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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:20260906T165223Z
UID:124f2471-b277-4b59-93d0-de06a88dc419
SEQUENCE:1
CREATED:20251114T143005Z
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 v
 elocities by reconstructing Cherenkov ring patterns produced as particles 
 traverse one of its radiator materials\, aerogel or sodium fluoride.This w
 ork reports possible improvements to the velocity reconstruction performed
  by the LIP likelihood-based algorithm. One enhancement involves exploitin
 g Cherenkov photons emitted from the plastic foil support below the radiat
 or. Jointly reconstructing the rings from both the foil and the radiator i
 s expected to improve velocity resolution for high-charge particles.A seco
 nd improvement addresses time-dependent biases in reconstructed velocities
 . Periodicities of 60 days and one year\, linked to the temperature depend
 ence of radiator refractive indices\, and a long-term drift from light gui
 de and aerogel ageing are identified. Modeling these effects enables time-
  and temperature-dependent corrections to the refractive index and emissio
 n point used in reconstruction.
LAST-MODIFIED:20251114T143005Z
LOCATION:Online
URL:http://df.vps.tecnico.ulisboa.pt/en/events/studies-on-the-rich-velocit
 y-reconstruction-with-a-likelihood-approach-features-and-variability-corre
 ctions/
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 reconstructin
 g Cherenkov ring patterns produced as particles traverse one of its radiat
 or materials\, aerogel or sodium fluoride.</p><p data-block-key="atst9">Th
 is work reports possible improvements to the velocity reconstruction perfo
 rmed by the LIP likelihood-based algorithm. <br/><br/></p><p data-block-ke
 y="9j9qo">One enhancement involves exploiting Cherenkov photons emitted fr
 om 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.<br/><br/></p><p data-block-key="ht2
 0">A second improvement addresses time-dependent biases in reconstructed v
 elocities. Periodicities of 60 days and one year\, linked to the temperatu
 re dependence of radiator refractive indices\, and a long-term drift from 
 light guide and aerogel ageing are identified. Modeling these effects enab
 les time- and temperature-dependent corrections to the refractive index an
 d emission point used in reconstruction.</p>
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