All posts by Spinlab

Laboratory for the Optical Manipulation & Detection of Nuclei

The Great Bipolar High Voltage Power Supply Installation of 2017

What is a bipolar power supply and why do we need it? In the Ra EDM experiment, a high electric field flips sign on a roughly 1-minute cycle. The direction of the field is changed by reversing the sign, or polarity, of the voltage being applied across the “hot” cathode (field is defined by positive-to-negative charge direction). ...

Letter of recommendation from Albert Einstein for Konrad Wachsmann, 2 October 1939

The Time-Consuming Privilege of Writing a Thoughtful Letter of Recommendation for a Student

Inspiration It will soon be application season (at least for students considering going to grad school in physics) for graduating seniors. As a consequence, I’ve decided to borrow some useful guidelines from my colleagues regarding letters of recommendation/reference: Ed Brown’s Letters of Recommendation Pawel Danielewicz’s Recommendation Letters Brian O’Shea’s Recommendation letters Shriram Krishnamurthi’s Advice to ...

Producing Scientific Diagrams Which Reveal the Relevant Scale @EdwardTufte

Learning how to produce informative and detailed graphical representations of the equipment used for experiments is a critical skill that takes practice and requires detailed knowledge of what is truly important about each component of the apparatus. For the Single Atom Microscope (SAM) project, we designed and assembled a prototype gas handling system (GHS) which ...

Farewell Andy & Courtney! (2017 MSU REU Poster Session)

  Andy and Courtney have completed their REUs with the group this summer and presented their results at the REU poster session. Andy developed a machine vision system for characterizing the HV electrodes used for the Ra EDM experiment. This optical method is high resolution (10 microns), high precision (repeatable), real time (can be performed ...

FRIB Day 1 Science Workshop: Fundamental Symmetries

Today I will present a talk with Jon Engel on FRIB Day 1 Science Opportunities for Fundamental Symmetries. This talk is part of a workshop that is a satellite meeting of the 2017 (US) Low Energy (Nuclear Physics) Community Meeting which is being hosted by Physics Division at Argonne National Lab. The main thrust of the talk ...

Calibrated Spatial Profile Measurements of Extended Light Sources

The purpose of SAM is to image individual atoms that fluoresce upon excitation with a light source that we choose based upon the properties of those atoms. In the past, we’ve made the simplifying assumption that the spatial profile of a light source is uniform, but, for real extended light sources, this is not true. ...

Claude Shannon’s 1952 Lecture on Creative Thinking

A lecture by Claude Shannon on Creative Thinking is buried deep inside of his Miscellaneous Writings edited by N. J. A. Sloane & Aaron D. Wyner in 1990. It has been rediscovered in some sense by the authors Jimmy Soni & Rob Goodman who have just recently published a biography of Shannon. One of the ...