Physics with THERA, the TESLA on HERA Collider
The physics potential is discussed of the electron-nucleon collider
THERA which, based on the proposed e^+e^- linear collider TESLA and the HERA
proton ring at DESY, allows the energy frontier in deep inelastic physics
to be advanced up to center of mass energies of about 1.6 TeV, i.e. experimentation
at momentum transfers squared Q^2 around 1,000,000~GeV^2 and Bjorken x as
low as 10^(-6) in the perturbative region. The talk summarises the results
of a recent study within the TESLA Technical Design Phase, i.e. the main
physics topics and aspects of the possible realisation of the THERA project
and detector.