Development of a Momentum Determined Electron Beam in the 1 -45 GeV   Range
  A beam line for electrons with energies in the range of 1 to 45 GeV, low contamination of hadrons and muons and high intensity up to 10^6 per accelerator spill at 27 GeV was setup at U70 accelerator in Protvino, Russia. A beam tagging system based on drift chambers with 160 micron resolution was able to measure relative electron beam momentum precisely. The resolution sigma_p p was 0.13% at 45 GeV where multiple scattering is negligible. This test beam setup provided the possibility to study properties of lead tungstate crystals (PbWO_4) for the BTeV experiment at Fermilab. 
V.A. Batarin, J. Butler, A.A. Derevschikov, Yu.V. Formin, V. Frolov,   V.N. Grishin, V.A. Kachanov, V.Y. Khodyrev, A.S. Kons...