DOCSLIB.ORG

Development of a Dual-Particle Imaging System for Nonproliferation Applications

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Development of a Dual-Particle Imaging System for Nonproliferation Applications Development of a Dual-Particle Imaging System for Nonproliferation Applications By Alexis Pierre Valère Poitrasson-Rivière A dissertation submitted in partial fulfillement of the requirements for the degree of Doctor of Philosophy (Nuclear Engineering and Radiological Sciences) in the University of Michigan 2016 Doctoral Committee: Professor Sara A. Pozzi, Chair Assistant Professor Marek Flaska, Penn State University Professor Zhong He Associate Professor David D. Wentzloff © Alexis Pierre Valère Poitrasson-Rivière 2016 Dedication This work is dedicated to my rock and my wind. ii Acknowledgements I would first of all like to thank my family and friends for supporting me throughout my doctoral studies. I would also like to thank my advisor, my committee members, the faculty and staff at the Nuclear Engineering & Radiological Sciences department, as well as all the students I had the chance to interact with, for making this experience fulfilling and enjoyable from start to finish. I would finally like to thank the different sponsors that have helped make this work possible. This work is supported, in part, by the U.S. Defense Threat Reduction Agency under Grant No. HDTRA1-09-C-0012, by the National Nuclear Security Administration through NA-22 funding opportunity DE-FOA-0000568, and by the National Science Foundation and the Domestic Nuclear Detection Office of the Department of Homeland Security through the Academic Research Initiative Award #CMMI 0938909. The prototype systems described in this work are funded by the Department of Energy, Nuclear Energy University Program, Award #DE- NE0000324. iii Table of Contents Dedication ...................................................................................................................................... ii Acknowledgements ...................................................................................................................... iii List of Figures ............................................................................................................................... vi List of Tables ................................................................................................................................. x List of Appendices ........................................................................................................................ xi Chapter 1. Introduction ............................................................................................................... 1 1.1. From Nuclear Physics to Nuclear Nonproliferation ............................................................. 1 1.2. Nuclear Nonproliferation ..................................................................................................... 2 1.3. Radiation Imaging ................................................................................................................ 4 1.4. Radiation Imaging in Nuclear Nonproliferation .................................................................. 5 Chapter 2. Compton Imaging – The iFind Project .................................................................... 8 2.1. Premise ................................................................................................................................. 8 2.2. Two-Plane Compton Camera Concept ................................................................................. 9 2.3. Tools and Methodology ..................................................................................................... 11 2.3.1. MCNPX-PoliMi and MPPost ...................................................................................... 11 2.3.2. Terrestrial Background Model .................................................................................... 15 2.3.3. Lanthanum Intrinsic Background Model ..................................................................... 16 2.3.4. Detection of Imageable Events .................................................................................... 17 2.3.5. Backprojection Imaging ............................................................................................... 18 2.4. Results ................................................................................................................................ 20 2.4.1. Scatter-Plane Optimization ......................................................................................... 20 2.4.2. Absorption-Plane Optimization ................................................................................... 23 2.4.3. Minimum Detectable Activity Study ............................................................................. 26 2.4.4. MLEM – Backprojection Comparison ......................................................................... 30 2.4.5. Validation Measurements ............................................................................................ 32 2.5. Advantages and Limitations of Compton Imaging ............................................................ 34 Chapter 3. Neutron Imaging ...................................................................................................... 36 3.1. Premise ............................................................................................................................... 36 3.2. Neutron-Scatter Camera Concept ....................................................................................... 37 3.3. Tools and Methodology ..................................................................................................... 38 3.4. Simulation validation ......................................................................................................... 42 3.4.1. Measurement Setup ...................................................................................................... 43 3.4.2. Results Comparison ..................................................................................................... 44 3.5. Advantages and Limitations of a Neutron-Scatter Camera ................................................ 46 iv Chapter 4. Dual Particle Imaging System ................................................................................ 48 4.1. Premise ............................................................................................................................... 48 4.2. Three-Plane Dual-Particle Imaging Concept ..................................................................... 49 4.3. Data-Acquisition Executable and Real-Time Processing .................................................. 53 4.3.1. Prototype Setup ............................................................................................................ 53 4.3.2. Synchronization Procedure ......................................................................................... 58 4.3.3. System Capabilities ...................................................................................................... 59 4.4. Three-Plane DPI Results .................................................................................................... 61 4.5. Advantages and Limitations of the Three-Plane DPI System ............................................ 66 Chapter 5. Two-Plane DPI System ............................................................................................ 67 5.1. Two-Plane DPI Concept & Optimization .......................................................................... 67 5.1.1. Concept Design ............................................................................................................ 67 5.1.2. Optimization ................................................................................................................ 68 5.2. Results ................................................................................................................................ 74 5.2.1. Efficiency & Field of View ........................................................................................... 74 5.2.2. MOX Measurements .................................................................................................... 78 5.2.3. Angular-Resolution Analysis ....................................................................................... 79 5.2.4. Simulation Validation .................................................................................................. 83 5.2.5. Material Characterization ........................................................................................... 84 5.3. Summary, Advantages, and Limitations of the Two-Plane DPI System ........................... 86 Chapter 6. Summary, Conclusion and Future Improvements ............................................... 89 6.1. Conclusions ........................................................................................................................ 89 6.2. Future Improvements ......................................................................................................... 91 Appendices ................................................................................................................................... 94 References .................................................................................................................................. 147 v List of Figures Fig. 1-1. Evolution of the atom model through the years [1]. ........................................................ 1 Fig. 2-1. Artist rendition of the Compton-camera set-up on the back of a truck. ........................... 9 Fig. 2-2. Principle of source localization with a two-plane
Load more

Recommended publications
  • Neutrons and Fundamental Symmetries Experimental II: Edms Chen-Yu Liu Indiana University [email protected]
    Neutrons and Fundamental Symmetries Experimental II: EDMs Chen-Yu Liu Indiana University [email protected] June 20, 2018 NNPSS 1 Topics I will cover: Lecture 1: beta-decay • A brief history of the electroweak theory---the precursor to the Standard Model. • Neutron decay to test the V-A theory & beyond the SM interactions • Current status with neutron experiments on gA & lifetime • Physics is Symmetries Lecture 2: EDM Q: Why does EDM violate T? • CP violation • Electric Dipole Moments: Highly sensitive low-energy probes of new Physics • muon- g-2 Lecture 3: other symmetry violation measurements/tests • Baryogenesis & symmetry violations • Nnbar oscillation: B violation • Hadronic weak interactions: P violation • NOPTREX: T violation • Neutron interferometry: Lorentz symmetry violation Chen-Yu Liu 2 Mirror (leftright) “Signatures of the Artist,” by S. Vigdor, Oxford University Press(2018) Challenge: Can you find the differences (in three places) between the final and the original picture? Mirror (up down) “Plane-filling motif with reptiles” by M.C. Escher P Blackwhite CP 3 CP T Since time symmetry requires that these time-reversed relative directions be equally probable, it requires that there be no average charge separation along the spin direction, so the EDM must vanish. or If an non-zero EDM is found, then the time reversal symmetry is violated, and through the CPT theorem, the CP is violated by the same amount. 4 Electric Dipole Moment of polar molecules NH3 molecule has two ground states. They are of the same energies (degenerate). Time Reversal J J d d d d J J Electric Dipole Moment of polar molecules NH3 molecule has two ground states.
    [Show full text]
  • Not All Superheroes Were Created Equal
    00 gresh fm i-xii, 1-6 8/13/04 1:54 PM Page i THE SCIENCE OF SUPERVILLAINS Lois H. Gresh Robert Weinberg John Wiley & Sons, Inc. 00 gresh fm i-xii, 1-6 8/13/04 1:54 PM Page ii Copyright © 2005 by Lois H. Gresh and Robert Weinberg. All rights reserved Introduction © Chris Claremont. All rights reserved Published by John Wiley & Sons, Inc., Hoboken, New Jersey Published simultaneously in Canada No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, scanning, or otherwise, except as permitted under Section 107 or 108 of the 1976 United States Copyright Act, without either the prior written permission of the Publisher, or authorization through payment of the appropriate per-copy fee to the Copyright Clearance Center, 222 Rosewood Drive, Danvers, MA 01923, (978) 750-8400, fax (978) 646-8600, or on the web at www.copyright.com. Requests to the Publisher for permission should be addressed to the Permissions Department, John Wiley & Sons, Inc., 111 River Street, Hoboken, NJ 07030, (201) 748-6011, fax (201) 748-6008. Limit of Liability/Disclaimer of Warranty: While the publisher and the author have used their best efforts in preparing this book, they make no representations or warranties with respect to the accuracy or completeness of the contents of this book and specifically disclaim any implied war- ranties of merchantability or fitness for a particular purpose. No warranty may be created or extended by sales representatives or written sales materials.
    [Show full text]
  • AKA Clark Kent) Middle Name Is Joseph
    Superman’s (AKA Clark Kent) Middle Name Is Joseph. What’s that?! There in the sky? Is it a bird? Is it a plane? No! It’s the Man of Tomorrow! Superman has gone by many names over the years, but one thing has remained the same. He has always stood for what’s best about humanity, all of our potential for terrible destructive acts, but also our choice to not act on the level of destruction we could wreak. Superman was first created in 1933 by Joe Shuster and Jerry Siegel, the writer and artist respectively. His first appearance was in Action Comics #1, and that was the beginning of a long and illustrious career for the Man of Steel. In his unmistakable blue suit with red cape, and the stylized red S on his chest, the figure of Superman has become one of the most recognizable in the world. The original Superman character was a bald telepathic villain that was focused on world domination. It was like a mix of Lex Luthor and Professor X. Superman’s powers include incredible strength, the ability to fly. X-ray vision, super speed, invulnerability to most attacks, super hearing, and super breath. He is nearly unstoppable. However, Superman does have one weakness, Kryptonite. When exposed to this radioactive element from his home planet, he becomes weak and helpless. Superman’s alter ego is mild-mannered reporter Clark Kent. He lives in the city of Metropolis and works for the newspaper the Daily Planet. Clark is in love with fellow reporter Lois Lane.
    [Show full text]
  • All Batman References in Teen Titans
    All Batman References In Teen Titans Wingless Judd boo that rubrics breezed ecstatically and swerve slickly. Inconsiderably antirust, Buck sequinedmodernized enough? ruffe and isled personalties. Commie and outlined Bartie civilises: which Winfred is Behind Batman Superman Wonder upon The Flash Teen Titans Green. 7 Reasons Why Teen Titans Go Has Failed Page 7. Use of teen titans in batman all references, rather fitting continuation, red sun gauntlet, and most of breaching high building? With time throw out with Justice League will wrap all if its members and their powers like arrest before. Worlds apart label the bleak portentousness of Batman v. Batman Joker Justice League Wonder whirl Dark Nights Death Metal 7 Justice. 1 Cars 3 Driven to Win 4 Trivia 5 Gallery 6 References 7 External links Jackson Storm is lean sleek. Wait What Happened in his Post-Credits Scene of Teen Titans Go knowing the Movies. Of Batman's television legacy in turn opinion with very due respect to halt late Adam West. To theorize that come show acts as a prequel to Batman The Animated Series. Bonus points for the empire with Wally having all sorts of music-esteembody image. If children put Dick Grayson Jason Todd and Tim Drake in inner room today at their. DUELA DENT duela dent batwoman 0 Duela Dent ideas. Television The 10 Best Batman-Related DC TV Shows Ranked. Say is famous I'm Batman line while he proceeds to make references. Spoilers Ahead for sound you missed in Teen Titans Go. The ones you essential is mainly a reference to Vicki Vale and Selina Kyle Bruce's then-current.
    [Show full text]
  • Simulation of a High Speed Counting System for Sic Neutron
    Transactions of the Korean Nuclear Society Spring Meeting Jeju, Korea, May 7-8, 2015 Preliminary Study for Inventories of Minor Actinides in Thorium Molten Salt Reactor Choong Wie Lee* and Hee Reyoung Kim Ulsan National Institute of Science and Technology, Ulsan 689-798, Republic of Korea *Corresponding author: [email protected] 1. Introduction 2.2 Concept equation for MSR MSR (Molten Salt Reactor) is one of GEN-IV reactor In the MSR, it is continually refueled during operation, types, of which the coolant and the fuel are mixtures of that is, the MSR is refueled online. Therefore, an isotope molten salt. Thus, it has different characteristic with the i in the reactor will be supplied as the rate of Ai. While conventional reactors which use a solid fuel. It can refueled, the wastes such as minor actinides and fission continually supply the fuel by online refueling and products produced after fission reaction are removed reprocessing of minor actinides so that those can be from the inside of the MSR. Chemical reprocessing is separated and eliminated from the reactor. The MSR used to extract minor actinides from salts and transfer maintains steady state except initial stage and the reactor those to the reprocessing unit. By this reprocessing, the becomes stable. In this research, considering online wastes in the reactor are extracted regularly without refueling, bubbling and reprocessing, the basic concept reactor shutdown. It increases the operation stability of for evaluation of the inventory of minor actinide in the the reactor and decreases the generation of the molten salt reactor is driven using the Bateman equation.
    [Show full text]
  • ISIS Neutron and Muon Source Annual Review 2018
    ISIS Neutron and Muon Source Annual Review 2018 The ISIS Neutron and Muon Source Science and Technology Facilities Council, Rutherford Appleton Laboratory, Harwell Oxford, Didcot, Oxfordshire OX11 0QX, UK T: +44 (0)1235 445592 F: +44 (0)1235 445103 E: [email protected] RAL-TR-2018-013 www.isis.stfc.ac.uk Head office, Science and Technology Facilities Council, Polaris House, North Star Avenue, Swindon SN2 1SZ, UK Establishments at: Rutherford Appleton Laboratory, Oxfordshire; Daresbury Laboratory, Cheshire: UK Astronomy Centre, Edinburgh; Chilbolton Observatory, Hampshire: Boulby Underground Science Facility Boulby Mine, Cleveland. ISIS Neutron and Muon Source Annual Review 2018 was produced for the ISIS Facility, STFC Rutherford Appleton Laboratory, Harwell Oxford, Didcot, Oxfordshire, OX11 0QX, UK ISIS Director, Prof Robert McGreevy 01235 445599 User Office 01235 445592 ISIS Facility Web pages http://www.isis.stfc.ac.uk ISIS production team: Andrew Collins, Emma Cooper, Sara Fletcher, Poppy Holford, and Rachel Reeves Design and layout: Andrew Collins and Poppy Holford December 2018 © Science and Technology Facilities Council 2018 This work is licensed under a Creative Commons Attribution 3.0 Unported License. RAL-TR-2018-013 Enquiries about copyright, reproduction and requests for additional copies of this report should be addressed to: RAL Library STFC Rutherford Appleton Laboratory Harwell Oxford Didcot OX11 0QX Tel: +44(0)1235 445384 Fax: +44(0)1235 446403 email: [email protected] Neither the Council nor the Laboratory accept any responsibility for loss or damage arising from the use of information contained in any of their reports or in any communication about their tests or investigations.
    [Show full text]
  • DC Comics Jumpchain CYOA
    DC Comics Jumpchain CYOA CYOA written by [text removed] [text removed] [text removed] cause I didn’t lol The lists of superpowers and weaknesses are taken from the DC Wiki, and have been reproduced here for ease of access. Some entries have been removed, added, or modified to better fit this format. The DC universe is long and storied one, in more ways than one. It’s a universe filled with adventure around every corner, not least among them on Earth, an unassuming but cosmically significant planet out of the way of most space territories. Heroes and villains, from the bottom of the Dark Multiverse to the top of the Monitor Sphere, endlessly struggle for justice, for power, and for control over the fate of the very multiverse itself. You start with 1000 Cape Points (CP). Discounted options are 50% off. Discounts only apply once per purchase. Free options are not mandatory. Continuity === === === === === Continuity doesn't change during your time here, since each continuity has a past and a future unconnected to the Crises. If you're in Post-Crisis you'll blow right through 2011 instead of seeing Flashpoint. This changes if you take the relevant scenarios. You can choose your starting date. Early Golden Age (eGA) Default Start Date: 1939 The original timeline, the one where it all began. Superman can leap tall buildings in a single bound, while other characters like Batman, Dr. Occult, and Sandman have just debuted in their respective cities. This continuity occurred in the late 1930s, and takes place in a single universe.
    [Show full text]
  • Superman Vision
    Superman vision If Superman was looking for a new job, who in this world wouldn’t immediately hire him as a Quality Inspector? The ability with laser precision to see moving parts operate in real time, to slow it down, to enlarge and to probe in 3D with his X-ray vision? Consider the LINX project called “4D Scanning Under Operations”, where the forth “D” denotes time. The ambition is to be able to make high resolution 3D X-ray movies of select manufacturing processes, as they happen: Superman vision. Employing X-ray technology for quality inspection and R&D is nothing new. The project’s two industry partners, Danish insulin leader Novo Nordisk and Swedish packaging giant Tetra Pak already use it. However, available technologies are still lacking in the resolution and speed they can provide. There are severe limitations on the size of the object that can be inspected, and taking samples from the manufacturing line back to the lab is often necessary. None of this is ideal. The issue Time resolved X-ray tomography (4D Superman vision) is expanding for scientifi c applications where it holds great promise. However, the industrial application of these technologies still lacks behind. The speed at which 3D images are generated needs to increase, and the scale limitation which is currently just a few millimeters The Novo insulin pen has several moving parts must be lifted. The size and operability of the inspection and is injection moulded with extreme precision equipment itself must be adapted for industry’s purpose. to comply with regulatory requirements.
    [Show full text]
  • Modeling and Simulation of the Transient Reactor Test Facility Using Modern Neutron Transport Methods by Travis J
    Modeling and Simulation of the Transient Reactor Test Facility using Modern Neutron Transport Methods by Travis J. Labossi`ere-Hickman B.S., University of Tennessee, Knoxville (2016) Submitted to the Department of Nuclear Science & Engineering in partial fulfillment of the requirements for the degree of Master of Science in Nuclear Science & Engineering at the MASSACHUSETTS INSTITUTE OF TECHNOLOGY June 2019 ○c Massachusetts Institute of Technology 2019. All rights reserved. Author................................................................ Department of Nuclear Science & Engineering May 10, 2019 Certified by. Benoit Forget Professor of Nuclear Science & Engineering Thesis Supervisor Certified by. Kord Smith KEPCO Professor of the Practice of Nuclear Science & Engineering Thesis Supervisor Accepted by . Ju Li Battelle Energy Alliance Professor of Nuclear Science & Engineering and Professor of Materials Science & Engineering Chair, Department Committee on Graduate Students 2 Modeling and Simulation of the Transient Reactor Test Facility using Modern Neutron Transport Methods by Travis J. Labossi`ere-Hickman Submitted to the Department of Nuclear Science & Engineering on May 10, 2019, in partial fulfillment of the requirements for the degree of Master of Science in Nuclear Science & Engineering Abstract The Transient Reactor Test Facility (TREAT) has regained the interest of the nuclear engineering community in recent years. While TREAT’s design makes it uniquely suited to transient fuel testing, it also makes the reactor very challenging to model and simulate. In this thesis, we build a Monte Carlo model of TREAT’s Minimum Critical Mass core to examine the effects of fuel impurities, calculate a reference solution, and analyze a number of multigroup cross section generation approaches. Several method of characteristics (MOC) simulations employing these cross sections are then converged in space and angle, corrected for homogenization, and compared to the Monte Carlo reference solution.
    [Show full text]
  • "Superman" by Wesley Strick
    r "SUPERMAN" Screenplay by Wesley Strick Jon Peters Entertainment Director: Tim Burton Warner Bros. Pictures July 7, 1997 y?5^v First Draft The SCREEN is BLACK. FADE IN ON: INT. UNIVERSITY CORRIDOR - LATE NIGHT A YOUNG PROFESSOR hurries down the empty hall — hotly murmuring to himself, intensely concerned ... A handsome man, about 30, but dressed strangely — are we in some other country? Sometime in the past? Or in the future? YOUNG PROFESSOR It's switched off ... It can't be ... But the readings, what else — The Young Professor reaches a massive steel door, like the hatch of a walk-in safe. Slides an ID card, that's emblazoned with a familiar-looking "S" shield: the door hinges open. The Young Professor pauses — he hadn't noted, till now, the depths of his fear. Then, enters: INT. UNIVERSITY LAB - LATE NIGHT Dark. The Professor tries the lights. Power is off. Cursing, he's got just enough time, as the safe door r swings closed again, to find an emergency flashlight. He flicks it on: plays the beam over all the bizarre equipment, the ultra-advanced science paraphernalia. Now he hears a CREAK. He spins. His voice quavers. YOUNG PROFESSOR I.A.C. ..? His flashlight finds a thing: a translucent ball perched atop a corroding pyramid shape. It appears inanimate. YOUNG PROFESSOR (cont'd) Answer me. And finally, from within the ball, a faint alow. Slyly: BALL How can I? You unplugged me, Jor- El ... Remember? Recall? The Young Professor -- JOR-EL -- looks visibly shaken. y*fi^*\ (CONTINUED) CONTINUED: JOR-EL I did what I had to, I.A.C.
    [Show full text]
  • The Dictionary Legend
    THE DICTIONARY The following list is a compilation of words and phrases that have been taken from a variety of sources that are utilized in the research and following of Street Gangs and Security Threat Groups. The information that is contained here is the most accurate and current that is presently available. If you are a recipient of this book, you are asked to review it and comment on its usefulness. If you have something that you feel should be included, please submit it so it may be added to future updates. Please note: the information here is to be used as an aid in the interpretation of Street Gangs and Security Threat Groups communication. Words and meanings change constantly. Compiled by the Woodman State Jail, Security Threat Group Office, and from information obtained from, but not limited to, the following: a) Texas Attorney General conference, October 1999 and 2003 b) Texas Department of Criminal Justice - Security Threat Group Officers c) California Department of Corrections d) Sacramento Intelligence Unit LEGEND: BOLD TYPE: Term or Phrase being used (Parenthesis): Used to show the possible origin of the term Meaning: Possible interpretation of the term PLEASE USE EXTREME CARE AND CAUTION IN THE DISPLAY AND USE OF THIS BOOK. DO NOT LEAVE IT WHERE IT CAN BE LOCATED, ACCESSED OR UTILIZED BY ANY UNAUTHORIZED PERSON. Revised: 25 August 2004 1 TABLE OF CONTENTS A: Pages 3-9 O: Pages 100-104 B: Pages 10-22 P: Pages 104-114 C: Pages 22-40 Q: Pages 114-115 D: Pages 40-46 R: Pages 115-122 E: Pages 46-51 S: Pages 122-136 F: Pages 51-58 T: Pages 136-146 G: Pages 58-64 U: Pages 146-148 H: Pages 64-70 V: Pages 148-150 I: Pages 70-73 W: Pages 150-155 J: Pages 73-76 X: Page 155 K: Pages 76-80 Y: Pages 155-156 L: Pages 80-87 Z: Page 157 M: Pages 87-96 #s: Pages 157-168 N: Pages 96-100 COMMENTS: When this “Dictionary” was first started, it was done primarily as an aid for the Security Threat Group Officers in the Texas Department of Criminal Justice (TDCJ).
    [Show full text]
  • Film & Television Conservatory
    FILM & TELEVISION CONSERVATORY GRADES 9-12 SCHOOL OF FINE & MEDIA ARTS Conservatory Overview Sample Curriculum The Film & Television Conservatory offers students comprehensive training in film Audio Design and television production, editing, screenwriting, sound design, cinematography, Cinematography directing, and producing. Through a rigorous, hands-on curriculum, professionally Directing trained faculty members challenge and mentor students to be their best selves, both Documentary Filmmaking artistically and individually. Students are encouraged to use their work to Editing (Adobe Premiere Pro) demonstrate visual invention and curiosity, collaboration and individual expression, Film History and Criticism solid technical craftsmanship, and captivating storytelling that creates a thoughtful Film Production exploration of the human condition. Students are provided access to a full working Industrial Video Production television studio, a film studio, a Foley stage, digital cameras and equipment, editing Screenwriting suites, and more. The Film & Television Conservatory is both a pre-collegiate Stop Motion Animation cinematic arts school and an industry-prep program, allowing students to discover Television and Live Event Production their own cinematic voices in an innovative and cutting-edge environment. APPLY ONLINE TODAY! www.ocsarts.net/ApplyNow 1010 N. Main Street, Santa Ana, CA 92701 | 714.560.0900 Performance Opportunities Film & Television students screen work each semester at the conservatory’s Cineplex Film Festival in Chapman University’s Folino Theatre, and student work is highlighted each year at the Back-to-School Film Festival and Newport Beach Film Festival. Film & Television students also have the opportunity to participate in OCSA’s Season Finale, a schoolwide event in late spring presented at the prestigious Segerstrom Center for the Arts.
    [Show full text]