A double-GEM plus anode-wire TPC prototype reaches 0.58% ion back-flow at gain ~2500 with 10% energy resolution.
Shen, et al., MWPC prototyping and performance test for the STAR inner TPC upgrade, Nucl
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Studies on ion back-flow of Time Projection Chamber based on GEM and anode wire grid
A double-GEM plus anode-wire TPC prototype reaches 0.58% ion back-flow at gain ~2500 with 10% energy resolution.