The evolution of the density profile in PLT during intense gas puffing is documented and analyzed.Measurements of the spectrum of low energy edge 10 cm/s. These transport coefficients are 10 + 10 times larger than neoclassical. The ion energy confinement is reduced, the small scale density fluctuations are increased, and runaway electrons losses are increased during the density rise.(1) Los alamos National Laboratory CTP.-S Ms-302 Lo» Alamos, NM 87545(2)

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-DISCLAIMER -The design, calibration, and performance of a low energy neutral atom spectrometer are described. Time-of-flight analysis is used to measure the energy spectrum of chargeexchange deuterium atoms emitted from the PLT tokamak plasma in the energy range from 20 to 1000 eV. The neutral c 'tflux is gated on a 1 usee time scale by a slotted rotating chopper disc, supported against gravity in vacuum by magnetic levitation, and is detected by secondary electron emission from a Cu-Be plate. The energy dependent detection efficiency has been measured in particle beam experiments and on the tokamak so that the diagnostic is absolutely calibrated, allowing quantita tive particle fluxes to be determined with 200 Msec time resolu tion. In addition to its present application as a plasma diagnostic, the instrument is capable of making a wide variety of measure ments relevant to atomic and surface physics.