Tangential compact torus injection into STOR-M

Summary form only given, as follows. The University of Saskatchewan Compact Torus Injector (USCTI) has been designed, fabricated and installed for injection experiments on the STOR-M tokamak (R=0.46 m, a=0.12 m, B/sub t/<1T, I/sub p/<50 kA, n~/sub e/=(0.5-2)/spl times/10/sup 13/ cm/sup -3/). In USCTI, compact toroids (CTs) with densities in cm the range of 10/sup 15/ cm/sup -3/ are formed and accelerated to velocities exceeding 120 km/sec. The total mass of CT can be controlled by fast formation and acceleration discharges and by careful adjustment of the through-put of fast-acting gas valves. For injection into STOR-M, CT mass of approximately 1 /spl mu/g is normally employed. The injector is installed on STOR-M with tangential injection configuration. Following the CT injection, the plasma density starts to increase immediately from 1/spl times/10/sup 13/ cm/sup -3/ to a peak value of 2/spl times/10/sup 13/ cm/sup -3/ within 3 msec. The plasma moves outward as the result of the increase in the poloidal /spl beta/ value. The H/sub /spl alpha// radiation level decreases, as observed previously during the biasing and short current pulse induced ohmic H-mode in STOR-M. Also, the loop voltage decreases, which is probably the signature of current drive and/or plasma heating due to momentum and/or energy transfer from energetic CT plasmoid to tokamak discharge.