Nuclear fusion

This interview is part of a series conducted during research for the book Tunnel Visions, a history of the Superconducting Super Collider project. It mainly addresses parts of Sir Christopher Llewellyn Smith’s career prior to his time as CERN Director-General, a position he held from 1994 to 1999, focusing on international perspectives surrounding the proposal and construction of large collider facilities. It covers his service as the scientific advisor to the 1984 Kendrew inquiry, which assessed UK membership in CERN, and to another inquiry, led by Anatole Abragam, which assessed CERN’s management. The interview extensively covers CERN’s preparations to build what became the Large Hadron Collider (LHC) in the tunnel where the Large Electron-Positron (LEP) collider was built, and how those preparations were influenced by the U.S. move to build the SSC and, later, by the SSC’s declining political fortunes and termination. Llewellyn Smith offers his perspectives on whether it would have been politically feasible in the 1980s to build a “world accelerator,” as well as on Japanese perceptions of U.S. plans for the SSC and the prospect that the U.S. could have secured contributions to the project from Japan. He also discusses early cost estimates for the LHC and their role in efforts to secure support for building it. The interview concludes with discussions of how CERN, the SSC, and the ITER fusion facility project were organized, and of the distinct roles of major facility directors and project managers.

Interview with Alvin Trivelpiece, American physicist who served as Director of the Office of Energy Research in the United States Department of Energy from 1981-1987. Trivelpiece provides an overview of his graduate studies at Caltech and his background in plasma physics. He discusses in detail his involvement in the beginnings of the SSC (Superconducting Super Collider), including cost estimations, funding requests, site selection, and attempts to secure international collaboration. Trivelpiece shares stories involving many key players who were supporters of the SSC, as well as some who were opposed. He also touches on the creation of other DOE projects such as Fermilab and CEBAF (Thomas Jefferson National Accelerator Facility).

This wide-ranging interview explores the career of Jim Decker, most of which has been at the U.S. Department of Energy and its predecessor agencies. Decker first worked in the fusion energy program, and from 1985 to 2007 he was Principal Deputy Director of the DOE Office of Energy Research, which was renamed the Office of Science in 1998. The position was the highest-level career position within the office. The interview covers the evolving fortunes of fusion research in the U.S., including expanding support in the 1970s, U.S. participation in the international ITER project, and deep funding cuts in the 1990s. The leadership of Al Trivelpiece at the office, the development of DOE’s high-performance computing efforts, and the management of the Superconducting Super Collider project are discussed in some detail. Other subjects include the origins of DOE’s support for the Human Genome Project, the development of DOE’s procedures for oversight of major projects, recent trends toward funding “centers” and special initiatives, the evolving status of the Office of Science within DOE, and Decker’s experiences with Congress and successive presidential administrations.

In this interview, Brandon Sorbom, Chief Science Officer at Commonwealth Fusion Systems, discusses the development of his company and interest in nuclear fusion. Sorbom speaks about his time as an undergraduate student at Loyola Marymount University where he majored in Electrical Engineering and Physics and how he discovered his interest in fusion during this time. He describes how his interest in nuclear fusion led him to pursue graduate school at MIT. He details his time as a graduate student working at the MIT Plasma Science and Fusion Center, as well as his experience working with his advisor Dennis Whyte. Sorbom discusses how he first became involved in the development of SPARC, whose goal is to generate net energy from fusion, during his time at MIT. He details the variety of investors for his company and the roles he and his cofounders take on within CSF. Sorbom explains CSF’s current project of demonstrating that superconducting magnets at high fields can be used in fusion. Lastly, Sorbom discusses how fusion energy will likely become the dominant form of energy in the future and how it can help combat climate change.

Interview with Kenneth Lande, professor emeritus in the Department of Physics at the University of Pennsylvania. Lande recounts his early childhood in Austria and his family’s escape to New York City from the Nazis has a young boy. Lande describes his interest in science, which he developed during his time at Brooklyn Tech, which he pursued as an undergraduate at Columbia. He describes working on bubble chambers under the direction of Leon Lederman at Nevis Lab in Westchester, and why he gave no consideration to graduate schools other than Columbia. Lande discusses his research at Brookhaven and he describes the major projects of the early 1950s including the Cosmotron and Lederman’s cloud chamber. He describes his thesis research on K mesons and explains that he accepted a job offer at the University of Pennsylvania before he defended his dissertation. Lande describes Penn’s and Princeton’s joint effort to become competitive in accelerator physics, and he explains his growing involvement in neutrino physics and work at Los Alamos in the 1960s. He explains the need to work underground when studying neutrino events caused by cosmic rays, and he describes his involvement with the Homestake mine collaboration. Lande describes his research involving gallium at the Baksan Observatory in the Soviet Union, the importance of the Kamiokande experiment, and he provides a history of neutrino physics that connects Darwin to Hans Bethe. He compares his research at Brookhaven, Fermilab, and Los Alamos, and he explains why he discourages undergraduates from memorizing anything as a way to encourage critical thinking. At the end of the interview Lande reflects on how collaborations have grown enormously over the course of his career, and looking ahead, he sees his contributions to neutrino research as prelude to something much bigger and fundamental for future discovery.

Interview with William Herrmannsfeldt, Staff Physicist at SLAC. Herrmannsfeldt recounts his German heritage, his upbringing in Ohio, and his early interests in physics which he pursued as an undergraduate at Miami University. He discusses his graduate work on beta decay and nuclear physics at the University of Illinois, under the direction of James Allen, and he describes his postdoctoral appointment at Los Alamos where he made detectors for bomb tests. Herrmannsfeldt explains the connection between his work at Los Alamos on electron optics and his initial research at SLAC, and he describes his work on linear accelerators. He describes his tenure as Secretary of the Advanced Development Group and his role at the AEC to concentrate on accelerator physics for Fermilab. Herrmannsfeldt explains the decision to move ahead with the PEP project and his LINAC work at Berkeley. Herrmannsfeldt explains the relevance of this research to nuclear fusion, and he describes some of the technical challenges in building the superconducting RF system. At the end of the interview, Herrmannsfeldt conveys the sense of fun he felt in learning new technological systems, the inherent challenges of beam dynamics, and he reflects on how SLAC has changed since its inception.