{"id":2439,"date":"2007-05-01T20:34:55","date_gmt":"2007-05-01T20:34:55","guid":{"rendered":"http:\/\/casgroups.case.edu\/physics-senior-projects\/?p=2439"},"modified":"2016-06-20T13:55:08","modified_gmt":"2016-06-20T13:55:08","slug":"characterizing-electron-background-with-the-cdms-beta-cage-a-predecessor-to-a-screener-of-ultra-low-level-radiation-the-prototype-beta-cage","status":"publish","type":"post","link":"https:\/\/casgroups.case.edu\/physics-senior-projects\/characterizing-electron-background-with-the-cdms-beta-cage-a-predecessor-to-a-screener-of-ultra-low-level-radiation-the-prototype-beta-cage\/","title":{"rendered":"Characterizing Electron Background with the CDMS Beta Cage &#8211; A Predecessor to a Screener of Ultra-Low-Level Radiation: the Prototype Beta Cage"},"content":{"rendered":"<h3 style=\"text-align: center\">Kristin Poinar with Richard Schnee<\/h3>\n<h3 style=\"text-align: center\"><a href=\"\/physics-senior-projects\/files\/2007\/05\/KristinPoinarPOSTER.ppt\">Characterizing Electron Background with the CDMS Beta Cage &#8211; A Predecessor to a Screener of Ultra-Low-Level Radiation: the Prototype Beta Cage<\/a><\/h3>\n<p>The beta cage is a proposed multi-wire proportional chamber that will be the most sensitive device available to screen low-energy (200 keV or less) betas emitted at very low rates (down to $10^{-5}$ counts\/keV\/$cm^{2}$\/day).\u00a0 Shielding and radiopure components will allow this sensitivity to be achieved in the full-size beta cage, which will be used to assess beta-emitting impurities on the surface of detectors for use in the Cryogenic Dark Matter Search.\u00a0 These impurities currently limit the experiment&#8217;s sensitivity to the dark matter candidate WIMPs.<\/p>\n<p>The project consists of the construction and commissioning of a smaller, prototype chamber.\u00a0 The prototype beta cage will enclose a 40x40x20 cm drift region and two horizontal multi-wire proportional counters, all contained within a vessel of argon gas.\u00a0 Samples will be placed beneath the bottom grid; emitted betas will ionize the gas atoms and produce a shower of secondary electrons, which the high-voltage anode wires of each grid will multiply and collect.\u00a0 Their readouts will allow discrimination of events from background and determination of the energy of each beta event.\u00a0 The use of the prototype chamber will assess the accuracy of isotope identification by reconstructing the beta energy spectrum.\u00a0<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Kristin Poinar with Richard Schnee<a href=\"\/physics-senior-projects\/files\/2007\/05\/KristinPoinarPOSTER.ppt\">Characterizing Electron Background with the CDMS Beta Cage &#8211; A Predecessor to a Screener of Ultra-Low-Level Radiation: the Prototype Beta Cage<\/a><\/p>\n<p>The beta cage is a proposed multi-wire proportional chamber that will be the most sensitive device available to screen low-energy (200 keV or less) betas emitted at very low rates (down to $10^{-5}$ counts\/keV\/$cm^{2}$\/day).\u00a0 Shielding and radiopure components will allow this sensitivity to be achieved in the full-size beta cage, which will be used to assess beta-emitting impurities on the surface of detectors for use in the Cryogenic Dark Matter Search.\u00a0<\/p>\n<p><a href=\"https:\/\/casgroups.case.edu\/physics-senior-projects\/characterizing-electron-background-with-the-cdms-beta-cage-a-predecessor-to-a-screener-of-ultra-low-level-radiation-the-prototype-beta-cage\/\" class=\"more-link\">Continue reading&#8230; <span class=\"screen-reader-text\">Characterizing Electron Background with the CDMS Beta Cage &#8211; A Predecessor to a Screener of Ultra-Low-Level Radiation: the Prototype Beta Cage<\/span><\/a><\/p>\n","protected":false},"author":19,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"spay_email":""},"categories":[83,41],"tags":[],"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/casgroups.case.edu\/physics-senior-projects\/wp-json\/wp\/v2\/posts\/2439"}],"collection":[{"href":"https:\/\/casgroups.case.edu\/physics-senior-projects\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/casgroups.case.edu\/physics-senior-projects\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/casgroups.case.edu\/physics-senior-projects\/wp-json\/wp\/v2\/users\/19"}],"replies":[{"embeddable":true,"href":"https:\/\/casgroups.case.edu\/physics-senior-projects\/wp-json\/wp\/v2\/comments?post=2439"}],"version-history":[{"count":2,"href":"https:\/\/casgroups.case.edu\/physics-senior-projects\/wp-json\/wp\/v2\/posts\/2439\/revisions"}],"predecessor-version":[{"id":2649,"href":"https:\/\/casgroups.case.edu\/physics-senior-projects\/wp-json\/wp\/v2\/posts\/2439\/revisions\/2649"}],"wp:attachment":[{"href":"https:\/\/casgroups.case.edu\/physics-senior-projects\/wp-json\/wp\/v2\/media?parent=2439"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/casgroups.case.edu\/physics-senior-projects\/wp-json\/wp\/v2\/categories?post=2439"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/casgroups.case.edu\/physics-senior-projects\/wp-json\/wp\/v2\/tags?post=2439"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}