Effects of non-parallel magnetic fields on hexagonal cell drift chambers

Author

Mestayer, M.D. ; Tam, C.L. ; Wang, K. ; Baghaei, H. ; Christo, S. ; Dytman, S.A. ; Gilfoyle, G.P. ; Hewitt, J.D. ; Hersman, F.W. ; Hicks, R.S. ; Miskimen, R.A. ; Schumacher, R. ; Vineyard, M.F.

Author_Institution

CEBAF, Newport News, VA, USA

Volume

39

Issue

4

fYear

1992

fDate

8/1/1992 12:00:00 AM

Firstpage

690

Lastpage

695

Abstract

The effect of magnetic field on drift velocity was measured in a wire chamber with a hexagonal cell geometry and an argon-ethane gas mixture. Using cosmic ray tracks, the drift-time-to-distance correlation was studied as a function of magnetic field strength. Particular attention was paid to the corrections due to differing track entrance angles and differing angles of the magnetic field direction with respect to the wire axis. Spatial resolutions better than 180 μm were achieved for field strengths up to 1.5 T and angles between wire and field direction ranging from 0° to 30°. An argon-ethane mixture diluted with 60% helium showed less sensitivity to magnetic field effects, and only slight worse resolution

Keywords

position sensitive particle detectors; proportional counters; Ar+ethane; argon-ethane gas mixture; drift velocity; drift-time-to-distance correlation; hexagonal cell drift chambers; magnetic field direction; nonparallel magnetic field effects; track entrance angles; wire chamber; Electron mobility; Energy resolution; Geometry; Helium; Spatial resolution; Spectroscopy; Superconducting filaments and wires; Superconducting magnets; Testing; Toroidal magnetic fields;

fLanguage

English

Journal_Title

Nuclear Science, IEEE Transactions on

Publisher

ieee

ISSN

0018-9499

Type

jour

DOI

10.1109/23.159689

Filename

159689