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VERSION:2.0
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SUMMARY:Studies on the RICH Velocity Reconstruction with a Likelihood Appr
 oach. Features and Variability Corrections
DTSTART:20251118T140000Z
DTEND:20251118T160000Z
DTSTAMP:20260811T171814Z
UID:124f2471-b277-4b59-93d0-de06a88dc419
SEQUENCE:2
CREATED:20251114T143016Z
DESCRIPTION:The Alpha Magnetic Spectrometer (AMS) is a particle physics de
 tector operating on the International Space Station\, designed for long-te
 rm precision measurements in space. A key objective of AMS is the isotopic
  separation of cosmic rays\, providing crucial insight into their origin\,
  propagation\, and composition. Achieving accurate isotopic separation dep
 ends critically on the mass resolution\, which is strongly determined by t
 he velocity resolution at high energies.The Ring Imaging Cherenkov Detecto
 r (RICH) is the AMS subdetector responsible for high-precision velocity me
 asurements in the upper energy range. Improving its velocity resolution is
  therefore essential to extending AMS sensitivity to isotopic identificati
 on in previously unexplored energy domains.The RICH determines particle ve
 locities by reconstructing Cherenkov ring patterns produced as particles t
 raverse one of its radiator materials\, aerogel or sodium fluoride.This wo
 rk reports possible improvements to the velocity reconstruction performed 
 by the LIP likelihood-based algorithm.One enhancement involves exploiting 
 Cherenkov photons emitted from the plastic foil support below the radiator
 . Jointly reconstructing the rings from both the foil and the radiator is 
 expected to improve velocity resolution for high-charge particles.A second
  improvement addresses time-dependent biases in reconstructed velocities. 
 Periodicities of 60 days and one year\, linked to the temperature dependen
 ce of radiator refractive indices\, and a long-term drift from light guide
  and aerogel ageing are identified. Modeling these effects enables time- a
 nd temperature-dependent corrections to the refractive index and emission 
 point used in reconstruction.
LAST-MODIFIED:20251114T143026Z
LOCATION:Online
URL:http://df.vps.tecnico.ulisboa.pt/pt/eventos/studies-on-the-rich-veloci
 ty-reconstruction-with-a-likelihood-approach-features-and-variability-corr
 ections/
X-ALT-DESC;FMTTYPE=text/html:<p data-block-key="ujwkl">The Alpha Magnetic 
 Spectrometer (AMS) is a particle physics detector operating on the Interna
 tional Space Station\, designed for long-term precision measurements in sp
 ace. A key objective of AMS is the isotopic separation of cosmic rays\, pr
 oviding crucial insight into their origin\, propagation\, and composition.
  Achieving accurate isotopic separation depends critically on the mass res
 olution\, which is strongly determined by the velocity resolution at high 
 energies.<br/><br/></p><p data-block-key="6ub51">The Ring Imaging Cherenko
 v Detector (RICH) is the AMS subdetector responsible for high-precision ve
 locity measurements in the upper energy range. Improving its velocity reso
 lution is therefore essential to extending AMS sensitivity to isotopic ide
 ntification in previously unexplored energy domains.<br/><br/></p><p data-
 block-key="l0na">The RICH determines particle velocities by reconstructing
  Cherenkov ring patterns produced as particles traverse one of its radiato
 r materials\, aerogel or sodium fluoride.</p><p data-block-key="atst9">Thi
 s work reports possible improvements to the velocity reconstruction perfor
 med by the LIP likelihood-based algorithm.<br/><br/></p><p data-block-key=
 "9j9qo">One enhancement involves exploiting Cherenkov photons emitted from
  the plastic foil support below the radiator. Jointly reconstructing the r
 ings from both the foil and the radiator is expected to improve velocity r
 esolution for high-charge particles.<br/><br/></p><p data-block-key="ht20"
 >A second improvement addresses time-dependent biases in reconstructed vel
 ocities. Periodicities of 60 days and one year\, linked to the temperature
  dependence of radiator refractive indices\, and a long-term drift from li
 ght guide and aerogel ageing are identified. Modeling these effects enable
 s time- and temperature-dependent corrections to the refractive index and 
 emission point used in reconstruction.</p>
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