<p>The design of the crystal geometry is similar to the conical shape with a microflat tip found in the LaB6 ES-423E design. However, this\u00a0<em>advanced design optimizes emission from the microflat region and suppresses emission from the inclined conical surface by utilizing the additional guard ring structure<\/em>\u00a0without requiring elevated electric fields from the Wehnelt\/grid.<\/p>\n<p>\u6676\u4f53\u51e0\u4f55\u5f62\u72b6\u7684\u8bbe\u8ba1\u7c7b\u4f3c\u4e8eLaB6 ES-423E\u8bbe\u8ba1\u4e2d\u7684\u5177\u6709\u5fae\u5e73\u9762\u5c16\u7aef\u7684\u9525\u5f62\u3002\u7136\u800c\uff0c\u8fd9\u79cd\u5148\u8fdb\u7684\u8bbe\u8ba1\u4f18\u5316\u4e86\u6765\u81ea\u5fae\u5e73\u9762\u533a\u57df\u7684\u53d1\u5c04\uff0c\u5e76\u901a\u8fc7\u5229\u7528\u989d\u5916\u7684\u4fdd\u62a4\u73af\u7ed3\u6784\u6291\u5236\u4e86\u6765\u81ea\u503e\u659c\u9525\u5f62\u8868\u9762\u7684\u53d1\u5c04\uff0c\u800c\u4e0d\u9700\u8981\u6765\u81eaWehnelt\/\u6805\u6781\u7684\u5347\u9ad8\u7684\u7535\u573a<\/p>\n<p>The exposed emitter surface can range from 10 \u00b5m to 250 \u00b5m diameter, with a standard diameter of 25 \u00b5m. The single crystal LaB<sub>6<\/sub>\u00a0&lt;100&gt; orientation, is mounted on the end of a single-piece, stress-free carbon heater rod, and is held in place by a carbon ferrule. The additional guard ring aperture structure controls the exposure of the LaB<sub>6<\/sub>\u00a0surface.<\/p>\n<p>\u66b4\u9732\u7684\u53d1\u5c04\u6781\u8868\u9762\u76f4\u5f84\u8303\u56f4\u4ece10\u00b5m\u5230250\u00b5m\uff0c\u6807\u51c6\u76f4\u5f84\u4e3a25\u00b5m\u3002\u5355\u6676LaB6&lt;100&gt;\u53d6\u5411\uff0c\u5b89\u88c5\u5728\u5355\u7247\u65e0\u5e94\u529b\u78b3\u52a0\u70ed\u68d2\u7684\u672b\u7aef\uff0c\u5e76\u7531\u78b3\u5957\u5708\u56fa\u5b9a\u5230\u4f4d\u3002\u9644\u52a0\u7684\u4fdd\u62a4\u73af\u5b54\u5f84\u7ed3\u6784\u63a7\u5236LaB6\u8868\u9762\u7684\u66dd\u5149\u3002<\/p>\n<p>The model ES-423GR is available in custom configurations with the LaB<sub>6<\/sub>\u00a0crystal cut at a cone angle of 60\u00ba or 90\u00ba and with a microflat size range from 10 \u00b5m to 250 \u00b5m. The LaB<sub>6<\/sub>\u00a0cathode is available mounted on a standard <a href=\"https:\/\/www.bihec.com\/kimballphysics\/tag\/aei\/\" title=\"View all posts in AEI\" target=\"_blank\">AEI<\/a> base, a Kimball Physics <a href=\"https:\/\/www.bihec.com\/kimballphysics\/tag\/cb-104\/\" title=\"View all posts in CB-104\" target=\"_blank\">CB-104<\/a> ceramic base or on a variety of custom bases for particular systems.<\/p>\n<p>ES-423GR\u578b\u53f7\u6709\u5b9a\u5236\u914d\u7f6e\uff0cLaB6\u6676\u4f53\u4ee560\u00ba\u621690\u00ba\u7684\u9525\u89d2\u5207\u5272\uff0c\u5fae\u5e73\u9762\u5c3a\u5bf8\u8303\u56f4\u4ece10\u00b5m\u5230250\u00b5m\u3002<a href=\"https:\/\/www.bihec.com\/kimballphysics\/tag\/lab6%e9%98%b4%e6%9e%81\/\" title=\"View all posts in LaB6\u9634\u6781\" target=\"_blank\">LaB6\u9634\u6781<\/a>\u53ef\u5b89\u88c5\u5728\u6807\u51c6AEI\u5e95\u5ea7\u3001Kimball Physics CB-104\u9676\u74f7\u5e95\u5ea7\u6216\u7528\u4e8e\u7279\u5b9a\u7cfb\u7edf\u7684\u5404\u79cd\u5b9a\u5236\u5e95\u5ea7\u4e0a\u3002<\/p>\n<p><strong>Applications:<\/strong><\/p>\n<ul>\n<li>Scanning Electron Microscopes<\/li>\n<li>Transmission Electron Microscopes<\/li>\n<li>Electron Lithography Systems<\/li>\n<li>Electron Accelerators<\/li>\n<li>X-ray Sources<\/li>\n<li>Custom Applications\u5e94\u7528\u7a0b\u5e8f\uff1a\n<p>\u626b\u63cf\u7535\u5b50\u663e\u5fae\u955c<\/p>\n<p>\u900f\u5c04\u7535\u5b50\u663e\u5fae\u955c<\/p>\n<p>\u7535\u5b50\u5149\u523b\u7cfb\u7edf<\/p>\n<p>\u7535\u5b50\u52a0\u901f\u5668<\/p>\n<p>X\u5c04\u7ebf\u6e90<\/p>\n<p>\u81ea\u5b9a\u4e49\u5e94\u7528\u7a0b\u5e8f<\/li>\n<\/ul>\n<p><strong>Features \/ Options:<\/strong><\/p>\n<ul>\n<li><strong>Guard Ring Design<\/strong>\u00a0with optimized emission from the microflat surface<\/li>\n<li><strong>Extended Lifetime<\/strong>\n<ul>\n<li>Thousands of functional hours in<br \/>\nclean vacuum<\/li>\n<li>Guaranteed Against Structural<br \/>\nMounting Failure<\/li>\n<\/ul>\n<\/li>\n<li><strong>Exceptional Stability<\/strong>\n<ul>\n<li>Precision machined carbon mounting<\/li>\n<li>High over-temperature tolerance<\/li>\n<\/ul>\n<\/li>\n<li><strong>High Brightness \/ Low Energy Spread<\/strong>\n<ul>\n<li>&lt;100&gt; Oriented Single Crystal<\/li>\n<li>Best Quality \/ High Purity Material<\/li>\n<li>Emission current densities up to 30 A\/cm2<\/li>\n<li>Operating pressure &lt; 10-7\u00a0torr<\/li>\n<\/ul>\n<\/li>\n<li><strong>Accurate Microflats<\/strong>\n<ul>\n<li>Superior Optics<\/li>\n<li>Controlled Source Size<\/li>\n<li>Standard Diameters Available<\/li>\n<li>Range of emission surface sizes<\/li>\n<li>Custom sizes available<\/li>\n<\/ul>\n<\/li>\n<li>On AEI base, compact CB-104 base or request custom mounting<\/li>\n<\/ul>\n<p>\u529f\u80fd\/\u9009\u9879\uff1a<\/p>\n<p>\u5fae\u5e73\u9762\u53d1\u5c04\u4f18\u5316\u7684\u9632\u62a4\u73af\u8bbe\u8ba1<\/p>\n<p>\u5ef6\u957f\u4f7f\u7528\u5bff\u547d<\/p>\n<p>\u6570\u5343\u4e2a\u5de5\u4f5c\u5c0f\u65f6<\/p>\n<p>\u6e05\u6d01\u771f\u7a7a<\/p>\n<p>\u4fdd\u8bc1\u4e0d\u53d7\u7ed3\u6784\u5f71\u54cd<\/p>\n<p>\u5b89\u88c5\u6545\u969c<\/p>\n<p>\u5353\u8d8a\u7684\u7a33\u5b9a\u6027<\/p>\n<p>\u7cbe\u5bc6\u52a0\u5de5\u78b3\u652f\u5ea7<\/p>\n<p>\u9ad8\u6e29\u8010\u53d7\u6027<\/p>\n<p>\u9ad8\u4eae\u5ea6\/\u4f4e\u80fd\u91cf\u6269\u6563<\/p>\n<p>&lt;100&gt;\u5b9a\u5411\u5355\u6676<\/p>\n<p>\u6700\u4f73\u8d28\u91cf\/\u9ad8\u7eaf\u5ea6\u6750\u6599<\/p>\n<p>\u53d1\u5c04\u7535\u6d41\u5bc6\u5ea6\u9ad8\u8fbe30 A\/cm2<\/p>\n<p>\u5de5\u4f5c\u538b\u529b&lt;10-7\u6258<\/p>\n<p>\u7cbe\u786e\u7684\u5fae\u5e73\u53f0<\/p>\n<p>\u5353\u8d8a\u7684\u5149\u5b66\u6027\u80fd<\/p>\n<p>\u53d7\u63a7\u6e90\u5927\u5c0f<\/p>\n<p>\u63d0\u4f9b\u6807\u51c6\u76f4\u5f84<\/p>\n<p>\u53d1\u5c04\u8868\u9762\u5c3a\u5bf8\u8303\u56f4<\/p>\n<p>\u63d0\u4f9b\u81ea\u5b9a\u4e49\u5c3a\u5bf8<\/p>\n<p>\u5728AEI\u5e95\u5ea7\u4e0a\uff0c\u7d27\u51d1\u578bCB-104\u5e95\u5ea7\u6216\u8981\u6c42\u5b9a\u5236\u5b89\u88c5<\/p>\n<p id=\"PnObvUM\"><img loading=\"lazy\" class=\"alignnone  wp-image-1781 \" src=\"https:\/\/www.bihec.com\/kimballphysics\/wp-content\/uploads\/sites\/10\/2023\/09\/img_6506f090a4451.png\" alt=\"\" width=\"412\" height=\"248\" srcset=\"https:\/\/www.bihec.com\/kimballphysics\/wp-content\/uploads\/sites\/10\/2023\/09\/img_6506f090a4451.png?v=1694953618 1154w, https:\/\/www.bihec.com\/kimballphysics\/wp-content\/uploads\/sites\/10\/2023\/09\/img_6506f090a4451-300x180.png?v=1694953618 300w, https:\/\/www.bihec.com\/kimballphysics\/wp-content\/uploads\/sites\/10\/2023\/09\/img_6506f090a4451-1024x616.png?v=1694953618 1024w, https:\/\/www.bihec.com\/kimballphysics\/wp-content\/uploads\/sites\/10\/2023\/09\/img_6506f090a4451-768x462.png?v=1694953618 768w, https:\/\/www.bihec.com\/kimballphysics\/wp-content\/uploads\/sites\/10\/2023\/09\/img_6506f090a4451-500x301.png?v=1694953618 500w, https:\/\/www.bihec.com\/kimballphysics\/wp-content\/uploads\/sites\/10\/2023\/09\/img_6506f090a4451-800x481.png?v=1694953618 800w\" sizes=\"(max-width: 412px) 100vw, 412px\" \/> <img loading=\"lazy\" class=\"alignnone  wp-image-1782 \" src=\"https:\/\/www.bihec.com\/kimballphysics\/wp-content\/uploads\/sites\/10\/2023\/09\/img_6506f0b0a6b31.png\" alt=\"\" width=\"434\" height=\"320\" srcset=\"https:\/\/www.bihec.com\/kimballphysics\/wp-content\/uploads\/sites\/10\/2023\/09\/img_6506f0b0a6b31.png?v=1694953648 564w, https:\/\/www.bihec.com\/kimballphysics\/wp-content\/uploads\/sites\/10\/2023\/09\/img_6506f0b0a6b31-300x221.png?v=1694953648 300w, https:\/\/www.bihec.com\/kimballphysics\/wp-content\/uploads\/sites\/10\/2023\/09\/img_6506f0b0a6b31-500x369.png?v=1694953648 500w\" sizes=\"(max-width: 434px) 100vw, 434px\" \/><\/p>\n<p>&nbsp;<\/p>\n<p id=\"uESClXn\"><img loading=\"lazy\" class=\"alignnone  wp-image-1783 \" src=\"https:\/\/www.bihec.com\/kimballphysics\/wp-content\/uploads\/sites\/10\/2023\/09\/img_6506f0cf01bc5.png\" alt=\"\" width=\"411\" height=\"303\" srcset=\"https:\/\/www.bihec.com\/kimballphysics\/wp-content\/uploads\/sites\/10\/2023\/09\/img_6506f0cf01bc5.png?v=1694953679 564w, https:\/\/www.bihec.com\/kimballphysics\/wp-content\/uploads\/sites\/10\/2023\/09\/img_6506f0cf01bc5-300x221.png?v=1694953679 300w, https:\/\/www.bihec.com\/kimballphysics\/wp-content\/uploads\/sites\/10\/2023\/09\/img_6506f0cf01bc5-500x369.png?v=1694953679 500w\" sizes=\"(max-width: 411px) 100vw, 411px\" \/> <img loading=\"lazy\" class=\"alignnone  wp-image-1784 \" src=\"https:\/\/www.bihec.com\/kimballphysics\/wp-content\/uploads\/sites\/10\/2023\/09\/img_6506f0dd4d48c.png\" alt=\"\" width=\"384\" height=\"283\" srcset=\"https:\/\/www.bihec.com\/kimballphysics\/wp-content\/uploads\/sites\/10\/2023\/09\/img_6506f0dd4d48c.png?v=1694953693 564w, https:\/\/www.bihec.com\/kimballphysics\/wp-content\/uploads\/sites\/10\/2023\/09\/img_6506f0dd4d48c-300x221.png?v=1694953693 300w, https:\/\/www.bihec.com\/kimballphysics\/wp-content\/uploads\/sites\/10\/2023\/09\/img_6506f0dd4d48c-500x369.png?v=1694953693 500w\" sizes=\"(max-width: 384px) 100vw, 384px\" \/><\/p>\n<br><div class=\"tagcloud\"><a href=\"https:\/\/www.bihec.com\/kimballphysics\/tag\/%e5%b8%a6%e9%98%b2%e6%8a%a4%e7%8e%af%e7%9a%84%e5%85%ad%e7%a1%bc%e5%8c%96%e9%95%a7%e9%98%b4%e6%9e%81\/\" class=\"tag-cloud-link tag-link-0 tag-link-position-1\" style=\"font-size: 8pt;\" 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