mass production (super-k)
DESCRIPTION
Mass production (Super-K). K. Matsuoka. Setup of jnubeam 3 horn 250 kA 30-GeV proton beam of Gaussian distribution ( s x,y = 0.4243 cm) On center, parallel beam and no divergence. Proton generation upstream of the baffle Normalization for a file: 1.0 x 10 21 POT - PowerPoint PPT PresentationTRANSCRIPT
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.
K. Matsuoka
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
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) 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
K. Matsuoka
Plots for Super-K
K. Matsuoka
nm energy spectrum at Super-K
10a (250 kA)
K. Matsuoka
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%.
K. Matsuoka
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.
K. Matsuoka
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.
K. Matsuoka
ne energy spectrum at Super-K• Comparison btw 10a (250 kA) and 10a (320 kA).
K. Matsuoka
Ratio of ne to nm at Super-K
ne/nm = 0.43% at the nm spectrum peak
10a (250 kA)
K. Matsuoka
• 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
K. Matsuoka
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.
K. Matsuoka
Decay pos. of parent p+/– of n at Super-K
cf. ct = 7.8 m (PDG)
K. Matsuoka
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)
K. Matsuoka
Decay pos. of parent K+/– of n at Super-K
cf. ct = 3.7 m (PDG)
K. Matsuoka
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)
K. Matsuoka
Plots for INGRID
K. Matsuoka
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%)
K. Matsuoka
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
K. Matsuoka
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
K. Matsuoka
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
K. Matsuoka
nm 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.
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)
K. Matsuoka
Mom. distr. of parents of n at Super-K• 10a horn 250 kA
Parents of nm Parents of nm
Parents of neParents of ne
K. Matsuoka
Mom. distr. of parents of n at Super-K• 10a horn 250 kA
Parents of nm Parents of nm
Parents of neParents of ne
K. Matsuoka
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)
K. Matsuoka
Mom. distr. of parents of n at Super-K• Comparison btw 10a (320 kA), 09c and 07a.
Parent m+ of neParent p+ of nm
K. Matsuoka
nm energy spectrum at INGRID• Comparison btw 10a (250 kA) and 10a (320 kA) for the
vertical.
K. Matsuoka
nm energy spectrum at INGRID• Comparison btw 10a (320 kA), 09c and 07a for the horizontal.
K. Matsuoka
nm energy spectrum at INGRID• Comparison btw 10a (320 kA), 09c and 07a for the vertical.
K. Matsuoka