beam mc progresses for beam mc sub-group. summary of update in 09b,c,10a 09b geometry of baffle,...
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Summary of update in 09b,c,10a09b• 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
Horn Magnetic FieldHow 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 foundModest effect on neutrino flux
K. Matsuoka
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2 22
220
ab
ar
r
IB
r
B
Inner conductor
Realistic. B-field
2D Gaussian fit Peak flux (/cm2)* x (cm) y (cm)
Max. B-field (8.74±0.03) x 107 96.4±0.8 98.7±0.9
Realistic B-field (8.09±0.03) x 107 99.0±0.9 102.1±1.0
Min. B-field (7.41±0.03) x 107 102.4±1.0 104.7±1.0
0 kA (1.48±0.02) x 107 156±11 154±10
(* per 3.3 x 1014 POT)
8~9% effect. (difference from realistic B field)
mag. field inside inner conductor-MUMON, all horns on-
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
mag. field inside inner conductor E spectra (SK)
Red: Max.Black: RealisticBlue: Min.
Red: Max./realisticBlue: Min./realistic
<3% effect (need more statistics)
All
mag. field inside inner conductor E spectra (ND on-axis)
(Error bars may be under-estimated.See later slides.)
All
Red: Max.Black: RealisticBlue: Min.
Red: Max./realisticBlue: Min./realistic
mag. field inside inner conductor INGRID profile
All
Red: Max.Black: RealisticBlue: Min.
All
Red: Max.Black: RealisticBlue: Min.
abs(x) ≤ 5.5 m && abs(y) ≤ 0.5 m
ND2 ND2
abs(x) ≤ 0.5 m && abs(y) ≤ 5.5 m
Due to the magnetic field in the inner conductors, 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
Horn2 and Horn3 Geometry updateupdate 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
H.Kubo
http://jnusrv01.kek.jp/Indico/getFile.py/access?contribId=0&resId=0&materialId=slides&confId=147
Horn2&3 geometry updatemuon flux @mumon (Si-plane, horn 320kA)
• flux decreased by 3%, profile shape is same
muon peak flux (cm-2) sigma X [cm] sigma Y [cm]
09b 7.2 x 10 4 101 ± 1 104 ± 1
new horn geom. 6.9 x 10 4 102 ± 1 105 ± 1
3horns, 320kA @3.4x1011POT
Parents of muons in muon pit-K/pi ratio-
entries (/5x10^7 POT) Ratio (K / Pi)
horn current pion (+/-)
K(all) K0 K+ K- K(all) K0 K+ K-
0kA 64981 5441 172 4548 721 0.084 0.003 0.070 0.011
273kA , 1st horn only
101623 8327 189 7466 672 0.082 0.002 0.073 0.007
320kA , 3horns 259030 15861 206 15157 498 0.061 0.001 0.059 0.002
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.
K. Matsuoka
x (mm) x (mm) Peak flux (/cm2)* x (cm) y (cm) x (cm) y (cm)
Weight 0 3.6 (2.81±0.02) x 104 1.0±1.0 0.9±0.7 137±4 129±3
Normal 0 3.6 (2.84±0.02) x 104 1.6±1.1 1.7±1.1 133±4 132±4
Weight 5 3.6 (2.84±0.02) x 104 –4.3±1.6 0.9±0.9 169±6 128±3
Normal 5 3.6 (2.87±0.02) x 104 –7.9±1.7 1.8±1.0 162±6 128±3
Weight 5 1.7 (2.82±0.02) x 104 –11.8±2.4 0.9±1.3 166±9 128±4
Normal 5 1.7 (2.83±0.02) x 104 –8.9±1.6 0.8±1.1 154±5 132±4
Demonstration w/ MUMON profile
y: 1.7 mm(* +–/3.4 x 1011 POT)
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)
N. Abgrall
http://jnusrv01.kek.jp/Indico/getFile.py/access?contribId=4&resId=0&materialId=slides&confId=133
new ND flux calculation algorithm• current filling routine
– SK : treated as a “point”. for every decay of /K/, 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.1. choose a detection point (x, y) randomly in the ND plane2. 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.
H.Kubo
http://jnusrv01.kek.jp/Indico/getFile.py/access?contribId=0&resId=0&materialId=slides&confId=162
Enu
• spectrum seems to be consistent• χ2 = 19.7 / 39
– to small– due to using same set of parents ?
error histogram (Enu)
• low energy (< 1GeV) : same or smaller error• Original method had been giving underestimated error
originalnew
on-axis xnu (fitting)
• fit with Gaussian– large chi2 & mean offset (10 sigma) in original algorism
indicates under estimation of error
original new
χ2 / ndf 867 / 17 21.0 / 17
mean -1.57 ± 0.16 cm -2.0 ± 3.5 cm
sigma 568 ± 0.4 cm 556 ± 8 cm
original new
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.Sakashitahttp://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
ProspectFlux 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 currentRemaining update• Striplines• Transfer matrix with new ND280 algorithm• Inclusion of NA61 results w/ NA61-T2K group• And studies.
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
mag. field inside inner conductor-MUMON,1st horn only-
Primary proton profilex= 0.36, y= 0.17 (mm) Only Horn1same as April ’09 commissioning
Peak flux* x(cm) y(cm)
273 kA (min.B-field) (2.76+/-3) x 104 135+/-6 131+/-5
273 kA (realistic B-field) (2.99+/-3) x 104 129+/-5 121+/-4
273 kA (max. B-field) (3.15+/-3) x 104 125+/-4 120+/-4
0 kA (1.53+/-2) x 104 156+/-11 154+/-10
http://jnusrv01.kek.jp/Indico/getFile.py/access?contribId=1&resId=0&materialId=slides&confId=152
(*per 3.4x1011 POT, 2D fit peak)
A few % effect
Horn2&3 geometry updatepion production point (mumon)
horn1horn2
horn3 horn1
horn2
horn3 dump
target & horn1( -510 < Z < -350)
horn2(-300 < Z < -100)
horn3(350 < Z < 650)
266 0.8 0.7
09bnew
103entries / 5.0 x 107 POT
Horn2&3 geometry updateeffect of horn2&3 material
total(<10GeV) peak(/50MeV)
w/Horn2&3 material 1.21x107 1.28x106
w/o horn2&3 material 1.33x107 1.48x106
absorption ~ 10% (14%@ peak)
less effect than horn1
Horn2&3 geometry update
pions whose daughter muons goes through mumon Si-plane
horn 320kA
horn [kA] charged muons
0, 0, 0 1.99 1.68
320, 0, 0 3.68 3.15
320, 320, 0 4.84 4.15
320, 320, 320 7.94 6.92
particle flux [104 / cm2 / 3.4 x 1011POT] @MUMON Si-plane ( peak of X projection-fit )
Comaprison Emulsion, Si, MC
31
Horn current
Shot #
Proton (CT05)
Emulsion (trk/cm2)
Si (pC)
Em/Si(trk/pC)
MC July
Em/MC July
MC Sep
Em/MC Sep
MC 09cEmu
Em/MC09c Emu
273kA 1034 3.73 x1011
2.16 +- 0.03x104
174 124 4.25 x 104
0.51 2.79x 104
0.77 2.77x 104
0.78
220kA 1170 3.77 x1011
1.61 +- 0.02x104
128 128 - - 2.26 x 104
0.71 2.15x 104
0.75
0kA 1147 3.71 x1011
1.00+- 0.02x104
77 130 1.76 x 104
0.57 1.76 x 104
0.57 1.74x 104
0.57
Proton : from beam summary (result_run24.root)Emulsion : cutoff 0.05GeV/c, <0.3radSi : using only 1 line (7 sensors) which corresponds
emulsion modules.MC : muon, position at emulsion,
momentum>0.05GeV/c, <0.3radnormalized by Proton(CT05).
Normalized at POT=3.4e11
Review on gcalorConsists 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
H.Kubo
For more details, http://jnusrv01.kek.jp/Indico/getFile.py/access?contribId=2&resId=0&materialId=slides&confId=133