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Beam

The CERN SPS (Super Proton Synchrotron) delivered spills of $Pb^{82+}$ ions accelerated up to the 158 GeV/c/nucleon momentum. NA44 was located in the H4 beam line. Geometrically, the $Pb$ beam had a rectangular, vertically elongated cross-section of about 1mm$\times$2mm [28]. The equipment for beam profile scanning was provided by the SPS, located in the beam channel and included scintillating filaments and gas detector chambers. The beam was coming in 5 s long spills (bursts), and was collimated to obtain an intensity of, typically, several million particles per spill.