Dr Jean-Luc Gauvreau (Occidental College)
Using a 10cm-long time projection chamber operating at 40 Torrs, we measured the mobility and diffusion of CS2- ions using pure CS2 and using mixtures where He, Ne, Ar and CF4 were added as a second gas. Measurements were made with electric fields varying from 40 to 600 V/cm. The electron temperature and drift velocity for all those mixtures and fileds were obtained from the code MAGBOLTZ. The CS2- lateral diffusion is consistent with room temperature while the longitudinal diffusion shows a marked increase at the higher fields that could be caused by a long electron attachment mean free path. The obtained longitudinal temperature at lower fields is larger that room temperature. Results will be presented. This analysis will allow us to better understand results obtained with the existing DRIFT detectors. This project is funded by NSF.
Prof. Daniel Snowden-Ifft (Occidental College) Dr Jean-Luc Gauvreau (Occidental College)