Does the U.S. have a Flagship Tokamak Facility?

Summary Haiku Tokamak goes down Flagship facility, too Feelings hurt out West Magnetic fusion has grabbed quite a few headlines in the past week as news about the failure of the NSTX-U tokamak spreads through the media. One thing that caught my eye is that multiple stories, all written by different authors, all describe the NSTX-U as…

SULI Student Highlighted by DOE

I serve as a mentor in the undergraduate research program at DIII-D and one of my students from 2015 was shown as a highlight by the Department of Energy (DOE)! The highlight is from a DOE presentation dated February 19, 2016, but I only recently found it. The presentation is an overview of the multiple…

Ion Cyclotron Emission in the Presence of Beam Ion Losses

I recently participated in the European Physical Society’s 43rd Conference on Plasma Physics where I gave an oral presentation concerning ion cyclotron emission in tokamaks. Besides having the cool abbreviation of ICE, ion cyclotron emission is interesting because it might be something that can be measured in ITER to provide an indication of the confinement of energetic ions.…

Curriculum Vitae

David C. Pace Research Scientist at the DIII-D National Fusion Facility General Atomics San Diego, California, USA Education      Honors and Awards      Professional Activities      Research Experience Teaching Experience      Publications and Presentations      Co-author Publications Education University of California, Los Angeles, USA Ph.D., Experimental Plasma Physics, 2009 M.Sc., Physics 2003 Committee Co-chairs: G.J. Morales…

Gamma Ray Imager on the DIII-D Tokamak

This is a technical paper concerning the design and commissioning of a gamma ray camera on the DIII-D tokamak. The diagnostic, the Gamma Ray Imager (GRI), is a pinhole camera constructed of lead. This diagnostic is being used to study the behavior of relativistic electron beams in magnetically confined fusion plasmas. Gamma rays can be…

Physics Today October 2015 issue cover

Keeping Fusion Plasmas Hot

The following article first appeared as David C. Pace, William W. Heidbrink, and Michael A. Van Zeeland, “Keeping Fusion Plasmas Hot,” Physics Today 68, 34 (2015). In the article, we discuss interactions between high energy ions and electromagnetic waves in magnetically confined plasmas. These plasmas are produced in nuclear fusion reactors known as tokamaks. My research…

circuit diagram of Langmuir probe setup

Example of Langmuir Probe Analysis

Sections Processing the Raw Data Determining Electron Temperature and Plasma Potential Calculating Electron Density An Additional Concern for Temperature Analysis Sample Data for Practice This is a simple example of Langmuir probe analysis and the issues related to it. It is intended to serve as a helpful reminder of the technical details in analyzing the…