Diogene : A 4π pictorial drift chamber
With Diogène, we have a detector which can handle charged particle multiplicities up to at least 40. The maximum of counts which can be recorded per wire is 8, limiting theoretically the possible multiplicity to 80. The actual limit is certainly smaller due to double track resolution and the difficulty to reconstruct the pattern, which increases exponentially with the density of tracks. The drift chamber covers about 85 % of the full 4π solid angle, with polar angles ranging from 20° to 155°. However the momentum resolution becomes poor at very forward and backward angles when the number of hitted wires becomes small. The following resolutions are expected 10–15 % for the momentum, 1° to 2° for the polar angle and less than 1° for the azimuth σ. The various particles, π±, p, d, t ... can be easily identified. The measurable energy range for light particles is very large as can be seen from Fig. 3. A drawback of Diogene is that it does not measure neutral particles, thus leading to some lack of information about the events. The situation is however more or less the same with other large solid angle detectors. The facts that our coils are in aluminium (and not in copper) and that the yoke is only located at the top and the bottom of the chamber will allow us in future to put detectors for neutral particles on the sides of Diogène.
KeywordsNeutral Particle Momentum Resolution Anode Wire Plastic Wall Sense Wire
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