{"id":5597,"date":"2023-11-02T14:01:20","date_gmt":"2023-11-02T05:01:20","guid":{"rendered":"https:\/\/kekacclserver.kek.jp\/accl\/eng\/?page_id=5597"},"modified":"2024-08-09T16:07:16","modified_gmt":"2024-08-09T07:07:16","slug":"kek-electron-positron-linear-accelerator","status":"publish","type":"page","link":"https:\/\/kekacclserver.kek.jp\/accl\/eng\/fa_accl-en\/kek-electron-positron-linear-accelerator","title":{"rendered":"KEK electron-positron linear accelerator"},"content":{"rendered":"<p>It is a multi-purpose linear accelerator (Linac) for supplying electron and positron beams to two rings of the KEKB collider and two light source rings PF\/PF-AR simultaneously. Even one more ring, a positron damping ring, will be added soon for SuperKEKB. Linac is a high-energy linear accelerator with the total length 600 m and the maximum energy 10 billion electron volts 10GeV.<\/p>\n<p><strong>Purpose and Vision<\/strong><br \/>\nThe two rings of KEKB collided 3.5 GeV positrons and 8 GeV electrons to each other at its interaction point. The light sources PF and PF-AR need 2.5 GeV and 3.5 GeV electrons for injection, respectively. These beams with different charge, energy, and intensity are switched pulse-by-pulse at 50 Hz to perform top-up injection to each ring. Thus the beam currents in these rings are kept nearly constant during the experiment. By April 2009, the top-up injection was successfully performed for KEKB and PF, and PF-AR will join around 2016 with a new direct injection beam transport line.<\/p>\n<p>SuperKEKB, which is under construction, requires significant upgrade of the Linac. While the beam energies will be changed to 4\/7 GeV for positrons\/electrons, the quality of the beams must be fairly high, which means small emittances with high bunch intensity. A new positron damping ring at 1.1 GeV will be also inserted in the middle of Linac. The beam performance will be achieved by a number of state-of-art technologies such as an innovative RF gun, positron target, special accelerating structures, precise control of the RF and the beam, etc.<\/p>\n<p><strong>Relates WEB sites<\/strong><br \/>\n<a href=\"https:\/\/www-linac.kek.jp\/\" rel=\"noopener\" target=\"_blank\">Linac<\/a><br \/>\n<a href=\"kekb-ring\">KEKB Ring<\/a><br \/>\n<a href=\"https:\/\/www-superkekb.kek.jp\/\" rel=\"noopener\" target=\"_blank\">KEKB accelerator for researchers<\/a><\/p>\n<p><strong>Associated research groups<\/strong><br \/>\n(The particle detector installed in the KEKB) <a href=\"https:\/\/belle2.jp\/\" rel=\"noopener\" target=\"_blank\">Belle experiment<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>&#46;&#46;&#46;<\/p>\n","protected":false},"author":1,"featured_media":5717,"parent":5595,"menu_order":1,"comment_status":"closed","ping_status":"closed","template":"page-templates\/child-menu.php","meta":{"_coblocks_attr":"","_coblocks_dimensions":"","_coblocks_responsive_height":"","_coblocks_accordion_ie_support":"","_uag_custom_page_level_css":"","footnotes":"","_links_to":"","_links_to_target":""},"class_list":["post-5597","page","type-page","status-publish","has-post-thumbnail","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - 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