Particle balance on HT-7: Error analysis and first results

This paper introduces the utilization and first results of particle balance analysis on HT-7 deuterium retention study. Based on the present measuring system, at the end of a long pulse discharge, more than 90% of the puffed D2 molecules remains inside the vacuum vessel. In the following dozens of seconds, about 30% of the puffed D2 appears as outgassing and is extracted. The permanent D retention is at the level of 60%. More retention happens in longer pulse. Pumping speed is not a decisive factor for D2 retention control.