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Neutrino Event location Connection from Electric Detector to Emulsion Detector

Neutrino Event location Connection from Electric Detector to Emulsion Detector. Tsutomu FUKUDA Fundamental Particle Physics Lab, Nagoya-univ. 9th March, Workshop “New Developments of Flavor Physics” 2009 @Gamagori. The OPERA Detector. ν. T T. 2.6cm. ECC. 10cm. 12.5cm.

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Neutrino Event location Connection from Electric Detector to Emulsion Detector

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  1. Neutrino Event locationConnection from Electric Detector to Emulsion Detector Tsutomu FUKUDA Fundamental Particle Physics Lab, Nagoya-univ 9th March, Workshop “New Developments of Flavor Physics” 2009 @Gamagori

  2. The OPERA Detector ν TT 2.6cm ECC 10cm 12.5cm Changeable Sheet (CS)

  3. 160micron 600micron The Changeable Sheet (CS) OPERA film x 2 OPERA film OPERA film 10cm Neutrino beam Base 205micron Base 205micron 12.5cm X Z Emulsion layers 44micron

  4. The Changeable Sheet (CS) neutrino 103mm CS ECC Packing and Box install 79mm 128mm

  5. 26mm ECC CS TT 100mm

  6. 26mm ECC CS TT 100mm

  7. 26mm ECC CS TT 100mm

  8. Role : Brick tagging 10cm DONUT OPERA 10cm ECC TT ECC SFT

  9. The Roles of CS • Brick tagging  Saving Scanning load and Target Mass • Pick up tracks from neutrino interaction If we get good Track on CS… We can locate Neutrino interaction easily, because we have experience of Event location in DONUT exp, PEANUT(OPERA rehearsal) exp …

  10. Required Scanning Power OPERA 0μevent 10cm x 12cm OPERA 1μevent DONUT CHORUS 5cm x 5cm 5mm x 5mm 1mm x 1mm 1996 2000 2008 ~

  11. Requirement for CS analysis • Very large scale Scanning Power • Picking up tracks from neutrino interac-tionfrom Scanning Data without fail

  12. S-UTS Speed = 50cm2/hour 50 times of old type machine

  13. Running SUTS Scanning Shift ~90% : CS scanning ~10% : ECC scanning (used 1SUTS) SUTS machine time SUTS Running Speed 4 SUTS (’08 Run) 9.8 CS/day → 68.6 CS/week 5 SUTS (’09 Run~) 12.6 CS/day → 88.2 CS/week

  14. Status of CS Scanning at 2008’Run • 697 CS Scanned (~ 12:00, March 5th, 2009) (day) Middle of July ‘08

  15. 角度精度 ： 15 mrad 位置精度 ： 0.9 micron SUTS Scanning DATA Recognized Tracks in one emulsion layer Total ~ 140M tracks 10cm We must search a few real tracks from neutrino interaction ! 140M tracks  a few tracks 12.5cm

  16. Track selection 1 • 4 layer coincidence

  17. Track selection 1 • 4 layer coincidence ~140M  ~3000

  18. Sigma ~ 5.5 micron Sigma ~ 7.6 micron Track selection 2 • X-ray Alignment X-ray mark Expose X-ray penetrating CS. Spot size ~ diameter 100micron.

  19. Sigma ~ 2.0 micron Sigma ~ 2.0 micron Track selection 2 • Compton Alignment ~3000  ~300 We developed new alignment method. By using compton electron penetrating 2 emulsion layers, we achieved high accuracy alignment.

  20. Likelihood ( signal, noise ) Signal ~ 90% Noise  1/50 Track selection 3 • Track Ranking ~300  ~ 6

  21. Track selection 4 • Manual check Check by eye and judge true track or fake track (compton-electron). ~6  0 Finally, we make prediction for ECC analysis.

  22. Current status - manual check - • Brick finding efficiency ~ 87.9% (421found / 479measured) 479 measured Good track found on CS

  23. Status of CS analysis in OPERA • 421 found /697 Scanned (JAPAN) • 501 found /796 Scanned (EU) To do: • Raise Brick finding efficiency • Raise speed of analysis

  24. Summary • CS is very important for Event location. • CS Scanning is going well. • Performance of Track selection is well. • Brick finding efficiency and analysis speed should be raised furthermore.

  25. The end

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