Other future electron-hadron collider facilities under consideration:

HERA III Physics Workshop

A workshop on The New Frontier in Precision Lepton-Nucleus Physics was held at the Max Planck Institute in Munich in December 2002. Issues regarding polarized e-p and e-A physics at HERA (see below) were re-visited and a dedicated low x e-p physics program was introduced in to the possible future options of physics at HERA/DESY. Other fixed target experiments were at DESY were also discussed. See webpage for further details.

Polarized e-p scattering at HERA:

Polarizing the existing HERA proton beam and using the already polarized electron beam in HERA to study polarized DIS in a significantly increased kinematic region. This is one of the options for the future HERA physics program and was studied in the following workshops:

The 1999 Workshop/Conference on Polarized Protons at High Energies: Accelerator Challenges and Physics Opportunities.
The 1997 workshop dedicated to the study of "Physics with Polarized Protons and Electrons at HERA". See proceedings for details.
The 1995/96 Workshop

proceedings

Physics with nuclear beams in HERA ring:

If instead of polarizing the protons at HERA, nuclear beams are circulated in the HERA ring, one could do e-A scattering at DESY. The physics potential and feasibility of this option was studied in the following workshops:

Physics with HERA as eA collider, May 25-26 1999 at DESY
The 1995/96 Workshop

proceedings

Physics with Tesla*HERA (THERA) Collisions in the far future:

This will use the polarized electron beam from the Tesla/Linear Collider and the polarized proton beam from HERA. If HERA decides to put instead of polarized protons, heavy ions in its hadron ring, one could do unpolarized e-A scattering in such configuration as well.