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SUMMARY:Evaluation of the Influence of the Beam Pipe on the Accuracy of So
 lving the Problem of Determining the Coordinates of Au-Au Interactions
DTSTART;VALUE=DATE-TIME:20241022T140500Z
DTEND;VALUE=DATE-TIME:20241022T160000Z
DTSTAMP;VALUE=DATE-TIME:20260423T040223Z
UID:indico-contribution-4233@cern.ch
DESCRIPTION:Speakers: Mikhail Zharov (SPbSU)\nThe experimental setup for t
 he MPD collider at NICA\, currently under construction at JINR [1]\, is pl
 anned to study the fundamental properties of matter in heavy-ion collision
 s at energies up to 11 GeV/nucleon. \nThis work focuses on the problem of 
 determining the initial coordinates of Au-Au interactions at a system of c
 enter-of-mass energy of 7 GeV/nucleon and the impact of different beam pip
 e configurations on the accuracy of this determination. The approach used 
 is based on the works [2]\, [3]. The UrQMD 3.4 event generator [4] was use
 d for simulating interactions. The obtained results were then imported int
 o a program implemented with Geant4 via the chromo interface [5]. These re
 sults were used to train a neural network model for solving the problem of
  determining the initial coordinates of ions. \nFour scenarios were consid
 ered: with beam pipe wall thicknesses of 1.2\, 3\, 5\, and 8 mm\, and mate
 rials of carbon or iron. The detection areas were located 4 meters from th
 e interaction point and consisted of rings with a diameter of 600 mm. The 
 accuracy of the coordinate determination was measured using the square roo
 t of the mean square error (MSE). \nWe found that using an beam pipe with 
 a thickness of 1 - 3 mm does not significantly affect the result and allow
 ed us\, for example\, to achieve a precision for a carbon beam pipe with a
  thickness of 1.2 mm of √ 𝑀𝑆𝐸 ≈ 3.82 cm. \nFurther increasing
  the thickness of the beam pipe decreases the accuracy of the solution. Fo
 r an iron beam pipe with a thickness of 8 mm the inaccuracy increases to 
 √ 𝑀𝑆𝐸 ≈ 6.30 cm. \nThe work was supported by a grant from Sai
 nt Petersburg State University ID 95413904\n\nReferences\n\n[1] Abraamyan 
 K. U. et al. «The MPD detector at the NICA heavy-ion collider at\nJINR» 
 // Nuclear Instruments and Methods in Physics Research Section A: Accelera
 tors\, Spectrometers\, Detectors and Associated Equipment\, 2011\, v. 628\
 , No 1\, p. 99-102.\n\n[2] V. S. Sandul \, G. A. Feofilov F. F. Valiev. «
 Studying Capabilities of a Fast Monitor for Beam Collisions by Monte Carlo
  Simulations and Machine Learning Methods» // Phys. At. Nucl.\, v. 54 (20
 23)\, p. 712-716.\n\n[3] K.A. Galaktionov\, V.A. Roudnev\, F.F. Valiev. «
 Artificial Neural Networks Application in Estimating the Impact Parameter 
 in Heavy Ion Collisions Using the Microchannel Plate Detector Data: Physic
 s of Atomic Nuclei» // Phys. At. Nucl.\, v. 86\, i. 6 (2023)\, p. 1426- 1
 432\n\n[4] Bleicher\, M. and others. «Relativistic hadron hadron collisio
 ns in the ultrarelativistic quan- tum molecular dynamics model» // J.Phys
 . G 25 (1999)\, p. 1859-1896\n\n[5] GitHub Repository\nUrl: https://github
 .com/impy-project/chromo\n\nhttps://indico.particle.mephi.ru/event/436/con
 tributions/4233/
LOCATION: Alexeevskiy hall
URL:https://indico.particle.mephi.ru/event/436/contributions/4233/
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