interaction length
DESCRIPTION
Interaction Length. A. Murakami. L = 38.83 (interaction length of proton in carbon by PDG) change of constant : means uncertainty of L (change 0.8, 0.9, 1.0, 1.1, 1.2) Flux is normalized at peak flux. Normalized Flux @SK. Flux × 30 for looking at the tail . - PowerPoint PPT PresentationTRANSCRIPT
Interaction Length
A. Murakami
• L = 38.83 (interaction length of proton in carbon by PDG)
• change of constant : means uncertainty of L (change 0.8, 0.9, 1.0, 1.1, 1.2)
• Flux is normalized at peak flux.
Normalized Flux @SK
There seems to be no difference...
Flux × 30 for looking at the tail
Flux × 15 for looking at the tail
Ratio of Normalized Flux @SK
zoom to 0~2 GeV
Diff. less than 3%
Diff. less than 5%
constant = 1.1, 1.2 vs 1.0
Ratio of Normalized Flux @SK
zoom around 0~2 GeV
Diff. less than 3%
Diff. more than 5%
constant = 0.9, 0.8 vs 1.0
Ratio of Normalized Flux @ND5
zoom around 0~2 GeV
constant = 1.2, 1.1 vs 1.0
Diff. less than 2%
Diff. less than 3%
Ratio of Normalized Flux @ND5
zoom around 0~2 GeV
constant = 0.9, 0.8 vs 1.0
Diff. less than 2%
Diff. less than 5%
Far / Near constant=1.0, 1.1, 1.2
zoom around 0~2 GeV
There seems to be no difference...
Far / Near constant=1.0, 0.9, 0.8
zoom around 0~2 GeV
There seems to be no difference...
Comparison of Far/Near constant=1.0, 1.1, 1.2
zoom around 0~2 GeV
Diff less than 2%
Diff less than 3%
Comparison of Far/Near constant=1.0, 0.9, 0.8
zoom around 0~2 GeV
Diff less than 2%
Diff less than 4%
Out-target/In-target comparison
A. MurakamiConfirmation of Nicolas’s study
Zoom
Zoom
Zoom
Zoom
Diff between “out” and “total”< 6%
Primary beam profile
A. Murakami
Black : nominal beam profileBlue : Flat beamRed : pencil beam
Y-Scale × 40
2020
ZOOM
2121
ZOOM
2222
ZOOM
2323
ZOOM
24
Z binning studybinning target exit z position
A. Murakami
25
Simple simulation by
either geant3, mars, fluka, geant4 ……
Target is just a 90cm, 2.6cm-diameter rod.
Vector information of particles just exit the target is output.
Normal use for model comparison30GeV proton In jnubeam
Generate and trace the track inputted.
Vector
information
Simple simulation by geant3
Target is just a 90cm, 2.6cm-diameter rod.
Vector information of particles just exit the target is output. But ‘z’ value is modified to simulate the binning condition.
This study30GeV proton In jnubeam
Generate and trace the track input.
Vector
information‘one bin’ case
12/)sizebin (z
2727
2828
2929
ZOOM
3030
ZOOM
31
Secondary interaction in Horn Aluminum
A. Murakami
32
Super-K ND off-axis
Red: remove horn aluminumBlack : nominal
3333
3434
3535
3636
ASSUMED condition(ad hoc)
Abs. flux
Flux shape
Far/Near
Trans. Matrix
remakes
primary Gfluka v.s. gheisha
35% <10% Sakashita
primary Gfluka v.s. K2K-SW
30% 10% Sakashita
Prod. Point (Z) Dz=18cm(=18/sqrt(12))
4% 3% Murakami
Interaction length 20% 7% 4% Murakami
Second. Had.prod. Gfluka v.s. gclaor
15% <3% Sakashita
Sec. intr. in horn Al 20% uncertainty
6%6%
2%2%
Murakami30% absorption
Out target inter. 20% uncertainty
5%5%
2% Nicolas/Murakami10~30% out of total
Indirect contr. Nicolas
Upper number: 0.4<En<1.2GeV regionLower number : En<10GeV
Prim
ary
inte
racti
onSe
cond
ary
Inte
racti
on
Upper number: 0.4<En<1.2GeV regionLower number : En<10GeV
Cont’d
ASSUMED condition(ad hoc)
Abs. flux
Flux shape
Far/Near
Trans. Matrix
remakes
Pbeam profile No profile info. 10%12%
5% Murakami
Pbeam position shift
Josh
Pbeam angle shift
Horn alignment Josh
Horn current Josh
Horn field asym. 10% 8% Eric
Prim
ary
Beam
Horn