Luminosity, Energy and Polarization Studies for the Linear Collider:   Comparing e+e- and e-e- for NLC and TESLA
  We present results from luminosity, energy and polarization studies at a future Linear Collider. We compare e+e- and e-e- modes of operation and consider both NLC and TESLA beam parameter specifications at a center-of-mass energy of 500 GeV. Realistic colliding beam distributions are used, which include dynamic effects of the beam transport from the Damping Rings to the Interaction Point. Beam-beam deflections scans and their impact for beam-based feedbacks are considered. A transverse kink instability is studied, including its impact on determining the luminosity-weighted center-of-mass energy. Polarimetry in the extraction line from the IP is presented, including results on beam distributions at the Compton IP and at the Compton detector. 
M. Woods, A. Florimonte, K.C. Moffeit, T.O. Raubenheimer, A. Seryi, C.   Sramek