The Small angle TIle Calorimeter (STIC) is a lead/scintillator sampling calorimeter read out with wavelength shifter fibres and phototetrode tubes. The full calorimeter is composed by two cylinders with projective geometry and a tower structure defined by the scintillator tiles. A 3 % energy resolution at 45 GeV and a spatial uniformity better than 2 % has been measured on a test beam at CERN SPS. The precise mechanical construction will allow to measure luminosity at the 2 per mil level.
One layer (there are 47 layers of lead-scintillator) looks like
There are 1600 holes in this layer to let the wavelength shifter fibers go through.
The various parts of the detector and of the shielding are shown in
Tou can see in blue the beam pipe, in purple the TPC laser boxes, in green the scintillator planes in front of STIC (two layers of 16 wedges each), in red the external (wrt to beam pipe) syncrotron radiation shielding.
a cut view shows the two layers of Silicon detectors inside the STIC, covering the inner part of the detector acceptance.
You can see, just in front of STIC (the light blue plane) the tungsten "nose" (machined with a precision of 10 microns) that defines the acceptance for Bhabha events.
For each event, these informations are produced :
Dedicated electronics is used to produce the local trigger results for the first and second level. The 3rd level trigger (software) is not yet implemented. The only Sub-detector presently used in trigger is the Calorimeter.
You can find more information in the contributions to conferences and in STIC Delphi notes.
Back to the STIC homepage or the DELPHI home page.