Mass production (Super-K) Setup of jnubeam – 3 horn 250 kA – 30-GeV proton beam of Gaussian distribution (  x,y = cm) – On center, parallel beam and no divergence. – Proton generation upstream of the baffle – Normalization for a file: 1.0 x POT – 1 x 10 5 POT/file x 100 files – Only use 100 good random seeds. – Store only SK ntuple w/ nominal variables. K. Matsuoka

Mass production (INGRID) Nominal setup of jnubeam – 3 horn 250 kA – 30-GeV proton beam of Gaussian distribution (  x,y = cm) – On center, parallel beam and no divergence. – Proton generation upstream of the baffle – ND3: x 1.44 m 2 ND4: 1.44 x m 2 – Normalization for a file: 1.0 x POT – 5 x 10 4 POT/file x 200 files – Only use 200 good random seeds. – Store only ND3 and 4 ntuple w/ nominal variables. 1.Nominal 2.Nominal but shifted beam by +2mm in y direction. 3.Nominal but flat beam of  36 mm 4.Same as 3 but horn 0 kA K. Matsuoka

Repository Neutrino flux files login.cc.kek.jp:/nfs/g/t2k/beam/mc/beamMC/flux10a/ (Mirror1) icrhome6:/kam/work2/kodai/jnubeam/data_10a/ (Mirror2) – There is a README describing the contents in the directory. Ntuple variables description – Main change is addition of the proton vector information K. Matsuoka

Plots for Super-K K. Matsuoka

 energy spectrum at Super-K 10a (250 kA) K. Matsuoka

 energy spectrum at Super-K Comparison btw 10a (320 kA), 09c and 07a. Geometry update of the 1 st horn (09a  09b) increased the peak flux by about 4%. K. Matsuoka

 energy spectrum at Super-K Comparison btw 10a (250 kA) and 10a (320 kA). Due to the less horn focusing w/ 250 kA, the lower energy neutrinos below 1 GeV decrease, while the higher energy neutrinos increase. K. Matsuoka

 -p distr. of parent  + at the target Polar angle and momentum distr. at the production point in the target for parent  + whose daughter  goes to Super-K.. Comparison btw 10a (250 kA) and 10a (320 kA) 10a (250 kA) 10a (320 kA) The horns comes to collect pions w/ lower momenta and larger angles when the current increases. K. Matsuoka

e energy spectrum at Super-K Comparison btw 10a (250 kA) and 10a (320 kA). K. Matsuoka

Ratio of e to  at Super-K e /  = 0.43% at the  spectrum peak 10a (250 kA) K. Matsuoka

Comparison btw 10a (320 kA) and 07a. Ratio of e to  at Super-K 10a (320 kA) 07a e /  = 0.35% at the  spectrum peak e /  = 0.38% at the  spectrum peak K. Matsuoka

Parents of at Super-K ++ –– ++ –– KL0KL0 K+K+ K–K–  10a (250 kA)0.014%95.06%0.10%4.83% 10a (320 kA)0.013%95.01%0.10%4.88% 07a0.014%95.18%4.80%  10a (250 kA)7.2%86.5%1.2%5.1% 10a (320 kA)8.0%85.8%1.3%4.9% 07a7.8%87.2%5.0% e 10a (250 kA)54.1%1.0%13.1%31.8% 10a (320 kA)53.1%1.0%12.7%33.2% 07a53.7%13.0%33.3% e 10a (250 kA)6.7%0.45%76.6%16.3% 10a (320 kA)7.6%0.41%77.7%14.2% 07a7.9%77.3%14.8% Few difference btw different horn currents and different versions. K +  3, K –  3, K 0  3 and   e e decays are included in 10a. K. Matsuoka

Decay pos. of parent  +/ – of at Super-K cf. c  = 7.8 m (PDG) K. Matsuoka

Decay pos. of parent  +/ – of at Super-K Mean decay point: 41 m from the target c  from the fitting: 6.3 m (peak energy at z = m: 1.6 GeV  : 11.4) K. Matsuoka

Decay pos. of parent K +/ – of at Super-K cf. c  = 3.7 m (PDG) K. Matsuoka

Decay pos. of parent K +/ – of at Super-K Mean decay point: 28.9 m from the target c  from the fitting: 3.2 m (peak energy at z = m: 6 GeV  : 12.2) K. Matsuoka

Plots for INGRID K. Matsuoka

 profile at INGRID The horizontalThe vertical 10a (250 kA) RMS: 284 cmRMS: 285 cm The difference of the peak flux btw ND3 and 4 is due to the difference of the z-position. (ND3 is located 4-m downstream of ND4; (230/234)^2 = 96.6%) K. Matsuoka

 profile at INGRID Comparison btw 10a (250 kA) and 10a (320 kA). The horizontalThe vertical Peak flux (/cm 2 /10 21 POT): (4.98 ±0.01 ) x kA (5.89 ±0.01 ) x kA Ratio = Peak flux (/cm 2 /10 21 POT): (5.09 ±0.01 ) x kA (6.11 ±0.01 ) x kA Ratio = K. Matsuoka

 profile at INGRID Comparison btw 10a (320 kA), 09c and 07a. The horizontalThe vertical Magnetic field in the horn inner conductors (09c  10a) increased the peak flux by about 2%. * ND2 is used for 07a, 09c K. Matsuoka

 energy spectrum at INGRID The horizontalThe vertical 10a (250 kA) Peak: (1.37 ±0.01 ) x GeVPeak: (1.42 ±0.01 ) x GeV K. Matsuoka

 energy spectrum at INGRID Comparison btw 10a (250 kA) and 10a (320 kA) for the horizontal. K. Matsuoka

Random number generation - H. Kubo- For mass production, we are already facing duplication problem of random numbers. In 10a version, 215 default(good-separated) seed pairs are used. -> We found that the separation is not enough. For the moment, another independent random number generator is implemented to avoid duplication of events. For the next mass production, – better way of seeds generation (already method is proposed.) – save seeds for each event

Transfer matrix -K. Sakashita - With New ND-fill algorithm, it became easy to get a correspondence of parent pion/K for near detectors and Super-K. -> transfer matrix can be constructed easily.

Prospect Mass production Flux for Off-axis magnet region will be prepared soon as ND6 Flux for Off-axis basket region will follow. Development till April Transfer matrix Remaining geometry update some technical upgrade – random numbers – root output Study till April Clarify beam-related systematic errors based on the commissioning result. Next flux mass production would happen on ~April

supplement

 -p distr. of parent K + at the target Polar angle and momentum distr. at the production point in the target for parent K + whose daughter  goes to Super-K.. Comparison btw 10a (250 kA) and 10a (320 kA) 10a (250 kA) 10a (320 kA) K. Matsuoka

Mom. distr. of parents of at Super-K 10a horn 250 kA Parents of  Parents of e K. Matsuoka

Mom. distr. of parents of at Super-K 10a horn 250 kA Parents of  Parents of e K. Matsuoka

Mom. distr. of parents of at Super-K Comparison btw 10a (250 kA) and 10a (320 kA). Parent  + of  Parent  + of e  + mean momentum: 2.72 GeV/c (10a 250 kA) 2.70 GeV/c (10a 320 kA) K. Matsuoka

Mom. distr. of parents of at Super-K Comparison btw 10a (320 kA), 09c and 07a. Parent  + of e Parent  + of  K. Matsuoka

 energy spectrum at INGRID Comparison btw 10a (250 kA) and 10a (320 kA) for the vertical. K. Matsuoka

 energy spectrum at INGRID Comparison btw 10a (320 kA), 09c and 07a for the horizontal. K. Matsuoka

 energy spectrum at INGRID Comparison btw 10a (320 kA), 09c and 07a for the vertical. K. Matsuoka