OPERA experiment and Emulsion technique

Akitaka Arigaariga@flab.phys.nagoya-u.ac.jp

Nagoya universityOn behalf of OPERA collaboration

1. Neutrino interaction vertex location method2. Large area scanning system

3. Vertex location system4. PEANUT experiment

5. Emulsion spectrometer6. summary

CERN to Gran Sasso, neutrino beam

Gran Sasso 地下研究所

CERN SPS

730km

Vertex locationSampling by Target Tracker planes ( X,Y )

Brick wall

10 c

m

Selected brick

Event as seen by the target tracker

p.h.

Extract selected brick  

ECC brick

8 cm

CS

CSVery low bg emulsion

ECCbrick

１０ｃｍ 2.6 ｃｍ

Event as seen by the target tracker

p.h.

Target Tracker

ECC Target tracker

Basic unit of Detector x 200,000

ECCCS

TTCSECC

Large area scan~100cm2

Point Scan~100x100m2

Vertex location procedure

Lead

emul

sion

Lead

emul

sion

Lead

emul

sion

Lead

emul

sion

Lead

emul

sion

Lead

emul

sion

Lead

emul

sion

emul

sion

emul

sion

Scanback method

neutrino

S-UTS Video

Non-stop tomographic image taking(follow shot method)

pixelHigh speed CMOS

focus

~100 micron

~60micron

Emulsion layer (Stage)

Drive object lens by piezo actuator30~100Hz

Objective lens

Processing speed :

Up to 70cm2/h/board

SUTS Track recognition board

Internal Band width 21Gbyte/s/FPGA

×11

S-UTS data flow.

Raw data

Data Base

150~300MB/s

2~10MB/s

High speed Camera 3,000 frame/s

Front end image processor0 suppression, pixel packing

Track recognition

DAQ

Pipe line processing Noise rejection Vertex reconstruction

2~10MB/s~0.1MB/s

USERs

1.3GB/s

角度精度 ： 15 mrad位置精度 ： 0.9 micron

10cm

12.5cm

Total ~100,000,000 tracks

Rock mu track from CNGS 2006 run

600micron16

0mic

ron

X Z

Hits on electric detectorsCS view

TTCSECC

Large area scan~100cm2

Point Scan~100x100m2

Vertex location procedure

Lead

emul

sion

Lead

emul

sion

Lead

emul

sion

Lead

emul

sion

Lead

emul

sion

Lead

emul

sion

Lead

emul

sion

emul

sion

emul

sion

ScanBack system

How many plates in 1 day?=20bricks * 57 plates = 1140 plates.

Plate Changer Video

ScanBack

OPERA location system has been tested and ready for the run.

600micron

160m

icro

n

ECC 57plate

CS

Rock mu from 2006 CNGS run. Scanback has been finished in 1 hour.

An application of S-UTS : PEANUT

• ECC + Counter Hybrid target

• Same ECC structure as OPERA

• Precision measurement for neutrino interaction.

e/ measurement.• Neutrino cross-section

s.

Full volume scanning by SUTS Read out for Target 2.5kg, 4.8x1019POT at MINOS ND. exp~50 int

ニュートリノ反応点候補

10cm9cm

Plate 1 ～ 20

ニュートリノビーム

pl 57 pl 56 pl 55

30 plates

plate 間の繋ぎ

10cm 9cm

Vertex hunting

Counter independent vertex location

1ry VTX

Side view

e interaction candidate → NC interaction candidate

Proton candidate(dE/dX measurement)

2electron from 1ry vtx

neutrino

Beam view

e-shower

e-shower

e-pa

ir

sho

wer

e-pa

ir

sho

wer

1mm 1mm

PEANUT preliminary

3X0

B = 1.057[T]

Compact spectrometer (30mm) for M-ECCBeam test for 0.5GeV~2GeV pion with B=1.057T

Emul

sion

laye

rA

ir ga

p15m

mEm

ulsi

on la

yer

Air

gap1

5mm

Emul

sion

laye

rC.Fukushima, H.Shibutya, Toho university.

P(GeV/c) S(m)

0.5 79.6

1.0 39.8

2.0 19.89

B

ECC spectrometer

・

e+

30mm

Test exposure at KEK T1 beam line.

+ 0

.5G

eV

+ 1

.0

+ 2

.0R

efer

ence

(B=

0)

- 2

.0

- 1

.0

- 0

.5

The distribution of S (mean, width) is quite consistent with the bending and scattering.

s

em* air em air em 30mm

*em consist of OPERA emulsion with 200micron TAC supporter on both side.

* Proton contamination were rejected by dE/dx measurement

Test module inside

1T compact-permanent magnet

pions

P r

eso

lutio

n1

5.6

%1

5.1

%1

5.3

%

13.

9%

13.

1%

14.

5%

DATA

Momentum resolution with current setup.

p/p ~0.14 + 0.030 x p [GeV/c]

(p/p)MS

(p/p)Pos.Res.total error

p[GeV/c]    charge-misID2.0           0.00%5.0           0.00%10.0         0.02%15.0         0.62%20.0         2.72%

Farther improvement can be done by reducing materials (emulsion layer, TAC support) or change length.Technical paper will appear soon. C.Fukushima et.al.

Charge mis-identification probability for Pion.

Calculation assuming position resolution = 1 micron

Summary

• The scanning power and emulsion techniques are in progress.– Large area scanning.– Vertex location system.

• We are ready for CNGS running.

• Wide application of Emulsion detector. e/ ratio, cross-sections measurement.– Emulsion spectrometer.

Mass produced Emulsion FilmProduced by the production line of the photographic color film

Plastic base (200 m)

Surface protection layer

Nuclear Emulsion

(50m)

Nuclear Emulsion

Enables to make direct contact with Lead plate

Cross section

Nuclear Emulsion

(50m)

(1m)

Real-time Image Filtering and Packing ProcessorArrange readout segments

to lines

FIR filtersRing frame buffers

Spatial filter and Pixel Packing

LVDS Camera Interface

LVDS Output Interface

Camera In

スキャン負荷Area to be scanned

Events

/day

Scanning area

cm2/day

CHORUS 1mmx1mm 1000 10

OPERA 1μ 5cmx5cmx4surf 23 2300 total 5100

=250cm2/hOPERA 0μ 10cmx10cmx4surf 7 2800

50mm1mm 100mm

1μevent

0μevent

Required Scanning Power for CS

CHORUS

0.003

0.003

0.1

0.11.2

7.0

4060

200

1000

0.001

0.01

0.1

1

10

100

1000

cm2 /

h

TS(1994) NTS(1996) UTS(1998) SUTS(2006) SUTS(2007- )

Scanning Power Roadmap

1stagefacility

Scanning Power Roadmap

1.5m2/day = 1000cm2/h x 15h

0.000008

0.000048

0.00025

0.00150.003

0.018

0.71.4 2.8

14

0.000001

0.00001

0.0001

0.001

0.01

0.1

1

10

100

MB

yte /

sec

TS(1994) NTS(1996) UTS(1998) SUTS(2006) SUTS(2007- )

1stagefacility

BELLE10MByte/s

LHC 100MByte/s

S-UTS Output Data Speed