A systematic study of electron drift for gaseous chamber design

Author

Fortunato, E. ; Becker, U. ; Dinner, R. ; Kirchner, J. ; Rosera, K. ; Uchida, Y.

Author_Institution

MIT, Cambridge, MA, USA

Volume

1

fYear

1998

fDate

1998

Firstpage

106

Abstract

We present a consistent set of measurements of electron drift velocities and Lorentz deflection angles in all noble gases with methane and ethane as quenchers in magnetic fields up to 0.8 Tesla. These and many other results are available in a searchable database on the World Wide Web at http://cyclotron.mit.edu/drift/ to allow for guided design and optimization of future detectors. A simple model is used to form an empirical parameterization of the results. This compact form unifies the drift characteristics of a gas mixture over a range of electric (0-1.5 kV/cm) and magnetic (0-0.8 Tesla) fields. A more detailed model is presented which explains the surprisingly large effect of even modest (and inevitable) nitrogen contamination on electron drift velocity. Additional measurements and simulations confirm the validity of the model´s predictions and show possible applications

Keywords

diffusion; drift chambers; gas mixtures; inert gases; organic compounds; 0 to 0.8 T; Ar; He; Kr; Lorentz deflection angles; Ne; Rn; Xe; electric fields; electron drift velocity; ethane; gaseous chamber; magnetic fields; methane; noble gases; Databases; Design optimization; Detectors; Electron mobility; Gases; Magnetic field measurement; Pollution measurement; Predictive models; Velocity measurement; Web sites;

fLanguage

English

Publisher

ieee

Conference_Titel

Nuclear Science Symposium, 1998. Conference Record. 1998 IEEE

Conference_Location

Toronto, Ont.

ISSN

1082-3654

Print_ISBN

0-7803-5021-9

Type

conf

DOI

10.1109/NSSMIC.1998.774818

Filename

774818