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Beam MC progresses

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  1. Beam MC progresses for beam MC sub-group

  2. Summary of update in 09b,c,10a 09b • Geometry of baffle, target, 1st horn, dump and MUMON is updated. 09c • MUMON structures were included. • Energy deposit in the MUMON detector can be stored. • Emittance and Twiss parameters via card. 10a to be released soon • Horn2&3 geometry update • Mag. field inside inner conductor • Store primary proton vector information to enable weighting method • New ND280 flux algorithm • Store particle interaction history • K±µ3 and K0µ3 decay for neutrino • Random number generation seeds control

  3. K. Matsuoka Comparison among different versions

  4. A.K.Ichikawa T2K horn effect (jnubeam 09c) X9.4 x16 On-axis Off-axis

  5. K. Matsuoka Horn Magnetic Field How should we treat the magnetic field inside the inner conductor? Horn1 inner conductor Inner radius = 2.7cm, outer radius=3cm Assuming that the elec. current is uniform in the conductor, (skin depth > 5mm) Significant effect on MUMON signal was found Modest effect on neutrino flux Realistic. B-field B r Inner conductor

  6. mag. field inside inner conductor-MUMON, all horns on- (* per 3.3 x 1014 POT) 8~9% effect. (difference from realistic B field) • Max. B-field • 1/r-shape field starts from inner surface of the inner conductor • Min. B-field • starts from the outer surface of the inner condcutor

  7. mag. field inside inner conductor En spectra (SK) Red: Max./realistic Blue: Min./realistic All nm Red: Max. Black: Realistic Blue: Min. <3% effect (need more statistics)

  8. mag. field inside inner conductor En spectra (ND on-axis) Red: Max./realistic Blue: Min./realistic All nm Red: Max. Black: Realistic Blue: Min. (Error bars may be under-estimated.See later slides.)

  9. mag. field inside inner conductor INGRID profile ND2 All nm ND2 All nm Red: Max. Black: Realistic Blue: Min. Red: Max. Black: Realistic Blue: Min. abs(x) ≤ 5.5 m && abs(y) ≤ 0.5 m abs(x) ≤ 0.5 m && abs(y) ≤ 5.5 m • Due to the magnetic field in the inner conductors, n flux at ND on the axis gets sharper than that of 09c (min B-field). • Peak value: (min) 5.66 x 1017 (realistic) 5.79 x 1017 /m2/1021 POT

  10. H.Kubo Horn2 and Horn3 Geometry update update from conceptual shape to real shape • Horn2 • outer conductor radius : 40 cm -> 49.048 cm • B-field region (Z-length) : 200 cm ->199.7 cm • Horn3 • outer conductor radius : 70 cm  65.5 cm http://jnusrv01.kek.jp/Indico/getFile.py/access?contribId=0&resId=0&materialId=slides&confId=147

  11. Horn2&3 geometry updatemuon flux @mumon (Si-plane, horn 320kA) • flux decreased by 3%, profile shape is same 3horns, 320kA @3.4x1011POT

  12. Horn2&3 geometry updateneutrino flux 09b new less than 5% difference upto 5GeV nm@SK Far/Near

  13. Parents of muons in muon pit-pions- Horn off 1st Horn 273kA All horns 320kA H.Kubo. K.Matsuoka

  14. Parents of muons in muon pit-kaons- Horn off 1st Horn 273kA All horns 320kA H.Kubo. K.Matsuoka

  15. Parents of muons in muon pit-K/pi ratio-

  16. K. Matsuoka Proton information • Store primary beam information • Accumulate POT w/ a flat proton beam and weight t w/ an arbitrary proton profile to simulate that profile • No need to make many MC data sets of various proton beam profile. Demonstration w/ MUMON profile (* m+–/3.4 x 1011 POT) sy: 1.7 mm

  17. N. Abgrall Production history • Fill ntuples with neutrino history, taking decay chains into account. • information of primary, secondary,...interactions) • Include additional decay modes for pions and kaons, updated branching ratios • π± → e± νe • K±µ3 and K0µ3 • neglect K0S semileptonic decays ? (e.g. K2K case) http://jnusrv01.kek.jp/Indico/getFile.py/access?contribId=4&resId=0&materialId=slides&confId=133

  18. H.Kubo new ND flux calculation algorithm • current filling routine • SK : treated as a “point”. for every decay of p/K/m, neutrino is forced to go towards SK probability is calculated and stored as “norm”. • ND : repeat parent’s decay randomly (uniformly in CM) by 1,000 times only neutrinos which have proper angle are filled. • New method : same method as SK case. • choose a detection point (x, y) randomly in the ND plane • calculate weight (acceptance) for this direction • Motivation • In the current version, high-energy pions are multiply used. Events are not independent. Simple error couting results in underestimate. http://jnusrv01.kek.jp/Indico/getFile.py/access?contribId=0&resId=0&materialId=slides&confId=162

  19. Enu • spectrum seems to be consistent • χ2 = 19.7 / 39 • to small • due to using same set of parents ?

  20. error histogram (Enu) • low energy (< 1GeV) : same or smaller error • Original method had been giving underestimated error original new

  21. on-axis xnu (fitting) • fit with Gaussian • large chi2 & mean offset (10 sigma) in original algorism indicates under estimation of error original new

  22. Other activity • Detailed check of dimensions by P.Perio • Treatment of Random numbers • M.Hartz, K.Sakashita • code is modified to select 215 good seed-pairs for GRNDM by K.Sakashita http://jnusrv01.kek.jp/Indico/getFile.py/access?contribId=2&resId=0&materialId=slides&confId=155 • OTR simulation by OTR group • Target scan simulation • K.Matsuoka, M.Hartz • CPU saving effort • Review on gcalor (secondary interaction model) • Review on INGRID study A.Minamino

  23. Prospect Flux Mass production • Received requests from ND280 beam group • Need to be done • Implementation of the correct ND280 position • Optimization of proton beam area • two flat area? • Release 10a • In Next week at 250kA horn current Remaining update • Striplines • Transfer matrix with new ND280 algorithm • Inclusion of NA61 results w/ NA61-T2K group • And studies.

  24. Other geometry update • MUMON structure has been added. • Geometry of the collimator at the entrance of DV has been update based on the measurement. • The size of the DV entrance has been changed based on the measurement. • Density of dump material • concrete from 2.2 to 2.3 g/cm3 • ~1% effect on MUMON • concrete rebars 2.3g/cm3 -> 2.377 g/cm3 • <1% effect on MUMON

  25. mag. field inside inner conductor-MUMON,1st horn only- Primary proton profile sx= 0.36, sy= 0.17 (mm) Only Horn1 same as April ’09 commissioning (*per 3.4x1011 POT, 2D fit peak) A few % effect http://jnusrv01.kek.jp/Indico/getFile.py/access?contribId=1&resId=0&materialId=slides&confId=152

  26. Horn2&3 geometry updatepion production point (mumon) horn1 09b new horn3 horn2 horn1 horn2 dump horn3 103entries / 5.0 x 107 POT

  27. Horn2&3 geometry updateeffect of horn2&3 material absorption ~ 10% (14%@ peak) less effect than horn1

  28. Horn2&3 geometry update horn 320kA pions whose daughter muons goes through mumon Si-plane particle flux [104 / cm2 / 3.4 x 1011POT] @MUMON Si-plane ( peak of X projection-fit )

  29. A.Ariga et. al. Muon flux at muon pitEmulsion v.s. MC

  30. Comaprison Emulsion, Si, MC Proton : from beam summary (result_run24.root) Emulsion : cutoff 0.05GeV/c, q<0.3rad Si : using only 1 line (7 sensors) which corresponds emulsion modules. MC : muon, position at emulsion, momentum>0.05GeV/c, q<0.3rad normalized by Proton(CT05). Normalized at POT=3.4e11

  31. M.Hartz Target scan Data for y scan

  32. H.Kubo Review on gcalor Consists of : • NMTC : nucleons < 3.5GeV, π±< 2.5GeV • SCALE : Scaling Model (3GeV to 10GeV) • MICAP : neutron < 20MeV • (FLUKA) : >10GeV & other particles NMTC & Scaling • For nucleons below 3.5GeV and π±below 2.5GeV, NMTC is used. • Above 10GeV, FLUKA is used. • Scaling energy range (3-10GeV) • FLUKA or (scaled)NMTC is called for each interaction with a linear probability function for smooth transition For more details, http://jnusrv01.kek.jp/Indico/getFile.py/access?contribId=2&resId=0&materialId=slides&confId=133

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