ALICE & heavy ion physics Michal Šumbera Nuclear Physics Institute AS CR, Řež.

ALICE & heavy ion physicsMichal Šumbera

Nuclear Physics Institute AS CR, Řež

7.4.200 Michal Šumbera RECFA- Prague 2000

PHASE DIAGRAM OF QCD MATTER PHASE DIAGRAM OF QCD MATTER


SPS lead beam experimentsSPS lead beam experiments

Study of strange and multi-strange baryon production in lead-lead collisions

High statistics study of photons, neutral hadrons and charged particles, and

their correlations in Pb-Pb collisions.

Study of electron-pair production at high energy heavy ion collisions.


WA97/NA57WA97/NA57

• Institute: * Institute of Physics, Prague

• People: P.Závada, P.Staroba, J.Weichert,

J.Böhm, K.Píška• Activities:

Maintenance and operation of the beam trigger counters

Event reconstruction using data from pixel telescope

HBT interferometry Phenomenological analysis of multi-strange

baryon production


WA97/NA57WA97/NA57



Enhanced production of multi-strange baryons:Signature of QGP

Enhanced production of multi-strange baryons:Signature of QGP


WA98WA98

• Institute:

* Nuclear Physics Institute, Řež

• People: M.Šumbera, S.Eliseev,V. Petráček,

I. Hřivnáčová, A. Kugler, M. Pachr,J. Rak

• Activities: Maintenance and operation Silicon Drift

Detector Data analysis Search for Disorientd Chiral Condensates Study of multiparticle correlations



M.M. Aggarwal et al.

Phys. Rev. Lett. 83(1999)926

M.M. Aggarwal et al.

Phys. Rev. Lett. 83(1999)926


Direct photon resultDirect photon result

Preliminary

Preliminary


CERES/NA45CERES/NA45

• Institute:

* Nuclear Physics Institute, Řež (since 1997)

• People: M.Šumbera, V.Kouchpil,V. Petráček, J.Rak, D.Adamová, V.Hanzal,

I.Hřivnáčová

• Activities: Maintenance and operation of doublet of

Silicon Drift Detectors Data analysis Search for open charm production High pT particle production




WA98 & NA45/CERES: Radial Silicon Drift Detectors

WA98 & NA45/CERES: Radial Silicon Drift Detectors




Enhanced production of low pT e+e- pairs:Signatureof chiral symmetry restoration

Enhanced production of low pT e+e- pairs:Signatureof chiral symmetry restoration

Michal Šumbera RECFA- Prague 20007.4.200

A Large Ion Collider Experiment



ALICE in the Czech Republic

ALICE in the Czech Republic

• Institutes:

* Institute of Physics, Prague

* Nuclear Physic Institute, Řež• People (19): D. Adamová, J.Hošek, V.Hanzal, I.Hřivnáčová,

S.Kouchpil,V.Kouchpil, A.Kugler, J.A.Mareš, E.Mihóková, J.Nikl, V.Petráček, K. Píška, K.Polák, M.Šumbera, P.Tlustý, V.Wagner, P.Závada,D.Zákoucký, I. Zborovský

• Activities: Silicon Drift Detectors Low Voltage Supply for Silicon Drift Detectors Scintillation Detectors Physics Off-line


ALICE Inner Tracking SystemALICE Inner Tracking System


View of ITS space frame and SDD laddersView of ITS space frame and SDD ladders

2 layers of Silicon Strip Detectors2 layers of Silicon Drift Detectors 2 layers of Silicon Pixel Detectors

2 layers of Silicon Strip Detectors2 layers of Silicon Drift Detectors 2 layers of Silicon Pixel Detectors


Large area linear Si-drift detector prototypefor ALICE experiment

Large area linear Si-drift detector prototypefor ALICE experiment

• Designed in 1996 by Vojtěch Petráček (NPI Řež) and Pavel Rehak (BNL).

• Innovation w.r.t. previous ALICE prototypes: hexagonal geometry with rectangular active region allowing very simple alignment of detectors on the ladder.

• Mask and detector fabrication @ ASICentrum Prague, ICM Prague and TESLA SEZAM Rožnov pod Radhoštěm.


Basic detector characteristicsBasic detector characteristics

• Rectangular active region 50 x 67 m• 9% of dead region (guard structures)

• Implanted P+ resistor HV divider • 200 anodes on each side of the detector (anode pitch

250 m)• 3 lines of MOS , N+ and N+(AC) charge injection

structures

• Precise openings in metalization for laser-induced charge injection

• Anode structures around the guard zone allows to study leakage currents in this region

• Detector is fabricated on 3.5 kOhm/cm NTD N Si



Laboratory and beam test of ALICE SDD prototypes

Laboratory and beam test of ALICE SDD prototypes


Vojtěch Petráček

Dalibor ZákouckýPavel Tlustý


Beam test of 4” Linear Silicon Drift Detector prototypes


V. Petráček et al.

ALICE INT 99-26


ALICE INT 99-26





ALICE INT 99-26


ALICE INT 99-26


LV power supply for the ITS/SDD - scheme of the ladder part

LV power supply for the ITS/SDD - scheme of the ladder part

V.Petráček:

ALICE ITS TDR

CERN/LHCC 99-12

V.Petráček:

ALICE ITS TDR

CERN/LHCC 99-12


LV power supply for SDD layer of ITSLV power supply for SDD layer of ITSV.Petráček:

ALICE ITS TDR

CERN/LHCC 99-12

V.Petráček:

ALICE ITS TDR

CERN/LHCC 99-12


LVPS module prototype(AREM PRO, Praha)

LVPS module prototype(AREM PRO, Praha)


ALICE Photon Spectrometer PHOS

ALICE Photon Spectrometer PHOS

• 17 280 PWO crystals

• 2.2x2.2x18 cm3

• coupled to large-area PIN-diodes with low-noise preamps

PHOS


Scintillation group, Dept. of Optical Crystal, Institute of Physics, Prague

Scintillation group, Dept. of Optical Crystal, Institute of Physics, Prague

• 1995-7: Development and production (in co-operation with Preciosa Crytur Co.) of large PWO blocks (2x2x0cm) which were used in the ALICE beam tests.

• 1997-2000: Continuation of beam tests. Testing of absorption properties and scintillation characteri-stics of selected PWO crystals, including detailed studies of various doped crystals.

• 2000-2005: Participation in tests, assembly and measurement of characteristics of individual crystals


Transmission spectra at room temperature for three different PWO crystals (L = 18 cm)

Transmission spectra at room temperature for three different PWO crystals (L = 18 cm)

-20

0

20

40

60

80

200 300 400 500 600 700 800 900

PWO 176 crystal

PWO 291 crystal

PWO 340 crystal

Wavelength [nm]

Transmission of three different PWO crystals measured through them (according to their longest side)

ALICE & heavy ion physics Michal Šumbera Nuclear Physics Institute AS CR, Řež.

Documents

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icm prague

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pair production

previous alice prototypes

operation of doublet