Helix Kalman fjleter for 3DST-S Guang Yang 05/10/19 3DST weekly - - PowerPoint PPT Presentation

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Helix Kalman fjleter for 3DST-S Guang Yang 05/10/19 3DST weekly - - PowerPoint PPT Presentation

Nov 10, 2022 486 likes •612 views

Helix Kalman fjleter for 3DST-S Guang Yang 05/10/19 3DST weekly 1 / 11 Motivation We need a way to evaluate magnetic fjeld requirement. We used to have a kalman fjlter with projectile motion inside 3DST, which provides > 90%

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SLIDE 1

05/10/19 3DST weekly 1 / 11

Helix Kalman fjleter for 3DST-S

Guang Yang

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SLIDE 2

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Motivation

  • We need a way to evaluate magnetic fjeld

requirement.

  • We used to have a kalman fjlter with projectile

motion inside 3DST, which provides > 90% charge ID across muon energy range 0-3.5 GeV.

  • A new one with helix motion has been done.
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SLIDE 3

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Kalman fjlter

  • Principle: Update the predicted state vector at a site,

using all measurements up to this site using “kalman gain”

  • Needed components:
  • state vector: describe the particle at a site
  • propagator: describe the motion
  • measurement vector: describe the particle in detector

coordinate

  • Mapping between detector

coordinate and state vector

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SLIDE 4

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Helix motion state vector

  • Five parameters describe the helical motion.

http://www-jlc.kek.jp/subg/offl/kaltest/doc/ReferenceManual.pdf

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SLIDE 5

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Measurement vector and mapping

  • Detector coordinate : x, y , z
  • No energy deposit information used

http://www-jlc.kek.jp/subg/offl/kaltest/doc/ReferenceManual.pdf

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Performance with displays

Decay can be traced Contained muon Initial state was arbitrarily assigned so needs a little time to follow the track 1.5 T magnetic field

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SLIDE 7

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Performance with displays

Another contained muon 1.5 T magnetic field

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SLIDE 8

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Performance with displays

Zoom in the beginning Follow the sharp turn 1.5 T magnetic field

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SLIDE 9

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Performance with displays

Perfectly follow all structure 1.5 T magnetic field

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SLIDE 10

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Performance with displays

Some events may take longer to follow 1.5 T magnetic field

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SLIDE 11

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Next steps

  • The helix fjlter is ready.
  • Need a little more time do provide performance plots.
  • Plan to do performance evaluation for 3DST + TPC

with difgerent B-fjeld.