|TUPO007||FRIB Fast Machine Protection System: Chopper Monitor System Design||336|
|TUOP02||use link to see paper's listing under its alternate paper code|
Funding: Work supported by Work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661.
The Facility for Rare Isotope Beams tunes the beam power from 0 to 400KW by chopping the beam current with a beam chopper in the Low Energy Beam Transport. A chopper monitoring system is employed to verify proper chopper operation to avoid delivery of undesired high-powered beam and to inhibit beam for machine protection purposes. The system monitors the incoming beam gate time structure, the chopper switch high voltage pulses, the chopper electrode charge/discharge currents, and the status of machine protection system. It is designed to switch off the beam within tens of nanoseconds of a detected fault. Chal-lenges include a dynamic beam gate pulse structure with pulse lengths as short as 0.6 µs and high voltage power supply current pulses of ~25 ns. A high speed "integrate and hold circuit with reset", Field Program-mable Gate Array based digital control circuit and high speed ADC circuit were developed to fulfil the re-quired functions. Design approach, simulation, and test results with the beam are the focus of this paper.
|Slides TUPO007 [1.082 MB]|
|Poster TUPO007 [1.321 MB]|
|DOI •||reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO007|
|About •||paper received ※ 12 September 2018 issue date ※ 18 January 2019|
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