Abstract
A beam line for electrons with energies in the range of 1– 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 μm resolution was able to measure relative electron beam momentum precisely. The resolution σ p/ p was 0.13% at 45 GeV where multiple scattering is negligible. This test beam setup provided a possibility to study properties of lead tungstate crystals (PbWO 4) for the BTeV experiment at Fermilab.
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