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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.

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slide1

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 [email protected] Hirosaki University

slide2

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

slide3

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

slide4

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

slide5

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

slide6

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

slide7

The New Station 3 Drift Chamber(s)

1.7 m

3.5 m

Florian Sanftl @ JPS autumn meeting 2011

slide8

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

slide9

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

slide10

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

slide11

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

slide12

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

slide13

Backup: SomeGeometry

U & U’

X & X’

Sense wire

edge

TDC data

Florian Sanftl @ JPS autumn meeting 2011

slide14

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

slide15

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

slide16

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

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