Quantum Beam Science

16 pages, 6887 KiB

Open AccessArticle

A Solar-Rechargeable Radiation Dosimeter Design for Radiation Hazard Zone Located with LoRa Network

by Cheng-Yan Guo, Tzu-Lu Lin and Tung-Li Hsieh

Quantum Beam Sci. 2022, 6(3), 27; https://doi.org/10.3390/qubs6030027 - 19 Sep 2022

Cited by 3 | Viewed by 3181

Since the nuclear energy leakage that occurred at the Fukushima nuclear power plant in Japan, people have paid more attention to the danger of environmental radiation. Environmental radiation is monitored using Geiger counters, which are not easy to obtain in some areas. Therefore, this research proposes an open-source and low-cost handheld Geiger counter that uses solar energy to charge lithium-ion batteries. Our design can provide a low-cost environmental radiation monitoring platform and effectively enhance the public’s scientific education awareness of radiation hazards. The measured dose rate can be output through the serial port, allowing a LoRa wireless network to transmit data to a database. When the sensing network deployed by the radiometer detects that the radiation value of the area is abnormally increased, it can issue an alarm to the government for the first time. Moreover, the low-power radiometer design can reduce energy consumption, reduce the burden on the ecological environment caused by the deployment of the sensing network, and provide sustainability for the environment. Full article

(This article belongs to the Special Issue Quantum Beam Science: Feature Papers 2022)

► Show Figures

Figure 1

11 pages, 15590 KiB

Open AccessArticle

Transmission Bender as an Analyzer Device for MIEZE

by Johanna K. Jochum, Jos F. K. Cooper, Lukas M. Vogl, Peter Link, Olaf Soltwedel, Peter Böni, Christian Pfleiderer and Christian Franz

Quantum Beam Sci. 2022, 6(3), 26; https://doi.org/10.3390/qubs6030026 - 2 Aug 2022

Cited by 2 | Viewed by 2677

Abstract

MIEZE (Modulation of IntEnsity with Zero Effort) spectroscopy is a high-resolution spin echo technique optimized for the study of magnetic samples and samples under depolarizing conditions. It requires a polarization analyzer in between spin flippers and the sample position. For this, the device needs to be compact and insensitive to stray fields from large magnetic fields at the sample position. For MIEZE, in small angle scattering geometry, it is further essential that the analyzer does not affect the beam profile, divergence, or trajectory. Here, we compare different polarization analyzers for MIEZE and show the performance of the final design, a transmission bender, which we compare to McStas simulations. Commissioning experiments have uncovered spurious scattering in the scattering profile of the bender, which most likely originates from double Bragg scattering in bent silicon. Full article

(This article belongs to the Special Issue New Trends in Neutron Instrumentation, 2nd Edition)

► Show Figures

Figure 1

15 pages, 3928 KiB

Open AccessArticle

Further Optimized Design of a Nested Rotate Sextupole Permanent Magnet Lens for the Focusing of Pulsed Neutrons

by Taisen Zuo, Zhanjiang Lu, Changdong Deng, Songwen Xiao, Yongcheng He, Zhenqiang He, Xiong Lin, Changli Ma, Zehua Han and He Cheng

Quantum Beam Sci. 2022, 6(3), 25; https://doi.org/10.3390/qubs6030025 - 26 Jul 2022

Cited by 2 | Viewed by 2079

Abstract

A compact nested rotate sextupole permanent magnet (Nest-Rot-SPM) lens was designed for the focusing of pulsed neutrons. It is based on the working conditions of the Very Small Angle Neutron Scattering (VSANS) instrument at the China Spallation Neutron Source (CSNS), and is expected to focus a neutron pulse from 6 Å to 10.5 Å, without chromatic aberration. Three hurdles must be addressed, i.e., the tremendous torque, the heat deposition, and the synchronization with the neutron pulse, respectively. The bore diameter and segment length of the lens are optimized using a formula analysis of the key parameters and model simulations of the torque and heat deposition. A twin torque canceling design is used to reduce the torque to one-third of its original value, or even lower. The goal of this project is to take the device into practical use in the VSANS at the CSNS. Full article

(This article belongs to the Special Issue New Trends in Neutron Instrumentation, 2nd Edition)

► Show Figures

Figure 1

11 pages, 41628 KiB

Open AccessArticle

Blue Diode Laser Welding of Commercially Pure Titanium Foils

by Tim Pasang, Pai-Chen Lin, Wojciech Z. Misiolek, Jia-Yuan Wei, Shinichiro Masuno, Masahiro Tsukamoto, Eiji Hori, Yuji Sato, Yuan Tao, Danang Yudhistiro and Salahuddin Yunus

Quantum Beam Sci. 2022, 6(3), 24; https://doi.org/10.3390/qubs6030024 - 18 Jul 2022

Cited by 5 | Viewed by 3385

Abstract

The need for thin foil welding is increasing significantly, particularly in the electronic industries. The technologies that are currently available limit the joining processes in terms of materials and their geometries. In this paper, a series of trials of fusion welding (bead-on- plate) of commercially pure titanium (CPTi) foils were conducted using a blue diode laser (BDL) welding method. The power used was 50 W and 100 W for 0.1 mm and 0.2 mm thick foils, respectively. Following welding, various samples were prepared to examine the weld profiles, microstructures, hardness, tensile strength, and fracture surface characteristics. The results showed that the base metal (BM) had an annealed microstructure with equiaxed grains, while the weld zones contained martensite (α’) with large grains. The hardness increased in both regions, from around 123 HV to around 250 HV, in the heat-affected zone (HAZ) and fusion zone (FZ) areas. The tensile tests revealed that the strengths of the welded samples were slightly lower than the unwelded samples, i.e., UTS = 300–350 MPa compared with 325–390 MPa for the unwelded samples. Fracture took place within the BM area. All of the samples, welded and unwelded, showed identical fracture mechanisms, i.e., microvoid coalescence or ductile fracture. The weld zone experienced very small strains (elongation) at fracture, which indicates a good weld quality. Full article

(This article belongs to the Special Issue Laser Assisted Manufacturing)

► Show Figures

Figure 1

13 pages, 2981 KiB

Open AccessArticle

Laser Cleaning as Novel Approach to Preservation of Historical Books and Documents on a Paper Basis

by Vadim Parfenov, Alexander Galushkin, Tatiana Tkachenko and Vladimir Aseev

Quantum Beam Sci. 2022, 6(3), 23; https://doi.org/10.3390/qubs6030023 - 30 Jun 2022

Cited by 5 | Viewed by 2913

Abstract

The purpose of this work is the study of laser cleaning of historical paper. The effect of laser exposure of the paper reflectance, fracture resistance and acidity was investigated. The paper surface roughness before and after laser treatment was analyzed by optical and scanning electron microscopy. It was shown that use of multi-pulse micromachining in combination with high-speed scanning of laser beams provides high safety for paper cleaning. The optimal parameters of laser radiation for effective and safe cleaning are a power density of about 2 × 105 W/cm² at a wavelength of 1.06 μm, pulse repetition rate is 20 kHz; and a beam scanning speed of 200 mm/s–500 mm/s. The selective laser cleaning method for books and documents was proposed. Selective cleaning is achieved by means of high-precision control of the trajectory of movement of laser beams. Full article

(This article belongs to the Special Issue Laser Assisted Manufacturing)

► Show Figures

Figure 1

Journal Menu

Journal Browser

Quantum Beam Sci., Volume 6, Issue 3 (September 2022) – 5 articles

Further Information

Guidelines

MDPI Initiatives

Follow MDPI