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

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% charge ID across muon energy range 0-3.5 GeV. ● A new one with helix motion has been done. 05/10/19 3DST weekly 2 / 11

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 05/10/19 3DST weekly 3 / 11

Helix motion state vector ● Five parameters describe the helical motion. http://www-jlc.kek.jp/subg/offl/kaltest/doc/ReferenceManual.pdf 05/10/19 3DST weekly 4 / 11

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 05/10/19 3DST weekly 5 / 11

Performance with displays Contained muon 1.5 T magnetic field Initial state was arbitrarily assigned so needs a little time to follow the track Decay can be traced 05/10/19 3DST weekly 6 / 11

Performance with displays Another contained muon 1.5 T magnetic field 05/10/19 3DST weekly 7 / 11

Performance with displays 1.5 T magnetic field Zoom in the beginning Follow the sharp turn 05/10/19 3DST weekly 8 / 11

Performance with displays 1.5 T magnetic field Perfectly follow all structure 05/10/19 3DST weekly 9 / 11

Performance with displays 1.5 T magnetic field Some events may take longer to follow 05/10/19 3DST weekly 10 / 11

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. 05/10/19 3DST weekly 11 / 11