arXiv subjects

Dmitry Varentsov

Publications and source records attributed to Dmitry Varentsov.

3 recordsLinked to original sources

arXiv2026

LADA: A differential algebra-based simulation package for arbitrary-order charged-particle and light optics

LADA computes charged-particle and light-optical transfer maps by differential algebra in Python, with run-time order selection validated through order nine. It combines these established map methods with ATIMA-based stopping, straggling and scattering, the GLOBAL, CHARGE and ETACHA charge-state models, EPAX fragmentation, six-dimensional integration through measured or computed RF fields with reference-energy rebasing, and section-wise particle tracking with aperture and RF-window losses. Maps retain analytic dependence on external parameters; contraction with input moments gives beam observables and their sensitivities without particle tracking at each setting. Lattice import from COSY, MAD-X, Xsuite and MIRKO provides per-record status and comparisons with available codes. NumPy is the only required dependency. On the HHT benchmark, the optional compiled DA kernel on eight cores matches COSY in performance at orders 3 and 5 and is 1.8 and 2.9 times faster at orders 7 and 9. Applications include the SIBAF irradiation facility through CALINA, proton microscopy and beam-line studies at GSI and FAIR.

physics.acc-ph↗

arXiv2026

Experimental verification of the PRIORA Monte Carlo code for proton radiography

PRIORA (Proton Radiography Ion-Optical Ray-tracing Analysis) is a fast Monte Carlo model for high-energy proton radiography. It combines fitted proton-matter interaction tables with energy-dependent transfer maps of arbitrary order and simulates approximately $10^6$ protons/s through a complete ion-optical system on an 8-core laptop. We verify it with GSI data obtained with the Ta_bench target: fifteen precision slits in a 2 mm Ta plate between symmetric PMMA staircases. A single experimental image provides the image scale, spatial resolution as a function of chromatic load, the direction of longitudinal defocus in both transverse planes, effective angular acceptance and multiple-scattering contrast. With identical processing of experiment and simulation and no physics adjustment, PRIORA reproduces the data obtained with 2 and 4 GeV protons. At 2 GeV, PRIORA also recovers sub-percent quadrupole trims consistent with the control-system records and determines a target-plane spatial resolution of $115\pm6\,μ$m.

physics.plasm-ph↗

arXiv2026

Proton Radiography with Isotrajectory Optics

We consider a compact isotrajectory-optics scheme for proton radiography. The calculation uses a 30-60 MeV proton interval as a reference example, typical of high-energy short-pulse laser acceleration in the TNSA regime. The idea is to use synchronized time-dependent fields such that, for one selected energy-arrival-time branch, the proton energy changes mainly the arrival time and not the transverse image position. The reference lattice consists of four pulsed electric quadrupoles with horizontal sign pattern + - + -, magnification Mx = My = -3.0 at a detector plane of 2.57 m, a common Fourier plane at zF = 0.962 m, and equal outer and equal inner lens lengths. The ideal closure residual is calculated from second central moments. Fourth central moments are kept separately as a diagnostic of non-Gaussian tails. The quoted residual widths are numerical closure tests of the ideal map, not experimental resolution predictions. Real electrode fields, waveform errors, scattering, detector blur, and space charge define the next level of the problem.

physics.plasm-ph↗