The dirc projects of the panda experiment at fair
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The DIRC projects of the PANDA experiment at FAIR. Klaus F öhl on behalf of the. Work supported by EU FP6 grant contract number 515837 DIRACsecondary-Beams. RICH2007 Trieste, Italy October 2007. Cherenkov Group.

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The DIRC projects of the PANDA experiment at FAIR

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The dirc projects of the panda experiment at fair

The DIRC projects of thePANDA experiment at FAIR

Klaus Föhl on behalf of the

Work supported

by EU FP6 grant

contract number 515837

DIRACsecondary-Beams

RICH2007

Trieste, Italy

October 2007

Cherenkov Group

Darmstadt Dubna Edinburgh Erlangen Ferrara Giessen Glasgow Krakow Wien


The dirc projects of the panda experiment at fair

Hadron spectroscopy

- Charmonium spectroscopy

- Gluonic excitations (hybrids, glueballs)

Charmed hadrons in nuclear matter

Double -Hypernuclei

HESR

Nuclei Far From Stability

Compressed Nuclear Matter

High Energy Density in Bulk

Antiprotons


A view of panda

p

A View of PANDA

AntiProton ANnihilations at DArmstadt

Forward

Spectrometer

Target

Spectrometer


A view of panda1

A View of PANDA

AntiProton ANnihilations at DArmstadt

  • High Rates

    • 2 107 interaction/s

  • Vertexing

    • KS0, Y, D, …

  • Charged particle ID

    • e±, μ±, π±, K, p,…

  • Magnetic tracking

  • EM. Calorimetry

    • γ,π0,η

  • Forward capabilities

    • leading particles

  • Sophisticated Triggers


Particle id kinematics

Particle ID & Kinematics

-

+

+

K  

 

K K 

  K even

or K    

-

+

+

-

pp  KK T=5,10,15 GeV/c

pp  DD D  Kpp

T=6.6 GeV/c

+

+

-

+

+

-

-

+

+

+

pp i.e. open charm production

+

D

distinguish  and K (K and p) ...


Panda target spectrometer

PANDA Target Spectrometer

Acceptance for

pp  h  @ 15 GeV

End- cap

Barrel

Endcap

Barrel

PANDA: 4 detector desire to keep EMC small  hence we suggest DIRCs

FS

Target Spectrometer

two areas – two detector geometries


The dirc projects of the panda experiment at fair

...shipping coal to Newcastle...

...talking about DIRC at RICH...


Dirc principles

n

DIRC Principles

Detector of

Internally

Reflected

Cherenkov light

lower p threshold

p

K

solid DIRC

n=1.47

<1

=1

p

K

15 deg

<1

Time-of-Propagation for C

fused silica

10mm 0.4eV

=1


Barrel dirc

Barrel DIRC

Barrel-DIRC

BaBar-like

2D + t or (2+1)D design

2-dimensional

imaging type

Poster  Carsten Schwarz: The Barrel DIRC of the PANDA experiment


The dirc projects of the panda experiment at fair

PANDA barrel DIRC

scaled BaBar version suits PANDA

“only” 7000 PMT

(BaBar 11000 PMT)

Simulations

pp →J/ψ Φ √s = 4.4 GeV/c2

kaon efficiency 98%

π misidentification

as kaon 1-2%


The dirc projects of the panda experiment at fair

R&D towards smaller photon detector

needs optical elements instead of pinhole focus

mirrors

lenses

PANDA barrel DIRC

focal plane

detector

two lenses for flat focal plane

Oil

H2O

air

SiO2

quartz bar

air

mirrors


The dirc projects of the panda experiment at fair

Y

PANDA barrel DIRC

y

close to threshold:

small variations in n(λ)

cause large δΘ

fused silica

β=0.69

cos(Θ)=1 / βn(λ)

β=0.72

Time of Propagation (TOP) measurement better 0.5ns

allows to correct dispersion

for high and low momenta→x,y,t→3D-DIRC

x


Panda target spectrometer1

PANDA Target Spectrometer

Two different readout designs:

Time-of-Propagation

Focussing Lightguide

(1+1)D design

2D + t design

Endcap Disc DIRC

1-dimensional

imaging type

Poster  Peter Schönmeier: The Endcap DIRC of the PANDA experiment


Dispersion corrections

Dispersion Corrections

different directions

for different colours

for a given time t different horizontal

distances for different photon colours

ToP

ToP – Solution:

Focussing – Solution:

relevant

for ToP

narrow bands

in wavelength

dispersive prism

component


Time of propagation design

Time-of-Propagation design

colour filters

dichroic mirrors as colour filters

allows two wavelength bands

higher photon statistics

small wavelength bands

minimise dispersion effect

+optimised photocathodes

mirrors

mirrors give different path lengths

 self timing design

  • reflect

  • some

  • photons

  • several

    different

    path lengths

mirrors allow longer path lengths

 better relative time resolution

20mm fused silica

radiator disc

single photon resolution t~30-50ps required


Time of propagation design1

Time-of-Propagation design

larger text

0 reflections

1 reflection

2 reflections

3 reflections

50 events

time-of-propagation [ns]

 [deg]


Time of propagation

Time-of-Propagation

particle angle 15 deg

t=50ps

E x QE=(0.18+0.2)eV

disc with black hole


Focussing lightguide

Focussing Lightguide

radiator

edge

*

LiF

*

SiO2

photo

sensor

strips

fused silica (SiO2)

radiator 10-15mm

  • * discrete lightguide no.

  • * angle in (r-z) plane

  • LiF for dispersion correction

  • photon extraction into lightguide

  • lifts up-down direction ambiguity

  • focussing inside lightguide

*

*

lightguides


The dirc projects of the panda experiment at fair

Focussing & Chromatic Correction

no mirror coating

1-dim aspheric surface

total internal reflection

angle independent of 

not-perfect

focussing as

curvature is

compromise

(but good enough)

light is only

going upwards

two boundary surfaces make

chromatic dispersion correction

angle-independent in first order

light never leaves

dense optical medium

 good for phase space

Focal Plane

(dispersive direction)

1-dimensional readout


Focussing lightguide1

Focussing Lightguide

target

vertex

0  [deg] 360

simulation example with 2 fit analysis

disc 10mm thick, 0.4eV

short lightguide 125mm, focal plane 48mm


Research development

Thursday  Albert Lehmann: Performance Studies of Microchannel Plate PMTs in High Magnetic Fields

Research & Development

  • Polishing Effectiveness

  • Radiator Tests

  • Radiation Hardness

  • Photon Detectors

30m x 30 m

AFM

5.46 nm

full vertical scale

Friday  Matthias Hoek: Radiation Hardness Study on Fused Silica

magnetic field (up to B=2T), photon rate (MHz/pixel),

light cumulative dose, radiation dose


Summary

Summary

  • High antiproton rates require novel detectors for PID

  • We propose DIRCs for the PANDA Target Spectrometer

FS

TS

  • Several designs with innovative solutions

    • Barrel DIRC with optical elements

    • Endcap DIRC – Time-of-Propagation

    • Endcap DIRC – Focussing Lightguide

  • R&D in progress


Panda participating institutes

Panda Participating Institutes

more than 300 physicists (48 institutes) from 15 countries

U & INFN Genova

U Glasgow

U Gießen

KVI Groningen

U Helsinki

IKP Jülich I + II

U Katowice

IMP Lanzhou

U Mainz

U & Politecnico & INFN Milano

U Minsk

TU München

U Münster

BINP Novosibirsk

LAL Orsay

U Pavia

IHEP Protvino

PNPI Gatchina

U of Silesia

U Stockholm

KTH Stockholm

U & INFN Torino

Politechnico di Torino

U Oriente, Torino

U & INFN Trieste

U Tübingen

U & TSL Uppsala

U Valencia

IMEP Vienna

SINS Warsaw

U Warsaw

U Basel

IHEP Beijing

U Bochum

U Bonn

U & INFN Brescia

U & INFN Catania

U Cracow

GSI Darmstadt

TU Dresden

JINR Dubna(LIT,LPP,VBLHE)

U Edinburgh

U Erlangen

NWU Evanston

U & INFN Ferrara

U Frankfurt

LNF-INFN Frascati


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