I found this article on the detectors for the ILC.
From the abstract
We are optimizing our two detectors, International Large
Detector (ILD) and Silicon Detector (SiD) to maximize the physics reach expected in ILC with reasonable detector
cost and good reliability.
It lists the physics they want to pursue and compares the two detectors discussed at present
ILD employs Time Projection Chamber (TPC) for the
main tracking device, operating with inner and outer silicon strip layers. SiD, in constrast, has only five silicon
strip layers in addition to the vertex layers. ILD has a
larger tracking system of about 1800 mm radius with 3.5
Tesla of magnetic field in the current design, while SiD
has smaller one of 1200 mm with 5.0 Tesla of magnetic field
Way back when working at LEP I was involved with the construction of the ALEPH TPC,( time projection chamber) a beautiful detector for tracking, and it seems that this is the proposed tracking detector for the international collaboration. The silicon collaboration obviously depends on silicon for tracking.
For the performance, ILD gives better momentum
resolution in low pT tracks, with SiD better in high pT
tracks, as shown in Fig. 4. For the material budget, ILD
and SiD have similar material at barrel region, but in
endcap region ILD has more material because of elec-
tronics of TPC at endplates. As a unique capability of
can be obtained at the energy deposit from
TPC. The effect of dE/dx
to physics is now being investigated. On the other hand, SiD tracking is more robuston dense track environment
Anyway it seems that the comparison of the two types is ongoing, and depends on the importance of the interaction channels to be detected.
We aim to conclude the optimization to establish final designs in a few years, to
finish detector TDR and proposal in reply to expected
”green sign” of the ILC project