Foreword: Special issue featuring papers from the 25th Topical Meeting on the Technology of Fusion Energy (TOFE 2022)

We are delighted to bring you this Fusion Science and Technology (FST) special issue featuring papers derived from the 25th Technology of Fusion Energy topical meeting (TOFE 2022). TOFE 2022 was organized as an embedded topical in the American Nuclear Society Annual Meeting and conducted June 12–16, 2022, with in-person attendance in Anaheim, California, at the Anaheim Hilton. The FST editors appreciate the tireless efforts of the TOFE 2022 organizers to manage all the intricate conference processes. The dedication and commitment of the conference general chair (Dr. Ales Necas) and technical program chair (Dr. Paul Humrickhouse) contributed to a smooth and enjoyable experience for the conference attendees. TOFE 2022 attracted worldwide specialists in fusion technology whose efforts may make possible, in the not-too-distant future, the harnessing of energy from thermonuclear reactions. Meeting highlights included the executive plenary session moderated by Dr. Scott Hsu, the U.S. Department of Energy (DOE) lead fusion coordinator. Above all, the TOFE 2022 participants experienced joyful face-to-face communications and networking, which were sorely missed, as the previous TOFE was held online only in 2020 because of the COVID-19 pandemic. Attendees were happy to connect with other professionals in the field and learn about the latest advancements and research in fusion technology. This special issue of FST presents 27 peer-reviewed articles including 24 research articles and 3 student papers showcasing cutting-edge fusion technology. The issue’s contents span the breadth of the topics at TOFE 2022 across five subjects: 1. Neutronics of fusion devices with assessment of their safety and environmental impacts.