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NA61/SHINE detector and its capabilities

NA61/SHINE detector and its capabilities. Beam Tracking - TPC Particle identification Calorimetry- PSD. Wojciech DOMINIK. SHIN(E)ing Physics , December 6, 2008. NA61/SHINE at the CERN SPS. LHC. NA61/ SHINE. LHC. NA49. SPS. SPS. NA49 apparatus. Successfully operated until 2002.

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NA61/SHINE detector and its capabilities

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  1. NA61/SHINE detector and its capabilities • Beam • Tracking - TPC • Particle identification • Calorimetry- PSD Wojciech DOMINIK SHIN(E)ing Physics , December 6, 2008

  2. NA61/SHINE at the CERN SPS LHC NA61/ SHINE LHC NA49 SPS SPS

  3. NA49 apparatus Successfully operated until 2002 S. Afanasiev , et al. (NA49 Collaboration), Nuclear Instruments and Methods A430 (1999) 210

  4. NA49 facility: Large acceptance: ≈80% @158GeV High momentum resolution: Good particle identification: High detection efficiency: > 95% Precise and rich physics results: 37 publications with final data Tested in 2006 and 2007 runs: No degradation of the performance since the beginning of operation Reconstruction, calibration, simulation and analysis software works All necessary experts are in the collaboration Report from the test run: CERN-SPSC-2006-023, SPSC-SR-010(September 5, 2006)

  5. NA61 and basic upgrades:

  6. Upgraded NA49 apparatus NA49: Nucl. Instrum. Meth. A430, 210 (1999) Upgrades: CERN-SPSC-2006-034, SPSC-P-330

  7. Basic upgrades: • 2007: • Modification and replacement of obsolete equipment, • construction of the forward ToF wall • re-establish the full functionality of NA49 • 2008: Replacement of the TPC digital read-out and DAQ: • an increase of the event rate by about 20 to 80 Hz • 2011: • Projectile Spectator Detector: • an increase of the resolution in the measurement ofthe number of projectile spectators by a factor ≈5to ∆E/E ≈ 50%/E, • Installation of the Helium beam pipe in the VTPC cage • reduction of the delta-electron background bya factor of 10

  8. Secondary hadron beams for NA61: Beam and trigger counters C1 and C2 - proton identification, S1, S2, V0, V1, BPD1/2/3 – determination of proton trajectory, S4 – selection of p+target interactions

  9. Beam Position Detectors • 3 x 3 cm2 proportional chambers with cathode strip readout • Two orthogonal sense wire planes (15 μm tungsten wires with 2 mm pitch) • Central cathode plane and cathode strip planes and windows are madeof 25 μm aluminized Mylar • Operated withAr/CO290/10 gas mixture

  10. Tracking detectors- Time projection Chamber (TPC) TPC - tracking of charged particles • 180000 sampling pixels for all TPC's • 62 MWPC modules Main Time Projection Chamber * 2 • readout surface of 3.9x3.9 m2 • depth of the field cage of 1.1 m • gas mixture: Ar+CO2+CH4→ Ar+CO2 (94/6) • up to 90 measured points on a trajectory • 25 proportional chambers Vertex Time Projection Chamber * 2 • gasbox of 2.0x2.5 m2 surface area • Depth of field cage 0.67 m • gas mixture: Ar/Ne+CO2 (90/10) • 6 proportional chambers • up to 72 measured points on a trajectory • Magnetic field – up to 1.5 Tesla

  11. The 2007 pilot run: p+C at 31 GeV/c

  12. Particle identification by dE/dx measurement p+p p+Pb NA61 2007 pC data NA49

  13. Particle identification by combined dE/dx and TOF measurement NA61 2007 pC data NA49 Pb+Pb collisions momentum range 5–6 GeV/c

  14. Projectile Spectator Detector (PSD) – NA61 calorimeter Role of the PSD in NA61 • Precise determinationof the number of projectile spectatorsin the NA61 ion programme • Measurement of centrality: b~ A - Nspect (selection of centrality at trigger level) • Measurement of event-by-eventfluctuations (to exclude the fluctuation of participants) • Reconstruction of the reaction plane Main features of the PSD • high granularity: 12 x 9 array of modules (10x10x125 cm3) transverse homogeneity of energy resolution, • compensated calorimeter (e/h = 1), lead/scintillator sampling ratio 4:1 high energy resolution ~50%/sqrt(E) should be achieved • longitudinal segmentation (10 sections per module calibration, improve energy resolution • light readout from each sections by novel MAPDs provide large dynamic range (range of the detected energies – 10-30000 GeV)

  15. MAPDs and amplifiers. Projectile Spectator Detector – NA61 calorimeter NA61 Single PSD module: • 60 lead/scintillator sandwiches • 10 longitudinal sections • 6 WLS-fiber/MAPD • 10 MAPDs/module • 10 Amplifiers with gain~40 F. Guber, A.Ivashkin - INR, Moscow

  16. h • - SINGLE PHOTON SENSITIVITY • VERY GOOD TIME RESOLUTION: 50-100 ps • - “PROPORTIONAL” TO INPUT SIGNAL • - HIGH Q.E. ~ 80% (POTENTIALLY) • - OPERATION IN HIGH MAGNETIC FIELD • - LOW COST R 50 Substrate HIGH SINGLE ELECTRON NOISE (100 kHz-1MHz) SiPM - SOLID STATE PHOTON DETECTORS First proposed by Golovin and Sadygov in the 90’s MATRIX OF INDEPENDENT GEIGER PHOTODIODE PIXELS NAMED : SILICON PHOTOMULTIPLIER (SiPM) MULTI-PIXEL PHOTON COUNTER (MPPC) AVALANCHE MICROCHANNEL PHOTODIODE (AMPD) GEIGER MODE AVALANCHE PHOTODIODES (G-APD) MULTIPIXEL AVALANCHE PHOTODIODE (MAPD)

  17. G. COLLAZUOL (ITC-irst) INFN Pisa 2007

  18. Properties of MAPDs • New generation of micro-pixel APD produced in Singapore by Zecotek • Active area: 3x3 mm2 • - Number of pixel: up to 40000/mm2 • - Gain ~ few x 104 • Voltage ~65 V • - Dark current ~50 nA • - High stability

  19. Module assembling at INR

  20. Calibration of modules with 75 GeV muon beam (2007) Run 5362 mod 1 l.y~2ph.e/MeV

  21. Performance of PSD supermodule2007 hadron data Energy resolution of 3x3 prototype: stochastic term ~ 54% constant term ~ 1.9%

  22. …progress in MAPDs development since beginning of 2008 • Photon detection efficiency (PDE): • 420nm 550nm • MAPD3A 12% 20% • New MAPD3 23% 37% • 2. Signal shape: • new MAPD3MAPD3A F. Guber, A.Ivashkin - INR, Moscow -rise time7 ns10 ns -full width40 ns50 ns

  23. Two proposed options of the PSD structure F. Guber, A.Ivashkin - INR, Moscow option 1 option 2 -108 modules, - Each module ~ 125 kG - can be used for reaction plane meas? - Total cost about 1 000 000 CHF • - 40 modules (20 small +20 large ones) • - Each large module ~ 500 kG!! • - can be used for reaction plane meas? • Total cost about 670 000 CHF

  24. Performance of the NA61 detector: Results of the 2007 run: Large acceptance: ≈50% High momentum resolution: at full magnetic field Good particle identification: High detector efficiency: > 95%

  25. The 2007 pilot run: Upgrades Data Additional ToF p+C at 31 GeV/c R&D on thin target and PSD prototype T2K replica target

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