11-2 Volume of Prisms & Cylinders Mrs. Ballard & KL Schofield.
Core neutron measurement with sampling …apollo.lns.tohoku.ac.jp/workshop/c010/slides/016.pdf•...
Transcript of Core neutron measurement with sampling …apollo.lns.tohoku.ac.jp/workshop/c010/slides/016.pdf•...
Miki Sasaki ( Yamagata Univ.)
10th Mar. 2015@ELPH Workshop C010
Core neutron measurement with sampling calorimeter
“Cerberus” in neutral beam line for KOTO
experiment
Beam line for KOTOe±,µ±,π±,p...
30GeV protoncollimator
target(Ni/Pt)
sweeping magnet
experiment area
γ absorber
KL,n,γ
20m
x or y profile
halo
core
halo
# o
f ev
ent
mm
•Produce small size of neutral beam with collimation system (7.9µ str) •Small halo n •halo n/K0L = 0.70±0.05x10-3 (< 1.0x10-3) •halo n/core n = 2.70±0.11x10-5 ( ~1.0x10-5)
2
16°
KOTO schedule
• 2009 - construction of KL beam line at J-PARC
- beam survey
• 2010 - construction of CsI Calorimeter
- engineering run - beam survey
• 2011 - construction detecters
- engineering run ! …
• Measurement of KL beam to verify M.C.
• Beam profile
• Neutron, KL ,gamma flux and momentum
Beam survey experiment
momentum (GeV/c)0 2 4 6 8 10
P.O
.T.)
9in
tens
ity (/
0.01
GeV
/c/1
.0x1
0
-110
1
10
210
310
410
510neutron
L0K
a
neutron momentum
Beam line simulation by GEANT3
X (mm)-200-150-100 -50 0 50 100 150 200
P.O
.T.)
10In
tens
ity (/
mm
/1.0
x10
-210
-110
1
10
210
all particles
neutron
L0K
a
charged particles
X profile (T>0.01GeV,Z=21m)
Y (mm)-200-150-100 -50 0 50 100 150 200
P.O
.T.)
10In
tens
ity (/
mm
/1.0
x10
-210
-110
1
10
210
all particles
neutron
L0K
a
charged particles
Y profile (T>0.01GeV,Z=21m)
Sampling calorimeter Cerberus
(Fe 4mm+Scinti 3.7mm)/layer (Pb 4mm+Scinti 3.7mm)/layer
#1 #2 #3 #6#5#4
sensitive area : 40*40 cm2
(beam size 15*15 cm2)
sampling calorimeter to measure neutron flux and energy
18X0,0.7λI 29X0,3.5λI
Beam profile measurement
K0L measurement core n, γ measurement
upstream
downstream
2009
n/γ separation
γn
(Fe 4mm+Scinti 3.7mm)/layer (Pb 4mm+Scinti 3.7mm)/layer
18X0,0.7λI 29X0,3.5λI
nγ
#1 #2 #3 #6#5#4
Neutron trigger
#6R
#2R#2F
or
or...
43
21
87
65
beam
Front layer
Rear layer
n-triggermodule
• Modules are divided to the front and the rear layer. • n-trigger→(#2F || #2R || … || #6R) &! (#1F || #1R)
#1F256
1
478
3
#1R
Beam information
*100W,1kW,3kW→intensity of primary proton
target Ni Pt
γ abs 0cm 7cm 9cm 0cm 7cm 9cm
1kW ✓ - ✓ ✓ ✓✓
target Ptγ abs 0cm 7cm 9cm100W ✓ ✓ ✓1kW ✓ ✓ ✓3kW - ✓ -
★ Feb.01-03 2010 (1kW run)
★Oct. 2010 (Pt target run)
Entries 13609
Mean 30.83
RMS 41.7
Integral 1.361e+04
retime[16]-50 0 50 100 150 200
1
10
210
310
Entries 13609
Mean 30.83
RMS 41.7
Integral 1.361e+04retime[16] {(trig&2)==2&&tdc[16] < 4095}
Time distribution of start channel
1kW, Ni target, abs 7cm
cutcut
~40nsec
nsecontime
triggered by self timing
triggered by other start channel
accidentalaccidental
Accidental event★on time event
np
★accidental event
nn
1 62 3 4 5
1 62 3 4 5
0 200 400 600 800 1000 1200 1400
1
10
210
310
Accidental cut
MeV
even
tenergy deposit of Cerberus
w/o accidental cutw/ accidental cut
gEntries 67791Mean -2.388RMS 27.89
-100 -80 -60 -40 -20 0 20 40 60 80
-410
-310
-210
-110
gEntries 67791Mean -2.388RMS 27.89
hEntries 92163Mean 1.547RMS 10.97 • special low intensity
run
• 100 W
• # of primary proton -> 1.3×1011 protons/pulse
• ~ KEK PS intensity
100 W run
Pt target, abs 7cm
Time distribution of start channel
nsec
1kW 100 W
100 W run
Target Pt, γ abs 7cm,beam intensity 100W
even
ts/2
0MeV
/2.2
84×1
0^9P
.O.T
MeV
line→M.C
dot→red:data
total deposit energy
GEANT4 and 100W data are good agreement.
Measure the response function
16
K1.1BR
Hadron hall
• K1.1BR beam line(Nov. 2011 )
• Beam test by charged particles
• p pi+ e+ 0.4GeV~1.0GeV
• Now studying
• tune MC
0 20 40 60 80 100 120 140 160 180 200
-410
-310
-210
-110
1GeV π+
Cerberus #1 deposit energy
MC data
MeV
Summary!
!
• Neutral beam line for KOTO were constructed at J-PARC.
• Beam neutron were measured by sampling calorimeter “Cerberus”.
• It seems to be in good agreement MC with 100W data.
• Response function of Cerberus were measured by charged particles in K1.1BR beam line.