Download - Mass production (Super-K)
Mass production (Super-K)• Setup of jnubeam
– 3 horn 250 kA– 30-GeV proton beam of Gaussian distribution (sx,y = 0.4243 cm)– On center, parallel beam and no divergence.– Proton generation upstream of the baffle– Normalization for a file: 1.0 x 1021 POT– 1 x 105 POT/file x 100 files– Only use 100 good random seeds.– Store only SK ntuple w/ nominal variables.
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Mass production (INGRID)• Nominal setup of jnubeam
– 3 horn 250 kA– 30-GeV proton beam of Gaussian distribution (sx,y = 0.4243 cm)– On center, parallel beam and no divergence.– Proton generation upstream of the baffle– ND3: 10.44 x 1.44 m2 ND4: 1.44 x 10.44 m2
– Normalization for a file: 1.0 x 1021 POT– 5 x 104 POT/file x 200 files– Only use 200 good random seeds.– Store only ND3 and 4 ntuple w/ nominal variables.1. Nominal2. Nominal but shifted beam by +2mm in y direction.3. Nominal but flat beam of f36 mm4. Same as 3 but horn 0 kA
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Repository• Neutrino flux files
login.cc.kek.jp:/nfs/g/t2k/beam/mc/beamMC/flux10a/(Mirror1) icrhome6:/kam/work2/kodai/jnubeam/data_10a/(Mirror2) http://www.icrr.u-tokyo.ac.jp/~kodai/jnubeam/– There is a README describing the contents in the directory.
• Ntuple variables description– http://www.t2k.org/beam/NuFlux/FluxRelease/10a/NtpDef
• Main change is addition of the proton vector information
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Plots for Super-K
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nm energy spectrum at Super-K
10a (250 kA)
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nm energy spectrum at Super-K• Comparison btw 10a (320 kA), 09c and 07a.
• Geometry update of the 1st horn (09a 09b) increased the peak flux by about 4%.
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nm 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.
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q-p distr. of parent p+ at the target• Polar angle and momentum distr. at the production point in
the target for parent p+ whose daughter nm 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.
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ne energy spectrum at Super-K• Comparison btw 10a (250 kA) and 10a (320 kA).
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Ratio of ne to nm at Super-K
ne/nm = 0.43% at the nm spectrum peak
10a (250 kA)
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• Comparison btw 10a (320 kA) and 07a.
Ratio of ne to nm at Super-K
10a (320 kA) 07a
n e/n m = 0.35% at the n m spectrum peakn e/n m = 0.38% at the n m spectrum peak
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Parents of n at Super-Km+ m– p+ p– KL
0 K+ K–
nm 10a (250 kA) 0.014% 95.06% 0.10% 4.83%10a (320 kA) 0.013% 95.01% 0.10% 4.88%07a 0.014% 95.18% 4.80%
nm 10a (250 kA) 7.2% 86.5% 1.2% 5.1%10a (320 kA) 8.0% 85.8% 1.3% 4.9%07a 7.8% 87.2% 5.0%
ne 10a (250 kA) 54.1% 1.0% 13.1% 31.8%10a (320 kA) 53.1% 1.0% 12.7% 33.2%07a 53.7% 13.0% 33.3%
ne 10a (250 kA) 6.7% 0.45% 76.6% 16.3%10a (320 kA) 7.6% 0.41% 77.7% 14.2%07a 7.9% 77.3% 14.8%
• Few difference btw different horn currents and different versions.• K+
m3, K–m3, K0
m3 and p e ne decays are included in 10a.
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Decay pos. of parent p+/– of n at Super-K
cf. ct = 7.8 m (PDG)
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Decay pos. of parent p+/– of n at Super-K
• Mean decay point: 41 m from the target• ct from the fitting: 6.3 m (peak energy at z = 40-90 m: 1.6 GeV g: 11.4)
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Decay pos. of parent K+/– of n at Super-K
cf. ct = 3.7 m (PDG)
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Decay pos. of parent K+/– of n at Super-K
• Mean decay point: 28.9 m from the target• ct from the fitting: 3.2 m (peak energy at z = 40-90 m: 6 GeV g: 12.2)
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Plots for INGRID
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nm profile at INGRID
The horizontal The vertical
10a (250 kA) 10a (250 kA)
RMS: 284 cm RMS: 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%)
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nm profile at INGRID• Comparison btw 10a (250 kA) and 10a (320 kA).
The horizontal The vertical
Peak flux (/cm2/1021 POT):• (4.98±0.01) x 1013 @ 250 kA• (5.89±0.01) x 1013 @ 320 kA
Ratio = 0.846
Peak flux (/cm2/1021 POT):• (5.09±0.01) x 1013 @ 250 kA• (6.11±0.01) x 1013 @ 320 kA
Ratio = 0.833
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nm profile at INGRID• Comparison btw 10a (320 kA), 09c and 07a.
The horizontal The vertical
• Magnetic field in the horn inner conductors (09c 10a) increased the peak flux by about 2%.
* ND2 is used for 07a, 09c* ND2 is used for 07a, 09c
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nm energy spectrum at INGRID
The horizontal The vertical
10a (250 kA) 10a (250 kA)
Peak: (1.37±0.01) x 1012 @ 0.9-0.95 GeV Peak: (1.42±0.01) x 1012 @ 0.95-1.0 GeV
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nm energy spectrum at INGRID• Comparison btw 10a (250 kA) and 10a (320 kA) for the horizontal.
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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.
NDn
ND
ND
ND
nnnnn
n
n
n
SKn
SK
SK
SK
N
NNN
MMMM
MMMMMMMMMMMM
N
NNN
3
2
1
321
3332231
2232221
1131211
3
2
1
ProspectMass 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
q-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 nm goes to Super-K..• Comparison btw 10a (250 kA) and 10a (320 kA)
10a (250 kA) 10a (320 kA)
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Mom. distr. of parents of n at Super-K• 10a horn 250 kA
Parents of nm Parents of nm
Parents of neParents of ne
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Mom. distr. of parents of n at Super-K• 10a horn 250 kA
Parents of nm Parents of nm
Parents of neParents of ne
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Mom. distr. of parents of n at Super-K• Comparison btw 10a (250 kA) and 10a (320 kA).
Parent p+ of nm Parent m+ of ne
p+ mean momentum:• 2.72 GeV/c (10a 250 kA)• 2.70 GeV/c (10a 320 kA)
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Mom. distr. of parents of n at Super-K• Comparison btw 10a (320 kA), 09c and 07a.
Parent m+ of neParent p+ of nm
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nm energy spectrum at INGRID• Comparison btw 10a (250 kA) and 10a (320 kA) for the
vertical.
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nm energy spectrum at INGRID• Comparison btw 10a (320 kA), 09c and 07a for the horizontal.
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nm energy spectrum at INGRID• Comparison btw 10a (320 kA), 09c and 07a for the vertical.
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