The Facility for Rare Isotope Beams (FRIB) is designed to accelerate ion beams to ≥ 200 MeV per nucleon with 46 superconducting radio-frequency cryomodules. The FRIB driver linac uses quarter-wave resonators and half-wave resonators; with a total of 324 resonators, the linac is currently the largest heavy ion accelerator in the world. Production of jacketed resonators began in January 2014 and was

The existing photofission product yield data sets are often based on nuclear models, and limited experimental measurements of these fission product yields have been performed. These experiments resulted in measured cumulative fission product yields (CFPYs) for 238U and 232Th for the bremsstrahlung X-ray endpoint energies of 8, 14, and 20 MeV. The half-lives of the reported fission products range from

In order to demonstrate acceleration of electrons to relativistic scales by an on chip dielectric laser accelerator (DLA), a ponderomotive focusing scheme capable of capturing and transporting electrons through nanometer-scale apertures over extended interaction lengths has been proposed. We present a Matlab-based numerical code (SHarD) utilizing a spatial harmonic expansion of the fields within the

CAPP-8TB is an axion dark matter search experiment dedicated to an axion mass search near 6.7 μeV. The experiment uses a microwave resonant cavity under a strong magnetic field of 8 T produced by a superconducting solenoid magnet in a dilution refrigerator. We describe the experimental configuration used to search for a mass range of 6.62 to 6.82 μeV in the first phase of the experiment. We also discuss

Organic glass scintillator (OGS) bars (6 × 6 × 50 mm3) were melt-cast and characterized with dual-ended readout by silicon photomultiplier arrays. The results were compared to trans-stilbene bars of the same size. Energy resolution was measured via a 137Cs Compton-coincidence experiment. Time resolution was determined via a 22Na coincidence-timing experiment. Depth-of-interaction resolution was measured

The Japan Atomic Energy Agency (JAEA) is collaborating with the European Commission Joint Research Centre (EC/JRC) to develop delayed gamma-ray spectroscopy (DGS). Toward this, the JAEA Integrated Support Center for Nuclear Nonproliferation and Nuclear Security (ISCN) designed the Delayed Gamma-ray Test Spectrometer (DGTS) that uses a 252Cf source (DGTS-C). This instrument is used to refine the design

In this study, a method based on a deep stacking network is proposed to solve the signal separation problem of dynamic dual-tracer PET. The advantage of this method is that it avoids requirements for prior information of tracers, and a staggered injection. The proposed model is pre-trained with restricted Boltzmann machines and fine-tuned in a manner, which the output of the last training epoch was

The Back-n facility at the China Spallation Neutron Source (CSNS Back-n facility) is a newly-built time-of-flight (TOF) spectrometer for neutron nuclear data measurements. The Energy Resolution Function (ERF) of a neutron spectrometer is essential for the analysis of the data measured on the facility, especially in the resolved energy region, as the ERF represents the intrinsic broadening effect of

The electron attachment is studied using a Frisch-grid ionization chamber (GIC) with different number densities of O2 in the working gas and different reduced electric fields. The influence of the electron attachment on the cathode–anode two-dimensional amplitude spectrum of the GIC is measured and evaluated. The method of measuring the attachment probability per unit time using the GIC is established

The measurement of low-level Krypton-85 (85Kr) in low-volume influent samples from nuclear power station is required nowadays. We present the development of an original internal gas scintillator detector along with Low-level Automated 85Kr Analyzing System (LAKAS) for that purpose. The designed phoswich detector is consist of a thin BC404 cell in the inner side for the detection of 85Kr beta rays,

In view of the demand for high-energy and high-bandwidth signal detection in X-ray communication (XCOM) during spacecraft reentry blackout, a detection module using fast-decay LYSO scintillator coupled with Silicon photomultiplier (SiPM) was proposed in this study. The theoretical model based on the Monte Carlo simulation and Personick’ theory was established and the detector prototype was built. Moreover

A new electromagnetic calorimeter consisting of 140 lead tungstate (PbWO4) scintillating crystals was constructed for the PrimEx-η experiment at Jefferson lab. The calorimeter was integrated into the data acquisition and trigger systems of the GlueX detector and used in the experiment to reconstruct Compton scattering events. The experiment started collecting data in the spring of 2019 and acquired

The Advanced Continuous-wave Electron injector aims to provide accelerator-based light sources with a high repetition rate and high average current electron beam. The injector consists of a DC thermionic gun generating a continuous electron beam, after which a radio-frequency (rf) cavity operating in dual mode at 1.5 and 3 GHz deflects the beam onto a knife-edge, creating a pulsed beam. A final rf

The light output response and efficiency of 5”×5” BC501A liquid scintillator neutron detectors composing the NAND detector array have been measured by time of flight technique using 252Cf source. Energy dependent detection efficiency was calculated using FLUKA Monte Carlo code and validated by experimental measurement. FLUKA simulation incorporated fission neutron correlation and kinematics of neutron

The influence of pre-exposure thermal annealing on CR-39 etch rates has been studied here thoroughly. Annealing experiments were conducted on CR-39 detectors prior to their exposure to 252Cf fission fragment source. The bulk etch rates were measured by using the weight loss method (WLM) and the fission track diameter method (FTDM). We report here a new quantitative result that the bulk etch rate decreases

The systems for monitoring mildly radioactive air emissions from the ISIS Spallation Neutron and Muon Source are described. The systems use Geiger tubes to measure beta activity (both β– and β+) sampled from stacks discharging air to the atmosphere, and whilst they are relatively simple systems, they have proved themselves very reliable over the thirty-six years since ISIS began operations. Calculations

Using the conventional coil manufacturing method, the iron core of a small aperture quadrupole magnet needs to be divided into four or more segments to install the excitation coils, which brings assembly errors and generates high-order magnetic field harmonics. In this paper, the development of a high-precision small-aperture quadrupole magnet named HQ22 using copper plate coils is described. The magnet

An advanced neutron beam collimation system has been developed as part of an effort to optimize neutron beam transport at the Weapons Neutron Research (WNR) Facility [1], located within the Los Alamos Neutron Science Center (LANSCE). The goal of this work was to develop and demonstrate techniques to tailor neutron delivery in order to provide maximum available flux on sample with a specific beam profile

On 26 January 2021, the neutron beam shutter for the multi-physics instrument (MPI) at the China Spallation Neutron Source was opened for the first time. The MPI is the first total scattering diffractometer in China. Initial measurements to characterize the instrument performance are reported in this paper. The measurement results well agree with the design calculations. New scientific opportunities

To monitor the irradiation dose and position accurately delivered to patient during particle therapy in Heavy-Ion Cancer Therapy Device (HICTD) in Lanzhou, China, an In-Beam Positron Emission Tomography (PET) has been designed as a detection device to obtain time, energy and position information of gamma ray generated from the annihilation event, which is equipped at the beam line of HICTD. Sixteen

The detection of trace elements of silver in refined copper based on the portable energy dispersive x-ray fluorescence spectrometer was disturbed severely by pulse pile-up, so quantitative analysis had a high method detection limit and low accuracy. A new approach was provided to reduce the appearance of the pulse pile-up and lower the detection limit. A robust quantitative model was established. The

In order to accommodate the luminosity improvement strategy, two superconducting 499.8 MHz radio frequency (rf) cavities have been adopted for the Upgrade project of Beijing Electron Positron Collider (BEPCII), a double-ring electron–positron collider as well as a synchrotron radiation (SR) light source. The in-house development of the 499.8 MHz superconducting cavity system was initiated at IHEP since

A large scale 3D reconstruction using a combination of 2D transmission muography projections is presented. This reconstruction is based on the implementation of the SART algorithm used in medical imaging and recently applied to small objects in the absorption mode. Several challenges had to be faced, in particular the lack of open-sky (total flux) measurements during the transmission data taking, the

This paper presents the RF design, thermal calculations and beam dynamics simulations of a compact, high repetition rate, travelling-wave RF photogun operating at the European X-band frequency of 11.994 GHz. The design is based on a CLIC prototype structure milled from copper halves and proposes to use the unique gap, introduced in the original X-band accelerating structure’s geometry, to couple in

Two types of wedge-shaped CsI(Tl) crystals were designed to be placed behind an annular double-sided silicon detector to identify light charged-particles with the ΔE−E method. The properties of the CsI(Tl) detectors with different shapes and sizes were investigated using an α source and a radioactive beam of 15C. The larger crystal was found to have better energy resolution, smaller light output non-uniformity

The GRIT (Granularity, Resolution, Identification, Transparency) Silicon array is intended to measure direct reactions. Its design is based on several layers (three layers in the forward direction, two backward) of custom-made trapezoidal and square detectors. The first stage is 500 μm thick and features 128 × 128 orthogonal strips. Pulse shape analysis for particle identification is implemented for

An imaging beam line, Energy-Resolved Neutron Imaging instrument (ERNI) is under construction at China Spallation Neutron Source (CSNS). Here we describe the design of its bandwidth chopper system, such as the operation modes and the determination of the chopper parameters by theoretical calculations. The Monte Carlo simulations using McStas are performed to check the design of the bandwidth choppers

Additively manufactured scattered beam collimators are increasingly being employed to boost the sample to cell peak signal ratio in high pressure neutron diffraction studies because of manufacturing versatility and performance improvements. We study how the measured diffraction pattern is affected by the presence of a collimator downstream of the sample, and develop a novel protocol that provides more

There are a large number of soft X-ray grating monochromators for high-resolution synchrotron radiation experiments in operation worldwide. At BESSY II eighteen of the monochromators currently in use are equipped with Heidenhain UHV RON905 angle encoders. Those angle encoders have successfully been in operation for decades. Today, this type of encoder has become a legacy product and repairs are getting

For modern high-intensity linear accelerators, the well-known envelope instability and recently reported fourth-order particle resonance impose a fundamental operational limit (i.e., zero-current phase advance should be less than 90°). Motivated by the stability of spinning flying objects, we propose a novel approach of using spinning beams to surpass this limit. We discovered that spinning beams have

A cryogenic supersonic gas jet target was developed for the MAGIX experiment at the high-intensity electron accelerator MESA. It will be operated as an internal, windowless target in the energy-recovering recirculation arc of the accelerator with different target gases, e.g., hydrogen, deuterium, helium, oxygen, argon, or xenon. Detailed studies have been carried out at the existing A1 multi-spectrometer

The paper demonstrates that temporal behavior of proton components of intense pulsed ion beams accelerated to average energy of up to 200 keV with number of 1015 per shot can be reliably evaluated with use of prompt γ-spectrometry. The ion shots are dumped onto a pyrolytic h-BN plate in which a 5 mm diameter hole is provided to enable simultaneous time-of-flight measurement of the ion species with

CSES (China Seismo-Electromagnetic Satellite) is a Chinese-Italian scientific space mission dedicated to monitor the variations of the main parameters of the topside ionosphere (electric and magnetic fields, plasma parameters, charge particles fluxes) caused by either natural emitters - especially earthquakes - or artificial ones. The CSES satellite was successfully launched from the Jiuquan Satellite

In an in-vacuum undulator, the dynamic phase error, which is a kind of systematic phase errors, is increased because the out-of-vacuum girder is deformed with a strong magnetic force. As a result, the spectral performance of synchrotron radiation is deteriorated. A recommended solution for a problem of this kind is to adopt a spring system to compensate the magnetic force, but a conventional spring

NeuLAND, the New Large Area Neutron Detector, is a key component to investigate the origin of matter in the universe with experimental nuclear physics. It is a core component of the Reactions with Relativistic Radioactive Beams setup at the Facility for Antiproton and Ion Research, Germany. Neutrons emitted from these reactions create a wide range of patterns in NeuLAND. From these patterns, the number

There is a strong demand for accelerating structures able to achieve higher gradients and more compact dimensions for the next generation of linear accelerators for research, industrial and medical applications. Notably innovative technologies will permit compact and affordable advanced accelerators as the linear collider and X-ray free-electron lasers (XFELs) with accelerating gradients over twice

A systematic study is performed to measure the ion backflow fraction of the GEM detectors. The effects of different voltage configurations and Ar/CO2 gas mixtures, in ratios of 70:30, 80:20 and 90:10, on positive ion fraction are investigated in detail. Moreover, a comparative study is performed between single and quadruple GEM detectors. The ion current with detector effective gain is measured with

The Schottky barrier diodes were fabricated from a bulk Sn-doped (001) n-type Ga2O3 substrate with a Si-doped epitaxial layer grown by hydride vapor phase epitaxy (HVPE), which demonstrate a good response to X-rays. Circular metal contacts with diameters ranging from 50 to 1500μm and square metal contacts ranging from 100×100μm2 to 1600×1600μm2 were deposited on the wafer. The devices were characterized

Collinear laser spectroscopy (CLS) has been performed in a multi-reflection time-of-flight (MR-ToF) device operated in single-pass mode, i.e., without confining the ions in the ion trap. While our Multi Ion Reflection Apparatus for Collinear Laser Spectroscopy (MIRACLS) aims to increase the CLS sensitivity by storing ions in the MR-ToF device, the present work characterises conventional single-passage

In this study, we propose a phase correction method for a type of neutron spin echo spectroscopy, known as modulation of intensity with zero effort using a time-of-flight method (TOF-MIEZE). The phase of the MIEZE signal sensitively varies with the neutron flight path lengths. The geometrical lengths from the sample position to the flat detector plane differ depending on the positions on the detector

Cavity Beam Position Monitor (CBPM) adopting a resonant cavity structure and using the characteristic modes excited by the electron beam to measure the beam parameters, has the advantage of high position resolution and is widely used in Free-electron Laser (FEL) facilities. The wake field of different modes carries different bunch information, the amplitude and phase of the signals of different modes

The STAR experiment has been delivering significant physics results for more than 20 years. Stable operation of the experiment was achieved by using a robust controls system based on the Experimental Physics and Industrial Control System (EPICS). Now an object-oriented approach with Python libraries, adapted for EPICS software, is going to replace the procedural-based EPICS C libraries previously used

The PIPS-SrI2(Eu) is a prototype atmospheric radioxenon detection system designed at Oregon State University in support of international efforts towards monitoring clandestine nuclear weapon testing activities. This detector aims to address some shortcomings found in currently deployed beta-gamma atmospheric radioxenon detection systems, such as lackluster energy resolution and memory effect, by employing

An ultrafast electron diffraction (UED) facility is located at Shanghai Jiao Tong University. The layout of the UED is divided into two modules. The accelerating module has one S-band photocathode RF gun, one C-band harmonic buncher, and one C-band deflector. The power-generating module has one S-band klystron and one C-band klystron. To meet the high-precision requirements, a MicroTCA.4-based low

We present the conceptual design of a polarized 3He target to be used for high luminosity scattering experiments within high magnetic field environments. This two-cell target will take advantage of advancements in optical pumping techniques at high magnetic field to create 60% longitudinally polarized 3He gas in a pumping cell within a uniform magnetic field above 1 T. By transferring the polarized

Superconducting radio-frequency (SRF) cavities are preferred in many modern accelerator facilities to reduce the operation cost of the RF power systems. SC cavities are usually sensitive to small mechanical perturbations because of their narrow bandwidth. These perturbations such as microphonics and Lorentz force detuning (LFD) can significantly detune the SRF cavity and therefore not only deteriorate

This paper describes an experimental setup developed to measure the beta-ray energy spectrum as well as a Geant4 simulation study conducted to characterize the properties of a beta-spectrometer. The beta-spectrometer comprises a multi-wire chamber to generate signals to indicate the incidence of beta rays and a plastic scintillation detector to measure its energy. The coincidence method of the detector

Potassium-40 (40K) is a long-lived, naturally occurring radioactive isotope. The decay products are prominent backgrounds for many rare event searches, including those involving NaI-based scintillators. 40K also plays a role in geochronological dating techniques. The branching ratio of the electron capture directly to the ground state of 40Ar has never been measured, which can cause difficulty in interpreting

The AGILE (Advanced enerGetic Ion eLectron tElescope) project focuses on the development of a compact low-cost space-based instrument to measure the intensities of charged particles and ions in space. Using multiple layers of fast silicon sensors and custom front-end electronics, the instrument is designed for real-time particle identification of a large variety of elements from H to Fe and spanning

The Cs2LiYCl6 (CLYC) scintillator is proven to be suitable for dual γ-ray/neutron detection owing to its distinct response to both radiation types. This feature makes this material attractive for applications in nuclear security and safeguards. Two 3.8 cm diameter CLYC crystals, one enriched with 95% 6Li, and the second one depleted of 6Li and with >99% 7Li, were characterized with conventional gamma-ray

Among the imaging systems used for thermal neutron imaging worldwide, the most prevalent configuration is CCD camera based. At facilities with sufficiently high neutron flux (>1 × 106 n/cm2/sec), the basic design does not necessitate amplification of scintillation photons prior to their registration by the CCD camera. However, for high resolution imaging at low flux reactors, insufficient amount of

Diagnostics and monitoring of radiological scenes are critical to the field of nuclear safety and here, the localization of radioactive hotspots is mandatory and remains a critical challenge. In order to perform gamma-ray imaging, one main method relies on indirect imaging by means of coded mask aperture associated with a position sensitive gamma-ray detector and a dedicated deconvolution algorithm

Shanghai laser electron gamma source (SLEGS) is an energy-variable gamma-ray source developed based on the inverse Compton scattering of 10640 nm photons from a 100 W CO2 laser on 3.5 GeV electrons from the Shanghai Light Source. It produces gamma-rays in the energy range of 0.4–21.7 MeV with a flux of 105–107 photons/s. A collimator system was designed to produce quasimonochromatic gamma-ray beams

The purpose of this study is to introduce and demonstrate a novel graphical method to determine effective bremsstrahlung focal spot size and shape of the therapeutic beam from a linear accelerator. The energy distribution within the beam spot allows in determining effective bremsstrahlung size and shape of beam spot. The transverse and radial dose profiles were measured for a range of field sizes in

Results from a preliminary accelerator-based experiment conducted at the Harwell Tandem Van de Graaff generator to estimate the thick target integrated over angle yield of 6.129 MeV γ-rays from α-particles in the MeV range stopping in natural carbon are briefly outlined. The results should be useful in planning future detailed experiments to generate data for applications and also to benchmark thin

The light collection of several fiber configurations embedded in a box-shaped plastic scintillating counter was studied by scanning with minimum ionizing electrons. The light was read out by silicon photomultipliers at both ends. The light yield produced by the 855-MeV beam of the Mainz Microtron showed a strong dependence on the transverse distance from the beam position to the fibers. The observations

Reliable bunch length measurement for electron beams is critical for the successful development of high-brightness beam injectors. Compared with commonly used schemes involving complicated techniques and dedicated devices, RF-phasing techniques have advantages in low-energy injectors owing to their convenience and low cost. Although previous direct calculation formulas originating from RF-phasing techniques

An SLAC-like Compact Linac installed on the HUST THz-FEL has been used as an injector to produce high power THz radiation. In order to produce the terahertz radiation with high monochromaticity and repeatability continuously, the beam parameters should be stabilized rigorously. Therefore, by using beam-dynamic calculation and simulation, the stability targets for RF system have been proposed on basis

A Compact Spectrometer for Heavy IoN Experiments (CSHINE) has been recently built for the studies of heavy ion reactions at intermediate energies. CSHINE consists of a Si-Si-CsI telescope array and a parallel plate avalanche counter (PPAC) array. Each telescope consists of a thin single-sided silicon strip detector and a thick double-sided silicon strip detector backed by a 3 × 3 CsI(Tl) crystal hodoscope

A 10 MeV, 3 kW RF electron linear accelerator ( linac )is in operation at EBC, Kharghar. A new horizontal linac rated for 10 MeV, 5 kW has been planned to be developed at EBC, Kharghar. The components of 10 MeV linac beam line consists of electron gun, a standing wave (SW) single cell pre-buncher cavity and a SW main linac cavity of length 0.9 m. In order to enhance the beam capture efficiency and