@inproceedings{2dbe2b8964994d6ab66219dceb6e538c,
title = "Performance of a gas avalanche pixel detector of 50 μm pitch",
abstract = "We describe the performance of a square micro-dot (MDOT) detector of 50 μm pitch, in terms of defocussing effect and gas gain. Both the count rate variation measurement and the computer simulation showed that the defocussing effect disappeared in the 50 μm pitch MDOT. Initial charge build-up on the detector surface was also minimised when the small lateral dimension was combined with surface coating. The maximum gas gain was limited to approx. 1200 due to the small distance available for avalanche multiplication. We also developed a two-level microdot, namely closed-end gas electron multiplication (CEGEM) chamber. A CEGEM detector having a pitch of 200 μm, holes of 40 μm width and a spacer layer of 18.5 μm thickness showed a maximum gain of approx. 400. This gain is expected to increase by increasing the spacer layer thickness and adjusting the hole size.",
author = "Hong, \{W. S.\} and Cho, \{H. S.\} and F. Retiere and S. Han and J. Kadyk and V. Perez-Mendez",
year = "1999",
language = "English",
isbn = "0780350227",
series = "IEEE Nuclear Science Symposium and Medical Imaging Conference",
publisher = "IEEE",
pages = "101--105",
booktitle = "IEEE Nuclear Science Symposium and Medical Imaging Conference",
note = "Proceedings of the 1998 IEEE Nuclear Science Symposium Conference Record ; Conference date: 08-11-1998 Through 14-11-1998",
}