This report presents the design of an undulator beamline at SPring-8 to be used for soft X-ray spectroscopy focused on radioactive materials. Photoemission spectroscopy experiments are carried out in a radioisotope (RI)-controlled area where actinide compounds as well as unsealed radioactive materials are usable. Intrusion of the radioactive materials into the electron storage ring or to the outside of the evacuated beamline components can be avoided by a specially devised RI protection/ inspection mechanism. The combination of a variably polarizing undulator and a varied-line-spacing plane-grating monochromator provides linearly or circularly polarized soft X-rays with a high resolving power in the energy range 0.28-1.5 keV. The beamline will become operational in December 1997.

Experimental investigation of HV short pulsed strcamcr discharges in dry air-fed ozonizers under various operating conditions arc reported. Ozone concentration, energy input and ozone production yield (efficiency) were measured at various voltagcs (14 to 37 kV), pulse repetition rates (25 to 400 pulses per second, pps), flow rales (1.5 to 3.0 llmin) and different gap spacings (10 to 20 mm) at a pressure of 1.01~10~ Pa in dry air. A spiral copper wire (1 m m in diamcler) madc to a cylindrical configuration (18 to 38 m m in diamcter) in a concentric coaxial clcckade system of various dimensions was employcd. A magnetic pulse comprcssor provided the H V and current pulses. Higher voltage and highcr repetition rates yielded higher concentrations of ozane at a fiwcd air flow rate. The present invcstigation was extended to assess the performance of this pulsed ozone generator using dry air under desired conditions of high concentration and high yield of ozone for industrial applications. ' Ucidcustia Corporation, 'lokyo, ]apau On Icavc from Universily of Windsor, Departnicnt of F.1cctrical and Cnnipiitcv h n ineering, Windsor, Ontario, Cauadn, hhnriscript was rcreived 011 11 Jrly 1999, in revisEd b m i a f

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The production of ozone was investigated using a dielectric barrier discharge in oxygen, and employing short-duration pulsed power. The dependence of the ozone concentration (parts per million, ppm) and ozone production yield (g(O3)lkWh) on the peak pulsed voltage (17.5 to 57.9 kV) and the pulse repetition rate (25 to 400 pulsesls, pps) was investigated. In the present study, the following parameters were kept constant: a pressure of 1.01~10~ Pa, a temperature of 26 k 4T, a gas flow rate of 3.0 llmin and a gaseous gap length of 11 mm. A concentric coaxial cylindrical reactor was used. A spiral copper wire (1 mm in diameter) was wound on a polyvinylchloride (PVC) cylindrical configuration (26 mm in diameter) and placed centrally in a concentric coaxial electrode system with 4 mm thick PVC dielectric layer adjacent to a copper outer electrode of 58 mm in internal diameter. HV and current pulses were provided by a magnetic pulse compressor power source.

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