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Horns, Hadron production etc. (from hadron production to neutrino beam)

200/9/26 NP02@Kyoto. Horns, Hadron production etc. (from hadron production to neutrino beam). A.K.Ichikawa KEK. Study on horns Changing n -beam energy Hadron production. Study on horns. 2.2m. Brief comment on the horn design status. Till now, in the beam MC simulation,

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Horns, Hadron production etc. (from hadron production to neutrino beam)

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  1. 200/9/26 NP02@Kyoto Horns, Hadron production etc. (from hadron production to neutrino beam) A.K.Ichikawa KEK • Study on horns • Changing n-beam energy • Hadron production

  2. Study on horns

  3. 2.2m Brief comment on the horn design status Till now, in the beam MC simulation, horns proposed in BNL-E889 was used. 1st horn • Din = 1.9cmf, I=250kA • Sapphire target (Al2O3, r=4g/cm3) D=0.64 cm, L=45cm c.f. K2K Din=3.0cmf, I=250kA In addition, heat load from radiation Need realistic design work

  4. p production –Model- Momentum and angle of p <q>=const.+const./<p> MARS 50GeV, graphite MARS 50GeV : q=0.038+0.31/p 30GeV : q=0.038+0.33/p GFLUKA+GCALOR 50GeV : q=0.023+0.33/p 30GeV : q=0.025+0.32/p FLUKA2000 50GeV : q=0.026+0.31/p 30GeV : q=0.033+0.31/p q=0.038+0.31/p

  5. >1.5GeV/c >1.7GeV/c Momentum region of p’s w/ BNL-type horn, 2.5°OAB p’s contributing En<1.2GeV

  6. 4.4m Scaling laws W/ fixed current, r x 2 L x 2, Wx2 to obtain same optics. Din = 1.8cmf 2.2m Din = 3.6cmf

  7. BNL-type horn1 OAB1o WBB w/ K2K horns Din = 1.8cmf K2K horn1 Din = 3cmf

  8. Inner conductor 4.6cmf I = 250 kA 2.5GeV 1.7GeV Target in the horn 1m 4m 3GeV 2GeV Target outside the horn 4m 1m 10m

  9. One idea for ‘1st horn’ 36kA/cm2 @t=4mm 24kA/cm2 @t=3mm cf. K2K 35kA/cm2 22cmf, I=500kA 6cmf, I=250kA 66cmf 1m 2.5m 1.4m Till now, only 60% flux have been achieved…..

  10. The other idea for ‘1st horn’ ~250kA, Din~4cmf ~500kA ~3m

  11. Heat Load from Radiation R Z Inner cond. Al t=4mm Air t=6mm 30mmf Water t=5mm Graphite r=1.8g/cm3 60mmf In the graphite target, 64kJ/3.3E14 protons in total R Z Dt~14o In total, 34kJ/3.3E14 protons = 10 kW @ 0.3Hz cf. K2K heat load in the target from the current = 1.4 kW (surface area ~x 7)

  12. Strategy to change peak energy

  13. Change the neutrino beam energy Unofficial Decay Volume Top view Side View To SK/HK OAB 2° OAB3°

  14. One method is changing the beam axis. The other…. OAB+Bending Magnet Dipole magnet gap 1m×1m×1m Oyabu’s talk

  15. Hadron production model

  16. jnubeam : neutrino beam simulation code • developed from K2K code • DV shape : incorporate actual shape • target & horns : still BNL-type. • calculation of n-flux at SK for all decays by weighting • Hadron production model • 1. Models built-in Geant3. e.g. GFLUKA.. • 2. Various models using Input via stdout | stdin. • > MARS | jnubeam • > FLUKA2000 | jnubeam

  17. GFLUKA MARS FLUKA2000 OAB2.5o Ep=50GeV Graphite 0.74cmf 45cm

  18. Comparison of different proton energy and different models @ OAB2.5o (Target is graphite but the dimension is BNL-type.) Absolute flux (En<1.5GeV) x107/cm2/yr ne #(ne)/#(nm En<1.5GeV)

  19. Comparison of different proton energy and different models @ OAB2.5o High Energy tail #(En>1.5GeV)/#(En<1.5GeV) NC #NC/#CC(En<1.5GeV)

  20. Effects on SK observable MARS 50 GeV !!!! Graphite 45cm !!!!!

  21. MARS 30 GeV !!!! Graphite 45cm !!!!!

  22. Pbeam=5~120 GeV/c From R.Raja, NUFACT02

  23. Summary or discussion item • Horns : realistic design • gathering ideas • Changing the beam energy • OAB vs OAB+bending • Hadron production • MIPP • (30 GeV vs 50 GeV)

  24. Supplement

  25. Types for the 1st horn (a) (b) (2nd horn) (m-factory) (d) (c) K2K, CERN, BNL MINOS

  26. Beam Direction For both SK and possible HK. Decay pipe

  27. Event rate at SK MARS 50GeV !!!Graphite 45cm target!!!

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