Work at FNAL to achieve long electron drift lifetime in liquid argon Page: 1 of 9
This report is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided to UNT Digital Library by the UNT Libraries Government Documents Department.
Extracted Text
The following text was automatically extracted from the image on this page using optical character recognition software:
FERMILAB-TM-2385-E
Work at FNAL to achieve long Electron Drift
Lifetime in Liquid Argon
D. Finley, W. Jaskierny, C. Kendziora, J. Krider,
S. Pordes, P.A. Rapidis* T. Tope
Particle Physics Division, Fermilab
October 27, 2006
Introduction
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 Fer-
milab [1]. 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 tech-
nology 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 10-7 while
the TPC we are considering requires a contamination level at the level of 10-11,
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.
General Description
Both the scheme adopted to achieve clean argon and the technique used to
measure the electron drift lifetime were copied from ICARUS [2]. That the
oxygen filter should operate on liquid argon was an ICARUS development [3],
and the device used to measure the lifetime, the so-called Purity Monitor or PrM
[4], is also an ICARUS development. Two things are new in our implementation;
one is the oxygen filter material used, a copper alumina catalyst [5], and the
second is that the filter can be and has been regenerated in place. The FNAL
purity monitors also differed from the version we were loaned in some details.
The long rods were made from PEEK [7] instead of G-10. To reduce electrical
noise, the internal cabling was changed from RG-316 to RG-180 and the internal
*now at Demokritos Institute, Athens, Greece1
Upcoming Pages
Here’s what’s next.
Search Inside
This report can be searched. Note: Results may vary based on the legibility of text within the document.
Tools / Downloads
Get a copy of this page or view the extracted text.
Citing and Sharing
Basic information for referencing this web page. We also provide extended guidance on usage rights, references, copying or embedding.
Reference the current page of this Report.
Finley, D.; Jaskierny, W.; Kendziora, C.; Krider, J.; Pordes, S.; Rapidis, P. A. et al. Work at FNAL to achieve long electron drift lifetime in liquid argon, report, October 1, 2006; Batavia, Illinois. (https://digital.library.unt.edu/ark:/67531/metadc889842/m1/1/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.