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Work at FNAL to Achieve Long Electron Drift Lifetime in Liquid Argon

S. PordesP. A. RapidisD. FinleyC. KendzioraJ. KriderT. TopeW. Jaskierny

出版	United States. Department of Energy, 2006
URL	http://books.google.com.hk/books?id=4HrFjwEACAAJ&hl=&source=gbs_api

註釋This note records some of the work done between July 2005 and July 2006 to achieve long (many milliseconds) electron drift lifetimes in liquid argon at Fermilab. The work is part of a process to develop some experience at Fermilab with the technology required to construct a large liquid argon TPC. This technology has been largely developed by the ICARUS collaboration in Europe and this process can be seen as technology transfer. The capability to produce liquid argon in which electrons have drift lifetimes of several milliseconds is crucial to a successful device. Liquid argon calorimeters have been successfully operated at Fermilab; their electro-negative contaminants are at the level of 10{sup -7} while the TPC we are considering requires a contamination level at the level of 10{sup -11}, tens of parts per trillion (ppt). As well as demonstrating the ability to produce liquid argon at this level of purity, the work is part of a program to test the effect on the electron drift time of candidate materials for the construction of a TPC in liquid argon.