Determination of Hohlraum Fields using Monoenergetic Proton and Deuteron Radiography

An understanding of hohlraum physics is critical to the continued development of indirect-drive ICF. In hohlraums, self-generated electromagnetic fields play an important role in determining plasma dynamics and evolution; however, details about the magnitude and structure of these fields, and whether electric or magnetic fields are dominant, remain unclear. To explore these questions, we conducted experiments at the OMEGA laser facility using tri-particle (DT³He) monoenergetic proton and deuteron radiography to probe laser-driven vacuum-filled gold and plastic (CH) hohlraums. Deflection field reconstruction techniques were utilized to recover proton deflection information, and methods were developed for using either a single radiograph, or multiple radiographs, to recover information about the structure and strength of both electric and magnetic fields simultaneously. This work was supported in part by the U.S. DOE, NLUF, and LLE.