From rhparker@uchicago.edu Thu Nov 20 17:32:30 2008 Date: Thu, 20 Nov 2008 17:32:22 -0600 (CST) From: rhparker@uchicago.edu To: Henry J. Frisch Subject: Re: Abstracts due Nov 21 [ The following text is in the "UTF-8" character set. ] [ Your display is set for the "ISO-8859-1" character set. ] [ Some characters may be displayed incorrectly. ] Richard Parker Project: Nuclear EDM/DAVLL 11-20-08 Advisor: Zheng-Tian Lu This experiment investigates time-reversal symmetry. Since we cannot actually reverse time, a good way to study time reversal symmetry is to find something that, if it exists, would be guaranteed to violate T-symmetry. A good candidate is the nuclear EDM. Radium-225 is used for its relatively long lifetime and its spin of ˝. Radium atoms will be trapped and cooled by laser, then submitted to a constant B field and randomly alternating E field. The B field will create a spin precession˙˙if the precession frequency changes measurably with the alternating E field, that means Radium has an EDM. In order to assure that a change in frequency is not due to an unstable B field, Rubidium atoms are subjected to the same B field (but not the E field), and their precession frequencies are concurrently measured. My project is to implement a DAVLL (Dichroic-Atomic-Vapor Laser Lock) system, which will provide the experiment with a laser of sufficiently stable frequency to use for the analysis of the precession frequency. The DAVLL system (developed by Prof. Lu) uses a negative feedback loop to maintain a stable frequency, by using Zeeman-shifted transitions in a weak magnetic field to ˙˙lock on˙˙ to the desired resonance frequency. My primary goal is to implement this system, and my secondary goal is to properly shield the system so that the magnetic fields required do not interfere with the very careful measurement of precession frequency that must occur nearby. By accomplishing there goals I hope to learn laboratory procedure, to become familiar with the relevant equipment (diode lasers, optics, and servo electronics), and learn some ˙˙practical˙˙ atomic physics. ---- Original message ---- >Date: Fri, 14 Nov 2008 13:56:47 -0600 (CST) >From: "Henry J. Frisch" >Subject: Abstracts due Nov 21 >To: bclouser@uchicago.edu, charlotte coles , christopherw@uchicago.edu, cjmeyer@uchicago.edu, cstevens@uchicago.edu, David Reid at , ejo@uchicago.edu, fields@uchicago.edu, kcrum@uchicago.edu, kstory@uchicago.edu, liuh@uchicago.edu, melachrinos@uchicago.edu, Nobuko McNeill , Nobuko McNeill , pgratia@uchicago.edu, pkanjano@uchicago.edu, pscherpelz@uchicago.edu, rhparker@uchicago.edu, tankut@uchicago.edu, tnatoli@uchicago.edu, wangjy965@uchicago.edu, wyntonmoore@uchicago.edu > >Dear P335, > Would you please email me the title of your project, a 1-paragraph >abstract, the name of your advisor, and a short list of what you hope to >achieve in this project, all by Friday Nov.21. > Thanks a lot, > Henry > >-- >Henry J. Frisch >HEP 320, EFI >5640 S. Ellis Ave. >Chicago, Il. 60637 >Phone:773-702-7479 >Fax:773-834-5959 > Richard Haywood Parker University of Chicago Graduate Student, Physics 919-614-3381