Kaons%20in%20the%20SPL%20Superbeam

1
Kaons in the SPL Superbeam

• Antoine Cazes
• Laboratoire de Laccélérateur Linéaire

2
Energy increase?

• Nominal energy of the SPL 2.2GeV/c
• Maybe increase up to 4-5GeV/c (?)
• Better focusing
• Higher pions production
• This implies the study of many issues
• What is the flux of kaons
• What changes in the signal/noise
• Which is the best energy?
• Simulation of proton-target interaction
• The simulation chain for the energy optimization

3
The simulation

• FLUKA 2002.4
• 500 000 pot
• kinetic energy T 2.2 5 GeV (uniformaly
  distributed)
• target
• Liguid Mercury (A200.59, Z80, r13.546,
  X00.2756)
• ? 1.5cm
• L 30cm (2l)
• Particles are recorded when they exit the target

4
kaon production at the exit of the target
Number for 500 000 pot

• Two production processes (origin?)
• Anyway below 4 GeV, K production lt 300 times the
  p production.
• neutrino production associated to K seams to be
  negligeable.

5
kaons angular distribution
6
The simulation chain
p
p
Fluka
Geant 3
1) Proton interaction on target
2) Secondary particles tracking into the horn
Nufact-Note 134
p
n
q13 limit
analysis input?
geometry?
3) decay tunnel
4) Flux at Fréjus
5) Analysis
We need informations to complete the chain
7
Conclusion

• Kaons may not be a problem MARS?
• To optimize q13 sensitivity
• we could change the SPL energy
• we need therfore retune the horn design
• but
• Pieces are missing in the simulation
• the decay tunnel part
• A short note is available for whom is interested