Clean-up in TR tubes

Clean-up data taken under controlled conditions applicable to TR tubes are presented for hydrogen in quartz, 7070 glass, copper, nickel, molybdenum, and kovar. The data are related to practical TR discharges where clean-up may take place under several gas-solid conditions. The theoretical and experimental results show that the square-root clean-up rate varies directly with pulse width, pulse repetition rate, and the square root of peak power. A technique is presented for predicting lifetime on the basis of initial measurements. It is also found that the most important form of clean-up for discharges in ammonia and water vapor is that of hydrogen in kovar where the hydrogen is generated by dissociation.