DISCLAIMER This report was prepared as an account of worit sponsored by an agency of the United States Government. Neither the United State; Government not any agency thtreof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or rtiponsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that ijs use would not infringe privately owned rights. Refer ence herein to any

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... ific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise tlocs not necessarily constitute or imply its endorsement, recom mendation, or favoring by the United Stales Government or any agency thereof The views and opinions of authors expressed herein do not necessarily state or reded those of the United States Government or any agency thereof. <IASltt 'IS!STRI3tJTi(M OF THIS DOCUMENT IS IK-ILIfiilTEQ <^0 IAEA-CN-U7/A-I-3 TFTR PLASMA REGIMES ABSTRACT i Significant extensions in the TFTR plasma operating regimes have been achieved with additional heating-system capability, installation of a multishot pellet injector, and the development of an enhanced confinement regime. In ohmi^ally heated pelletfueled discharges characterized by highly peaked density profiles, enhancements in tp have resulted in n e (0)x E (a)-values of 1.5 x 10 m"^s. In neutral-beam-h.ated discharges, an operating regime has been developed in which substantial improvements in energy confinement time and neutron source strength ?re observed. Ion temperatures of -20 keV and n^OHgfajTjJoj-values of 2' x 10 20 m"^s keV have been achieved. This enhanced confinement regime is characterized by high values of 3 and low values of collisionality. The observed surface voltage, which is negative during beam injection, is compared with models including beamdriven and bootstrap currents. » Dr. Ton Mual, Academy Bibliographic, HONG KONG