1 / 27

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,

moswen
Télécharger la présentation

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

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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!!!

More Related