This paper summarizes a recent numerical analysis of water vapor and volatile condensible material deposition on the James Webb Space Telescope from the initial orbit insertion up to 180 days post launch. The analysis utilized 17 distinct geometry files capturing observatory configuration changes during the deployment. Surface temperature was set from a time-dependent thermal analysis solution. A vapor pressure model was used to calculate the net water ice adsorption. Molecular contamination included a contribution from UV photopolymerization. The analysis predicted levels of ice and molecular accumulation were found to be within the allowable limits specified by the observatory contamination control plan.
This paper discusses recent model improvements and performance optimization implemented in the Contamination Transport Simulation Program (CTSP). We start by discussing modification of the storage octree to utilize the space-filling Morton Z curve. We then discuss several enhancements to the input file format, such as the ability to utilize mathematical expressions and to combine several short steady-state solutions to cover a longer physical time frame. An HTML-based GUI is described. We then introduce a new molecular model based on materials- specific activation energy and the ability to use partial pressure curves to control material adhesion. Subcycling for particulate motion and a new model for particle surface adhesion are also covered. The paper finishes with a brief discussion of an ongoing experimental test campaign.
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