Silicon Detector Concept (SiD)
SiD is a linear collider detector concept designed for precision measurements of a wide range of possible new phenomena at the ILC. It is based on a silicon pixel vertex detector, silicon tracking, silicon-tungsten electromagnetic calorimetry, and a highly segmented hadronic calorimetry. SiD also incorporates a high field solenoid, iron flux return, and a muon identification system. Particle Flow Analysis (PFA) is an important consideration for the basic philosophy and layout of the detector.
The choice of silicon detectors for tracking and vertexing ensures that SiD is robust with respect to beam backgrounds or beam loss, provides superior charged particle momentum resolution and eliminates out of time tracks and backgrounds.
The innermost tracking sub-system is the Vertex Detector (VXD), which comprises 5 cylinders and 4 sets of endcaps, composed of pixilated sensors closely surrounding the beampipe. The impact parameter resolution will surpass σrφ = σrz = 5 Å 10/(p sin3/2 θ) [μm]. SiD has chosen a 5 T solenoidal field in part to control the e+e- pair background, and the cylinder and disk geometry is chosen to minimize scattering and ensure high performance in the forward direction. The VXD sensor technology is not yet chosen because the relatively high luminosity per train at the ILC makes integration through the train undesirable, and optimal technologies for separating the train into small temporal segments, preferably bunches, have not been determined. This choice will have almost no effect on the rest of the SiD design, and the VXD can be built and installed after many of the main detector components are complete.
Updated 14 January 2010 by Tomas Lastovicka