Studies of the properties and performances of small-gap wire chambers and Micromegas detectors for LC-TPC readout are presented. Gas amplification, drift and attachment studies, and aging effects are reported for Micromegas devices with several gases and mixtures. Preliminary results on positive ion feedback in a 2T magnetic field are summarized. The design of a Micromegas TPC with fine metallic micromesh structures of different pitches and anode pad readout for testing in a high magnetic field is discussed. |
