{"id":5638,"date":"2023-11-02T17:00:12","date_gmt":"2023-11-02T08:00:12","guid":{"rendered":"https:\/\/kekacclserver.kek.jp\/accl\/eng\/?page_id=5638"},"modified":"2024-08-09T16:10:02","modified_gmt":"2024-08-09T07:10:02","slug":"kekbring-en-2","status":"publish","type":"page","link":"https:\/\/kekacclserver.kek.jp\/accl\/eng\/fa_accl-en\/kekbring-en-2","title":{"rendered":"[Research] KEKB Ring"},"content":{"rendered":"<p><strong>KEKB accelerator<\/strong><\/p>\n<p><strong>Purpose and Vision<\/strong><br \/>\nKEKB is an electron-positron collider aimed at experimental verification of the Kobayashi-Maskawa theory of CP-violation. It has achieved the world-highest luminosity, 2.1 x 10<sup>34<\/sup>cm<sup>-2<\/sup>s<sup>-1<\/sup> and brought 2008 Nobel Prize in Physics to Kobayashi and Maskawa.<\/p>\n<p><strong>Summary<\/strong><br \/>\nKEKB is a double-ring electron-positron collider with asymmetric energies. It collides 3.5 GeV positrons and 8 GeV electrons at the interaction point, where the beams are focused to a very small beam sizes around 150 \u03bcm x 1 \u03bcm (horizontal x vertical). Very high currents, 1.7 A \/ 1.4 A, are stored in the postron \/ electron rings, and maintained nearly constant by a top-up injection from the Linac during the collision experiment.<\/p>\n<p>KEKB started its operation in 1998, and reached its design luminosity, 1 x 10<sup>34<\/sup>cm<sup>-2<\/sup>s<sup>-1<\/sup> in 2003, as the first machine to break the world-historical order. A number of new technologies were developed to achieve the luminosity, such as Accelerator Resonant Storage damped RF cavity (ARES), a superconducting damped cavity, a radiation\/background-free interaction region with a large crossing angle, horizontal 2.5\u03c0 lattice with non-interleaved sextupoles, a local chromaticity correction system, bunch-by-bunch feedback system, electron-cloud suppressing solenoids, low-impedance movable collimators, worlds\u2019 largest EPICS accelerator control system, etc. Even a challenging device Crab Cavity was introduced in 2007 hoping a further boost in the luminosity.<\/p>\n<p>KEKB concluded its operation in June 2010 to start the upgrade for SuperKEKB.<\/p>\n<p><strong>Related facilities<\/strong><br \/>\n<a href=\"kekb-ring\">KEKB Ring<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>&#46;&#46;&#46;<\/p>\n","protected":false},"author":1,"featured_media":5717,"parent":5595,"menu_order":7,"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-5638","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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