Fuminori Sakuma, RIKEN for the J-PARC E15 Collaboration

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Development of the Cylindrical Detector System for an experimental search for kaonic nuclei at J-PARC Fuminori Sakuma, RIKEN Fuminori Sakuma, RIKEN for the J-PARC E15 Collaboration for the J-PARC E15 Collaboration 1 J-PARC E15 Experiment Cylindrical Detector System Cylindrical Drift Chamber (CDC) Z-Vertex TPC Summary The Third Joint JPS/DNP Meeting (Hawaii 2009), Oct. 13-17, 2009

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Development of the Cylindrical Detector System for an experimental search for kaonic nuclei at J-PARC. Fuminori Sakuma, RIKEN for the J-PARC E15 Collaboration. J-PARC E15 Experiment Cylindrical Detector System Cylindrical Drift Chamber (CDC) Z-Vertex TPC Summary. - PowerPoint PPT Presentation

Transcript of Fuminori Sakuma, RIKEN for the J-PARC E15 Collaboration

Page 1: Fuminori Sakuma, RIKEN for the J-PARC E15 Collaboration

Development ofthe Cylindrical Detector System

for an experimental searchfor kaonic nuclei

at J-PARCFuminori Sakuma, RIKENFuminori Sakuma, RIKEN

for the J-PARC E15 Collaborationfor the J-PARC E15 Collaboration

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J-PARC E15 ExperimentCylindrical Detector System•Cylindrical Drift Chamber (CDC)•Z-Vertex TPC

SummaryThe Third Joint JPS/DNP Meeting (Hawaii 2009), Oct. 13-17, 2009

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J-PARC E15 Experimentsearch for K-pp bound state using 3He(K-,n) reaction

K-3He Formation

exclusive measurement byMissing mass spectroscopy

andInvariant mass reconstruction

Decay

K-ppcluster

neutron

p

p

-

Mode to decay charged particles

Missing

mass

Spectroscop

y

via neutron

Invariant

mass

reconstructio

n at J-PARCat J-PARC

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J-PARC E15 Setup

1GeV/cK- beam

p

p

n

mass resolution for K-ppinvariant mass= 19MeV/c2 (CDC = 250m)missing mass (for 1.3GeV/c neutron)= 9.2MeV/c2 (ToF = 150ps)

NeutronToF Wall

CylindricalDetectorSystem

Beam SweepingMagnet

K1.8BR Beam Line

flight length = 15m

neutron

Beam trajectory

CDS &target

SweepingMagnet

NeutronCounter

Beam LineSpectrometer

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Cylindrical Detector System (CDS)Solenoid Magnet

Cylindrical Drift Chamber

L3He Target System

Z-Vertex TPC

B

Hodoscope Counter

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Cylindrical Drift Chamber (CDC)

hexagonal cell (drift length 9mm)15 layers (r = 19.0548.45cm)7 super layers (AUVAUVA)

made of Aluminum and CFRP# of wires : 8136 (read-out : 1816ch)solid angle = 2.6Ar:C2H6=50:50

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CDC (Cont’d)preamp cards and cables are attached

TDC’s in the counting room LVDSECL converters at the exp. hall

•Chip : CXA3183Q (SONY, low noize ASD IC, =16nsec)•Output : LVDS differential•Gain : 0.8V/pC at preamp8m

cables60m

cables

LVDSECL

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CDC Study with Cosmic-Ray

Intrinsic spatial resolution ~200Intrinsic spatial resolution ~200mm

CDC works good with expected performances

efficiency

x-t correlation

residual

resolution=206m

--- cosmic-ray run

stereo stereo

(using 90Sr)

T.Hiraiwa (Kyoto-u)K.Tsukada (RIKEN)

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Z-Vetex TPC (Z-TPC)

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

0 5 10 15 20 25 30 35

reso

luti

on(m

m)

z(cm)

longitudinal

transverse

gas:P10 (150V/cm)

expected resolution (w/o B-field)

however, r-resolution is limited by pad size, e.g., 20.0/sqrt(12) = 5.8mm

To improve z-resolution,Z-TPC is newly constructing

z(p-): 7mm 2mmw/o

Z-TPCw/

Z-TPC

~500mm

~300mm

280

mm

170

mm

readout-pad•pad size:20x4mm•# of pad:4x4x9=144

field strip•double sided flexible print circuit board•8mm strip•10mm pitch

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Z-TPC (Cont’d)a double TGEM structure is used for amplificationSony ASD chips are used for our preamp at first (No dE/dx)in the future, fast FADC or ASDQ chips will be used to measure dE/dx

TGEM for Z-TPC

readout part

preamps

frame

field cage

Z-TPC will be ready in this yearZ-TPC will be ready in this year

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10cm10cm

HV

Thick-GEMa robust, simple to manufacture, high-gain gaseous electron multipliercost-effectively fabricated from double-clad G10 plates, using standard printed circuit board (PCB) techniquesholes are mechanically drilled (and the hole’s rim is chemically etched to prevent discharges)easy to operate and feasible to cover large areas, compared to the standard foil GEM

Thick-GEM @ RIKEN

11mm

2mm

2mm

drift mesh

TGEM #1

TGEM #2

R/O pad ASD

Edrift

Etrans

Etrans

55Fesetup

=150V/cm

=2.5*VGEM V/cm

=5*VGEM V/cm

w/ Rims

w/o Rims

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Thick-GEM StudyType Comment hole drim pitch thick size

TGEM1 w/ rim

0.3mm

0.05mm

0.6mm 0.4mm

100mmX

100mmTGEM2 w/o rim X

RETGEM Carbon X

H-RETGEM C+Cu hybrid XRETGEM: carbon electrodesH-RETGEM: carbon and copper electrodes on each side

The TGEMs reach effective gain of ~104, that is of practical use

It seems that the RETGEMs and hybrid RETGEMs work good

goalgoal ~10~1044

M.Tokuda (Tokyo-TECH)

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Thick-GEM StudyType Comment hole drim pitch thick size

TGEM1 w/ rim

0.3mm

0.05mm

0.6mm 0.4mm

100mmX

100mmTGEM2 w/o rim X

RETGEM Carbon X

H-RETGEM C+Cu hybrid X

start gain ~ 2x104

start gain ~ 4x103

RETGEM RETGEM relative gain

energy resolution

TGEM1TGEM1relative gain

energy resolution

start gain ~ 2x104

start gain ~ 4x103

TGEM2TGEM2relative gain

energy resolution

start gain ~ 2x104

start gain ~ 4x103

start gain ~ 2x104

start gain ~ 4x103

H-RETGEM H-RETGEM relative gain

energy resolution

RETGEM: carbon electrodesH-RETGEM: carbon and copper electrodes on each side

all TGEMs keep almost constant gain after initial gain dropall TGEMs keep almost constant gain after initial gain drop

instableinstablestable, but, there are no reproductive stable, but, there are no reproductive

repeatability of the repeatability of the RETGEMsRETGEMs

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Thick-GEM StudyType Comment hole drim pitch thick size

TGEM1 w/ rim

0.3mm

0.05mm

0.6mm 0.4mm

100mmX

100mmTGEM2 w/o rim X

RETGEM Carbon X

H-RETGEM C+Cu hybrid X

instability in the TGEM with rims is caused by charge up of the insulator?

lack of productive repeatability of RETGEM is caused by drilling process?

We have to study TGEM/REGEM in more detail

problems to be solved!problems to be solved!

RETGEM: carbon electrodesH-RETGEM: carbon and copper electrodes on each side

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Summary

J-PARC E15 experiment– Search for the simplest deeply-bound kaonic nuclear state,

K-pp, by in-flight 3He(K-,n) reaction

Detector construction is in progress– Solenoid Magnet, CDC, Z-TPC, CDH, 3He Target, and other

detectors– CDC works good with expected performances– Z-TPC will be completed in this year– TGEM study is ongoing…

Instability of TGEM with rims Lack of productive repeatability of RETGEM

The goal is to develop the “stable” TGEM/RETGEM.The goal is to develop the “stable” TGEM/RETGEM.

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J-PARC E15 Collaboration

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Page 17: Fuminori Sakuma, RIKEN for the J-PARC E15 Collaboration

Physics Motivation

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QGP neutronstar

SPS, RHIC, LHC

KEK-PS

W.Weise NPA553, 59 (1993).

E549@KEK-PS FINUDA@DANE

DISTO@SATUREN

OBELIX@CERN-LEAR

T.Yamazaki, A.Dote, Y.Akiaishi PLB587,167(2004).

We need conclusive evidence!

deeply-bound kaonic nuclear states exist?

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vtxK-pp vtx

p

p-

n~1300MeV/c

~400MeV/c~150MeV/c

~500MeV/c

Expected Kinematics for K-pp Decay

p

p -

binding energy = 100MeV/c2

Isotropic decay of K-pp with forward neutron

Calculated using Geant4

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Hodoscope Counter (CDH)expected pID using ToF measurements

CDH system has been mounted inside the Solenoid Magnet

CDH is used for the charged trigger and particle identification.

Plastic Scintillator : 99x30x700 mm3 ( W X T XL ) Configuration : 36 modulesPMT: Hamamatsu H8409 (fine mesh) x 72int = 76psec

Feb. 2009

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Kaon Decay Veto Counterreduce fake triggers caused by decay of K- beamrequirements for the detector

•inside CDC & magnetic field•small and compact

plastic scintillators embedded with wavelength shifting (WLS) fibers are in progress

Feb. 5-8, 2008test experiment atLNS, Tohoku Univ., Japan

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layernumber

wiredirection

super-layer number ofcells

radius [cm] cell width[degree]

drift length[cm]

offset angle[degree]

tilt angle[degree]

1 X 19.05 0.83 02 X’ 20.4 0.89 03 X 21.75 0.95 04 U 24.85 0.87 3.725 U’ 26.2 0.91 3.926 V 29.3 0.92 3.957 V’ 30.65 0.96 4.128 X 33.75 0.88 09 X’ 35.1 0.92 0

10 U 38.2 0.80 3.4311 U’ 39.55 0.83 3.5512 V 42.65 0.84 3.5913 V’ 44 0.86 3.7114 X 47.1 0.82 015 X’ 48.45 0.85 0

A3 180 2 0

U2 150 2.4 7.2

V2 160 2.25 6.75

V1 100 3.6 10.8

A2 120 3 0

A1 72 5 0

U1 90 4 12

Detailed Cell Configuration

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Calculated using Geant4generated at the center of CDS0<p<1 GeV/c, flat distribution60<<120 degree, flat distributionaccepted = track with a CDH-hit

decay

proton>250MeV/c, kaon>150MeV/c, pion>50MeV/cenergy loss

magnetic field = 0.5T

Geometrical Acceptance

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mass resolution K-ppp p

w/o chamber-resolution

5.8 MeV/c2 1.6MeV/c2

w/ chamber-resolution 18.7MeV/c2 2.5MeV/c2

invariant mass resolution for K-pp and

momentum resolution for , K, pCalculated using Geant4

Expected Spectrometer Performance

Invariant mass of p (MeV)

0 channel channel

K-pp= 60 MeV

we can distinguish the two non-mesonic decay modes for K-pp

– K-pp p p-p

– K-pp 0p p p-p