Development of a multistep parallel-plate chamber as time projection chamber end-cap or vertex detector

Conference · Wed Feb 01 00:00:00 EST 1984 · IEEE Trans. Nucl. Sci.; (United States)

OSTI ID:6919650

Peisert, A; Charpak, G; Sauli, F; Viezzoli, G

In the course of development of the multistep avalanche chamber the authors have realized several multiple electrode parallel-plate devices exhibiting stable gains well in excess of 10/sup 5/ which are thus capable of detecting minimum ionizing particles. This paper presents the design and discusses the performance of a two-step parallel-plate avalanche chamber. A region of moderate electric field --the drift region where charges are released by ionizing radiation--is followed by two layers of comparable and very high field where charge multiplication occurs. Owing to the choice of the electrodes--either cross-wire meshes or parallel thick-wire grids at small pitch--the electric field is uniform over most of the gaps, and charge multiplication proceeds through a parallel-plate avalanche mode. In order to obtain a fast signal and a reduced avalanche spread in their prototypes, the authors have adopted rather narrow typical gaps of 4 mm for the first amplification region and 1 mm for the second. To avoid edge sparking, they have used either a gap increase at the edges or the insertion of thin mylar foil around the frame's edges. The last electrode in the structure, made with a printed-circuit board, is the only one equipped with electronics and is conveniently operated at ground potential. At regular intervals, four rows of pads are used to determine the coordinates of tracks in selected positions. Argon (90%) and methane (10%) comprise the gas filling.

• Research Organization: Max-Planck Institute, Munich
• OSTI ID: 6919650
• Report Number(s): CONF-831015-
• Conference Information: Journal Name: IEEE Trans. Nucl. Sci.; (United States) Journal Volume: 31:1
• Country of Publication: United States
• Language: English

Related Subjects

440104* -- Radiation Instrumentation-- High Energy Physics Instrumentation
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
ALKANES
AMPLIFICATION
ARGON
AVALANCHE QUENCHING
CHARGE DISTRIBUTION
CHARGED PARTICLE DETECTION
DESIGN
DETECTION
ELECTRODES
ELECTRONIC CIRCUITS
ELEMENTS
FLUIDS
GAIN
GAS TRACK DETECTORS
GASES
HYDROCARBONS
ION DRIFT
MEASURING INSTRUMENTS
METHANE
NONMETALS
ORGANIC COMPOUNDS
PLATES
PRINTED CIRCUITS
PROJECTION SPARK CHAMBERS
RADIATION DETECTION
RADIATION DETECTORS
RARE GASES
RESOLUTION
SIGNAL DISTORTION
SPACE CHARGE
SPARK CHAMBERS
TIMING PROPERTIES