{"id":2439,"date":"2025-07-31T21:10:00","date_gmt":"2025-07-31T13:10:00","guid":{"rendered":"http:\/\/web.tdli.sjtu.edu.cn\/kimsiang84\/?p=2439"},"modified":"2025-11-20T21:29:12","modified_gmt":"2025-11-20T13:29:12","slug":"fast-muon-trigger-system-prototype-readied-for-psis-muedm-experiment","status":"publish","type":"post","link":"https:\/\/web.tdli.sjtu.edu.cn\/kimsiang84\/2025\/07\/31\/fast-muon-trigger-system-prototype-readied-for-psis-muedm-experiment\/","title":{"rendered":"Fast Muon Trigger System Prototype Readied for PSI\u2019s muEDM Experiment"},"content":{"rendered":"\n

Two new studies mark key milestones toward the world\u2019s most sensitive search for the muon electric dipole moment.<\/em><\/p>\n\n\n\n

The PSI muEDM experiment aims to probe physics beyond the Standard Model by improving the sensitivity to the muon\u2019s electric dipole moment (EDM) to 6 \u00d7 10\u207b\u00b2\u00b3 e\u00b7cm\u2014four orders of magnitude beyond the current limit. Detecting a nonzero EDM would reveal new sources of CP violation, offering clues to the Universe\u2019s matter\u2013antimatter imbalance.<\/p>\n\n\n\n

\"\"


Fig. 1 \u2013 schematic of the muEDM setup<\/em><\/figcaption><\/figure>\n\n\n\n

In preparation for the experiment\u2019s Phase I, we have developed and validated a fast muon trigger detector and its front-end electronics, essential for capturing muons entering the storage solenoid and synchronizing the activation of a pulsed magnetic kicker.<\/p>\n\n\n\n

The first step, reported in Radiation Detection Technology and Methods<\/em> (2025)<\/a>, described the design and beam testing of a prototype trigger detector consisting of a 100 \u00b5m-thin gate scintillator and a surrounding telescope array, both read out by silicon photomultipliers (SiPMs). Using 27.5 MeV\/c muons at PSI\u2019s \u03c0E1 beamline, the team measured high timing precision, optimal light yield, and excellent agreement with Geant4 simulations, confirming the system\u2019s ability to select storable muons while rejecting background particles.<\/p>\n\n\n\n

\"\"
Fig. 2 \u2013 the proof-of-concept trigger detector setup.<\/figcaption><\/figure>\n\n\n\n

Building on this foundation, the collaboration developed the fast front-end readout electronics, presented in IEEE Transactions on Nuclear Science<\/em> (2025)<\/a>. The compact system integrates preamplifiers, discriminators, and anti-coincidence logic operating inside a 3 T magnetic field, achieving a total signal latency below 15 ns. During beam tests, the electronics demonstrated sub-6 ns propagation delay and >99 % anti-coincidence efficiency, validating performance under experimental conditions.<\/p>\n\n\n\n

\"\"
Fig. 3 left: Gate detector PCB board; right: Aperture detector PCB board.<\/figcaption><\/figure>\n\n\n\n
\"\"
Fig. 4 left: propagation delay of the fast electronics; right: trigger efficiencies.<\/figcaption><\/figure>\n\n\n\n

With both detector and electronics prototypes now validated, installation and commissioning for Phase I of the muEDM experiment are underway at PSI, bringing researchers a step closer to uncovering new sources of CP violation.<\/p>\n","protected":false},"excerpt":{"rendered":"

Two new studies mark key milestones toward the world\u2019s most sensitive search for the muon electric dipole moment. The PSI […]<\/p>\n","protected":false},"author":3,"featured_media":2441,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[1],"tags":[],"class_list":["post-2439","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/web.tdli.sjtu.edu.cn\/kimsiang84\/wp-json\/wp\/v2\/posts\/2439","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/web.tdli.sjtu.edu.cn\/kimsiang84\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/web.tdli.sjtu.edu.cn\/kimsiang84\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/web.tdli.sjtu.edu.cn\/kimsiang84\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/web.tdli.sjtu.edu.cn\/kimsiang84\/wp-json\/wp\/v2\/comments?post=2439"}],"version-history":[{"count":4,"href":"https:\/\/web.tdli.sjtu.edu.cn\/kimsiang84\/wp-json\/wp\/v2\/posts\/2439\/revisions"}],"predecessor-version":[{"id":2447,"href":"https:\/\/web.tdli.sjtu.edu.cn\/kimsiang84\/wp-json\/wp\/v2\/posts\/2439\/revisions\/2447"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/web.tdli.sjtu.edu.cn\/kimsiang84\/wp-json\/wp\/v2\/media\/2441"}],"wp:attachment":[{"href":"https:\/\/web.tdli.sjtu.edu.cn\/kimsiang84\/wp-json\/wp\/v2\/media?parent=2439"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/web.tdli.sjtu.edu.cn\/kimsiang84\/wp-json\/wp\/v2\/categories?post=2439"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/web.tdli.sjtu.edu.cn\/kimsiang84\/wp-json\/wp\/v2\/tags?post=2439"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}