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2011 年 10 月 24 日 , GCOE コロキウム @ 東工大

Commissioning Status of the Drift Chamber for a Di-Muon Spectrometer at the E906/ SeaQuest Experiment at Fermilab. Florian Sanftl , 柴田研究室. 2011 年 10 月 24 日 , GCOE コロキウム @ 東工大. Outline. Physics Motivation & Introduction E906/ SeaQuest : Physics Goal Muon Pair Spectrometer

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2011 年 10 月 24 日 , GCOE コロキウム @ 東工大

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  1. Commissioning Status of the Drift Chamber for a Di-Muon Spectrometer at the E906/SeaQuest Experiment at Fermilab Florian Sanftl, 柴田研究室 2011年10月24日, GCOEコロキウム@ 東工大

  2. Outline • Physics Motivation & Introduction • E906/SeaQuest: Physics Goal • Muon Pair Spectrometer • Design and Commissioning of Drift Chamber built by Japanese Group • Track Reconstruction Algorithm / XT curve / position resolution of charged particles • Conclusion & Outlook GCOEコロキウム @ 東工大

  3. 1) Physics Introduction & Motivation What is the Proton? Sea-quarks Proton Gluons e+ Photon e- • Three “Valence” quarks • 2 “up” quarks (q = +⅔) • 1 “down” quark (q = -⅓) • Bound together by gluons • Gluons can split into quark-antiquark pairs (similar to the photon splitting into a electron-positron pair) • The Proton “Sea” is formed ofquarks and antiquarks GCOEコロキウム @ 東工大

  4. Purpose of our Study Is ū = đ valid in the Proton?Is there a Flavor Asymmetry of Anti-quarks in the Proton?đ - ū≠ 0? đ/ū≠ 1? GCOEコロキウム @ 東工大

  5. How can we measure Sea-Quarks? Drell-Yan Process 90° Rotation Proton / Beam Proton / Target Proton • Electron beam scatters off a proton • Electromagnetic interaction between electron and quark • Comparing electron before and after interaction reveals information about the proton structure • Proton beam scatters off a proton • Quark and anti-quarks annihilate into virtual photon • Virtual photon decays into two muons • Anti-quarks can be selected Deep Inelastic Scattering (DIS) GCOEコロキウム @ 東工大

  6. Importance of ‘Bjorken-x’ xB and Q2 • Q2:4-momentum transferred squared (“virtuality of photon”)Q2 = -q2 = 2EeE’e(1+cosθl) • Alternative way for Q2:Q2 also represents spatial resolution where proton is probedr = hc/Q = 0.2fm/Q[GeV]typically Q2 > 1GeV2, r < 0.2*10-15 m • Bjorken-x:xB = fractional momentum carried by the struck quarkxB = pQUARK / pPROTON 0 ≤ xB ≤ 1 • q(xB,Q2):probability to hit a quark with flavour q, xB and Q2 GCOEコロキウム @ 東工大

  7. Experimental Results • NA51 (Drell-Yan) • NMC (Gottfried Sum Rule) • E866/NuSea (Drell-Yan) đ - ū đ / ū ū ≠ đ Unknown effects apparently dilutes meson cloud effects at large-x GCOEコロキウム @ 東工大

  8. Main Injector 120 GeV Tevatron 800 GeV 2) The E906/SeaQuest Experiment • Old Experiment:Fermilab E866/NuSea • 1H, 2H, and nuclear targets • 800 GeV proton beam • New Experiment:Fermilab E906/SeaQuest • 1H, 2H, and nuclear targets • 120 GeV proton Beam • Higher Cross section and • Less Background • 50x statistics!! Fixed Target Beam lines GCOEコロキウム @ 東工大

  9. Physics Goal E906/Drell-Yan will extend old measurements toxB values > 0.3 and reduce statistical uncertainty. GCOEコロキウム @ 東工大

  10. 4.9m 3) Muon Pair Spectrometer Station 4: Hodoscope array Prop tube tracking Station 2 and 3: Hodoscope array Drift Chamber tracking Station 1: Hodoscope array MWPC tracking Solid IronFocusing Magnet, Hadron absorber and beam dump Station 3: NEW from Tokyo Tech Mom. Meas. (KTeV Magnet) Hadron Absorber (Iron Wall) 25m Liquid H2, d2, and solid targets Drawing: T. O’Connor and K. Bailey GCOEコロキウム @ 東工大

  11. Motivation: Re-do, Re-use & Re-cylce Expect to start collecting data this autumn! • St. 4 Prop Tubes: Homeland Security via Los Alamos • St. 3 & 4 Hodo PMT’s: E-866, HERMES, KTeV • St. 1 & 2 Hodoscopes: HERMES • St. 2 & 3Minus- tracking: E-866 • St. 3: NEW from Japanese Collaborators • St. 2 Support Structure:KTeV • Target Flasks: E-866 • Cables: KTeV • 2nd Magnet: KTeV Analysis Magnet • Hadron Absorber: Fermilab Rail Head??? • Solid Fe Magnet Coils: E-866 SM3 Magnet • Shielding blocks: old beamline (Fermilab Today) • Solid Fe Magnet Flux Return Iron: E-866 SM12 Magnet GCOEコロキウム @ 東工大

  12. Spectrometer Top View μ+ 25 m GCOEコロキウム @ 東工大

  13. 4) Design of the New Drift Chamber μ+ / μ- • General Performance requirements • Detection Area:1.6 m (vertical) x 2.2 m (horizontal) • 6 Active layers:U/U’ (+14°), X/X’ (0°), V/V’ (-14°) • Position resolution: < 400 μm per plane • Gas Selection: • For now: Argon:CO2 (80:20) • Cell Structure • Cell width& height 20 mm • Wire spacing 10 mm • Diameter sense wire (Au-W) 30 μm, others (Au-CuBe) 80 μm • Performance Parameters • Gas-gain ~4.0E5 • Drift velocity 3-6 cm / μsec (Ar:CO2) V’ V X’ X U’ U GCOEコロキウム @ 東工大

  14. Commissioning Timeline STATUS of Station 3+ DC June, 2009 January, 2010 March, 2010 July, 2010 Now Design completed Fabrication completed Transport to RIKEN Tests at RIKEN Transport to Fermilab Tests at Fermilab Installation & Setup in Spectrometer GCOEコロキウム @ 東工大

  15. 5) Track Reconstruction Algorithm Reconstructed track Cosmic Ray Scintillator Projected distance Iteration Accepted Hits Scintillator • We are measuring: • Coincidence between bottom and top scintillator caused by cosmic rays • Time difference between coincidence and signal from chamber GCOEコロキウム @ 東工大

  16. Results and Discussion • XT extraction: • 1st Iteration • Extracted curve agrees well with input curve within uncertainties • Still too little statistics from the edge of cell • Deviation simulation between measurement: • Green bands is width of the projections • Those are constant over a wide T range • Band corresponds to position resolution of 500μm • Tilting behavior due to statistical effects GCOEコロキウム @ 東工大

  17. 6) Conclusion and Outlook • E906/SeaQuest is a Drell-Yan experiment • It measures the asymmetry of anti-quarks in the proton • Tokyo Tech group designed and built and a new drift chamber • We prepared a Track Reconstruction Algorithm • Algorithm is working well • We already achieved a position resolution of 500μm which is very close to the design value of 400μm • Improvement by more iterations • We are ready for the first beam in November 2011!!! GCOEコロキウム @ 東工大

  18. The E906 Collaboration Fermi National Accelerator Laboratory Chuck BrownDavid Christian University of Illinois Bryan DannowitzDan JumperBryan KernsNaomi C.R MakinsJen-Chieh Peng KEK Shin'ya Sawada Ling-Tung University Ting-Hua Chang Los Alamos National Laboratory Gerry GarveyMike LeitchHan LiuMing Xiong LiuPat McGaughey University of Maryland Prabin AdhikariBetsy BeiseKaz Nakahara University of Michigan Brian BallWolfgang LorenzonRichard Raymond National Kaohsiung Normal University Rurngsheng GuoSu-Yin Wang RIKEN Yuji GotoAtsushi TaketaniYoshinori FukaoManabu Togawa Rutgers University Lamiaa El FassiRon GilmanRon RansomeElaine SchulteBrian TiceRyan ThorpeYawei Zhang Texas A & M University Carl GagliardiRobert Tribble Thomas Jefferson National Accelerator Facility Dave GaskellPatricia Solvignon Tokyo Institute of Technology Toshi-Aki Shibata Kenichi Nakano Florian Sanftl Shintaro Takeuchi ShouMiyasaka Yamagata University Yoshiyuki Miyachi Abilene Christian University Obiageli AkinbuleBrandon BowenMandi CrowderTyler HagueDonald IsenhowerBen MillerRusty TowellMarissa WalkerShon WatsonRyan Wright Academia Sinica Wen-Chen ChangYen-Chu ChenShiu Shiuan-HalDa-Shung Su Argonne National Laboratory John ArringtonDon Geesaman*Kawtar HafidiRoy HoltHarold JacksonDavid PotterveldPaul E. Reimer*Josh Rubin University of Colorado Joshua BravermanEd KinneyPo-Ju LinColin West GCOEコロキウム @ 東工大

  19. LA-LP-98-56 Flavor Asymmetry: Models • Pauli Blocking:Excess of up-quarks permits creation of up-anti-up-pairs • Meson Cloud in the nucleon—Sullivan process in DIS Antiquarks in spin 0 object → No net spin • Chiral Quark models—effective Lagrangians • Instantons • Statistical Parton Distributions GCOEコロキウム @ 東工大

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