Fixed target flammable gas upgrades

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In the past, fixed target flammable gas systems were not supported in an organized fashion. The Research Division, Mechanical Support Department began to support these gas systems for the 1995 run. This technical memo describes the new approach being used to supply chamber gasses to fixed target experiments at Fermilab. It describes the engineering design features, system safety, system documentation and performance results. Gas mixtures provide the medium for electron detection in proportional and drift chambers. Usually a mixture of a noble gas and a polyatomic quenching gas is used. Sometimes a small amount of electronegative gas is added as ... continued below

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30 p.

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Schmitt, R.; Squires, B.; Gasteyer, T. & Richardson, R. December 1, 1996.

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Description

In the past, fixed target flammable gas systems were not supported in an organized fashion. The Research Division, Mechanical Support Department began to support these gas systems for the 1995 run. This technical memo describes the new approach being used to supply chamber gasses to fixed target experiments at Fermilab. It describes the engineering design features, system safety, system documentation and performance results. Gas mixtures provide the medium for electron detection in proportional and drift chambers. Usually a mixture of a noble gas and a polyatomic quenching gas is used. Sometimes a small amount of electronegative gas is added as well. The mixture required is a function of the specific chamber design, including working voltage, gain requirements, high rate capability, aging and others. For the 1995 fixed target run all the experiments requested once through gas systems. We obtained a summary of problems from the 1990 fixed target run and made a summary of the operations logbook entries from the 1991 run. These summaries primarily include problems involving flammable gas alarms, but also include incidents where Operations was involved or informed. Usually contamination issues were dealt with by the experimenters. The summaries are attached. We discussed past operational issues with the experimenters involved. There were numerous incidents of drift chamber failure where contaminated gas was suspect. However analyses of the gas at the time usually did not show any particular problems. This could have been because the analysis did not look for the troublesome component, the contaminant was concentrated in the gas over the liquid and vented before the sample was taken, or that contaminants were drawn into the chambers directly through leaks or sub-atmospheric pressures. After some study we were unable to determine specific causes of past contamination problems, although in argon-ethane systems the problems were due to the ethane only.

Physical Description

30 p.

Notes

INIS; OSTI as DE97051080

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  • Other Information: PBD: Dec 1996

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  • Other: DE97051080
  • Report No.: FNAL-TM--1989
  • Grant Number: AC02-76CH03000
  • DOI: 10.2172/434314 | External Link
  • Office of Scientific & Technical Information Report Number: 434314
  • Archival Resource Key: ark:/67531/metadc676524

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Office of Scientific & Technical Information Technical Reports

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Creation Date

  • December 1, 1996

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • April 1, 2016, 6:23 p.m.

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Schmitt, R.; Squires, B.; Gasteyer, T. & Richardson, R. Fixed target flammable gas upgrades, report, December 1, 1996; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc676524/: accessed December 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.