Fusion Neutron-Induced Soft Errors During Long Pulse D-D Plasma Discharges in the WEST Tokamak
HAL (Le Centre pour la Communication Scientifique Directe)(2024)
摘要
We have performed real-time soft error rate (SER) measurements on bulk 65 nm static random-access memories (SRAMs) during deuterium–deuterium (D-D) plasma operation at W–tungsten– Environment in Steady-state Tokamak (WEST). The present measurement campaign was characterized by the production of several tens of long pulse discharges (~60 s) and by a total neutron fluence (at the level of the circuits under test) up to ~10
9
n.cm
-2
, improving the error statistics by a factor of more than 6 with respect to the first measurements obtained in 2020. Experimental results demonstrate the occurrence of bursts of single-event upsets (SEUs) during the most efficient shots and 12% of multiple cell upset (MCU) events. Time-resolved data also show that MCUs are preferentially detected in the last part of these long pulses, providing further evidence that higher energy neutrons, initiated by deuterium–tritium (D-T) reactions due to triton burn-up in the D-D plasma, may play a role in the production of multiple cell upsets that cannot be attributed in such large proportions to “low energy” neutrons produced in D-D reactions.
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关键词
Complementary metal-oxide-semiconductor (CMOS),deuterium–deuterium (D-D),deuterium–tritium (D-T),fusion,neutron,real-time experiment,single-event effects (SEEs),soft-error rate (SER),single-event upset (SEU),static random-access memory (SRAM),tokamak,International Thermonuclear Experimental Reactor (ITER),W–tungsten– Environment in Steady-state Tokamak (WEST)
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