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NA49 Tracking
A central collision of a lead projectile with a lead nucleus as
recorded by the four large volume Time Projection Chambers (TPCs) of
the NA49 fixed target experiment. The 150 GeV per nucleon 208Pb beam
from the SPS (total energy 32.8 TeV), coming from the lower left in
the picture, interacts with the target 80 cm in front of the first
TPC. For momentum determination the first two TPCs are placed inside
superconducting magnets of 1.5 and 1.1 T field strength.
Over 80% of the 2000 charged particles created in central events
produce tracks in the sensitive volume of the detectors. Their
ionization drifts up to the readout chambers, shown as small
rectangles, on the top of the detectors. A total of 182,000 readout
pads record 512 time samples each for the drifting ionization. Space
points, shown here is red, are reconstructed into tracks, purple, and
matched over the different TPCs to global tracks, yellow, of up to 14
m length with an accuracy better than 200 microns. The specific
ionization for long tracks is determined with better than 4%
resolution, permitting particle identification in the relativistic
rise region of energy loss.
The aim of the experiment is to study the non-perturbative QCD
processes leading to the production and decay of the large partonic
systems formed in central Pb+Pb collisions, reaching energy densities
20 times normal nuclear density for a brief instant of time.
Index produced by
thumbnail_index.
