2007/Oct/18~19 KPS@JEJU 1

Liquid Scintillator R&D for RENO

Lee, Jaison

For RENO Collaboration

2007/Oct/18~19 KPS@JEJU 2

Contents

Introduction

RENO Detector

Liquid Scintillator Formulation

Gd Loaded LS

Long Term Stability

Radiopurity

LS Purification and Handling System

Summary

2007/Oct/18~19 KPS@JEJU 3

Aromatic Oil Fluor WLS Gd-compound

PC(Pseudocumene)PXELAB

Mineral oilDodecane

TetradecaneLAB

PPOBPO

Bis-MSBPOPOP

0.1% Gd compounds with CBX or BDK

Introduction

General Compositions of Liquid Scintillator (LS)

Other Experiments KamLAND : PC(20%)+Dodecane(80%)+PPO Chooz : Palo Verde : PC(40%)+M.O.(60%)+PPO+bis-MSB+Gd

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Anti-neutrino Target (Gd loaded) - Light Yield ↑ : Good Scintillating Material - Attenuation Length ↑ : Transparency ↑ - Stability ↑ : Compatible with Acryl Vessel - # of free Proton ↑ : H/C ↑ - Systematic error ↓ : Well understanding mono-molecule , Radiopurities ↓ Gamma Catcher - Light Yield ↑ : Good Scintillating Material - Attenuation Length ↑ : Transparency↑ - Stability ↑ : Compatible Acryl Vessel - Systematic error ↓ : Radiopurities ↓

Introduction

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Liquid Scintillator R&D 에서 수행하는 사항들 :

- 구성물질의 조합과 배합 비율 결정

- 빛 방출량 측정

- 투광도 및 흡광도 측정

- purification system

- 주기적 측정에 의한 장기적 안정성 검사

- 변색 여부 검사

- 아크릴의 거부 반응 여부

INR/IPCE 러시아 그룹 (Gd powder 생산 ) 과 공동연구 : 2 회 방문연구 수행

Introduction

2007/Oct/18~19 KPS@JEJU 6

-catcherbuffer

PMT surface

1.4m 1.6m0.6m

veto

0.7m1m

0.177m

Target

RENO Detector

• Target : LS + Gd (0.1%)• Gamma Catcher : LS• Buffer : M.O.• Veto : Water

Inner Diame

ter(cm)

Inner Height(cm)

Thickness

(mm)

Filled with

Volume

(m3)

Mass(tons

)

Target vessel

280 320 12Gd(0.1%

) +LS19.7 15.4

Gamma

catcher

400 440 8 LS 35.2 27.5

Buffer tank

540 580 4Mineral

oil76.9 59.2

Veto tank

740 780 15 water 201.8 201.8

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  화학식 H:C

M.W.(g/

mol)

Density(g/ml)

Boiling 

Point

Flash Point

Viscosity

@20 도기타

decane C10H22   142.29 0.73 174 46 0.92cps국내생산 (이수화학 )

장점

dodecane C12H262.17

170.34 0.7493 216.2 71    

tetradecane C14H30  198.392

20.767 253 99    

PC C9H121.33

120.20.89(0.87

6)169 48  

인체 , 환경유해성 최고 . 낮은 FP 문제

LABC6H5

(CnH2n+1)

  233-237 0.86 275-307 130 5-10cps나라 , 회사마다 quality uncertainty. R&D 결과

없음 . 무해성

PXE C16H181.12

210.3 0.988 295 145 5.2cSt@40 생산지문제 (일본생산 )

MOCnH2n+2, n=10-

44    ~0.8   ~110

10-80cSt@40

Np 개수 불확실성

PC20dod80   2   0.78        

PXE20dod80 

 1.96

  0.80   >80    

PC20MO80       0.857        

PC40MO60       0.866        

여 러 solvent 에 대 한 일 반 적 성질

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PC 와 Mineral oil/Dodecane 대용으로 사용할 수 있는 LAB(Linear Alkylbenzene) 의 분자 구조식

PC/PXE + Dodecane 의 대용으로 LAB 사용 가능성 연구

• High Light Yield : not likely Mineral oil(MO)• replace MO and even Pseudocume(PC) probably• Good transparency: better than PC• High Flash point : 147oC (PC : 48oC)• Environmentally friendly (PC : toxic)• Components well known, Mineral Oil : not well known• Domestically available: Isu Chemical Ltd.

Light yield measurement

PC100% LAB100% PC40% PC20% LAB100% PC20% N2 LAB60% LAB80% MO80%

CnH2n+1-C6H5 (n=10~14)

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LS Formulation

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PPO (g/ ㅣ ) LY (arb unit)±30

1 444.7

2 618.7

3 649.4

4 634.3

5 630.9

6 579.4

7 577.2

10 542.7

20 505.1

Purified LAB(100) + varying PPO PPO 3g/l 일 때 , LY saturation LAB100 + PPO3g/l PC 보다 PPO 가 잘 녹지는 않는다

RENO 측정 (LAB100)

1g PPO2g PPO3g PPO4g PPO5g PPO6g PPO7g PPO10g PPO20g PPO

PPO Concentration

2007/Oct/18~19 KPS@JEJU 11

Bis-MSB(mg/l)

PPO(1):bis-MSB ratio

LY(arb unit)±30

0 0 668.7

10 1/300 714.7

20 1/150 855.8

30 1/100 917.5

40 1/75 904.4

50 1/60

60 1/50 873.9

100 1/30

200 1/15 845.1

bis-MSB 양 증가에 따른 LY 최적값을 찾을 수 있다 LAB100+PPO3g/l+bis-MSB30mg/l 60mg 이 넘어가면 , solubility 가 나빠짐

Baseline: LAB100PPO3g/l + varying bis-MSB 0mg/l 10mg/l 20mg/l 30mg/l 40mg/l 50mg/l 60mg/l 100mgl 200mg/l

1/100

1/15

bis-MSB Concentration

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Gd Loaded LS

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Gd Loaded LS

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Long Term Stability of LS

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Radiopurity of LS

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Schematic Design for LS Purification and Handling System

N2

Detector

PLS

PGdLS

PMO

P pump

micro filterflow metermass flow meter

valve

200L

200L

200L

1~2 L/minW.E.

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Summary

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Back Up

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공대정

CnH2n+1-C6H5 (n=10~14)

n=10

n=11

n=12 n=13

LAB Component with GC-MS

n 성분비 (%)

10 7.17

11 27.63

12 34.97

13 30.23

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LAB has lower optical absorption, better attenuation length

100% LAB and PC have similar light outputs

We got similar results with BNL & Daya Bay experiment

100%82%96%

Absorption spectra Light output spectra

Performance of Gd in PC & LAB

w/o Gd