A Solvent Cleaning Process for the Outer Surface of Plastic ICF Capsules

AbstractBecause isolated contaminants on an inertial confinement fusion (ICF) ablator capsule can lead to undesirable instabilities during implosion, it is critical to remove particles from the surface of plastic capsules prior to target assembly. Current National Ignition Facility (NIF) specifications require that the capsule surface contain no particles larger than 30 μm3. We have developed a solvent-based cleaning process in which a combination of wetting and hydrodynamic forces is used to dislodge, entrain, and remove particles from the surface of plastic NIF ICF ablators. The process was conceptualized by considering the adhesive force acting between particles and a surface, the hydrodynamic force acting on particles near a surface, and the effect of solvent on these forces. We also performed experiments that showed that, in addition to utilizing the appropriate solvent and hydrodynamic force, the dwell time and surface coverage of the impinging solvent stream govern particle removal efficiency. The ...