A study of MICROMEGAS in TPC mode

Micropatterned gas detectors like Gas Electron Multipliers and MICROMEGAS detectors are expected to play key roles in TPCs (time projection chambers) in future linear collider experiments. Both devices have ideal behavior in the TPC mode such as minimal E×B effects and the excellent suppression of ion feedback (a few percent). Both devices can be used instead of the conventional pad readout of induced charge and charge amplification by thin wires. We report results of an ion feedback study in an MICROMEGAS detector using the same method previously used for GEM ion feedback study.