Recovery of Film Information Processing (FIP) of bubble chambers / Refinement of optical constants / Polynomial approximation of the magnetic field / Kinematic fitting

Seminars

VBLHEP Specialised Seminar

A. M. Baldin Relativistic nuclear physics and polarisation phenomena #808

Date and Time: Wednesday, 12 April 2023, at 11:00 AM

Venue: VBLHEP Conference Hall (bld. 3), the Veksler and Baldin Laboratory of High Energy Physics, online on Volna

Join the seminar

  1. Seminar topic: “Recovery of Film Information Processing (FIP) of bubble chambers”

    Speaker: Alexander Belyaev

    Authors: Anton Baldin, Alexander Belyaev, Alexey Beloborodov, Victor Rikhvitsky, Alexander Troyan

    Abstract:

    On a new basis, the complex for the processing of film information (FIP), obtained on bubble chambers, has been restored. Added the ability to measure the specific blackening of track sections. Implemented for photographs of 1-meter hydrogen and 2-meter propane chambers which were obtained in the measurement sessions of the 1960-2000s at JINR.

  2. Seminar topic: “Refinement of optical constants”

    Speaker: Alexander Belyaev

    Authors: Alexander Belyaev, Victor Rikhvitsky

    Abstract:

    When reconstructing the FIP significant inaccuracies were found in the chamber optical constants. The algorithm that refines the optical constants is implemented.

  3. Seminar topic: “Polynomial approximation of the magnetic field”

    Speaker: Alexander Belyaev

    Authors: Alexander Belyaev, Victor Rikhvitsky

    Abstract:

    To calculate the magnetic field at arbitrary points a linear interpolation of previously made field measurements is often used. The field is approximated by polynomials satisfying the Laplace equation ∇2U = 0, where U is a scalar potential.

    The approximation can be applied not only to bubble chambers (where the field is stationary and close to uniform), but also to other track detectors whose field has a scalar potential.

  4. Seminar topic: “Kinematic fitting”

    Speaker: Alexander Belyaev

    Authors: Alexander Belyaev, Victor Rikhvitsky

    Abstract:

    The procedure of kinematic fitting for the restored FIP is presented. The algorithm for finding the initial values of the kinematic parameters of particles has been improved, as a result of which their refinement by solving the equations of motion has become redundant.