Electron diffusion in a low pressure methane detector for particle dark matter

Details Electron diffusion in a low pressure methane detector for particle dark matter Electron diffusion in a low pressure methane detector for particle dark matter

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aph.....8...43l&link_type=abstract

ASTROPARTICLE PHYSICS, Volume 8, Issue 1-2, p. 43-50.

Physics

7

Scientific paper

Measurements of the transverse diffusion of drifted electrons in low pressure (19-95 torr) methane are presented. The transverse diffusion coefficient was determined both with and without a magnetic field oriented parallel to the drift, and the expected functional dependence of the diffusion coefficient on pressure, reduced electric field, and magnetic field is demonstrated. These results are then used to show that ionization tracks in a time projection chamber to be used in a particle dark matter search can be drifted distances exceeding 1 m while maintaining resolution better than 1 mm.

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