Particle ID by range-scattering method T. Toshito(Nagoya univ.) Inspired by Takahashi’s yesterday...

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Particle ID by range- scattering method T. Toshito(Nagoya univ.) red by Takahashi’s yesterday presentation of fragme
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Transcript of Particle ID by range-scattering method T. Toshito(Nagoya univ.) Inspired by Takahashi’s yesterday...

Page 1: Particle ID by range-scattering method T. Toshito(Nagoya univ.) Inspired by Takahashi’s yesterday presentation of fragments.

Particle ID by range-scattering method

T. Toshito(Nagoya univ.)

Inspired by Takahashi’s yesterday presentation of fragments

Page 2: Particle ID by range-scattering method T. Toshito(Nagoya univ.) Inspired by Takahashi’s yesterday presentation of fragments.

Particle ID by range-scattering method

0/6.13 Xxp

zMeV

Scattering:

Range:

)(2

fz

MR

Range as number of 1mm iron plates

Numerical calculation

proton

αscat

teri

ng b

y a

1mm

iron

pla

te

55MeV

220MeV

Page 3: Particle ID by range-scattering method T. Toshito(Nagoya univ.) Inspired by Takahashi’s yesterday presentation of fragments.

High precision data of nuclear fragmentation is required to improve heavy ion therapy.Data base constructionGeant4 tuning

target(for example H2O)beam

Projectile fragmentsalmost same velocity as beam

R&D of emulsion technology

NIRS HIMAC P152to study fragmentation by emulsion

Multi particle detection

Page 4: Particle ID by range-scattering method T. Toshito(Nagoya univ.) Inspired by Takahashi’s yesterday presentation of fragments.

400MeV/u 12C

lucite (1mm)

H2O(2mm)

OPERA-film×4+lucite(1mm)

Lead ECCOPERA-film(29)+Pb(1mm)+OPERA-film(28)+Pb(1mm)+ …+Pb(1mm)+OPERA-film(1)

29cm 4.4cm

Multi(65) layer water target chamber Dec.2004

Vertex detector Analyzer

Page 5: Particle ID by range-scattering method T. Toshito(Nagoya univ.) Inspired by Takahashi’s yesterday presentation of fragments.

400MeV/u 12C

lucite (1mm)

H2O(2mm)

OPERA-film×4+lucite(1mm)

Lead ECCOPERA-film(29)+Pb(1mm)+OPERA-film(28)+Pb(1mm)+ …+Pb(1mm)+OPERA-film(1)

29cm 4.4cm

Multi layer water target chamber

Vertex detector Analyzer

Page 6: Particle ID by range-scattering method T. Toshito(Nagoya univ.) Inspired by Takahashi’s yesterday presentation of fragments.

400MeV/u 12C

lucite (1mm)

H2O(2mm)

OPERA-film×4+lucite(1mm)

Lead ECCOPERA-film(29)+Pb(1mm)+OPERA-film(28)+Pb(1mm)+ …+Pb(1mm)+OPERA-film(1)

29cm 4.4cm

Multi layer water target chamber

Vertex detector Analyzer

Page 7: Particle ID by range-scattering method T. Toshito(Nagoya univ.) Inspired by Takahashi’s yesterday presentation of fragments.

430MeV/u 12C~4000events~12000tracks

2cm22cm

Ekine=430 ~ 200MeV/u

Page 8: Particle ID by range-scattering method T. Toshito(Nagoya univ.) Inspired by Takahashi’s yesterday presentation of fragments.

400MeV/u 12C

lucite (1mm)

H2O(2mm)

OPERA-film×4+lucite(1mm)

Lead ECCOPERA-film(29)+Pb(1mm)+OPERA-film(28)+Pb(1mm)+ …+Pb(1mm)+OPERA-film(1)

29cm 4.4cm

Multi layer water target chamber

Vertex detector Analyzer

Page 9: Particle ID by range-scattering method T. Toshito(Nagoya univ.) Inspired by Takahashi’s yesterday presentation of fragments.

400MeV/u 12C

lucite (1mm)

H2O(2mm)

OPERA-film×4+lucite(1mm)

Lead ECCOPERA-film(29)+Pb(1mm)+OPERA-film(28)+Pb(1mm)+ …+Pb(1mm)+OPERA-film(1)

29cm 4.4cm

Multi(65) layer water target chamber

Vertex detector Analyzer

Page 10: Particle ID by range-scattering method T. Toshito(Nagoya univ.) Inspired by Takahashi’s yesterday presentation of fragments.

Analyzer (Lead ECC)

All fragments with Z 4≧such as 10B,9Be are stopped.

Low energy fragments with Z 3≦such as 7Li,6Li,α,p,d,t are stopped.

(majority of Z 3 fragments pass through)≦

Precise measurement of scattering is possible.

Page 11: Particle ID by range-scattering method T. Toshito(Nagoya univ.) Inspired by Takahashi’s yesterday presentation of fragments.

Analyzer

Test data taking by UTS will be done soon.

Considered as appropriate bench to study particle IDfor nuclei of Z 6 using ≦ range-scattering method.

Applicable to DONUT analysis

Page 12: Particle ID by range-scattering method T. Toshito(Nagoya univ.) Inspired by Takahashi’s yesterday presentation of fragments.
Page 13: Particle ID by range-scattering method T. Toshito(Nagoya univ.) Inspired by Takahashi’s yesterday presentation of fragments.

水槽

エマルションフィルム12.5cm10

cm

OPERA 実験用に大量生産中

87 層

40cm 21cm

厚さ293μm

Page 14: Particle ID by range-scattering method T. Toshito(Nagoya univ.) Inspired by Takahashi’s yesterday presentation of fragments.

炭素 - 水反応収集用  水ターゲットチェ

ンバー人体の主要構成物質

2004 年 1 月マシンタイム

430MeV/u β=0.72 12C ビーム12000 本 /2cm×2cm

87 層

遮光防水フィルム厚さ ~128μm

3mm

30cm

エマルションフィルム44μm 両面塗り 205μmTAC ベース

87 層水中飛程 ~30cm

ビームが静止するまでのエネルギー領域をカバー

Page 15: Particle ID by range-scattering method T. Toshito(Nagoya univ.) Inspired by Takahashi’s yesterday presentation of fragments.

Energy Scaling• 始点:加速器によるビームエネルギー (430MeV/u)• 終点:反応を起こさないビームが到達する深さを

3mm 間隔のサンプリングで測定• 途中: GEANT4 によるモンテカルロ計算で内挿

反応点の深さ⇔炭素ビームのエネルギーエネルギー絶対値の誤差< 2%

深さ

12C ビーム430MeV/u

終点:測定点

物質量の補正

エネ

ルギ

Page 16: Particle ID by range-scattering method T. Toshito(Nagoya univ.) Inspired by Takahashi’s yesterday presentation of fragments.

パルスハイトによる電荷の分離

・・・・・・

Z=1 Z=2

Z=62 次粒子 入射粒子

16 層

ピクセル0.3μm× 0.3μm

Ekine=430~100MeV/u

44μm

検出された飛跡

パルスハイト

パルスハイト:フィルム 1 枚あたりの平均ピクセル数Z=1 の粒子に対しては∝ dE/dx(β)

Z 3≧

Page 17: Particle ID by range-scattering method T. Toshito(Nagoya univ.) Inspired by Takahashi’s yesterday presentation of fragments.

2004 年 12 月 1 日マシンタイム

水 (H2O) とアクリル (C5H8O2) の複合ターゲット 低感度エマルションの導入 ( リフレッシュ )⇒ 電荷の区別可能

検出器のアップグレード

Normal エマルション

低感度 :~1/538℃ リフレッシュ

水 水 水

2mm 低感度 :~1/740℃ リフレッシュ

アクリル ( 厚さ 1mm)

400MeV/u

12C

65 層

Page 18: Particle ID by range-scattering method T. Toshito(Nagoya univ.) Inspired by Takahashi’s yesterday presentation of fragments.

1 層目 24 層目多重度 2 以上の反応の 2 次粒子

40℃

リフ

レッ

シュ

38℃ リフレッシュ

BC

Be

Li

He10.7cm パルスハイト

Z=6 まで電荷を識別

65 層のうち上流側 24 層分