Electrical diagnostics on a high-power microwave generator

HGURES 1. OveraU diagram of the Texas Tech High-Power Microwave Facility 4 2. Oil switch and diode region 5 3. Schematic layout of project diagnostics 8 4. Resistive divider circuit 9 5.Typical waveform from the PT-55 spiral generator 10 6.Typical output from the Marx voltage probe 12 7. Divider electrode of the diode voltage probe 13 8.Schematic of Butterworth lowpass filter 14 9. Frequency response of the n=6 Butterworth lowpass filter 15 10.Coaxial 50 W test chamber 17 11.System for obtaining input and output waveforms fortransfer function 18 12.Input and output waveforms for transfer function 18 13.Transfer function for the diode voltage probemeasured using the tapered section test chamber 19 14.Filtered output versus input to diode voltage probe 19 15.Uncompensated diode voltage as measured bythe diode voltage probe 20 16.Software compensated diode voltage asmeasured by the diode voltage probe 20 17. Lumped element model for a transmission line 22 18.Lumped element model for the slow-wave Rogowski coil 22 19.Rogowski section schematic 25 20.Drawing of assembled Rogowski section 26 21.Placement of the Rogowski section 28 22. Rogowski section calibration setup 29 23.Rogowski section output for 600 ns input pulseand 400ns delay line 29 24.Rogowski section output for 68 ns input pulseand 400ns delay line 30 25. Rogowski section output for 68 ns input pulseand no delay line 31 26.Typical Rogowski section response when measuringthe diode current 32 27.Photograph of the fluorescent tubes undermicrowave illumination 33 28.Photograph of the window breaking down 33 iv 29.A typical waveform from the PMT with ambientair on the window 30.Microwave signal showing frequency 31.Spectral density of the microwave signal 32.Data points and curve fit for diode detector 33.Typical waveform from the diode detector 34.Typical waveform from the diode detector converted to power density 35.Setup for timing of diagnostic signal lines 36.Results of the timing of the diagnostic signal lines 37. PMT signal timing 38.Timing mark generator schematic 39.Triggering and timing mark setup CHAPTER 1