Methodology and Application of High Performance Electrostatic Field Simulation in the KATRIN Experiment

The Karlsruhe Tritium Neutrino (KATRIN) experiment is a tritium beta decay experiment designed to make a direct, model independent measurement of the electron neutrino mass. The experimental apparatus employs strong (O[T]) magnetostatic and (O[105 V/m]) electrostatic fields in regions of ultra high (O[10-11 mbar]) vacuum in order to obtain precise measurements of the electron energy spectrum near the endpoint of tritium beta-decay. The electrostatic fields in KATRIN are formed by multiscale electrode geometries, necessitating the development of high performance field simulation software. To this end, we present a Boundary Element Method (BEM) with analytic boundary integral terms in conjunction with the Robin Hood linear algebraic solver, a nonstationary successive subspace correction (SSC) method. We describe an implementation of these techniques for high performance computing environments in the software KEMField, along with the geometry modeling and discretization software KGeoBag. We detail the application of KEMField and KGeoBag to KATRIN's spectrometer and detector sections, and demonstrate its use in furthering several of KATRIN's scientific goals. Finally, we present the results of a measurement designed to probe the electrostatic profile of KATRIN's main spectrometer in comparison to simulated results.Doctor of Philosoph

Tools for electromagnetic field simulation in the KATRIN experiment

Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Physics, 2009.Cataloged from PDF version of thesis.Includes bibliographical references (p. 130-135).The Karlsruhe Tritium Neutrino (KATRIN) experiment is a tritium beta decay experiment designed to make a direct, model independent measurement of the electron neutrino mass. To accomplish this task, the experiment employs precisely defined electric and magnetic fields for particle transport and mass spectroscopy. In order to simulate particle trajectories in the experiment, it is essential to have methods for calculating these fields quickly and accurately. The application of the methods of direct elliptic integral calculation, zonal harmonic expansion and interpolation from an adaptive-refinement field mesh is described within the object-oriented KatrinField framework, as well as an analysis of their comparative strengths and weaknesses in reproducing the electromagnetic fields found in KATRIN.by Thomas Joseph Corona.S.M

The Grizzly, December 5, 2019

Ursinus Cancels Swimming Seasons After Hazing Investigation • Students Detail Harassment on Main Street • Summer Internship Tips with CPD • Get to Know: Spring Break Service Trip • Opinion: Ursinus\u27 Judicial System is Broken • Q&A with Senior Linebacker Jake McCain • Women\u27s Basketball Walk-on Proves She is More Than Just a Ballerhttps://digitalcommons.ursinus.edu/grizzlynews/1597/thumbnail.jp

The Grizzly, December 6, 2018

Snapchat Story Leads to School Enforcement of Discriminatory Acts Policy • What\u27s in Store for Martin Luther King, Jr. Week • Ursinus Celebrated the Fifth Annual #Giving2UCday on Campus • Student Employee Profiles: Facilities • The Curtain Club and how Theatre Evolved at Ursinus • Opinions: It\u27s Time to Retire the War on Christmas ; Let Students Spend Dining Dollars Off-Campus • Athlete Spotlight: Junior Quarterback Tom Garlick • Eric Williams Jr. Knocks Down 1,000th Career Point for UC Men\u27s Basketballhttps://digitalcommons.ursinus.edu/grizzlynews/1610/thumbnail.jp

The Grizzly, November 1, 2018

Midterm Elections November 6 • IDC Opening Honors Past President Fong, Celebrates Campus Milestone • Deadline for The Lantern is Here • Board of Trustees Comes to Campus • Geology Professors go Under the IDC • Meet the Charles Rice Post-Graduate Research Fellows • Opinions: Kavanaugh and the Powers of the Supreme Court; Is the New UC Tour Guide Dress Code Sexist? • Women\u27s Swimming Begins Title Defense with Back-to-Back Dual Meet Wins • Senior Bridget Sherry Nominated for NFHCA Senior Game as Field Hockey Preps for Post-Seasonhttps://digitalcommons.ursinus.edu/grizzlynews/1606/thumbnail.jp

Engineered optical nonlinearity for a quantum light source

Single-photon pairs created in the nonlinear process of spontaneous parametric downconversion form the backbone of fundamental and applied experimental quantum information science. Many applications benefit from careful spectral shaping of the single-photon wave-packets. In this paper we tailor the joint spectral wave-function of downconverted photons by modulating the nonlinearity of a poled crystal without affecting the phase-matching conditions. We designed a crystal with a Gaussian nonlinearity profile and confirmed successful wave-packet shaping by two-photon interference experiments. We numerically show how our method can be applied for attaining one of the currently most important goals of single-photon quantum optics, the creation of pure single photons without spectral correlations.Comment: 7 pages (4 pages + appendices), 5 figures. Minor formatting changes. Fixed typos. Some additional reference

The Grizzly, November 15, 2018

Mythbuster: Student Writer Takes on Medusa and Marginalization • Voter Registration Status Causes Issues for Student Voters on Election Day • Members of the Ursinus Community Gather to Remember Victims of the Tree of Life Shooting • What do UC Political Clubs Think About the Recent Elections? • Why Myrin is Full of Government Documents • Opinions: Choosing Classes Needs to be Less Confusing; We Need to Better Recognize World War I Veterans • Fall Sports Seniors Complete Final Seasons • McDaid Makes Ursinus Cross Country History • Q&A with Mike Moronesehttps://digitalcommons.ursinus.edu/grizzlynews/1608/thumbnail.jp

Estimación del balance hídrico en una cuenca semiárida, El Mogor, Baja California, México

El trabajo de investigación se efectuó en la subcuenca El Mogor en el Valle de Guadalupe (VG) en Baja California, México. Se realizó una caracterización integral, con el objetivo de hacer una cuantificación del aporte hidrogeológico de la subcuenca hacia el valle en el año hidrológico 2010-2011. Esta región presenta un clima semiárido y se realizan actividades agrícolas de gran importancia, donde sobresale la viticultura. Como parte de la caracterización, se estableció la conductividad hidráulica no saturada utilizando la ecuación de Kozeny-Carman (KC). Se llevó a cabo el cálculo de la evapotranspiración potencial (ETP) utilizando el método de Thornthwaite (Thw), el cual se comparó con la evaporación potencial (EP) estimada con la charola de Penman (CHP) y con la ETP calculada por la estación del CICESE (CIC), cuyo programa utiliza la ecuación de Penman-Monteith para su cálculo. Se estimó un balance hídrico (Almorox, 2003) utilizando el resultado obtenido de la ETP de Thw y los datos de precipitación (P), con los que se obtuvo una infiltración potencial (I) generalizada en la subcuenca de ~974 000 m3 y un escurrimiento (Es) de ~86 000 m3 . Asimismo, se calculó de forma directa el escurrimiento superficial mediante el uso de un vertedor triangular de pared delgada con el que se estimó un volumen de ~60 000 m3 . Finalmente, mediante fórmulas empíricas, se calculó una recarga (vertical, de sistema montañoso, horizontal y por percolación por agua de riego) de ~466 000 m3 , que fue equivalente al 7% de la precipitación infiltrable en el año hidrológico en estudio