Novel method for in-situ drift velocity measurement in large volume TPCs: the Geometry Reference Chamber of the NA61/SHINE experiment at CERN
arxiv(2024)
摘要
This paper presents a novel method for low maintenance, low ambiguity in-situ
drift velocity monitoring in large volume Time Projection Chambers (TPCs). The
method was developed and deployed for the 40m^3 TPC tracker system of the
NA61/SHINE experiment at CERN, which has a one meter of drift length. The
method relies on a low-cost multi-wire proportional chamber (MWPC) placed
downstream of the TPCs to be monitored. The drift velocity is then determined
by matching the reconstructed tracks in the TPC to the hits of the pertinent
monitoring chamber, called Geometry Reference Chamber (GRC), which is then used
as a differential length scale. An important design requirement on the GRC was
minimal added complexity to the existing system, in particular, compatibility
with Front-End Electronics (FEE) cards already used to read out the TPCs.
Moreover, the GRC system was designed to operate both in large and small
particle flux. The system is capable of monitoring the evolution of the in-situ
drift velocity down to a one permil precision, with a few minutes of time
sampling.
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