1 / 16

September 17th 2011, JPS autumn meeting @ Hirosaki University

Commissioning Status of the Drift Chamber for a Di-Muon Spectrometer at the E906/ SeaQuest Experiment at Fermilab. 東工大 ， 理研 A ，高エネ機構 B ， 山形大 C Florian Sanftl ， 後藤雄二 A ，澤田真也 B ， 柴田利 明， 竹内 信 太郎， 竹谷篤 A ，中野 健一， 宮坂 翔，宮地義之 他 E906 / SeaQuest Collaboration.

oriana
Download Presentation

September 17th 2011, JPS autumn meeting @ Hirosaki University

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Commissioning Status of the Drift Chamber for a Di-Muon Spectrometer at the E906/SeaQuest Experiment at Fermilab 東工大，理研A，高エネ機構B，山形大CFlorian Sanftl，後藤雄二A，澤田真也B，柴田利明，竹内信太郎，竹谷篤A，中野健一，宮坂翔，宮地義之他 E906 / SeaQuest Collaboration September 17th 2011, JPS autumnmeeting@ Hirosaki University

  2. Outline • SeaQuest: Physics Motivation • SeaQuest: Spectrometer • Drift Chamber(s): Design and Specifications • Experimental Setup @ Tokyo Tech • Results: Turn on curve • Track Reconstruction Algorithm • Results: XT-Curve • Conclusion Florian Sanftl @ JPS autumn meeting 2011

  3. xtarget xbeam SeaQuest: Drell-Yan & Anti-Quarks in a Nutshell Sawada-san’s talk: 18pSL-6 Beam Energy:120 GeV/ 800 GeV E906 Spect. Monte Carlo Detector acceptance chooses xtarget and xbeam: • Fixed target -> high xF = xbeam – xtarget • Valence Beam quarks at high-x. • Sea Target quarks at low/intermediate-x. • Drell Yan as a perfect tool to probe Anti-Quarks Florian Sanftl @ JPS autumn meeting 2011

  4. 4.9m SeaQuest: Spectrometer Station 4: Hodoscope array Prop tube tracking Philosophy: Redo, Reuse, Recycle Station 2 and 3: Hodoscope array Drift Chamber tracking Station 1: Hodoscope array MWDC tracking Solid IronFocusing Magnet, Hadron absorber and beam dump Mom. Meas. (KTeV Magnet) St. 3Plus: NEW from E906J Hadron Absorber (Iron Wall) 25m Liquid H2, d2, and solid targets (e.g. Fe, Ca, C) Drawing: T. O’Connor and K. Bailey Florian Sanftl @ JPS autumn meeting 2011

  5. The New Station 3 Drift Chamber(s) • 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) V’ V X’ X U’ U Florian Sanftl @ JPS autumn meeting 2011

  6. The New Station 3 Drift Chamber(s) • 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) Florian Sanftl @ JPS autumn meeting 2011

  7. The New Station 3 Drift Chamber(s) 1.7 m 3.5 m Florian Sanftl @ JPS autumn meeting 2011

  8. Test Chamber: Setup Cosmic 1.7 m Scinti.PMT Discri. Drift Chamber ASDQ card Level Shifter Board LVDS To NIM Stop TDC PC 0.7 m Start Scinti. + PMT Discri. Coincidence • Read-Out Electronics same as SeaQuest • ASDQ = Amplifier, Signal Shaper, Discriminator &Charge Injector • Controlled by Level Shifter Board (Set thresholds, Ethernet access etc. pp.) • 48 Channels (= 6 x 8) • Coincidence as Trigger Start, Common Start Setup • Cosmic Rays are used  no defined incident angle (range of ~10°) Florian Sanftl @ JPS autumn meeting 2011

  9. Single Layer DetectionEfficiencies • Results: • The Single layer efficiency increases with increasing High Voltage • Single Layer efficiency reaches 95±5%@ -2.65kV • Uncertainties are investigated (accidental coincidence) • Discriminator Threshold on MAX • Some conclusions: • Some little space for improvement • (Rough estimate for track reconstruction eff. 74.4% for 5 hits minimum requirement) Florian Sanftl @ JPS autumn meeting 2011

  10. Tracking: Algorithm Reconstructed track Projected DCA Accepted Hits • Selections & definitions: • Drift time = TDC – t0 • Same t0 for all channels • Drift time window: 520ns • Accept event when4 < Number of hits < 11per layer Florian Sanftl @ JPS autumn meeting 2011

  11. Tracking: PreliminaryResults • XT extraction: • 1st Iteration • Extracted curve agrees well with input curve within uncertainties • Still too little statistics from the edge of cell • Deviation simulation/measurement: • Green bands is width of the projections • Those are constant over a wide T range • Band: Superposition of uncertainties from hit reconstruction and track reconstruction • Disentanglement of both effects is investigated Florian Sanftl @ JPS autumn meeting 2011

  12. Conclusionsand Outlook • SeaQuest is a fixed target experiment at Fermilab • SeaQuest is going to measure the flavor asymmetry of the nucleon sea • Commissioning is going to start in autumn 2011 • The Japanese collaboration constructed and built a new DC • In order to prepare for the beam we setup the software package based in our test chamber in Tokyo • We reported on the first extraction of an XT curve based on cosmic data • The Tracking algorithm is working properly • We have to move forward a complete calibration • The uncertainties have to be better understood and investigated Florian Sanftl @ JPS autumn meeting 2011

  13. Backup: SomeGeometry U & U’ X & X’ Sense wire edge TDC data Florian Sanftl @ JPS autumn meeting 2011

  14. Backup: TDC distributions • Observation • Discrepancy between simulation and measurement • Account for that in the T2Xconversion Simulated result Measured result 250 ns 350 ns Florian Sanftl @ JPS autumn meeting 2011

  15. Backup: GasGain • R : ±5% • : ±15% ＋5% • : ＋15% • : ±10% • : ±25% • Density of gas : ±5% • Diameter of sense wire (±10%) : ±80% < Systematic errors> Total : • Note: The effect of the diameter of sense wires on the gas gain is large. • The gas gain was • The gas gain increases when the HV value increases. • The measured results and the simulated results agree in order of magnitude. • The measured value is about twice the simulated value. • The measured result shows the better gas gain in our measurement. • The measured and the simulated results are consistent within errors <Estimated change in gas gain> Diameter of sense wire : 30 μm 29.4 μm (): 110% 28.5 μm (): 130% 27.0 μm (): 180% 26.5 μm (): 200% 25.0 μm (): 290% Florian Sanftl @ JPS autumn meeting 2011

  16. Backup: Tracking Algorithm v2 • Cuts: • TDC Cuts • Number of events cuts • Sam t0 for all channels • 5 layers • … more Algo details • Results: • Good agreement • More iterations • More data • Tracking efficiencies • Position resolution Florian Sanftl @ JPS autumn meeting 2011

More Related