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We are working together to build the world’s most sophisticated particle detector for analyzing collisions between electrons and protons or other nuclei. The data we collect will give us insight into the dynamic interactions of the smallest internal building blocks of visible matter, quarks and gluons, and help us understand the underlying laws that govern the strongest force in nature.</p> </div> <div class="grid_12 omega"> <p>In the process of building and eventually using this detector to do groundbreaking science, we’ll be developing new technologies and training the next generation of nuclear scientists and high-tech workers that help drive our modern society. </p> <p>The ePIC detector will be built with funding from the U.S. Department of Energy’s Office of Science, Office of Nuclear Physics, with key contributions from international partners.</p> </div> </div> </div> </div> <div class="contentArea bandTwo"> <div class="container_24"> <div class="grid_18 prefix_2 suffix_4"> <h2>Detector details</h2> <p>Modern particle physics detectors are complicated, highly integrated experiments that operate at the edge of the possible. The ePIC experiment will be an approximately 10-meter long cylindrical barrel detector with additional instrumentation that extends to up to 45m in each direction down the EIC beamline. It will use cutting-edge technologies to detect particles created in collisions between high energy electrons and protons or heavy ions (the nuclei of larger atoms) moving close to the speed of light. </p> <h3 style="color:#ffff">Features of the central barrel detector</h3> <ul> <li>A 1.7 Tesla superconducting magnet for curving the trajectories of charged particles created in these collisions</li> <li>High-precision silicon detectors for tracking particle trajectories in the magnetic field</li> <li>Precise calorimeters for measuring the energy of electromagnetic particles with exquisite precision</li> <li>A suite of particle identification technologies for determining the quark content of particles over a wide range of energies </li> <li>Dense calorimetric detectors at the outer radius of the cylindrical detector to allow the measurement of “jets”—collimated sprays of particles that arises when a high energy electron scatters off a quark in a proton or ion</li> </ul> </div> <div class="grid_22 prefix_1 suffix_1"> <img class="fwd fwm" style="margin-top:2em" src="images/epic-cutaway-labeled.jpg"/> <p class="caption">Cutaway view of the ePIC detector.</p> <img class="fwd fwm" style="margin-top:2em" src="images/epic-exploded-view.png" /> <p class="caption">Exploded view of the ePIC detector.</p> </div> <div class="grid_18 prefix_2 suffix_4"> <p>Somewhat unique to the EIC, the ePIC detector is highly integrated into the collider beamline. This will allow detection of particles emerging very close to the primary beam—within angles of just a few degrees. This instrumentation consists of silicon detectors built into the EIC beam pipe, and even inside one of the EIC collider magnets, as well as calorimetry for measuring the energy of photons and neutrons that don’t bend in the EIC magnets. These detectors allow us to detect so-called “exclusive” events, where the scattered electron just tickles the inside of the proton it scatters off but otherwise remains intact.</p> </div> <div class="grid_22 prefix_1 suffix_1"> <img class="fwd fwm" style="margin-top:2em;" src="images/epic-schematic-1.jpg" /> <p class="caption">ePIC detector in place in the EIC beamline.</p> </div> <div class="grid_18 prefix_2 suffix_4"> <h2>AI-powered data collection</h2> <div class="grid_12 alpha"> <p>Machine learning (ML) techniques and artificial intelligence (AI) will be key for the data processing and analysis in ePIC. The ePIC detector will take data using a revolutionary streaming data acquisition system without the need for a traditional hardware trigger. AI/ML techniques will “teach” computers to make intelligent decisions about which electron-ion collisions to study to ensure that ePIC captures the data that's relevant to the physics questions scientists want to answer. </p> </div> <div class="grid_12 omega"> <p>ML and AI will be applied at all levels — for example, for calibrating detectors and for reconstructing collision events. This real-time analysis and feedback will enable quick diagnostics and optimization of the detector as well as significantly faster access to physics results.</p> </div> </div> </div> </div> <div class="contentArea bandThree"> <div class="container_24"> <div class="grid_22 prefix_1 suffix_1"> <div class="grid_11 suffix_1 alpha"> <h2>An International Effort</h2> <p>The ePIC collaboration consists of hundreds of scientists and engineers representing 171 institutions from 24 countries. The quest to understand the structure of nuclear matter is truly an international pursuit, engaging the brightest minds in nuclear physics from around the world. </p> <div style="text-align:center;"> <a class="bigButton" target="_new" href="https://wiki.bnl.gov/EPIC/"><span>See the ePIC Wiki</span></a> </div> </div> <div class="grid_6"> <h2>Contacts</h2> <div class="imageContainer"> <img alt="photo of John Lajoie" src="images/lajoie.png"/> </div> <div class="textContainer"> <p class="name"><a target="_new" href="https://www.ornl.gov/staff-profile/john-g-lajoie">John Lajoie</a></p> <p class="jobTitle">ePIC Spokesperson</p> <p class="groupName">Oak Ridge National Lab</p> <p class="contactInfo"><a href="mailto:lajoiejg@ornl.gov">lajoiejg@ornl.gov</a></p> </div> </div> <div class="grid_6"> <h2> </h2> <div class="imageContainer"> <img alt="photo of Silvia Dalla Torre" src="images/dalla-torre.png"/> </div> <div class="textContainer"> <p class="name"><a target="_new" href="https://wwwusers.ts.infn.it/~dallator/SilviaDALLATORRE/">Silvia Dalla Torre</a></p> <p class="jobTitle">ePIC Deputy Spokesperson</p> <p class="groupName">INFN</p> <p class="contactInfo"><a href="mailto:silvia.dallatorre@ts.infn.it">silvia.dallatorre@ts.infn.it</a></p> </div> </div> <img style="margin:3em 0 3em 0;" alt="photo of ePIC collaboration members" class="fwd fwm" src="images/eicug-warsaw-2023.jpg"/> <img alt="world map of contributors" class="fwd fwm" src="images/epic-world-map-2.png"/> <p class="caption" style="color:white;">Countries represented in the ePIC collaboration.</p> </div> </div> </div>  <div class="contentArea themes container_24"> <div class="grid_6"> <a href="goals.php" class="themeBlock matchHeight" data-mh="themes"> <h3>Overview</h3> <p>The Electron-Ion Collider will be a discovery machine for unlocking the secrets of the "glue" that binds the building blocks of visible matter in the universe.</p> </a> </div> <div class="grid_6"> <a href="machine.php" class="themeBlock matchHeight" data-mh="themes"> <h3>The Machine</h3> <p>The Electron-Ion Collider will consist of two intersecting accelerators, one producing an intense beam of electrons, the other a beam of protons or heavier atomic nuclei which are steered into head-on collisions.</p> </a> </div> <div class="grid_6"> <a href="benefits.php" class="themeBlock matchHeight" data-mh="themes"> <h3>Benefits</h3> <p>Beyond sparking scientific discoveries in a new frontier of fundamental physics, the Electron-Ion Collider will trigger technological breakthroughs that have broad-ranging impact on human health and national challenges.</p> </a> </div> <div class="grid_6"> <a href="science.php" class="themeBlock matchHeight" data-mh="themes"> <h3>EIC Science</h3> <p>The unique and powerful tools of the Electron-Ion Collider will cast fresh light on the forces that bind protons and neutrons together to form nuclei.</p> </a> </div> <div class="grid_24"> <p style="text-align:center; margin-top:2em; font-size:1.2em;">Brookhaven National Lab's <a class="gold" href="https://www.bnl.gov/ec">EIC Directorate</a> coordinates with domestic and international partners to deliver the EIC construction project.</p> </div> <div class="clear"></div> <div class="grid_4 topPad" id="topPad1"> <a href="https://www.bnl.gov"><img class="fwm fwd screenOnly" alt="Brookhaven logo" src="/eic/images/logo-bnl.png" /></a> </div> <div class="grid_4 topPad" id="topPad1"> <a href="https://www.jlab.org/" target="_blank" ><img class="fwm fwd screenOnly" alt="Jeferson Lab logo" src="/eic/images/logo-jlab.png" /></a> </div> <div class="grid_4 topPad" id="topPad2"> <a href="https://science.energy.gov/" target="_blank"><img class="fwm fwd screenOnly" alt="Dept. of Energy logo" src="/eic/images/logo-energy.png" /></a> </div> <div class="grid_12 topPad" id="topPad3"> <p class="boilerplate">Brookhaven National Laboratory advances fundamental research in nuclear and particle physics to gain a deeper understanding of matter, energy, space, and time; 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