University of Toronto Tritium Laboratory for fusion research

Low-energy tritium ion erosion of graphite

“…In addition, a scavenger getter was operated in the target chamber to keep the tritium pressure low enough for stable operation of the quadrupole mass spectrometer (QMS). The vacuum system is similar to the one described in more detail by Haasz and Youle [10]. The base pressure in the vacuum system was <10 À7 Pa after a 24 h bakeout at 400 K. The target chamber walls were then conditioned for 24 h in 10 À2 Pa of H 2 , in the presence of a hot tungsten filament, which created a flux of H atoms, leading to reductions of background H 2 O and hydrocarbons.…”

“…Tritium measurements are more difficult and more expensive to make because of the radioactive nature of tritium: safety and regulatory considerations place significant restrictions on experimental procedures and the available tritium supply (10 Ci = 1 mg = 370 GBq). The University of Toronto Tritium Laboratory [10] is an ultra-high vacuum facility equipped with a mass-analyzed low-energy ion gun suitable for T + -impact erosion measurements.…”