A 100-KV, 2-KA, 2.5-Microsecs Pulser for Developing and Calibrating Long-Pulse Diagnostics
LOS ALAMOS NATIONAL LAB NM
Pagination or Media Count:
The development of voltage and current probes 1 for measuring an electron beam s current and position associated with several microsecond-long pulses from advanced Linear Induction Accelerators requires a precision pulser that can deliver both high voltages and high currents to a diagnostics Test Line. Seven-stage, type-E PFNs have been utilized in both a transformer and 4-stage Marx plusminus configuration. The resulting 50-ohm pulser delivers to the Test Line a repeatable 100 kV, 2 microsecond flat-top - 1, 2.5 microsecond FWHM pulse with a rise time of 500 ns and 175 ns for the transformer and Marx options, respectively. Methods of reducing the rise time for both options are discussed and modeled. The coaxial Test Line is insulated at up to two atmospheres with SF6 and includes two transition regions to hold and test different diameter beam current and position monitors BPMs. The center conductor incorporates both translation and tiptilt with an accuracy of 100 micrometer. Finally, the line is terminated in a matched radial resistor that provides a planar region at fields up to 40 kVcm for the testing of voltage probes. Both the transformer and Marx options are modeled and compared to experimental results.
- Particle Accelerators