We are constructing and testing a diagnostic instrument to investigate, in detail, ions emanating along magnetic field lines from the plasma region of the TMX-U tandem-mirror experiment. This analyzer (of Tokamak Fusion Test Reactor design) contains parallel electric and magnetic fields, which yield ion mass and energy spatial separation, respectively. A two-dimensional array of 128 copper collector plates detects the particles. The entering ion flux is first well collimated and then focused onto the detector plane during the 180° bending in the magnetic field. This instrument is designed to measure higher particle energies than the present gridded end-loss analyzers as well as determine the energy spectra more accurately. Tandem-mirror plasma parameters to be investigated with this analyzer include end-plug potential, average central-cell-ion energy, and plasma potential in the thermal barrier and nearby regions. We plan a time resolution of up to 2 kHz for each detector.

This article presents an engineering discussion of the role of the hydrated elec tron in a transient dosimetry system. The pertinent rate equations for this system between radiation dose and hydrated elec tron yield. 9 In 1968, N. Klein et al., experimentally determined the solvated electron yield to be on the order of 2.76 ± 0.17 /umoles-liter-kilorad. Klein suggested that this number was constant over a dose range from 0 to 10,000 rads. Thus, assuming the yield to be independ ent of dose rate

Analysis. ' Ionization source 70 e'v electron impact Source temperature > 175°C Gas chromatograph Temperature software controlled Column temperature programmable from RT to 300°C Column temperature slew rate linear 10°C/min or better Low carrier gas flow rates (typically 0.06 laL/min) DP-5 column (100 _m i.d. x 10 m long) Injector Temperature programmable from RT to 300°C Accept liquid injections Programmable split ratio Carrier gas supply Input pressure on the order of 4-5 lb Sufficient supply for two weeks of operation Vacuum requirements Less than 1 x 10-4 Torr during sample analysis Able to handle carrier gas load Data collection system Range 105 Resolution 16 bits Scan speed <1 sec Operator interface Graphics display Keyboard and mouse (or track ball) input devices _J heated ionization source, to reduce condensation of GC peaks and lessen background ion signals. , Because most of the samples generated during the CWC on-site inspections will be solvent extracts, the portable GC-MS instrument must have an injector that will accommodate and vaporize liquid sample injections. To provide and maintain the vapor phase necessary for standard GC analysis, an injector temperatu_'e up to 300°C is desirable. The injector should also be equipped with split-splitless hardware for complex industrial samples that require high-resolution GC separations. A gas chromatograph column that can be temperature-programmed from ambient temperature to a sufficiently elevated temperature is highly desirable for field environmental samples. The column tempera

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Giant pulses have been observed in a ruby ring laser when one of the output beams is reflected directly back into the laser. The threshold for lasing action does not change when the beam is reflected back, but the output is increased to about 1 J with most of the energy in a few pulses of megawatt power level and 50–100 nsec duration.