Dimethylether: a low velocity, low diffusion drift chamber gas
There are two main motivations to look for a low electron mobility gas: the first is that a low drift velocity relaxes the need to measure drift times with nanosecond (or even subnanosecond) precision; the second is that (in an ideal drift geometry), the capability of resolving two closely spaced tracks depends upon the ratio of electron mobility to ion mobility ..mu../sub e//..mu../sub i/. Since ..mu../sub i/ is rather constant, the way to separate two tracks is to slow down the electrons. Many other properties are required besides low mobility and low drifting electron temperature: the gas should have a large (> 10/sup 3/) stable gain; it must be chemically stable and not oxic; it should not attack materials commonly used to fabricate drift chambers, etc. With these requirements in mind, we have tried a few promising (on paper) gases, either pure or in admixture with Argon. One of the gases examined, dimethylether ((CH/sub 3/)/sub 2/)), has shown interesting characteristics.
- Research Organization:
- Stanford Linear Accelerator Center, CA (USA)
- DOE Contract Number:
- AC03-76SF00515
- OSTI ID:
- 5983432
- Report Number(s):
- SLAC-PUB-3037; CONF-830223-7; ON: DE83016679
- Resource Relation:
- Conference: Wire chamber conference, Vienna, Austria, 15 Feb 1983
- Country of Publication:
- United States
- Language:
- English
Similar Records
Aging in the large CDF axial drift chamber
Performance of the SLD Central Drift Chamber
Related Subjects
DRIFT CHAMBERS
ADDITIVES
METHYL ETHER
ELECTRON MOBILITY
ION MOBILITY
ARGON
DIFFUSION
GASES
MIXTURES
DISPERSIONS
ELEMENTS
ETHERS
FLUIDS
MEASURING INSTRUMENTS
MOBILITY
MULTIWIRE PROPORTIONAL CHAMBERS
NONMETALS
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
PARTICLE MOBILITY
PROPORTIONAL COUNTERS
RADIATION DETECTORS
RARE GASES
440104* - Radiation Instrumentation- High Energy Physics Instrumentation