  Following the Higgs particle discovery, the Large Hadron Collider complex
will be upgraded in several phases allowing the luminosity to increase to $7
\times 10^{34}cm^{-2}s^{-1}$. In order to adapt the ATLAS detector to the
higher luminosity environment after the upgrade, part of the ATLAS muon end-cap
system, the Small Wheel, will be replaced by the New Small Wheel. The New Small
Wheel includes two kinds of detectors: small-strip Thin Gap Chambers and
Micromegas. Shandong University, part of the ATLAS collaboration, participates
in the construction of the ATLAS New Small Wheel by developing, producing and
testing the performance of part of the small-strip Thin Gap Chambers. This
paper describes the construction and cosmic-ray testing of small-strip Thin Gap
Chambers in Shandong University.
