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Report from NA61/SHINE measurements for 7 Be + 9 Be at CERN/SPS energies

Report from NA61/SHINE measurements for 7 Be + 9 Be at CERN/SPS energies. Roman Płaneta Jagiellonian University , Kraków for the NA61/SHINE collaboration. run 15 012, 150A GeV /c event 417. GDR 2010, 30th April, Paris.

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Report from NA61/SHINE measurements for 7 Be + 9 Be at CERN/SPS energies

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  1. Report from NA61/SHINE measurements for 7Be + 9Be atCERN/SPS energies Roman Płaneta JagiellonianUniversity, Kraków for the NA61/SHINE collaboration run 15012, 150A GeV/c event 417 VIII-th Polish Workshop on Relativistic Heavy-Ion Collisions GDR 2010, 30th April, Paris

  2. Data sets recorded andto be recorded by NA61 within the ion program NA61 ion program NA49 (1996-2002) Pb+Pb Pb+Pb 2015 Xe+La Si+Si Ar+Ca 2014 C+C Be+Be 2011-2012 p+p p+p 2009/10/11 13 20 30 40 80 160 13 20 30 40 80 160 p+Pb 2012/14 energy (A GeV) energy (A GeV) VIII-th Polish Workshop on Relativistic Heavy-Ion Collisions

  3. Main upgrades: TPC read-out - an increase of the data rate by a factor of 10 compared to the NA49 rate TOF-F detector -acceptance X 2 ProjectileSpectatorDetector- with a resolution of 1nucleon He beam pipe -reduction of the δ-electron background by a factor of 10 Z-detector- measure ioncharge for on-line selection of secondary ions A-detector- measures mass composition of secondaryion beam Detector VIII-th Polish Workshop on Relativistic Heavy-Ion Collisions

  4. Secondary Bebeam: basic idea Pb primary Pb beam from the SPS fragmentation target Pb fragments fragment separator VIII-th Polish Workshop on Relativistic Heavy-Ion Collisions

  5. Secondary Bebeam: fragment separator • Fragmentation target (T2) lengthoptimized to the desired fragmentproduction • The beam line is a double spectrometer with 0.04% resolution that helps to separate ion fragments corresponding to a selected magnetic rigidity Bρ • Degrader (Cu plate where ions loseenergy dE/dx ~ Z2) allow to reachrequired beam purity at lowerenergies T2 target 18 cm, Be Degrader 1 cm, Cu dE/dx ~ Z2 VIII-th Polish Workshop on Relativistic Heavy-Ion Collisions

  6. Projectile and target 9Be target: • thickness 1.2 cm for most of the runs • onlyfor 75A GeV/c runs the 1.2 and0.3 cm 9Be targetswereused, interactionprobability: 8% and 2%, respectively • 7Be projectile: • longlivingisotope of beryllium • 6Be unstable, for 8Be T1/2 ≈ 10-16 s 1.2cm * 2.5 cm * 2.5 cm

  7. Time structure of the beam • The complete SPS revolution time is • 22.7μsec. • Presently we have 2 injections. An injection results in a batch. • The batches contain about 3*10+8ions. • The batches are spaced by 8μsec. • The batches contain 2 bunches. • The bunches are spaced by 200nsec inside a batch. VIII-th Polish Workshop on Relativistic Heavy-Ion Collisions

  8. Beampropertiesmeasured by BeamPositionDetectors (BPD) 75AGeV/c run 15101 40AGeV/c run 15268 Beam tracks – BPD2 to end of MTPC VIII-th Polish Workshop on Relativistic Heavy-Ion Collisions

  9. Z - detector Be/all=11.2% QuartzCherenkovdetector Be/all=6.9% Be/all=4.0% VIII-th Polish Workshop on Relativistic Heavy-Ion Collisions

  10. A - detector 11C 12C scintillatorread-out by twoPMTs, measures mass and chargeof ions (tof and Z2 ), located 140 metersupstream of the NA61 target σ(tof) ≈ 100 ps VIII-th Polish Workshop on Relativistic Heavy-Ion Collisions

  11. A-detversusZ-det 75A GeV/c Run 15161,target IN 7Be VIII-th Polish Workshop on Relativistic Heavy-Ion Collisions

  12. PSD – Projectile Spectator Detector Ready in 2011 for the high SPS energies , to be extended in 2012 for the low SPS energies 44 modules 2011: 32 modules (16 small and 16 large) • Compensating calorimeter • Pb/scintillator (4/1) sandwich • Modules 10 x 10 x 120 cm3 • and 20 x 20 x 120 cm3 Used in the trigger • Precise measurement of the energy • of projectile spectators. • centrality selection (on trigger level) • measurement of event-by-event fluctuations (to reduce Npart fluctuations) • Reconstruction of the reaction plane VIII-th Polish Workshop on Relativistic Heavy-Ion Collisions

  13. Triggerdefinitions T1 – Be beamtrigger T2 - interactiontrigger T4 – beamtrigger S1 V0 V0’ Z-detector V1 Target Beam BPD1 BPD2 BPD3 VIII-th Polish Workshop on Relativistic Heavy-Ion Collisions

  14. PSD performance 40AGeV/c Run 15258 special, target IN trigger S1 75AGeV/c Run 15161, target IN Beamtrigger 150AGeV/c Run 14946, target OUT Alltriggers He He Be He Be Be Beam momentum (AGeV/c) 4075 150 Etotal(GeV)Resol. ( %) Etotal(GeV) Resol. (%) Etotal(GeV) Resol. (%) 2H 80 11.8 150 9.2 300 6.6 4He1608.1 300 7.0 600 6.7 7Be280 6.4525 6.1 1050 4.1 VIII-th Polish Workshop on Relativistic Heavy-Ion Collisions

  15. Correlation of PSD energy versusZ-det 75AGeV/c Run 15161, target IN 7Be d He Be Spectrum of PSD energy for all triggers VIII-th Polish Workshop on Relativistic Heavy-Ion Collisions

  16. Energy in PSD 75AGeV/c Run 15161 target IN W/o Z cuts Beamtrigger Z cuts are applied Be beamtrigger VIII-th Polish Workshop on Relativistic Heavy-Ion Collisions

  17. Energy in PSD 7Be beamtrigger 7Be beamtrigger 7Be beamtrigger VIII-th Polish Workshop on Relativistic Heavy-Ion Collisions

  18. 7Be + 9Be @ 150A GeV/c, run 15012 TPC tracks event 515, high multiplicity event 417, medium multiplicity event 381, low multiplicity VIII-th Polish Workshop on Relativistic Heavy-Ion Collisions

  19. Pb + Pb @ 80A GeV/c TPC tracks VIII-th Polish Workshop on Relativistic Heavy-Ion Collisions

  20. 7Be + 9Be @ 150A/c GeV TPC vertexposition VIII-th Polish Workshop on Relativistic Heavy-Ion Collisions

  21. 2011 Be run: data statistics 5.12 31.11 16.11 21.11 26.11 10.12

  22. 2011 Be run: data statistics • Be+Be at 150A GeV/c: 3.12M events • Be+Be at 75A GeV/c: 5.09M events • Be+Be at 40A GeV/c: 3.39 M events • Pb+Pb at 80A GeV/c: 141k events VIII-th Polish Workshop on Relativistic Heavy-Ion Collisions

  23. Summary • the data taking for Be+Be interactions at 40A, 75A and 150A GeV/c was completed as planed • performace of allsubsystemsduring the Beryllium run was good • Be+Bemeasurements for 13A, 20A and 30A GeV/c • will be conducted in 2012 • performace of ourexperimental set upfor measurements • with primaryArand Xe beams in 2014 and 2015 was testedusingPb+Pb collisions at 80A GeV/c VIII-th Polish Workshop on Relativistic Heavy-Ion Collisions

  24. The NA61/SHINE Collaboration University of Athens, Athens, Greece University of Belgrade, Belgrade, Serbia University of Bergen, Bergen, Norway University of Bern, Bern, Switzerland KFKI IPNP, Budapest, Hungary Jagiellonian University, Cracow, Poland Joint Institute for Nuclear Research, Dubna, Russia Fachhochschule Frankfurt, Frankfurt, Germany University of Frankfurt, Frankfurt, Germany University of Geneva, Geneva, Switzerland Forschungszentrum Karlsruhe, Karlsruhe, Germany Institute of Physics, University of Silesia, Katowice, Poland Jan Kochanowski Univeristy, Kielce, Poland Institute for Nuclear Research, Moscow, Russia University of Nova Gorica, Nova Gorica, Slovenia LPNHE, Universites de Paris VI et VII, Paris, France Faculty of Physics, University of Sofia, Sofia, Bulgaria St. Petersburg State University, St. Petersburg, Russia State University of New York, Stony Brook, USA KEK, Tsukuba, Japan Soltan Institute for Nuclear Studies, Warsaw, Poland Warsaw University of Technology, Warsaw, Poland University of Warsaw, Warsaw, Poland Univeristy of Wroclaw, Wroclaw, Poland Universidad Tecnica Federico Santa Maria, Valparaiso, Chile RudjerBoskovic Institute, Zagreb, Croatia ETH Zurich, Zurich, Switzerland VIII-th Polish Workshop on Relativistic Heavy-Ion Collisions

  25. Additional slides VIII-th Polish Workshop on Relativistic Heavy-Ion Collisions

  26. 7Be-1024 GeV 4He- 520 GeV 2H-253 GeV PSD spectrum – calibration of scale E1n(7Be)=150 GeV But E1n(4He)=130 GeV Why? The reason is rigidity of beam r=P/Z=const. P1n(4He)x4/2=P1n(7Be)x7/4 P1n(7Be)x7=P1n(4He)x4/2x4=P1n(4He)x8 VIII-th Polish Workshop on Relativistic Heavy-Ion Collisions

  27. He beam pipe Ar+CO2 • Measurements show significant decrease of secondary interactions with He beam pipes installed CO2 He 30 mm Tedlar Position of the reconstructedinteraction point along the beam direction p+p collisions at 158 GeV Without He beam pipes With He beam pipes VIII-th Polish Workshop on Relativistic Heavy-Ion Collisions

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