beam direction scan j18

Scan of the beam direction with SPR as observable.

  • CERN 18
  • S403, bar with 3-layer spherical lens
  • protons @ 7 GeV/c
  • geometrical reconstruction
  • delta t selection with 1.5 ns
  • vertical bar ambiguities are not considered

Example of the likelihood difference after correction for 20 degree (before correction sep=~2.4 s.d.):