Core neutron measurement with sampling …apollo.lns.tohoku.ac.jp/workshop/c010/slides/016.pdf•...

17
Miki Sasaki ( Yamagata Univ.) 10 th Mar. 2015@ELPH Workshop C010 Core neutron measurement with sampling calorimeter “Cerberus” in neutral beam line for KOTO experiment

Transcript of Core neutron measurement with sampling …apollo.lns.tohoku.ac.jp/workshop/c010/slides/016.pdf•...

Page 1: Core neutron measurement with sampling …apollo.lns.tohoku.ac.jp/workshop/c010/slides/016.pdf• Measurement of KL beam to verify M.C. • Beam profile • Neutron, KL ,gamma flux

Miki Sasaki ( Yamagata Univ.)

10th Mar. 2015@ELPH Workshop C010

Core neutron measurement with sampling calorimeter

“Cerberus” in neutral beam line for KOTO

experiment

Page 2: Core neutron measurement with sampling …apollo.lns.tohoku.ac.jp/workshop/c010/slides/016.pdf• Measurement of KL beam to verify M.C. • Beam profile • Neutron, KL ,gamma flux

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°

Page 3: Core neutron measurement with sampling …apollo.lns.tohoku.ac.jp/workshop/c010/slides/016.pdf• Measurement of KL beam to verify M.C. • Beam profile • Neutron, KL ,gamma flux

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 ! …

Page 4: Core neutron measurement with sampling …apollo.lns.tohoku.ac.jp/workshop/c010/slides/016.pdf• Measurement of KL beam to verify M.C. • Beam profile • Neutron, KL ,gamma flux

• 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)

Page 5: Core neutron measurement with sampling …apollo.lns.tohoku.ac.jp/workshop/c010/slides/016.pdf• Measurement of KL beam to verify M.C. • Beam profile • Neutron, KL ,gamma flux

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

Page 6: Core neutron measurement with sampling …apollo.lns.tohoku.ac.jp/workshop/c010/slides/016.pdf• Measurement of KL beam to verify M.C. • Beam profile • Neutron, KL ,gamma flux
Page 7: Core neutron measurement with sampling …apollo.lns.tohoku.ac.jp/workshop/c010/slides/016.pdf• Measurement of KL beam to verify M.C. • Beam profile • Neutron, KL ,gamma flux

Beam profile measurement

K0L measurement core n, γ measurement

upstream

downstream

2009

Page 8: Core neutron measurement with sampling …apollo.lns.tohoku.ac.jp/workshop/c010/slides/016.pdf• Measurement of KL beam to verify M.C. • Beam profile • Neutron, KL ,gamma flux

n/γ separation

γn

(Fe 4mm+Scinti 3.7mm)/layer (Pb 4mm+Scinti 3.7mm)/layer

18X0,0.7λI 29X0,3.5λI

#1 #2 #3 #6#5#4

Page 9: Core neutron measurement with sampling …apollo.lns.tohoku.ac.jp/workshop/c010/slides/016.pdf• Measurement of KL beam to verify M.C. • Beam profile • Neutron, KL ,gamma flux

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

Page 10: Core neutron measurement with sampling …apollo.lns.tohoku.ac.jp/workshop/c010/slides/016.pdf• Measurement of KL beam to verify M.C. • Beam profile • Neutron, KL ,gamma flux

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)

Page 11: Core neutron measurement with sampling …apollo.lns.tohoku.ac.jp/workshop/c010/slides/016.pdf• Measurement of KL beam to verify M.C. • Beam profile • Neutron, KL ,gamma flux

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

Page 12: Core neutron measurement with sampling …apollo.lns.tohoku.ac.jp/workshop/c010/slides/016.pdf• Measurement of KL beam to verify M.C. • Beam profile • Neutron, KL ,gamma flux

Accidental event★on time event

np

★accidental event

nn

1 62 3 4 5

1 62 3 4 5

Page 13: Core neutron measurement with sampling …apollo.lns.tohoku.ac.jp/workshop/c010/slides/016.pdf• Measurement of KL beam to verify M.C. • Beam profile • Neutron, KL ,gamma flux

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

Page 14: Core neutron measurement with sampling …apollo.lns.tohoku.ac.jp/workshop/c010/slides/016.pdf• Measurement of KL beam to verify M.C. • Beam profile • Neutron, KL ,gamma flux

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

Page 15: Core neutron measurement with sampling …apollo.lns.tohoku.ac.jp/workshop/c010/slides/016.pdf• Measurement of KL beam to verify M.C. • Beam profile • Neutron, KL ,gamma flux

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.

Page 16: Core neutron measurement with sampling …apollo.lns.tohoku.ac.jp/workshop/c010/slides/016.pdf• Measurement of KL beam to verify M.C. • Beam profile • Neutron, KL ,gamma flux

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

Page 17: Core neutron measurement with sampling …apollo.lns.tohoku.ac.jp/workshop/c010/slides/016.pdf• Measurement of KL beam to verify M.C. • Beam profile • Neutron, KL ,gamma flux

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.