The second main theme of WP7
is the in-depth study of impurities in detector gases and fluids
coolants) and their effect on the detector performance in high
Most muon detectors are based on gas
detector technologies (RPC, drift tube, drift chamber, TGC, CSC,
GEM, etc). In the gas amplification process the gas molecules
are ionized, dissociated or fragmented; afterwards they
recombine to new stable objects. When operated in a high
radiation environment, e.g. as in the forward muon systems, many
different chemically very reactive impurities are created which
are potentially dangerous for the detector materials and the gas
system. The study aims at the understanding of these processes
in the GIF irradiation field and the development of methods to
mitigate or reverse the degrading effects.
objective of this activity,
in 2008, is
the consolidation of RPC operation in LHC.
We will study the
impurities produced in RPC chambers irradiated in the
in order to understand the properties of possible absorbers. The
following questions should
What kind of impurities
are produced and in what concentrations?
Which are the harmful
impurities that degrade the signal or cause dark currents?
What is the dependence of
the impurity concentrations on the gas flow and the degree
Which absorbers can be
used to remove what pollutant?
What is the capacity and
the lifetime (ageing of the product) of the absorbers?
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