Requirement:
Cylindrical symmetry with full azimuthal coverage and a large pseudorapidity coverage about midrapidity.
Justification:
One purpose of STAR is to study global observables for relativistic
Au + Au central collisions. One variable in these studies will be
pseudorapidity. Fluctuations and
statistics are also very important for the event-by-event physics
to be done by STAR, and such studies require the
largest possible pseudorapidity coverage.
The TPC is designed
to do full tracking for the pseudorapidity range
and full azimuthal coverage.
Since the SVT is to complement and enhance data taken with the TPC,
it is clear that the same pseudorapidity region should be covered
if possible.
In addition, the new physics provided by the SVT alone will
have very small cross sections so that the largest pseudorapidity
coverage possible should be implemented.
Status:
The SVT design (see Table I) provides full azimuthal coverage
for 
. See also
Chapter 22.