Fast Electrical and Optical Measurements: Volume I — Current by M. F. Rose, A. K. Hyder, M. Kristiansen (auth.), James E.

By M. F. Rose, A. K. Hyder, M. Kristiansen (auth.), James E. Thompson PhD., Lawrence H. Luessen (eds.)

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2. Electron beam current densities. pulse halfwidths are determined by the short closure time the electrons need to cross the cathode anode gap of the vacuum discharge. A first estimate on the spatial distribution of the electrons extracted through the two gun windows is obtained from simple time integrated photographs of the electron gun output. From these recordings it can qualitatively be concluded that the guns are capable of providing homogeneously distributed electron current densities. It can thus be expected that they are well suited for initiating, dissociating, preionizing or sustaining large volume high pressure discharges for various lasing gases.

12 and 13. Figure 12 is the raw scope trace, and Fig. 13 compares the current from another probe, with the current determined by counting fringes in Fig. 12, and applying a calibration factor of 250 0 jmA. 100 ns/div Fig. 8. Traces recorded during shot when current switched out of the prescribed channel. G. CHANDLER 50 100 n sl d jv Fig. 9. Showing the effect of a pressure wave striking the fiber. 5 o L-~-U~~~~~~~~~~~~~-L~~~~~~ 1 o 1 100 . ~-r~~~~~~~~~~~~~~~~~~-T~ o~~~~~~~~~~~~~~~~~~~~~~ o 5 10 15 20 25 TIME (ms) Fig.

This part of the experiment has not yet been completed but some interesting results have been obtained. The input optics in Fig. 6 produce linearly polarized light, the plane of polarization of which can be rotated about the fiber ROCHON PRISM He-Ne LASER 633nm 02:J 9 A/4 PLATE THOMPSON BEAM SPLITTER xyz MICRO POSITIONER MICROSCOPE OBJECTIVE xyz POSITIONER ~D, PHOTO DETECTORS FIBER GLUE MICROSCOPE OBJECTIVE J OSCILLOSCOPE Xl00 AMPLIFIERS Fig. 6. Sketch of Faraday rotation current measurement diagnostic on HDZP.

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