Results From the Upgraded Porous Plug Injection System for Studies of Hydrocarbon Dissociation and Transport in DIII-D*

Calibrated spectroscopic measurements of dissociation fragments resulting from hydrocarbon influx in a tokamak divertor have been taken with the use of the Mk II Porous Plug Injector (PPI) in DIII-D. The PPI was upgraded to include a small orifice flow restrictor for more precise gas flow control, achieving flow rates corresponding to sputtering yields of 0.5{\%}-2{\%} in attached and detached divertor plasmas. Results and analysis of digital video, and medium and high resolution spectroscopic data collected are presented and compared with those of the Mk I PPI and similar experiments at JET, TEXTOR, and ASDEX.