{"id":4325,"date":"2024-09-22T16:45:00","date_gmt":"2024-09-22T16:45:00","guid":{"rendered":"https:\/\/workhouse.sweetdishy.com\/?p=4325"},"modified":"2024-09-22T16:45:01","modified_gmt":"2024-09-22T16:45:01","slug":"the-electron-gun","status":"publish","type":"post","link":"https:\/\/workhouse.sweetdishy.com\/index.php\/2024\/09\/22\/the-electron-gun\/","title":{"rendered":"THE ELECTRON GUN"},"content":{"rendered":"\n<p>Our CRTs require a beam of electrons, which we produce using the assembly shown in\u00a0Figure 41. Electrons are stripped off the cathode by a process known as\u00a0<em>glow discharge<\/em>\u00a0between an aluminum cathode rod and a hollow anode. The electron gun is built inside an Ace-Thred #11 connector (Ace catalog number 7644-10). The cathode is a\u00a0<sup>3<\/sup>\/<sub>8<\/sub>-in. aluminum rod sealed against the Ace-Thred #11 connector through an Ace-Thred #11 bushing. The anode electrode is a\u00a0<sup>7<\/sup>\/<sub>16<\/sub>-in. brass tube threaded to accept a\u00a0<sup>1<\/sup>\/<sub>4<\/sub>-in. FIP brass cap. An easy way of making it is from a\u00a0<sup>1<\/sup>\/<sub>4<\/sub>-in. brass nipple turned to reduce its body diameter to\u00a0<sup>7<\/sup>\/<sub>16<\/sub>-in. Electrons exit the gun in a fine beam from a\u00a0<sup>1<\/sup>\/<sub>32<\/sub>-in. hole drilled in the\u00a0<sup>1<\/sup>\/<sub>4<\/sub>-in. FIP anode brass cap. The gun couples to our Ace-Thred #25 tubes through an Ace-Thred #25 bushing. The gun is sealed against the bushing through a Kurt J. Lesker B-075-KM vacuum coupling that we epoxied to a 1-in.-OD \u00d7 2-in.-long stainless steel tube.<\/p>\n\n\n\n<p id=\"fig41\">Figure 41\u00a0The electron gun for our homemade CRT (Figure 40) uses glow discharge between a cathode rod and a hollow anode.\u00a0<strong>(a)<\/strong>\u00a0The electron gun is built inside an Ace-Thred #11 connector\u00a0<strong>(b)<\/strong>\u00a0coupled to an Ace-Thred #25 bushing through a Kurt J. Lesker B-075-KM vacuum coupling epoxied to a 1-in.-OD \u00d7 2-in.-long stainless steel tube.\u00a0<strong>(c)<\/strong>\u00a0We drilled a\u00a0<sup>1<\/sup>\/<sub>32<\/sub>-in. hole in the\u00a0<sup>1<\/sup>\/<sub>4<\/sub>-in. FIP anode brass cap to allow a thin electron beam to exit the gun.<img loading=\"lazy\" decoding=\"async\" width=\"370\" height=\"445\" src=\"https:\/\/learning.oreilly.com\/api\/v2\/epubs\/urn:orm:book:9781118170700\/files\/OEBPS\/images\/61-1.jpg\" alt=\"\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Our CRTs require a beam of electrons, which we produce using the assembly shown in\u00a0Figure 41. Electrons are stripped off the cathode by a process known as\u00a0glow discharge\u00a0between an aluminum cathode rod and a hollow anode. The electron gun is built inside an Ace-Thred #11 connector (Ace catalog number 7644-10). The cathode is a\u00a03\/8-in. aluminum [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":4174,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[513],"tags":[],"class_list":["post-4325","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-atoms-and-radioactivity"],"jetpack_featured_media_url":"https:\/\/workhouse.sweetdishy.com\/wp-content\/uploads\/2024\/09\/atom-2.png","_links":{"self":[{"href":"https:\/\/workhouse.sweetdishy.com\/index.php\/wp-json\/wp\/v2\/posts\/4325","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/workhouse.sweetdishy.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/workhouse.sweetdishy.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/workhouse.sweetdishy.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/workhouse.sweetdishy.com\/index.php\/wp-json\/wp\/v2\/comments?post=4325"}],"version-history":[{"count":1,"href":"https:\/\/workhouse.sweetdishy.com\/index.php\/wp-json\/wp\/v2\/posts\/4325\/revisions"}],"predecessor-version":[{"id":4329,"href":"https:\/\/workhouse.sweetdishy.com\/index.php\/wp-json\/wp\/v2\/posts\/4325\/revisions\/4329"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/workhouse.sweetdishy.com\/index.php\/wp-json\/wp\/v2\/media\/4174"}],"wp:attachment":[{"href":"https:\/\/workhouse.sweetdishy.com\/index.php\/wp-json\/wp\/v2\/media?parent=4325"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/workhouse.sweetdishy.com\/index.php\/wp-json\/wp\/v2\/categories?post=4325"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/workhouse.sweetdishy.com\/index.php\/wp-json\/wp\/v2\/tags?post=4325"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}