Fiber Optic Analog And Timing Monitoring System For The Antares Laser Fusion Program

J. L. Longmire; M. E. Thuot

doi:10.1117/12.932452

Abstract

The development and use of two optical fiber systems for the Antares 40 kJ CO2 laser is described. In the Antares power amplifier, electron guns produce a discharge sustaining 8 kA beam of 500 kV electrons. Eight 300 kJ, 3 μs Marx pulsers provide a direct electrical pumping discharge through the laser gas. The electro-optic systems developed allow the measurement of pulsed analog waveforms and trigger timing information within the laser and power systems by a computer based control and data acquisition network.* Each fiber optic system consists of a signal powered transmitter, a fiber optic cable, and an optical receiver that interfaces through a CAMAC module to the data acquisition network. The data channels are capable of operating with 1.2 MV of common mode voltage in the electromagnetic interference environment, 500 kV/m and 50 kA/m, produced by the Marx pulsers. The analog transmitters send 10 MHz bandwidth information to CAMAC waveform digitizers in the data acquisition system. About 200 data channels monitor voltage and current in the pulsers and current density in the laser power amplifiers. The laser transmitters send 2 ns resolution timing information from each stage of the Marx trigger amplification and the Marx output to CAMAC time-to-digital converters. These 120 channels of information are processed to provide prefire diagnostics for the energy storage systems.

Citation Download Citation

J. L. Longmire, J. L. Longmire, M. E. Thuot, M. E. Thuot, } "Fiber Optic Analog And Timing Monitoring System For The Antares Laser Fusion Program", Proc. SPIE 0296, Fiber Optics in Adverse Environments I, (22 January 1982); doi: 10.1117/12.932452; https://doi.org/10.1117/12.932452

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