Abstract
Cylindrical chambers as long as 96 in. with a 3 in. gap turned on a 6 in. radius have been built and operated successfully as wide gap chambers. Made from 3.0 mil thick Mylar toroidal gas cells surrounded with appropriate conducting electrodes, these chambers are completely self-supporting upon inflation with helium or spark chamber grade neon gas. Requiring no massive internal or external supports, their large solid angle acceptance, high visibility and low mass make them the ultimate in simplicity. Due to the non-linear field of the cylindrical geometry, however attempts to operate the chamber in the streamer made have failed to produce streamers useful for precision measurements of particle trajectories. Details of construction, operation and response of the chamber are included in the text along with photographs of particle tracks observed in the chambers. Additional photographs are available in W. S. Risk, University of Maryland Technical Report No. 72-030. Development work on these chambers was terminated in February of 1970.
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