First Experiments with The SpRIT-TPC at SAMURAI in RIKEN-RIBF - - PowerPoint PPT Presentation

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First Experiments with The SpRIT-TPC at SAMURAI in RIKEN-RIBF - - PowerPoint PPT Presentation

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First Experiments with The SpRIT-TPC at SAMURAI in RIKEN-RIBF : EOS(symmetry energy Mizuki Kurata-Nishimura For S RIT-TPC collaboration

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SLIDE 1

First Experiments with The SpRIT-TPC at SAMURAI in RIKEN-RIBF

Mizuki Kurata-Nishimura

For SπRIT-TPC collaboration

  • :EOS(symmetry energy
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SLIDE 2

Contents

v 2016RIKEN-RIBF-SAMURAI

132Sn + 124Sn108Sn + 112Sn124Sn + 112Sn112Sn + 124Sn300MeV/u

v v SπRIT-TPC v v Photogrammetry measurement v v TPCTracking v v TPC-PID v Summary & Perspectives

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SLIDE 3

l 荷電粒子が通る l ガスがイオン化され電子が飛跡に沿って弾き飛ばされる。 l 電子を電場によってドリフトさせる。 l ドリフトしてきた電子を強い電場で増幅する。 l 検出した電荷をパッドの位置から２次元分布に変換。 l 到達した時間から３次元情報を算出

E field 135V/cm B field 0.5T Beam: 132Sn, 108Sn, 124Sn, 112Sn Target:112Sn, 124Sn Position in vertical drift direction from time

TPCTime Projection Chamber ””

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SLIDE 4

SπRIT-TPC

AsAd Boards 2D-motion target system

  • SπRIT-TPC is designed and

constructed at NSCL/MSU to be used in SAMURAI magnet chamber.

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SLIDE 5

Experimental Setup at SAMURAI in RIBF-RIKEN

n π+, p, d, t…..

NeuLAND

2m

Sn ~300MeV/u SAMURAI dipole magnet

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SLIDE 6

SπRIT-TPC Read-out Electronics

Beam 10Gb network CoBo CoBo CoBo CoBo

  • RIKEN HPC

SpiRITROOT analysis Semi-online Analysis xrootd Disk DAQ Disk DAQ

48 AsAds in total 4 AsAds into

  • ne Cobo

12 Cobos

AsAd <= 4 AGET (63 pads)

  • G. Jhang et al., J. Kor. Phys.Soci. 9

Issue 2, pp 144–151(2016)

AsAd

AGET AGET AGET AGET

AsAd

AGET AGET AGET AGET

AsAd

AGET AGET AGET AGET

AsAd

AGET AGET AGET AGET

Air cooling Assembling AsAds

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SLIDE 7

Performance of Gating Grid

  • Gating grid wires

–

  • GGCloseOpen
  • Garfield

– NIM paper is accepted

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SLIDE 8

Trigger detectors

Detector Location In trigger Purpose SBT: Start Counters After STQ mag. Hitting Count number of beam and determine start timing Active Collimator In front

  • f the

target No hit Reject beam passing through

  • utside of the

target. KATANA- Veto After the exit window Pulse Height <=

  • 30mV

eject beam-like residues with Z greater than 20 passing through the TPC Kyoto Array Left and Right side Multiplic ity >= 4 Trigger central collision events BDC: Beam Drift Chamber In beam line after S.C. not included Reconstruct a beam track NeuLAND 8.5m, 30deg not included Detect neutron and charged light particles

Active Collimator (no hit)

Beam

NeuLAND : Neutron detection SBT:Start Counter (hitting) Beam Drift Chamber(BDC)

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SLIDE 9

Photogrammetry Measurement

(Geodetic Systems, inc (GSI) http://www.geodetic.com

1. Put reflecting point stickers on the measuring surface 2. Take pictures from several angles. 3. Analyze picture data. 4. The absolute position of point is reconstructed. 5. Absolute position determined with ~0.2mm. 6. This results will be submitted soon!

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SLIDE 10

Beam & Target configurations

132Sn (49%) 108Sn (56%) 134Sb (10%) 110Sb (1.5%)

Beam Purity Energy [MeV/u] Target Purposeδ=(N-Z)/A Periods Time [h] Triggered Commissioning I

79Se

50% ~200 Al Full readout check

  • utside of the magnet
  • Oct. 22-23 & Oct.

29‘15 Commissioning II

132Sn

50% ~300

  • nat. Sn

Trigger system check inside the magnet

  • Apr. 6-10 ‘16

Xe

108Sn

49% 268.9

112Sn

neutron deficient δ = 0.09

  • Apr. 30 - May. 4 ‘16

64 10M Xe

112Sn

44% 270.2

124Sn

reference δ = 0.15

  • May. 4 - May. 6 ‘16

38 5.9M U

132Sn

57% 268.9

124Sn

neutron rich δ = 0.22

  • May. 25 – May. 29 ‘16

57 9.5M U

124Sn

10% 270.2

112Sn

reference δ = 0.15 May 30 – Jun. 1 ‘16 30 4.6M U (Z=1,2,3 A/Z=2) d, , 6Li ~300 Empty Gain Calibration

  • Jun. 1 ‘16

2.5 0.28M ~100 4.4 a

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SLIDE 11

2D & 3D Event Display

Top View

Side View

124Sn + 112Sn

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SLIDE 12

Track Reconstruction

1. Pulse Shape Analysis 2. Helix tracking: 3D momentum

1. Track separation 2. Riemann fit: 2D 3. Helix fit: 3D 4. Clustering 5. Initialize GENFIT parameters

3. GENFIT: precise fitting Parameterization, extrapolation) 4. RAVE(Reconstruction vertices)

t0: time at 5% of h

f: Fixed shape

Cosmic event

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SLIDE 13

Reaction at target

Active target Before target

Vertex Reconstruction

  • A. C.

Target Ladder Entrance window

Background can be eliminated

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SLIDE 14

Correlation between Extrapolated track from TPC and Beam at the target.

Nice correlation indicates the successful operation of DAQ synchronization and vertex reconstruction Intrinsic spatial resolution is estimated to be ~ 1mm.

X Y

Two drift chambers provide us beam position at the target Each track extrapolated onto the target

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SLIDE 15

Centrality Trigger by Multiplicity

URQMD+G4 132Sn(300MeV/u) + 124Sn

Impact Parameter [fm]

30 30 Central Peripheral Peripheral Central

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SLIDE 16

Tracking Efficiency by KATANA_M

  • TPCtrack

KATANA_M

  • Track%
  • KATANA_MTrack

10%.

  • Tracking algorism Simulation
  • /

~10% inefficiency

  • f tracking

1

>95% Efficiency

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SLIDE 17

PID by TPC

  • gain
  • ππ+
  • p, d, t, 3,4He

PID by TPC (132Sn + 124Sn @E/A=280MeV)

π- π+

  • p/Q
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SLIDE 18

Summary

  • SπRIT-TPC MSU
  • 132, 108, 124, 112Sn+124, 112Sn2016
  • δ(=(N-Z)/A)10M
  • π-π+pdtHePID
  • TPCTracking Reconstruction
  • Perspectives

– Technical papers – PhD

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SLIDE 19

Thank you for your attention