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We measured the properties of a novel combination of two Gas ElectronMultipliers with a Micromegas for use as amplification devices in high-rategaseous time projection chambers. The goal of this design is to minimize thebuildup of space charge in the drift volume of such detectors in order toeliminate the standard gating grid and its resultant dead time, whilepreserving good tracking and particle identification performance. We measuredthe positive ion back-flow and energy resolution at various element gains andelectric fields, using a variety of gases, and additionally studied crosstalkeffects and discharge rates. At a gain of 2000, this configuration achieves anion back-flow below 0.4% and an energy resolution better than$\sigma/\text{E}=12\%$ for $^{55}$Fe X-rays.

Combination of two Gas Electron Multipliers and a Micromegas as gain elements for a time projection chamber