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Scintillator Veto for the FCAL

Scintillator Veto for the FCAL. Goal: Put a scintillator paddle in front of the FCAL to identify neutrons in the FCAL. The paddles would be used to veto charged hadrons (protons, etc) and interactions in the beam-pipe, etc. Some blockage here, but can be squeezed in. paddle.

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Scintillator Veto for the FCAL

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  1. Scintillator Veto for the FCAL • Goal: Put a scintillator paddle in front of the FCAL to identify neutrons in the FCAL. • The paddles would be used to veto charged hadrons (protons, etc) and interactions in the beam-pipe, etc. Some blockage here, but can be squeezed in paddle • This allows one to identify forward diffractive neutrons, which already have shown interesting transverse asymmetries, and also may make a clean luminosity monitor.

  2. We can see finite asymmetry in other energy RUN ! sqrt(s)=62.4 GeV sqrt(s)=410 GeV  go to 500 GeV 2 M. Togawa

  3. Transverse Physics w/ FCAL? Beam Pipe 10 cm • Mandelstam t ~ pT2 ~(500*x/1800)2, so FCAL might extend the ability to study AN as a function of t • Question for Ming: Pion cloud? FCAL

  4. Trigger Requirements • Need two RBIBs for the Scintillator Veto (N and S) • Transverse Run • FCAL 4x4 trigger, prescaled • Intended to be used to study effect of veto • (FCAL 4x4&&!Scintillator) • Not prescaled, used for forward neutron AN • Longitudinal Run • (FCAL 4x4&&!Scintillator) as a relative luminosity monitor • Doesn’t need much bandwidth but needs to be scaled.

  5. Backup

  6. Does it Cover Enough Area? Veto Paddle • Each FCAL tower is 10x10 cm2,I think • The paddles we used were 20x60 cm^2 • Does anyone know if this will be effective as a veto? • Also, I think we want this as close to the beam-pipe as possible, but I am not sure if we get good energy reconstruction if we hit the left most column of towers. • So where do we want to put the paddle? • Should we get a bigger one?

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