Browsing by Author "Paran, Nejdet"

Now showing 1 - 3 of 3

High-energy cosmic and gamma radiation measurement with remote-controlled secondary emission ionization calorimetry modules
(Abdullah Gül Üniversitesi, Fen Bilimleri Enstitüsü, 2024) Paran, Nejdet; AGÜ, Fen Bilimleri Enstitüsü, Elektrik ve Bilgisayar Mühendisliği Ana Bilim Dalı
The demand for precise, robust, and reliable radiation-resistant particle detectors and ionization calorimeters intensifies, due to the escalating luminosity and unprecedented radiation conditions at particle colliders and accelerators. Secondary Emission (SE) Ionization Calorimetry is a novel technology designed to measure the energy of electromagnetic and hadronic particles, particularly in extreme radiation conditions. In this study, we have tested and investigated the development and radiation test of the novel SE modules. The modules were developed by modifying the conventional Hamamatsu single anode R7761 Photomultiplier Tubes. Three different voltage conditions for the same module were developed and the new modules were tested by using cosmic, gamma (Co-60) and neutron (AmBe) radiation sources. The results show that all three modes have good sensitivity to electromagnetic showers, and they are suitable for harsh radiation environments. This study also shows that SE module is a promising technology shedding light on future radiation-resistant nuclear and high-energy detectors. Here, we discuss the technical design, test characteristics and cosmic and particle interaction results of the newly developed SE modules. Since such detector systems are either in a high radiation area or in a closed room/box, remote mode changes allow us to continue the experimental process without interruption. By adding these signals to the interface where the modes are controlled, we can instantaneously observe the modes' effects.
Key role of high-T-c twinned martensitic materials to gain a magnetic actuation higher than 15%
(ELSEVIER SCIENCE SAPO BOX 564, 1001 LAUSANNE, SWITZERLAND, 2021) Sarli, Numan; Paran, Nejdet; Ablay, Gunyaz; Ocak, Hamza Y.; Yildiz, Yasin G.; Yildiz, Gokcen D.; Yagci, Nermin K.; AGÜ, Mühendislik Fakültesi, Elektrik - Elektronik Mühendisliği Bölümü; Paran, Nejdet; Ablay, Gunyaz
Twinning angle outcomes of the twinned martensitic (TM) and detwinned martensitic (DTM) structural transformations on the magnetic features of the austenite (A) parent phase are researched by using the effective field theory established by Kaneyoshi. The implementation of the effective field theory verifies that the shape memory mechanism occurs with phase transformations, A -> TM -> DTM -> A. It also shows that the austenite parent phase has two types of actuations: one-dimensional actuation (in only y-axis) for TM, and two-dimensional actuation (in x and y-axes) for DTM. Magnetic field-induced actuation (strain) in the range of 5-15% at twinning angle theta >= 120.816 degrees of TM and DTM is reported for some materials in the literature. On the other hand, in this work, it is estimated that a twinning angle lower than this twinning angle (i.e., theta < 120.816 degrees) must be achieved to have a strain higher than 15%. We also suggest that materials with higher magnetization, Curie temperature, coercive field and remanence magnetization should be taken into account to get a strain higher than 15%, since all these features are directly affected by the twinning angle (theta). Our results on Curie temperature (T-c) match with the experimental results of Ni49.8Mn28.5Ga21.7 (achieved 6% strain) with T-c = 95 degrees C (368 K) by Murray et al., and Ni46Mn24Ga22Co4Cu4 with T-c = 393 K (achieved 12% strain) by Sozinov et al. (C) 2021 Elsevier B.V. All rights reserved.
Nonequilibrium phase diagrams in a multilayer Ising ferrimagnet system: The Glauber type stochastic dynamics approach
(ELSEVIER, 2024) Paran, Nejdet; Ertaş, Mehmet; 0000-0003-0317-0438; AGÜ, Mühendislik Fakültesi, Elektrik - Elektronik Mühendisliği Bölümü; Paran, Nejdet
Multilayer Ising ferrimagnet system is studied with nonequilibrium phase diagrams employing the Glauber stochastic dynamics approach. Firstly, nonequilibrium phase transition temperatures and their phase transition nature are investigated in detail. The study shows that the system displays both the second and first-phase transition behaviors. Then, it is determined that the essential phases of nonequilibrium phase diagrams consist of five phases (i1, i2, nm1, nm2, p), four mixed phases (i1+ p, nm1 +nm2, nm2 + p, i1 + nm2), and four special points (A, B, E, TP). Lastly, the study demonstrates that the dynamic magnetic characteristics of the system exhibit a significant dependence on the parameters of the Hamiltonian.