Open AccessOptimization of the gas flow in a GEM chamber and development of the GEM foil stretcher
Author(s) -
F. Noto,
Smet Valerie de,
V. Bellini,
E. Cisbani,
F. Librizzi,
F. Mammoliti,
M. C. Sutera
Publication year - 2014
Publication title -
nuclear technology and radiation protection
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.31
H-Index - 16
eISSN - 1452-8185
pISSN - 1451-3994
DOI - 10.2298/ntrp140ss39n
Subject(s) - gas electron multiplier , modular design , upgrade , materials science , electron , foil method , nuclear engineering , physics , mechanical engineering , computer science , nuclear physics , engineering , composite material , operating system
The gas electron multiplier technology has been proven to tolerate rat e larger than 50 MHz/cm2 without noticeable aging and to provide sub resolution on working chambers up to 45 cm x 45 cm. A new gas electron multiplier-based tracker is under development for the Hall A upgrade at Jefferson Lab. The chambers of the tracker have been designed in a modular way: each chamber consists of 3 adjacent gas electron multiplier modules, with an active area of 40 cm x 50 cm each. We optimized the gas flow inside the gas electron multiplier module volume, using the COMSOL physics simulator framework; the COMSOL-based analysis includes the design of the inlet and outlet pipes and the maximization of the uniformity of the gas flow. We have defined the procedures for the assembling of the gas electron multiplier modules and designed a mechanical system (TENDIGEM) that will be used to stretch the GEM foils at the proper tension (few kg/cm); the TENDIGEM is based on the original design developed at LNF