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Multiple high voltage modulators operating independently from a single common 100 kV dc power supply

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5 Author(s)
McDaniel, W.L. ; Gen. Atomics, San Diego, CA, USA ; Huynh, P. ; Anastasi, D.D. ; Tooker, J.F.
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This paper will describe a system where three gyrotrons can be independently operated, each with their own current, voltage and timing parameters, from a single 100 kV dc power supply. The supply enables each load to run simultaneously, sequentially, or by overlapping each other as long as the power rating of the dc supply is not surpassed. By taking full advantage of the capabilities of the front end power system, there is reduced cost, maintenance, and a lower number of high risk, high voltage components. The system also saves maintenance and complexity in lower level components thanks to a common safety and control system shared by each of the load regulators. Gyrotrons have a nonlinear voltage-current characteristic that need to be isolated from each other, so they each have their own modulators. By operating parallel modulators from a single supply, versus operating parallel gyrotrons from a single modulator, different operating modes can be obtained. For example, these modulators may be run simultaneously, where two gyrotrons can be run in parallel. They may also be dasiaphasedpsila in and out so that they can be driven sequentially or by staggering the turn on and turn off times. This phased method will allow three gyrotrons operating, a number not otherwise supported by the rectifier power rating to be operated from a single 100 kV supply. In addition, different fault handling techniques, using a blended control system will be presented. This system implements a PLC for general dasiaMasterpsila control, and dasiaslowpsila safety protections while relying on fast analog electronic logic circuits for the critical and potentially load damaging faults. Finally, there is acceptable risk of losing operation of all three gyrotrons simultaneously due to a single power supply fault. However, as presented in this paper, steps including fast logic control, and Tetrode dasiablockingpsila have been implemented to mitigate this risk as much as possible.

Published in:

Fusion Engineering, 2009. SOFE 2009. 23rd IEEE/NPSS Symposium on

Date of Conference:

1-5 June 2009